FR3019941A1 - LIGHT EXTRACTING BRACKET AND OLED DEVICE INCORPORATING SAME - Google Patents

Abstract

The invention relates to a light extracting support (100) comprising: a substrate, transparent (1), with a first face (11) and first light extraction elements (2) disjoint and connected to the first face, in metal material which are nanoparticles or metal nanopalets in a nonmetallic medium (40) or non-metallic nanopartets or nanopalets in a metal medium. The length L1, the thickness E1 and the width W1 are such that the first optical element in the said medium has a scattering cross section which has a resonance at a wavelength λm in the air in a range from 380 to 780nm. For each nanobatonnet, the axis X1 forms with the plane PO of the substrate an angle α of at most 30 ° and for each nanopalet the plane P1 of the nanopalet forms with the plane PO an angle α of at most 30 °.

Description

The invention relates to a light extracting support. It relates more particularly to a light extracting support of an organic light emitting diode device, called "OLED" for "Organic Light Emitting Diodes" in English, as well as the OLED device incorporating it. The OLED comprises a material, or a stack of materials, electroluminescent (s) organic (s), and is framed by two electrodes, one of the electrodes, called lower, usually the anode being associated with the substrate glass and the other electrode, said upper, usually the cathode, being arranged on the organic electroluminescent system. OLED is a device that emits light by electroluminescence using the recombination energy of holes injected from the anode and electrons injected from the cathode. There are different configurations of OLED: - rear emission devices ("bottom emission" in English), that is to say with a lower electrode (semi) transparent and a reflective upper electrode; the front emission devices ("top emission" in English), that is to say with an upper (semi) transparent electrode and a lower reflective electrode; the front and rear emission devices, that is to say with both a lower (semi) transparent electrode and an upper (semi) transparent electrode. The invention relates to backward-transmitting OLED devices and possibly also backward and forward-transmitting OLED devices. An OLED has a low light extraction efficiency: the ratio between the light that actually leaves the glass substrate and that emitted by the electroluminescent materials is relatively small, of the order of 0.25. This phenomenon is partly explained by the fact that a certain amount of photons remains trapped in guided modes between the electrodes. It is therefore sought solutions to improve the efficiency of an OLED, namely to increase the extraction gain. In the patent application WO2009 / 116531, it is proposed to insert between the glass substrate and the electrode an enamel layer having a refractive index greater than 1.7 and incorporating diffusing elements in the form of pores. or micron scattering particles.

To compensate for electrical failures due to the roughness of this layer generated by these particles or pores, it is planned to planarize this light extraction layer by a planarization enamel layer devoid of diffusing elements protruding, and always d refractive index greater than 1.7, so as to cover them by embedding them in this planarization layer.

For good light extraction, the enamel layer must be thick and therefore absorbent. The high index planarization layer is also thick to have a good surface quality, increasing the absorption. The aim of the invention is a light extracting support of an alternative OLED device, particularly suitable for lighting, further improving the extraction of light emitted by said OLED device and even easier to manufacture, this without penalizing its reliability and preferably by reducing the absorption. To this end, the invention firstly proposes a light extracting support (light in the visible radiation sense), in particular light emitted from an organic electroluminescent system (or more broadly from any surface light emitting system generating guided modes). ) comprising: a transparent and dielectric (or at least non-metallic) substrate, preferably a glass substrate, in particular a mineral or organic glass pane, in particular a polymer film, preferably a substrate of refractive index ns of at most 1.65 to 550 nm and preferably in all the range of the visible, with a main face, said first face, - light extraction elements, said optical elements, disjoint, and linked to the first face (including partial integration in the first face), each optical element being in a non-metallic medium which is of refractive index no of at most 3.5 to 550 nm and even at most 2.5 to 5 nm. 50nm better in the entire visible spectrum, medium preferably dielectric. At least a portion of the optical elements, said first optical elements, and preferably the majority and even at least 90% of the optical elements -3- and all, are made of metallic material, three-dimensional, and each have first, second and third nanometric dimensions (perpendicular to each other), the first dimension, called length L1, (preferably average length) being the largest and along an axis X1, the second dimension, called thickness E1, (preferably average thickness) being along an axis Z1 perpendicular to X1 perpendicular to X1 and being the smallest of dimensions perpendicular to X1, the third, said width W1 (preferably mean width), being following an axis Y1 perpendicular to X1 and to Z1, with L1 / E1> 1.5, even L1 / E1> 2, and L1 / E1 <20 and better L1 / E1 <5, better between 2 and 3. Each first optical element being: (a) a nanobond, with El \ / \ / 1 <1.5E1 and L1> W1, or (b) a nanopalet, with W11.5E1, and 0.3L1 <W1L1 (better 0.5L1 <W1L1 and even better 0.8L1 <W1L1), a plane P1 being formed by two vectors i and j respectively parallel to X1 and Y1 and (preferably) passing through a point A of the nanopalet closest to the first face facing the nanopalet, L1, El and W1 of each first optical element being such that each first optical element in said non-metallic medium has an effective cross section which has a resonance at a wavelength λ, in the air in a range from 380 to 780 nm, X being preferably less than 700 nm and even less than 600 nm.

The substrate (the first face) has a plane PO (preferably a local plane, that is to say facing the first optical element), in particular defined by X and Y axes perpendicular to each other - a Z axis being normal in the plane P0, for each nanobaton the axis X1 forms with the plane PO an angle α of at most 30 ° and preferably at most 10 ° and even at most 5 ° or at most 2 ° and - for each nanopalet the plane P1 forms with the plane PO an angle α of at most 30 ° and preferably at most 10 ° and even at most 5 ° or at most 2 °. The first optical elements according to the invention (nanobatonnets and / or nanopalets) have a visible cross-section much higher in resonance than the known dielectric particles and also a more controllable indicator of diffusion in the visible range. .

The shape and the dimensions of these first metallic optical elements make it possible to efficiently extract the guided modes of a source of light like the OLED thanks to their anisotropic diffusion. The orientation of each first optical element according to the invention makes it possible to redirect the light through the substrate.

The invention also proposes a second object, although less preferred to the first object, in particular for the constraints of transparency (and therefore limitation in thickness) of the metallic medium described below. To this end, the invention proposes as a second object a light extracting support (light in the visible radiation sense), in particular light emitted from an organic electroluminescent system (or more broadly from any surface light emitting system generating guided modes). comprising: a transparent and dielectric (or at least non-metallic) substrate, preferably a glass substrate, in particular a mineral or organic glass pane, in particular a polymer film, preferably having a refractive index ns of at most 1, 65 to 550 nm and preferably in the entire range of the visible, with a main face, said first face, - light extraction elements, said optical elements, disjoint, and linked to the first face, each optical element non material metal, preferably dielectric, which has a refractive index of at most 3.5 to 550 nm and even at most 2.5 to 550 nm better in the entire visible spectrum. At least a part of the optical elements, said first optical elements, and preferably the majority and even at least 90% of the optical elements and even all, which each have first, second and third nanometric dimensions (perpendicular to each other), the first dimension, said length L1, (preferably average length) being the largest and along an axis X1, the second dimension, said thickness E1, (preferably average thickness) being along an axis Z1 perpendicular to X1 and being the smallest of the dimensions perpendicular to X1, the third, said width W1 (preferably mean width), being along an axis Y1 perpendicular to X1 and to Z1, with L1 / El> 1.5, even L1 / El> 2 , and L1 / E1 <20 and better L1 / E1 <5, more preferably between 2 and 3. Each first optical element is in a metal medium and being: (a) a nanobond, with E1 / 1 <1.5E1 and L1> W1, or (b) a nanopalet, with W11.5E1, and 0.3L1 <W1L1 (better 0 , 5L1 <W1 and even better 0.8L1 <W1), a plane P1 being formed by two vectors i and j respectively parallel to X1 and Y1 and passing through a point A of the nanopalet closest to the first face next to the nanopalet . L1, E1 and W1 of each first optical element being such that each first optical element in said metal medium has a scattering cross-section which has a resonance at a wavelength λ in the air in a range from 380 to 780 nm, X being preferably less than 700 nm and even less than 600 nm. The substrate (the first face) has a plane PO (preferably a local plane, that is to say facing the first optical element), in particular defined by X and Y axes perpendicular to each other and by a normal Z axis. in the plane P0, for each nanobatonnet the axis X1 forms with the plane PO an angle α of at most 30 ° and preferably at most 10 ° and even at most 5 ° or at most 2 And for each nanopalet the plane P1 forms with the plane PO an angle α of at most 30 ° and preferably at most 10 ° and even at most 5 ° or at most 2 °. Preferably for the first as the second object, the angle a is at most 5 ° or 2 ° for the majority and even at least 90% or all the first optical elements (nanopalets and / or nanobatonnets). X, can be measured as follows for the first object (and similarly for the second object). On the edge of the extractor support and in the region containing the first optical elements, the following optical array is provided: a white source, a monochromator and means coupled to the monochromator for scanning the spectrum of the visible wavelength by wavelength, - an optical injection system in the region containing the first optical elements. A detector is placed perpendicular to the first face above in the region containing the first optical elements on the side of the first face. The detector measures the scattering cross section of a first optical element as a function of the wavelength in the visible spectrum. Once the peak value (maximum) determined, we deduce the associated wavelength Xm (abscissa). For a given first optical element, it is possible to have several distinct Xm and X 'peaks within the scope of the invention. For this measurement of Xm, it is preferred to avoid the presence of the electrode, especially if it is metallic, of the organic electroluminescent system and the second electrode (cathode). For example, an OLED device according to the invention can be stripped with ethanol up to the region containing the first optical elements, for example with a layer covering the optical elements, dielectric or conductive polymer or conductive transparent oxide. Preferably, the first metal optical elements are solid (no hollow core). The first metallic optical element may have a metal core element (solid) coated with one or more metallic metal functional coatings. In a first embodiment, the resonance of one or more optical elements (metallic or non-metallic) according to the invention may be excitable by a planar and progressive electromagnetic wave, monochromatic and of wavelength in the air. XE in the visible spectrum, propagating parallel to the substrate and defined by a magnetic field H polarized parallel to the plane P0 and orthogonal to the direction of propagation which is in the plane P0 and parallel to the orthogonal projection of L1 on the plane P0 . The specific asymmetry of the first metallic (or non-metallic) optical element according to the invention induces a dipole moment substantially parallel to the substrate even under the aforementioned excitation conditions in which the electric field E is substantially orthogonal to the plane PO in the middle.

Under these same conditions, a metallic spherical particle is not suitable because it induces a dipole parallel to the field E (thus essentially Z) radiating essentially in the plane P0. A metallic optical element inducing absorption losses The extraction efficiency is measured by the ratio between the extracted light and the light radiated in the guide. This ratio is much greater with the first optical element according to the invention than that with a metallic spherical particle. X1, Y1 and Z1 are orthogonal axes specific to each first optical element. These axes can be distinct from one optical element to another.

A first nanobarton may have a resonance inducing a pole px along its axis X1 and another nanobarton have a resonance inducing a dipole p'x along its axis X1. It is preferred that the axis X1 of the first stick is separate from the axis X1 of the other nanobond to induce two resonances.

In a preferred embodiment, all or some of the first optical elements (metallic or non-metallic) - and preferably the majority and even at least 90% of the optical elements and even all - are nanopalets, thereby reinforcing the dipoles in the plane PO to have a dipolar resonance along X1 and Y1 excitable by an electric field along X1 and Y1 respectively. The nanopalet has the advantage of having two resonances inducing two px dipoles along X1 and py along Y1. Even more preferably, X1 and Y1 are in the plane PO to maximize the dipoles. The nanopalet (metallic or non-metallic) is longer (and wider) than thick and preferably is a nanocylinder, even a nanodisk, or else is a nanodome. In this first advantageous embodiment, X is measured in the following manner. On the edge of the extractor support and in the region containing the first metallic optical elements (or in a similar non-metallic manner), the following optical bench is provided: a white source, a monochromator and means coupled to the monochromator for scanning the spectrum of the visible wavelength per wavelength, - a polarizer making the magnetic field H polarized parallel to the first face, - an optical injection system in the region containing the first optical elements. We then arrange for the propagation direction to be parallel to the orthogonal projection of L1 on the plane P0.

A detector is placed perpendicular to the first face above in the region containing the first optical elements on the side of the first face. The detector makes it possible to measure the scattering cross section as a function of the wavelength in the visible spectrum. Once the peak (maximum) value has been determined, the associated wavelength X m (abscissa) is deduced therefrom. For a given first optical element, it is possible to have several distinct peaks at X m and X '. The term "non-metallic medium" according to the invention means the surrounding material (including vacuum) which surrounds each first metallic optical element at the scale of the wavelength in the visible range divided by the refractive index no in the visible middle. It can be considered that the thickness of the medium all around the first optical element is at most 150 nm and even at most 100 nm. Preferably, the non-metallic medium is shared by several first metallic optical elements, in other words the majority or even each first optical element, has an identical optical medium, in particular formed by a layer (monolayer or mutilayer). The non-metallic medium may be heterogeneous, in particular the receiving layer (of a first optical element) is made of a material distinct from the separating layer or region (separating first optical elements) and / or from the covering layer (covering first optical elements) . The refractive index of the heterogeneous medium may be the average refractive index. It is preferred that each of the materials of the heterogeneous medium has a refractive index of at most 3.5 and even at most 2.5. A case where the medium is homogeneous (not heterogeneous) is when the first optical element is within a matrix (layer etc). In this case, the matrix is at the same time a receiving layer, a separating layer and preferably a covering layer. The nonmetallic material of the non-metallic medium according to the invention as for it is either electroconductive (semiconductor included that is to say poorly electroconductive) or dielectric. Thus, an oxide and / or carbide and / or nitride of one or more metals falls within the definition of the non-metallic. A conductive transparent oxide, known as TCO, oxide of at least one metal, and generally doped, falls within the definition of non-metal and is electroconductive.

The refractive index is conventionally measured by ellipsometry or deduction after chemical analysis of the material. According to the invention, the refractive index is at 550 nm and preferably over the entire visible spectrum. According to the invention a low refractive index is less than 1.6 and preferably at most 1.5. According to the invention a high refractive index is at least 1.7 and preferably at least 1.8. By section according to the invention is meant the cross section, as opposed to a longitudinal section. The cross-section is preferably along a plane passing through the Z axis. A nanobundle extends along the given axis X1, the cross section (along Z1 and Y1) is preferably (substantially) along Z and Y. Longitudinal (along X1 and Y1) is then preferably in a plane including Z and the normal to X1. In longitudinal section, the nanobonnet is preferably straight, linear. The nanobatonnet can even meander for example around a given direction X1. Preferably, for the nanobonnet, the cross section (along Z1 and Y1) is circular, elliptical, polygonal, rectangular. The lateral ends of the nanobatton are curved (in half-spheres, nanobonds in nanocapsules, etc.) or planar. The nanobead can preferably be (near) symmetry of revolution along Xl. The first optical elements may be of distinct size (via one or all of the dimensions, in particular L1, El and W1, etc.) and / or of distinct geometry, of distinct nature and / or of distinct orientations. Preferably for at least 50% better still at least 80%, even at least 90% (or all) of the first optical elements are nanoparticles or are nanopalets. For simplicity, it is preferable to use a single type of first optical elements (identical or similar dimensions, same nature) and even optical elements, with a possible dispersion on the orientation (a variable). And even preferably 50% better at least 80%, even at least 90% (or all) of the optical elements and even all are first optical elements, and even better nanopalets.

The thickness of the first optical elements may preferably be smaller than the diameter of the conventional dielectric scattering particles (of the order of 400 nm), which makes it easier to obtain a light extraction layer with a low surface roughness and / or less thick. The remarkable efficiency of a first optical element according to the invention can also make it possible to put fewer optical elements in number than conventional diffusing particles, which also makes it possible to obtain a low-roughness light extraction layer. of surface or less thick, for example using a monolayer of optical elements. It remains possible to add conventional scattering particles even if it is preferred to omit them or reduce their number. The lower the angle, the better the light is extracted. It is preferred that the first nanopalet optical element be as symmetrical as possible with respect to the Z axis. From a dimensional point of view, L1, El and W1 will also be adjusted as a function of the metallic material of the first element. optically, the refractive index No. of the nonmetallic medium. The wavelength X of the useful resonance must not be in the infrared field. To place it in the visible, all other things being equal, it is better to choose for metallic material, silver rather than gold, or even copper. All other things being equal, the lower the refractive index of the non-metallic medium, the lower X is. In one embodiment, the first optical elements (nanobatonnets and / or nanopalets) can be linked to the first face, in particular according to two alternative or cumulative configurations: by being directly on the main face, and / or by being on a receiving layer, non-metallic, continuous or discontinuous, interposed between the first optical elements and the first face. The receiving layer is preferably in optical contact by its main face, said internal face on the first side of the substrate, the opposite main face being said external face. The outer and / or inner face can receive even contain the first optical elements. In an alternative embodiment, the receiving layer of the first metallic optical elements (nanobatonnets and / or nanopalets), for example thin and preferably high index, is spaced apart from the substrate (of the first face) 15 and for example fixed peripherally ( by mechanical and / or adhesive means etc) leaving a game (air, vacuum) between the inner face and the first face. The inner face preferably can receive even contain the first optical elements. In one embodiment, the first metallic optical elements (nano-sticks and / or nanopalets) can also be connected to the first face by partial anchoring in the substrate (flush or not with the first face) and / or a non-metallic receiving layer. Naturally, a first metallic optical element (nanobonnet or nanopellet) may comprise one or several (disjoint) porosities or one or more local fractures, or else irregularities of material contours that are so small, punctiform, for example, of smaller dimension than 10nm and better than 5nm. In a first preferred embodiment, the first optical elements (preferably the majority and even at least 90% or all the first optical elements) are the nanoboxes which each have the following dimensions: L1 / E1 in a range of 2 at 5, preferably from 2 to 3 - 12 - - L1 less than 300 nm, better still below 250 nm, even at 150 nm, preferably from 10 nm to 200 nm, better still from 30 to 150 nm and even from 20 to 100 nm or 120 nm - (preferably ) El less than 120nm and even 50nm, preferably in a range of 5nm to 30nm, and even 8nm or 10nm to 30nm, and preferably to (almost) symmetry of revolution along Xl. Typically, W1 can then be less than 75 nm and even 50 nm. W1 can be between El e \ fl <1,2E1.

Preferably, first optical elements (preferably the majority and even at least 90%) are the nanoboxes defined by a magnitude X1 m, satisfying the following equation X1m = 127n0 + 160 (L1 / E1) +33 when no goes from 1 to 2 (and even from 1.3 to 2) and L1 / E1 from 2 to 5 (and even from 2 to 3), Xlm being in a range from 380 to 780 nm, preferably less than 700 nm and even lower than 600nm. Experimentally, the Applicant has discovered that the difference in absolute value between X1 and X is less than 50 nm. In a preferred embodiment, the first optical elements (preferably the majority and even at least 90% or all the first optical elements) are the nanopalets which each have the following dimensions: L1 / E1 in a range of 2 at 5, better still 2 to 3 - L1 less than 300 nm, better less than 250 nm, preferably 150 nm, preferably 10 nm to 200 nm, more preferably 30 to 150 nm and even 20 to 100 nm or 120 nm - (preferably) 120nm and even at 50nm or 40nm, preferably in a range of 5nm to 30nm, and even 8 or 10 to 30nm - 0.5L1 <W1L1 and better 0.6L1 <W1L1 and even more 0.8L1 <W1L1 - preferably at (quasi) symmetry of revolution according to Zl.

Typically, W1 may then be less than 150 nm and even 100 nm. Preferably, the axis X1 of one of the first optical elements, preferably which is a nanobatonnet, forms an angle of at least 45 ° and less than 120 ° with the axis X1 of another of the first optical elements, preferably which is a nanobonnet, and even more preferably between 80 ° and 100 °. More broadly there may be a series of first optical elements along a given axis X1 and another series of first optical elements along another axis X1 which forms an angle of at least 45 ° and less than 120 ° and even more preferably between 80 ° and 100 °.

Depending on the particular manufacturing method, it is possible to arrange to have at least two distinct directions of the X1 axis of the nanoboxes (keeping a according to the invention) and preferably at least three distinct directions or even four directions of at most 90 ° from the nearest (nearest) direction. And it is preferred that the Z1 axis be spaced at most 10 ° of the Z axis, and even at 5 ° or at most 2 °. The X1 axes of the nanoboxes can have random directions. In particular, the first optical elements (metallic or non-metallic), of different or identical size or geometry, can be randomly oriented in orthogonal projection in the plane PO.

In addition, alternatively or cumulatively, it is not necessary that the optical elements are arranged periodically, or at least regularly spaced apart. The first optical elements (metallic or non-metallic) can be distributed or spaced at random. The first optical elements (metallic or nonmetallic) may have at least one random spacing and even a random orientation (X1 axis for the nanobatton). Preferably, first optical elements (metallic or non-metallic), and better still the majority, even all, are distributed, spaced randomly (nanoobjects attached to the first face or, for the first object, nanocavities filled with metal in the non-metallic medium ). The first optical elements (metallic or non-metallic) can be distributed relatively homogeneously on the surface facing the active surface (light emitting). The first optical elements (metallic or non-metallic) according to the invention are disjoint, at a constant distance or variable from each other, preferably on a monolayer. To limit possible interactions, it is preferred that the spacing T1 between all or part (preferably the majority and even at least 90% and even all) first adjacent metallic optical elements (and even between a first optical element and any other material metal) - or first nonmetallic optical elements - is greater than the near field distance. T1 is the distance between the surfaces facing adjacent first optical elements.

In one embodiment for the T1 spacing between all or part (preferably the majority and even at least 90% and even all) of the first adjacent optical elements (of the same monolayer or between two adjacent monolayers) it is preferred that T1 at least 100 nm, preferably at least 200 nm and even at least 250 nm.

If metal is interposed in a so-called separating layer between the first metallic optical elements, it is also preferred that this metal does not touch the first optical elements and is preferably at least 100 nm apart, preferably at least 200 nm. and better than 250 nm, of each first optical element.

The cross section and / or longitudinal of the first optical element (metallic or non-metallic) can be locally deformed, for example shrink or flare. In the same way, the surface of the first optical element (metallic or non-metallic) may be smooth or rough. It is preferred that the roughness of the surface (preferably most or all) be less than E1 / 2 and / or at most 5 nm. In a configuration of the invention, the first metallic optical elements (all or part, preferably the majority and even at least 90% or better all first optical elements) are (reported) on the first face directly or the first optical elements metal on a so-called receiving layer (deposit, film, etc.), non-metallic, bonded to the first face, preferably in optical contact with the first face and even better in adhesive contact. Optionally, all or part of the first optical elements are on the substrate or on the receiving layer, between metal tracks (electrode, lines, mesh etc). The first optical elements in metallic material (preferably the majority and even at least 90% or better all) may correspond to nano-objects (nanopalets and / or nanoboxes) reported on the first face directly or on a non-metallic receiving layer. linked to the first side. The receiving layer (non-metallic) is a so-called bottom layer when it is directly on the substrate (the first face), in particular a deposit on the substrate (the first face). However, one or more layers may be interposed such as a barrier layer (moisture for a plastic substrate, alkali for a mineral glass, etc.) between the substrate (the first face) and this receiving layer. The non-metallic receiving layer may be electroconductive (semiconductor included), for example transparent conductive oxide or conductive polymer, or preferably dielectric. The receiving layer may be an oxide or a nitride or an oxynitride. The non-metallic receiving layer may preferably be less than 200 nm thick, and even less than 100 nm thick. The non-metallic receiving layer may consist of at least one material, preferably dielectric material, chosen from: an oxide, preferably a dielectric oxide, in particular at least one of the following elements: Si, Ti, Zr, a material formed in particular from a silica-based layer deposited by vapor deposition said PVD or from a porous silica layer (sol gel) to lower the refractive index - a polymer (transparent), preferably dielectric material - a vitreous material (non-crystalline): a sol-silica gel, - a gel sol of one or more metals - a (oxy) nitride, in particular silicon or titanium, especially formed from a layer deposited by vapor deposition said PVD or from a sol-gel layer, or a transparent conductive oxide or TCO (doped or not) which may have a functionality (barrier etc.) The receiving layer (non-metallic) can present an indi This refraction is less than 1.6 at 550 nm (low refractive index). It can then be chosen in particular from: a polymeric layer, for example a fluorinated polymer, a silica layer, for example a sol-gel layer. The receiving layer (non-metallic) may be in direct contact with the first metallic optical elements (all or part of the first optical elements). For a gel sol layer (receiving and / or separating layer between the first metallic and / or covering optical elements thus covering the first metallic optical elements), the deposition can be carried out by spraying, immersion and drawing from the ground of silica (or "dip coating"), by centrifugation (or "spin coating"), by casting ("flow-coating"), by roll ("roll coating"). It is thus possible to choose silica prepared from tetraethoxysilane (TEOS), sodium silicate, lithium or potassium or hybrid materials obtained from organosilane precursors whose general formula is R2, Si (OR1) 4. with n an integer between 0 and 2, R1 an alkyl function of the type CxH2x + 1, R2 an organic group comprising, for example, an alkyl, epoxy, acrylate, methacrylate, amine, phenyl or vinyl function. These compounds can be used mixed or alone, in solution in water or in a water / alcohol mixture at an appropriate pH. It is possible to choose a layer based on methyltriethoxysilane (MTEOS), an organosilane with a non-reactive organic group. MTEOS is an organosilane which has three hydrolyzable groups and the organic part of which is a methyl, nonreactive. The receiving layer may be a surface-functional layer: adhesion of the first optical element (metal). The receiver layer may be an adhesion promoter layer with the contact surface of the optical element or a non-metallic coating of the surface of the first metal optical element. The first (metallic) optical elements may be dispersed in a monolayer (first and preferably single) layer on the receiver layer or the substrate. The receiver layer (or even the substrate if it is a receiver) may comprise: surface portions for adhesion of the metallic material, and anti-adhesion surface portions of the metallic material (no deposit possible or easy removal ). The receiving layer (non-metallic) is a so-called bottom layer when it is directly on the substrate (the first face) including a deposit on the substrate (the first face). However, one or more layers may be interposed such as a barrier layer (moisture for a plastic substrate, alkaline for a mineral glass, etc.) between the substrate (the first face) and this receiving layer. The receiving layer (metal) may be preferably less than 200 nm thick, and even less than 100 nm.

The first non-metallic optical elements, preferably dielectric, may correspond to nano-objects (nanobatonnets and / or nanopalets) on a so-called metal receiving layer bonded to the first face, for example (directly) on the first face. In a configuration of the invention of the second object, the first optical elements (all or part, preferably the majority and even at least 90% or better all first optical elements) are dispersed in the metal medium, for example mixed before deposition on the first face, preferably silver-based medium, on a so-called receiving layer (deposit, film, etc.), metal, bonded to the first face, preferably in optical contact with the first face and even better in contact adhesive, for example deposited on the metal receiving layer and then covered with metal or not separate from the receiving layer, preferably silver-based medium. El, W1 and L1 are all nanometric (1 nm to 999 nm) and even less than 500 nm even at 250 nm, at least for W1 and E1. The first optical element (metallic or non-metallic) may be of regular or irregular shape. The nanobundle (metal or non-metallic, preferably dielectric) may be: - in rice grain, in the form of a capsule, - a nanocylinder preferably of revolution (with any base: triangular, polygonal, square, rectangular, ellipsoidal .. .) conical, pyramidal, possibly truncated for example in a plane perpendicular to X1 or oblique. The nanopalet (metallic or non-metallic, preferably dielectric) may be: a nanocylinder, preferably of revolution, with an oval, circular, elliptical, triangular base, etc., in stars (polygonal), possibly truncated for example in a plane, - 18 - - a nanodome for example truncated sphere. Alternatively, or even cumulatively, to first optical elements, in metallic material, reported (nano-objects already described): the first face is structured thus presenting first blind holes at least partially housing the first optical elements (nanopalets and / or nanoboxes) under flush, flush or overlying the first face, and preferably the first optical elements thus housed each comprise a coating of said metal material of the first blind hole, in particular coating directly on the walls of the first blind hole or on an underlayer if applicable, the first blind hole - and / or the first face carries a non-metallic structured layer, preferably dielectric, with a refractive index of at most 3.5 to 550 nm, with the layer having first disjoint holes. , said other holes, at least partially housing the first optical elements (nanopalets and / or nanobaton net) - under flush, flush or overlying the layer - preferably the first optical elements thus housed each comprise a coating of said metal material of the other hole, in particular coating directly on the walls of the other hole or on a sub-surface. possible layer - each other hole which is blind or through (the bottom being portion of first face in particular) -. So we make sure that the first hole (and / or the other hole) forms a hollow (U-shaped section, V ...) and that the metallic material is not in conformity (that is to say, that is say, only covering the bottom and flanks) and fill all or part of the thickness of the hole. The hole can be both in the substrate and in the added layer. In particular, some or even the majority and even all the first (metallic) optical elements are formed by a discontinuous coating of the metal material in the holes, for example by selective deposition and / or by masking. The hole may be in the form of hollow nanopalet or hollow nanobonnet. The holes may be grooves or preferably less elongated, in particular: cylindrical, cubic, cone, ... The hole section may be U-shaped, V-shaped, pyramidal, frustoconical, dome-shaped. The holes are preferably of width W1 and length 1 nanometer and even thickness E'l nanometric.

Preferably, the holes for the nanobatonnets have the following dimensions: the 1 less than 300 nm, better still less than 250 nm, or 150 nm, preferably 10 nm to 200 nm, more preferably 30 to 150 nm and even 20 to 100 nm, - \ A / 1 less than 150nm and even 100nm. Preferably, the holes for the nanopalets have the following dimensions: the 1 below 300 nm, better below 250 nm, or at 150 nm preferably from 10 nm to 200 nm, better still from 30 to 150 nm and even from 20 to 100 nm. / 1 less than 150 nm and even 100 nm. In addition, it may be preferable cumulatively or alternatively to the aforementioned dimensions (nanopalet or nanobonnet) that: the metal material is flush with the first face with a gap between the surface of the first optical element and the first face of the blind hole (or the surface of the added layer for the other hole) of at most 200 nm and even 100 nm, the metal material being flush with the first face (or the other hole) of at most 200 nm and even at most 100 nm, a metallic material that is flush with the first face with a gap between the surface of the first optical element and the first face of the blind hole (or the surface of the added layer for the other hole) of not more than 200 nm and not more than 100 nm . The non-metallic layer structured with such holes forms a separating layer between the first metallic optical elements and even sometimes a receiving layer of the first optical elements being present under the first optical elements in the case of blind holes. The metallic material is for example deposited by liquid phase deposition or vapor deposition. According to the invention, the term metal material for the first optical element, metal (pure or alloyed) in the conventional sense in the periodic table of the elements. It is the same for the metallic medium of the second object.

Conventional diffusing particles in the light extraction layers are, for example, TiO 2 particles of at least 400 nm diameter or even micron. The first optical elements may preferably be smaller (at least for width and thickness), and because of their efficiency it helps to reduce the light extraction region thickness. Similarly, it is not necessarily necessary to planarize the first optical elements, in particular by a dielectric material under the electrode, or at least the thickness necessary for planarization, in particular by a dielectric material under the electrode. can be reduced, especially submicron. Preferably, the extractor support according to the invention comprises a non-metallic layer said separator between the first metal optical elements, a non-metallic covering layer covering at least a first optical element, better or the first optical elements. These two layers can be in fact a single layer with a separating region and a covering region.

The covering layer which is low index can be advantageously discontinuous, that is to say located directly on the first optical elements without extending laterally for example of at most 50 nm or 30 nm. This low index discontinuous covering layer can be of thickness of at most 100 nm and even 50 nm and be coated with a high dielectric or electroconductive layer (TCO, conductive polymer) which also fills the discontinuities. The covering layer of the first optical elements may be at least 20 μm, which is the conventional thickness of the diffusing layer in the case of planarized diffusing enamel and applied by screen printing of the prior art.

Advantageously, to reduce the absorption and because the first metallic optical elements are likely to create a low roughness and may be in smaller quantities because of their effectiveness, the extractor support comprises a so-called non-metallic covering layer covering the first elements. metallic optics (preferably all first optical elements, in particular at least one monolayer), in particular a dielectric layer, preferably forming a planarization of the first optical elements (projecting from the first face), and / or being present between the first optical elements thus also forming a so-called separating layer.

This non-metallic covering layer may be of thickness less than 5 μm, or even submicron (less than 1 μm) of at most 800 nm and even at most 500 nm or at most 300 nm and even at most 150 nm. The thickness of the covering layer can be further reduced (by at most 100 nm or even at most 50 nm for example), in particular since the planarization obtained is sufficient. Thus, the thickness of the covering layer Er may be: at most equal to twice the maximum thickness El m of the first metallic optical element (projecting from the first face) and even at most El m or at most 0.5Elm - or, if at least partially housed in a blind hole of the first face, twice the maximum thickness of the portion of the first metallic optical element which projects from the first face and even at most equal to this maximum thickness or at least plus 0.5 times this maximum thickness - or if at least partially accommodated in a hole of an added layer, twice the maximum thickness of the portion of the first metallic optical element which projects from the added layer, and even at more equal to this maximum thickness or at most 0.5 times that maximum thickness.

The non-metallic covering layer may be: - a monolayer under the electrode, high index, preferably even low index (of at most 100 nm), - a multilayer under the electrode, for example a low-index layer (d ') at most 100nm) and high index (planarization) layer - of a layer forming part or forming the electrode. More broadly, the cumulative thickness of the non-metallic separating layer and the non-metallic covering layer (in particular the layer forming both the separating layer and the covering layer) may be less than 5 μm thick, or even submicron (less than 1pm) of not more than 800nm and not more than 500nm or not more than 300nm and not more than 150nm. The cumulative thickness E, of the separating layer and of the covering layer can be further reduced (by at most 100 nm or even 50 nm for example), in particular since the planarization obtained is sufficient. Thus the cumulative thickness E can be at most equal to three times the maximum thickness E1m of the first metallic optical element (projecting from the first face) and even to at most 2E1m or at most 1.5E1m. This non-metallic covering layer may be: dielectric, oxides such as niobium oxide, zirconium oxide, alumina, tantalum oxide, nitrides such as silicon nitride, of aluminum, - transparent conductive oxide (TCO), for example ITO, AZO, SnO 2: F, SnO 2: Sb, TiO 2: Nb, 15 - based on (nano) metal particles or conductive oxide (s) ( s) in particular in an electroconductive or electrically insulating binder, - in conductive polymer. As conductive polymer for the covering layer (and / or the separating layer between the first optical elements) one can choose from at least one of the following families: the family of polythiophenes, such as PEDOT (3,4-polyethylenedioxythiopene) , PEDOT / PSS, that is to say (3,4-polyethylenedioxythiopene mixed with polystyrenesulphonate, and other derivatives described in US 2004 253439, or - poly (acetylene) s, poly (pyrrole) s poly (aniline) s, poly (fluorene) s, poly (3-alkyl thiophene) s, polytetrathiafulvalenes, polynaphthalenes, poly (p-phenylene sulfide), and poly (para-phenylene vinylene) s. For example, the product marketed by HC Strack under the name BAYTRON® or by Agfa under the name Orgacon® or Orgacon EL-P3040® or Heraeus CleviosTM FET of p less than 10-2 Ohm.cm, or CleviosTM HIL 1.1.P of gold According to the invention, the term "base-based" is understood to mean at least 50% by weight of the (solid) material in question and preferably 80% and even 90% and even more preferentially essentially consisting of. For example, a silica-based layer therefore contains at least 50% by weight and better still at least 80% by weight of silica. A porous silica layer therefore contains at least 50% by weight and more preferably at least 80% by weight of silica on the solid material. A filled silica-based layer therefore contains at least 50% by weight and better still at least 80% by weight of silica on the solid material off-charges.

For example, a first optical element based on silver (pure or alloyed) therefore contains at least 50% by weight and better still at least 80% by weight of silver, whether monolayer (monolithic) or multilayer. It is the same for the metallic medium of the second silver-based object (pure or alloyed) and which therefore preferably contains at least 50% by weight and better still at least 80% by weight of silver, whether it be monolayer (monolithic) or multilayer. The covering layer which is directly on the first metallic optical elements (in particular projecting from the first face away from the substrate) is part of the non-metallic medium of said first optical elements. The non-metallic covering layer (possibly forming a separating layer between the first optical elements) may be chosen from at least one of the following materials: a glass material, in particular an enamel for example based on glass frit, which has a high index of refraction (bismuth, lead, lanthanum) as described in patents WO2009116531, WO2011089343 or WO2010084922 and WO2010084925, - a silicon metal oxide, in particular a gel sol layer and / or a thin layer deposited by PVD, - a metal nitride or oxynitride ( titanium etc) or silicon, for example in contact with an overlying electrode, - a sulphide polymer, and / or a stack of said materials, in particular: - enamel / silicon nitride and / or titanium nitride - layer (ground gel) silica / silicon nitride and / or titanium nitride - silica (sol-gel) layer / titanium oxide (sol-gel) layer (/ silicon nitride and / or titanium nitride) - layer (sol-gel) of silica / layer (sol-gel) silica loaded with high-index particles such as titanium oxide (/ silicon nitride and / or titanium). Also, preferably, the extractor support according to the invention comprises a so-called covering layer, non-metallic, covering the first metal optical elements, preferably forming a planarization layer of the first optical elements projecting from the first face. And preferably, the extractor support according to the invention comprises a non-metallic separating layer between the first metallic optical elements) optionally distinct (by a discernable interface) from the covering layer. The covering layer (and preferably the separating layer) is then based on a material chosen from at least one of the following materials: - a glass material, in particular an enamel preferably high index, - an oxide based on at least one of the following elements: Si, Ti, Zr and their mixtures, in particular a silica, a titanium oxide, a titanium zirconium oxide, a zirconium oxide, silica loaded with nanoparticles of high refractive index (Titanium oxide, etc.), a transparent conductive oxide (TCO), especially based on at least one of the following elements: Sn, In, Zn and their mixtures in particular SnO, ZnO, SnZnO, ITO, ITZO, AZO, GZO, AGZO, a metal or silicon nitride, a transparent polymer especially sulphide, a PEDOT, a PEDOT / PSS, and / or a stack of said materials. If the covering layer has a refractive index of at most 1.6 to 550 nm, such as a layer of silica or substantially silica, it is preferred that it be at most 100 nm and even at most 50 nm to favor the propagation of light to the substrate. One can have a limited lateral extent of each low refractive index covering layer associated with a first metallic optical element, typically each is located on a first metallic optical element and for example with a thickness of at most 100 nm. Between the first metal optical elements and laterally to this localized covering layer and on this covering layer (dielectric layer electrode), a high-index material can be obtained. Preferably, the non-metallic covering layer (called high index) covering the first metallic optical elements (all or at least the majority), and / or being present between the first metallic optical elements (all or at least the majority) thus also forming a so-called separating layer has a refractive index of at least 1.7 to 550 nm (preferably throughout the visible spectrum) and preferably at most 2, preferably between 1.8 and 1.9. In particular, for the high index covering layer, it is possible to choose: an enamel layer based on bismuth, lead or lanthanum oxide, for example those described in patents WO2009116531, WO2011089343 or else WO2010084922 and WO2010084925; silica gel sol (typically of refractive index at 1.44) charged with (nano) particles of higher refractive index, such as titanium oxide, for example at least 30% better 40% in fraction volumetric and even 60% by volume fraction without exceeding 70% preferably (74% corresponds to a compact stack of nanoparticles) or else like zirconia, - a thin layer in particular deposited by PVD: silicon nitride, titanium oxide mixed oxide of titanium and zirconium, zinc oxide, tin oxide, zinc oxide and tin oxide, silica and zirconium oxide, a layer of high-index polymer including sulfide polymer. It is possible to envisage a covering layer deposited by PVD when the roughness of the separating layer and of the first optical elements (metal-leagues) is already limited. Preferably, when the surface of the optical elements and / or the separating layer is (already) Ra less than 10 nm. The average thickness of the covering layer will depend on the roughness of the first metallic optical elements as already mentioned, and / or also on the roughness of the separating layer (distinct) and / or its absorption (or its transparency) and of its refractive index. A submicron thickness and even at most 100 nm are preferred. The covering layer may have ripples on a larger scale than the scale of defects impacting the OLED, that is to say beyond 10 pm. Preferably, the surface of the covering layer is Ra less than 10 nm, better still 5 nm or even 3 nm. The well known roughness parameter Ra can be defined for example according to the standard 1S04287 and measured by atomic force microscopy on lOpm by lOpm.

It is further preferred that the number of macroscopic defects (greater than 5 μm in size, eg dust) of the covering layer be less than 10 per cm 2. This number can be evaluated by optical microscopy. The surface of the covering layer may have large-scale corrugations, for example an amplitude of 1 μm per 100 to 200 μm of lateral period.

The first metal optical elements are preferably separated by solid material. The light extracting support may comprise a low index layer directly on the first optical elements (metal) preferably of at most 100 nm for example silica and a high index layer in the aforementioned materials possibly thicker covering the low index layer. and even planarizing. The extractor support may comprise a so-called non-metallic separating layer between the first (metallic) optical elements; monolayer or multilayer, in particular distinct from the aforementioned non-metallic covering layer and / or the substrate comprises a so-called separating region (non-metallic because dielectric) between the first optical elements (metal) housed (at least partially) in blind holes of the first face. The nonmetallic covering layer is optionally identical in material to the non-metallic separating layer or at least the interface is not distinct as already indicated. A single deposit can form both the separator layer and the covering layer. A single deposit can complete the partial filling between the optical elements and cover the optical elements. The non-metallic separating layer may also be chosen from at least one of the following materials: a glass material, in particular an enamel, a metal or silicon oxide, especially a gel sol layer and / or a thin layer deposited by PVD ), a metal nitride (titanium, etc.) or silicon, a sulphide polymer, a PEDOT, a PEDOT / PSS and / or a stack of said materials. The non-metallic separating layer may thus be based on a material chosen from at least one of the following materials: a glass material, in particular an enamel for example based on glass frit with a high refractive index (bismuth, lead, lanthanum) as described in patents W02009116531 or WO2011089343 or WO2010084922 and WO2010084925, an oxide based on at least one of the following elements: Si, Ti, Zr and their mixtures, in particular a silica, a titanium oxide, an oxide of titanium and zirconium, a zirconium oxide, silica loaded with nanoparticles of high refractive index (titanium oxide, etc.), - a transparent conductive oxide (TCO), in particular based on at least one of the following elements: : Sn, In, Zn and their mixtures in particular SnOx 'ZnOx, SnZnOx, ITO, AZO, IGZO, AGZO, - a metal nitride or silicon - a particular sulfurized polymer, a PEDOT, a PEDOT / PSS. The non-metallic separating layer, called low index, may be of refractive index at 550 nm less than 1.7 at 550 nm and preferably at most 1.5, especially a layer based on silica. It is then preferred that it be at most 100 nm, and even at most 50 nm to promote the propagation of light to the substrate. The non-metallic separating layer may be multilayer, in which case it is each layer of said multilayer index of refraction at 550 nm less than 1.7, which is at most 100 nm, and even at most 50 nm.

Preferably, this non-metallic separating layer (called high index) is of refractive index at 550 nm of at least 1.7 and preferably at most 2, especially between 1.8 and 1.9. In particular, this high-index non-metallic (mono or multi-layer) separating layer may be chosen: - an enamel layer based on bismuth oxide, with lanthanum lead, for example those described in the aforementioned prior art, and or a silica gel sol layer (typically having a refractive index at 1.44 at 550 nm) loaded with nanoparticles of higher refractive index, such as titanium oxide, for example at least 30 - 28 - better 40% by volume fraction and even 60% by volume fraction without exceeding preferably 70% (74% corresponds to a compact stack of nanoparticles), and / or a layer deposited in particular by PVD: silicon nitride, titanium oxide mixed oxide of titanium and zirconium, zinc oxide, tin oxide, zinc oxide and tin oxide, silica and zirconium oxide - and / or a polymer layer (s) high index: sulfide polymer, PEDOT , PEDOT / PSS. The separating layer may be of such thickness that the first metallic optical elements remain protruding or flush with the separating layer. The separating layer between the first (metallic) optical elements may be of thickness less than or equal to the (maximum) thickness of the first optical elements. If the first optical elements (metal) form protuberances (protrude) from the separating layer, a covering layer covering the first optical elements (metal) can also fill the space remaining between the first optical elements (metal). Preferably, the surface of the nonmetallic spacer layer is Ra less than 10 nm, more preferably 5 nm or even 3 nm. If possible, it is not necessary to add a planarization function layer, non-metallic, especially dielectric, on the first optical element (metal). In other words, it can be envisaged that an electroconductive layer of the electrode, then chosen non-metallic, directly covers the separating layer and the first optical elements (metal). Beyond this configuration, a separator layer may be non-metallic and electroconductive, such as a conductive polymer or a TCO, and thus part of an electrode. For example, it is possible to envisage a receiving layer or even a non-metallic and electroconductive bottom, for example a layer deposited by PVD (ITO, etc.), the first metallic optical elements on this layer.

Also, the support may comprise a transparent electroconductive non-metallic layer, based on conductive polymer and / or transparent conductive oxide, covering the first optical elements and / or between the first optical elements, in particular forming or forming part of a In addition, the support may comprise a metal layer in the form of metal tracks, disjoint or interconnected, in particular arranged in a grid, between the first metallic optical elements (and forming part of an electrode) and / or (of preferably) above the first metallic optical elements (and forming part of an electrode) especially on a covering layer, preferably dielectric, on the first optical elements. The spacing may be such between the metal tracks (or a surface such meshes) that the first metallic optical elements are not in contact with the tracks. If first metallic optical elements are in contact with the metal tracks, they are inoperative and are no longer defined as first optical elements but as sacrificial elements. Preferably, the majority are first metal optical elements and not sacrificial elements or at least there are enough first metal optical elements.

It is further preferred that the number of macroscopic defects (greater than 5 μm in size) of the separating layer (coated or not with a non-metallic covering layer) is less than 10 per cm 2. This number can be evaluated by optical microscopy. The separator layer may have ripples on a larger scale than the scale of defects impacting the OLED, that is to say beyond lOpm. The surface of the separating layer may have large-scale corrugations, for example an amplitude of 1 μm per 100 to 200 μm of lateral period. The term separating layer is taken in the general sense it can be: - preferably a deposition of material (x) between the first optical elements (metal) in particular dispersed on the substrate or on a receiving layer on the substrate, - and / or a self-supporting film incorporating the first optical elements (metal), salient or not, and / or the substrate itself if the first optical elements (metal) are in blind holes - and / or a layer ( reported film, deposit ..) if the first optical elements (metal) are in holes (blind or through) of this layer. In the case of a layer (separator and / or covering etc) obtained by sol-gel (silica oxide, titanium, zirconium and their mixtures), a submicron thickness of at most 800 nm and even at most 500nm or better at most 300nm and even at most 200nm or 100nm for better mechanical strength and ease of deposit. To adjust the wavelength it may be desired that at least one of the first optical-metallic elements (and preferably the majority, at least 80% or even all) be surrounded or partially surrounded by a low-index non-metallic medium. (Of refractive index at 550nm less than 1.6 and even at most 1.5), preferably dielectric, said buffer medium in particular which is between the selected high index separating layer and the first optical element, Also, the non-metallic medium (of the majority and preferably at least 80% of the first optical elements) may comprise a non-metallic buffer medium having a refractive index of less than 1.6 at 550 nm and even at most 1, 5, (directly) on said first optical element (its outer surface), or even surrounding (and in contact with) said first optical element, preferably with a thickness of at most 100 nm preferably even at most 50 nm and even at least 8nm, better at least 20nm or 30nm, buffer medium preferably partly above the first face.

The buffer medium may be a so-called buffer layer attached to the first optical element (metal) or deposited in a hole of a high-index structured layer before forming the first optical element by a metal coating on the buffer layer. The low-index buffer medium may comprise a silica layer, especially a sol-gel layer, and even a porous silica layer (to lower the refractive index) and even air. The buffer medium (in particular a deposit) may be adjacent to a separating layer between the first optical elements, of refractive index of at least 1.7 to 550 nm and preferably of at most 2, in particular between 1.8 and 1.9. The buffer medium may be identical in material to the receiving layer of the first optical elements or to the substrate. The buffer medium may also include the low-index substrate. The buffer medium may be silica, a low-enamel index, a silica layer, in particular a sol-gel layer, and even a porous silica layer (for lowering the refractive index). The (external) surface of at least one of the first (metallic) optical elements, and preferably the majority or even at least 80% or even all, may comprise a coating chosen from: a so-called low index subscript layer; of refraction less than 1.6 at 550 nm and preferably at most 1.5, preferably at most 100 nm and for example at least 8 nm better at least 20 nm or 30 nm, said first optical element optionally being surrounded by said low index layer; - an adhesion promoting coating with the first face or an optional receiving layer on the substrate. The light to be extracted (in particular OLED) meets at least one first optical element (metal) before being absorbed. The distance traveled before complete absorption is of the order of a few microns. It follows that, on at least 80% of the surface intended to form the extraction zone (for example corresponding substantially to the surface of the electrode): the number of nanoballets (metal) per unit area is known Less than 1 per pm 2 and even more preferably greater than 3 per pm 2 and preferably less than 10 per pm 2. the number of nanopalts (metal) per unit area is greater than 1 per pm 2 and even more preferably greater than 3 per pm 2 and preferably less than 10 per pm 2 According to the invention, the resistivity of the non-metallic electroconductive medium or at least the electroconductive separating layer and / or the same or distinct electroconductive covering layer; may be less than or equal to 500mOhm.cm, preferably less than or equal to 50mOhm.cm, If it is a TCO this may be less than 0.1mOhm.cm. If it is a semiconductor, it is in particular between 0.1 and 50 mOhm.cm (inclusive), preferably between 5 and 50 mOhm.cm (inclusive). For the second object, the non-metallic material of the first optical element in the metal medium may be electroconductive, in conductive transparent oxide, conductive polymer, rather than dielectric. On at least 80% of the surface intended to form the extraction zone (for example corresponding substantially to the surface of the electrode), it is preferred that: the number of nonmetallic nanoballets per unit area is greater than 1 per pm 2 and even preferably greater than 3 per pm 2 and preferably less than 10 per pm 2. the number of nonmetallic nanopalets per unit area is greater than 1 per pm 2 and even more preferably greater than 3 per pm 2 and preferably less than 10 per pm 2. The material of the first dielectric optical element in the metallic medium comprises or is composed of at least one of the following dielectric materials, for example: an oxide based on at least one of the following elements and mixtures thereof; Si, Ti, Zr, optionally porous silica for lowering the refractive index, - a polymer especially polystyrene (PS), latex, polymethyl methacrylate (PMMA), - a vitreous material (non-crystalline): a glass (mineral), a glass-ceramic, an enamel, in particular which is the material of the substrate, or an oxide based on at least one of the following elements and their mixtures, optionally doped; Sn, In, Zn and mixtures thereof, which oxide may be dielectric or electroconductive (semiconductor included). One can also have a stack of the aforementioned materials. You can also choose a ceramic. The material of the first non-metallic optical element, preferably dielectric, in the metal medium (preferably most or all) preferably has a refractive index of less than 1.8 and even 1.65 or 1 , 5 to 550nm and better in the entire visible spectrum. The material may then be comprised in particular: a polymer, optionally porous silica, a hollow dielectric element (silica, etc.), air, the substrate material, in particular glass (mineral). The first non-metallic, preferably dielectric, optical element may have a non-metallic solid core element and coated with one or more non-metallic functional coatings. The metal medium, preferably based on silver (pure or alloyed) may comprise a metal multilayer, formed of a metal receiving layer of the first non-metallic optical elements, a metal separating layer between the first non-metallic optical elements and a metal covering layer 10 on the first nonmetallic optical elements. The cumulative thickness is preferably at most 15 nm and even at most 10 nm. This can be done by electronic lithography. Preferably, in the case of first optical elements (metallic or non-metallic) reported on the first face (on and / or above), this number is calculated by projecting the optical elements possibly on the first face. If two first optical elements (metallic or nonmetallic) are in exact coincidence one above the other are these two optical elements. According to the invention, the term "layer" is taken in the broad sense and may be deposition (s) of material, film (s) reported (s). It may be a monolayer of material or a multilayer of material (s), and / or a part of the substrate (upper part on the first side). The non-metallic medium (in particular the separating layer, the covering layer) is chosen so as to have as little absorbency as possible and to be as transparent as possible. Preferably, for the first object: - the absorption of the substrate / (under layer (s)) / (receiving layer) / first optical elements / separator layer is at most 10% and better at most 5%, absorption of the substrate / (underlayer) / (receiver layer) / first optical elements / (separator layer) / covering layer is at most 10% and better 'not more than 5%. Preferably, for the first object: - the TL light transmission (or at least the transmission at 550 nm) of the substrate assembly // (sublayer (s)) / (receiving layer) / first optical elements / layer buffer) / separating layer is at least 75% better by at least 80% - the light transmission (or at least 550nm) of the subset // (under layer (s)) / (receiving layer ) / first optical elements / buffer layer) / separating layer / covering layer is at least 75% better than at least 80%. TL or transmission at 550 nm is measured using a spectrophotometer. A first region may be provided with first metallic optical elements and a second region above the first region in a direction opposite to the substrate) of different or identical first metallic optical elements.

For example, at least a second monolayer of first optical elements (metal), in the form of nanoobjects, is above the first monolayer of first optical elements reported on the substrate. Between the first and second layers there may be a preferably high index layer.

Preferably, for the second object, the absorption of the subsystem / (underlayer (s)) / first optical elements in a metallic medium is at most 10% and preferably at most 5%. In the particularly preferred embodiment with the metal nanoboxes: the nanoboxes are based on pure or alloyed silver, preferably nano-objects reported, L1 / E1 in a range from 2 to 3; 100 nm or 120 nm and / or preferably E1 of 8 or 10 to 30 nm, a separation layer between the nanoboxes has a refractive index of at least 1.7 to 550 nm, oxide layer (s), a possible covering layer covers (the majority and even all) the nanoboxes and has a refractive index of at least 1.7 to 550 nm, a separating and covering layer that can be a single layer, the layer assembly separator and covering layer being of thickness Er less than lpm and even 250nm or 150nm, and even preferably the thickness between the substrate and the electrode being less than 5pm and even 1 pm and even 250nm or 150nm , possibly the nanobatonnet is surrounded or at least has on its surface this a low refractive index layer, preferably at most 100 nm, especially under the covering layer (high index). In the preferred embodiment with dielectric nanobatonnets: the nanoboxes are nano-objects, preferably of silica, the nanobundet is optionally surrounded or at least comprises on its surface a low refractive index layer, L1 / E1 in a range of 2 to 3, - Ll of 20 to 100nm or 120nm and / or preferably El of 8 or 10 to 30nm, - the metal medium is preferably based on pure silver or alloyed, for example a metal multilayer, formed of a metal receiving layer and a metal separating layer and a metal covering layer, layers of identical material (silver), of cumulative thickness of at most 15 nm and at most 10 nm. In the preferred embodiment with metal nanopalets: the nanopalets are based on silver, pure or alloyed, preferably nano-objects reported, El in a range of 2 to 3, Ll of 20 to 100nm or 120nm and / or preferably E1 of 8 or 10 to 30 nm, and even 0.51_1 <W1L1 better 0.81_1 <W1L1, a separating layer between the nanopalets is of refractive index of at least 1.7 to 550 nm, preferably a layer of oxide (s), a possible covering layer covers the nanopalets and has a refractive index of at least 1.7 to 550 nm, separating and covering layer which can be a single layer, the separating layer and layer layer wherein the thickness of the cover is less than 1 μm and even 250 nm or even 150 nm, and even preferably the thickness between the substrate and the electrode is less than 5 μm and even 1 μm and even 250 nm or at 150 nm, possibly the nanobatonnet is surrounded or at least comprises on its surface a layer s refractive index, preferably at most 100 nm, especially under the covering layer (high index). In the preferred embodiment with dielectric nanopalets: nanopalets are nano-objects preferably silica, optionally the nanopalet is surrounded or at least comprises on its surface a low refractive index layer, preferably at most 100nm . - L1 / E1 in a range of 2 to 3, - Ll of 20 to 100nm or 120 nm and / or preferably El of 8 or 10 to 30nm, - and even 0.5L1 <W1 better 0.81_1 <W1 - the metallic medium is preferably based on pure silver or alloyed, for example a metal multilayer, formed of a metal receiving layer and a metal separating layer and a metal covering layer, layers of identical material (silver) , of cumulative thickness of not more than 15 nm and not more than 10 nm. For the first object, the extractor support according to the invention may additionally comprise an electrode in the form of a single or multilayer electroconductive layer: continuous, or discontinuous, in particular arranged in a grid, metallic, possibly planarized by an electroconductive layer ( mineral or polymer), especially directly on the dielectric selected separating layer and / or directly on the dielectric selected covering layer. For a solid layer, mention may be made of a TCO (ITO etc.) or a metal multilayer. For a discontinuous metal layer there may be mentioned a grid as described in WO2009071821. The width A of the tracks may be less than 30 μm, preferably 1 to 20 μm, even more preferably 1.5 μm to 15 μm. The distance B between two tracks can be at least 50pm and even at least 200pm and B is less than 5000pm, better less than 2000pm or even 1000pm. Another possible characterization of a discontinuous metal electrode (in tracks, in grid), preferably in silver, has a coverage ratio T which is preferably less than 25% and even more preferably less than 10%, and even less than 10%. 6% and 2%. The average thickness of the tracks may be between 100 nm and 5 μm, more preferably from 0.5 to 3 μm, or even between 0.5 and 1.5 μm, in order to easily maintain transparency and high conductivity. The network of metal tracks can be irregular. The tracks may be in disjoint strips or preferably interconnected in particular to form meshes.

Advantageously, the electrode according to the invention (gate or continuous layer) may have a square resistance less than or equal to SOhm / square, or even less than or equal to 10 ohm / square, or even 0.50hm / square. An electroconductive coating on the metal grid can by its resistivity, its cover of the grid and its thickness, contribute to a better distribution of the current. The surface of this electroconductive coating may preferably be intended to be in contact with the organic layers of the OLED: in particular the hole injection layer ("HIL") and / or the hole-transporting layer (" HTL ") or be part of the HIL or HTL or play HTL or HIL. This electroconductive coating is monolayer or multilayer for example a conductive polymer (such as those already mentioned above) or tin oxide, indium oxide, zinc oxide, molybdenum oxide MoO3, tungsten oxide W03, vanadium oxide V205, ITO, IZO, SnZnO.

The extractor support according to the invention may comprise in particular a metallic layer arranged in metallic tracks, in particular in a grid, forming part of an electrode: between the first metallic optical elements and / or below the first metallic optical elements; above the first metallic optical elements. If above, it is desirable that at least one of the first optical elements (metal) and preferably several first optical elements (metal) are facing areas between the metal tracks. Thus, alternatively or cumulatively with the presence of a metallic layer in tracks, the extraction support according to the invention can comprise a non-metallic transparent electroconductive layer, in conductive polymer or in transparent conductive oxide, forming part (or even forming ) of the electrode and covering the first metallic optical elements, in particular directly covering the first optical elements, and / or is present between the first metallic optical elements, forming part of a separating layer, or covering a separating layer between the first optical elements, in particular forming a transparent electrode. This non-metallic electroconductive layer is monolayer or multilayer, for example a conductive polymer (such as those already mentioned above) or else tin oxide, indium oxide, zinc oxide, molybdenum oxide MoO 3, tungsten oxide WO 3, vanadium oxide V205, ITO, IZO, SnZnO. Specifically refers to metal material for the first optical element a pure metal material or alloy. The first optical element may be a monolayer or monolithic or a metal multilayer. The metallic material is metallic in the conventional sense, in particular based on an elemental metal such as silver, gold, aluminum, copper, nickel, platinum and their alloys. The first metallic optical element may even be formed of a layer of contiguous electroconductive particles. The first metallic optical element may therefore consist of an as-semblement of metal particles, in a monolayer or a plurality of layers, in electrical contact or in an electroconductive matrix for example metal and another metal. The surface of the first metallic optical element may optionally be coated with a non-metallic functional layer: - protection against oxidation, corrosion, - low layer refractive index. The transparent, dielectric substrate, preferably a polymer, a plastic substrate and / or a glass substrate, in particular a glazing of any thickness, as thin as possible, in particular in mineral glass, particularly ultramined, a glass textile, optionally a composite substrate, for example a glass-fiber in a polymer matrix. The substrate may be a transparent thermoplastic polymer, for example polyethylene, polyester, polyamide, polyimide, polycarbonate, polyurethane, polymethylmethacrylate, or a fluoropolymer. In this case, a layer of oxide, nitride or oxynitride deposited by gel sol, by PVD or CVD, or a polymeric layer rather than an enamel is preferred for the separating layer and / or for the covering layer. The receiving layer may be on or part of a (muti) barrier layer for example as described in the patent application. The substrate may have a second main face opposite to the first face and the exit side of the light. This second face may have a textured potential free surface or comprise external light extraction means known per se as a lenticular network, means in the form of a deposit or a film added in optical contact with the second face. Alternatively or cumulatively, the second face may comprise a (multi) functional functional layer (anti-reflective, anti-fouling, hydrophobic, etc.). The substrate, especially glazing, can be flat or curved, including a car glazing (roof, roof, side window, rear quarter, rear window, windshield).

The substrate, particularly glazing, can be assembled preferably on the side of this second face in double glazing (insulating or vacuum) or triple glazing, or even be laminated to another glazing glass or plastic. The plastic substrate is for example a polyethylene terephthalate (PET) for example with a thickness of at least 50 μm and generally at most 250 μm.

Finally, the invention relates to an OLED device (to any other guided mode light beam emitter) incorporating the light extracting support, an electrode (above, on and / or between the optical elements), an organic electroluminescent system on a light emitting surface. For a given organic electroluminescent system of given emission spectrum (monochromatic or plurichromatic), it is arranged to be in the emission spectrum. Several methods can be envisaged for manufacturing the first optical element made of metallic material, in particular electron lithography known per se. In the case of the first optical elements, in nanopalet in particular, one method is to use the "HCL" for "hole mask colloidal lithography" in English or else a dewetting of the metallic material, preferably silver (deposit a continuous layer and then annealed for example under nitrogen). For the manufacture of the first optical elements made of metallic material via the blind holes of the substrate or the holes of a structured layer on it is preferred electronic lithography known per se. Other features and advantages of the invention will now be described with reference to the drawings in which: FIGS. 1, 1a, 1b, 1c, 2, 3, 4, 5, 5 ', 6 , 6 ', 7, 7', 8 each represent a sectional view of an OLED device incorporating a light extracting support with metal nanopalets in a non-metallic medium in embodiments of the invention of the first object. FIG. 5 "is a sectional view of an OLED device incorporating a light extracting support with dielectric nanopalets in a metal medium in one embodiment of the invention of the second object. 1 is a perspective view of metallic nanopalets placed on the glass substrate in one embodiment of the invention, FIG. Fig. 1 is a perspective view of a metal nanopalet at an angle to the glass substrate in one embodiment of the invention - Figs. 1d to 1n show in perspective or top view examples of metallic nanopalets in Embodiments of the invention Fig. 5 is a top view of the example of Fig. 5 with metallic nanopalets between and in a metal grid in a mode of realization ion of the invention. FIG. 6 "shows a perspective view of metallic nanopalets housed in blind holes in the glass substrate in one embodiment of the invention. FIGS. 1 ', 1a, 1b, 1c, 2 ', 3', 4 ', 5a, 5b, 5d, 6a, 6b, 7a, 7b and 8a each represent a sectional view of an OLED device incorporating a light extracting support with metal nanobits into modes 5c shows a sectional view of an OLED device incorporating a light extracting support with dielectric nanoconnets in a metal medium in an embodiment of the invention of the second object. 1a is a side view of a nanobarton of the example of FIGURE 1 '- FIGURE ID is a perspective view of metal nanobitches placed on the glass substrate embodiment of FIG. the invention - Figure c represents a perspective view e of a metal nanobutlet at an angle to the glass substrate in one embodiment of the invention. FIGS. 1d-1c show in perspective or side views examples of metal nanobits in an embodiment of the invention. - Figure 6 "is a perspective view of metal nanobitonnets housed in blind holes of the glass substrate in one embodiment of the invention.

The figures below are diagrammatic and are not to scale. FIG. 1 represents a schematic sectional view of an OLED device 1000 incorporating a light extracting support 100 in a first embodiment of the invention.

The light extracting support 100 comprises a transparent dielectric substrate 1, here a glazing for example of silicosodocalcique glass, such as the Planilux glazing sold by Saint Gobain Glass, for example of thickness 1.1 mm. We can prefer a clear glass, even extraclair and as thin as possible. Alternatively, it is a plastic (rigid, semi rigid or flexible) including polyethylene terephthalate (PET), and has for example a thickness of 200pm. The TL light transmission of the substrate 1 is preferably at least 80% better by at least 90%. The glazing 1 is for example rectangular. The glazing 1 has a first main face 11 and a second opposite main face 10 (on the output side of the light), optionally free surface textured or comprising external means of extraction of light known per se. Alternatively or cumulatively, the second face 10 may comprise a (multi) functional layer (anti-reflective, anti-fouling, hydrophobic, etc.).

Light extracting elements of the OLED system, said optical elements 2, of metal, are connected to the first face 11 in a non-metallic manner here via a so-called non-metallic, for example dielectric, preferably indexing, receiving layer layer 14. n refraction at most 3.5 to 550nm better in the entire visible spectrum and even at most 2.5 to 550nm better in the entire visible spectrum. The light transmittance TL of the lens assembly 1 / receiver layer 14 is preferably at least 80% better by at least 90% and / or the receiver layer 14 does not cause the TL of the glazing 1 to fall further. of 5%. The receiver layer may have a functionality such as attachment or stability of the optical elements and / or be inherent in the manufacturing process.

Each optical element 2 is a metal element with a so-called low or internal surface 21 oriented towards the first face, here in contact s3 with the receiving layer 14, a so-called external or high surface 22 opposite the inner surface, a wafer defining in this first embodiment, more precisely, each optical element 2 corresponds to a larger nanopalet than thick, which in a simple form here is a nanodisk, a straight cylinder with a circular base such as shown in zoom in figure 1 a. The nanopalets 2, made of metallic material, preferably made of silver, thus each have first, second and third nanometric dimensions: the first dimension, called length L1, being the largest and along an axis X1, the second dimension dimension, said thickness E1, being along an axis Z1 perpendicular to X1 and being the smallest of the dimensions perpendicular to X1, the third, said width W1, being along an axis Y1 perpendicular to X1 and Z1, with L1 / E1> 1.5 and better L1 / E1> 2, and with L1 / E1 <20 - and with W11.5E1 and 0.31_1 <W1L1. A plane P1 is formed by two vectors i and j respectively parallel to X1 and Y1 and passing through a point A of the nanopalet closest to the first face opposite the nanopalet as shown in Figure 1a. In this simple nanodisk form, L1 is here equal to W1. In variants: the high and / or low surface is not flat (remaining defined by a closed curve), for example half-spherical (in dome) and / or the following cylinder Z1 is not right (low surface and high surface partially facing one another). The substrate has a plane P0, local plane that is to say facing the first optical element, defined by X and Y axes perpendicular to each other and by an axis Z normal to the plane P0. The nanopalet 2 is preferably (quasi) invariant by rotation around the Z axis, as here a nanodisk. The nanopalets 2 are here placed horizontally on the layer 14 (or alternatively the first face directly) so the plane P1 forms with the plane PO a zero angle. The thickness El is thus following Z and X1 and Y1 are in the plane P0. As shown in FIG. 1b, the nanopalets 2 are dispersed on the receiving layer or on the first face 11 alternatively and spaced for example randomly without being in contact with each other. Preferably the majority and even at least 80% are spaced apart by at least 100 nm, preferably at least 200 nm and even at least 250 nm. More generally, it is possible to tolerate a certain inclination of the nopalet 2 with respect to the substrate 1. As shown in FIG. 1c, for a nanopalet 2 represented in the form of a nanodisk for simplicity, the plane P1 forms with the plane PO at an angle of at most 30 ° and preferably at most 10 ° and even at most 5 ° or at most 2 °. Each nanopalet 2 is further surrounded by a non-metallic medium of refractive index no of at most 3.5 to 550 nm better in the entire visible spectrum and even at most 2.5 to 550nm better in the entire visible spectrum.

This medium can be defined as the surrounding matter that surrounds the nanopalet 2 at the visible wavelength divided by the refractive index in the visible medium. It can be considered that the thickness of the medium all around the nanopalet 2 is at most 150 nm and even at most 100 nm. The non-metallic media of the nanopalets 2 are preferably of the same material and of substantially identical size. So all nanopalets share the same surrounding matter preferably. Here, a layer 40, thicker than the nanopalets, presents between the nanopalets, a separating layer form, and is here directly on the nanopalets, on the upper surface 22. This layer 40 has a refractive index of at most 3, 5 to 550nm - better in the entire spectrum of the visible - and preferably greater than 1.7 even to 1.8 and better to at most 2. The middle of each nanopalet (identical for all) here comprises: - the layer 40, separator and covering, high index - the receiving layer 14 (or alternatively the substrate).

The medium is heterogeneous, especially if the receiving layer 14 is made of material distinct from the separating layer and / or the covering layer. It is preferred that each of the materials of the heterogeneous medium has an index of at most 3.5 and even at most 2.5. W1, L1 and E1 are such that each metal nanopalet 2 in its nonmetallic medium has a diffusion cross-section which has a wavelength resonance X in the air in a range of 380 to 780 nm, resonance is advantageously excitable by a planar electromagnetic wave progressive, monochromatic and wavelength in the air XE in the visible spectrum, defined by a magnetic field H polarized parallel to the plane PO and orthogonal to the direction of propagation which is as for it is in the plane PO and parallel to the orthogonal projection of L1 on the plane P0. The choice of metal and the refractive index No. of the medium influences W1, El and L1. W1, L1 and E1 can vary from one nanopalet 2 to another, as can the shape, the metallic material and the orientation. X, can vary from one nanopalet to another. Elements of the same dimensional or architecture as the nanopalets but misdirected can exist without harming the extraction efficiency. Preferably less than 20% better than 10 ° A and even less than 5% are misdirected optical elements. The region of the layer 40 between the nanopalets is said layer or separating region, the region of the layer between the nanopalets is said covering layer and is preferably of low local roughness surface. This layer 40 may be formed after the nanopalets are on the receiving layer 14. The layer 40 is a dielectric with a high refractive index, that is to say a refractive index of at least 1.7 and even a refractive index. at least 1.8 and preferably at most 2 to 550 nm, better in the entire visible spectrum.

The thickness is as thin as possible, in particular submicron. This is a single layer but can be made in several stages of deposition. The nanopalets are arranged in a monolayer on the receiving layer. However, one can have several monolayers of nanopalets or even have other optical elements (conventional etc.) dispersed within the layer 40. A transparent electrode 5 is on the covering region of the layer 40 directly or indirectly via a functional layer. dielectric (barrier etc) for example a layer of silicon nitride or titanium. This transparent electrode is formed of a TCO, for example ITO or based on ZnO (AZO, IZO, AGZO, IGZO) or stacking thin layers with silver (one or more silver layers) for example AZO / Ag / ITO. Silver stacks are described in WO2008 / 029060, WO2008 / 059185, WO 2009/083693, WO2013 / 098532. The upper surface 22 is preferably spaced a distance di_ from the electrode 5, in particular from the nearest continuous metal layer, greater than 200 nm and even from any added metallic material. This transparent electrode comprises alternatively a pure or alloyed metallic electrode, preferably silver or even aluminum, discontinuous, especially in grid with a coverage rate adjusted for the chosen transparency. The receiving layer 14 is organic and / or mineral, preferably dielectric, transparent (low absorbency). If necessary, adjust its thickness to avoid too much absorption. The refractive index may be low. The receiving layer 14 is directly on the first face or on a functional sub-layer known per se (single-layer or barrier stack with alkalis, water ..). In one configuration, this receiver layer 14 is a coating of the first face (or sub-layer). It can form a promoter layer of adhesion with the nanopalet to avoid its detachment and / or disorientation.

The material of the nanopalet is preferably silver (pure or even alloyed). If it is a nanopalet multilayer (multimaterial) metal, preferably at least 70%, at least 80% and even at least 95% of the thickness of the multilayer is silver. The receiving layer 14 is in adhesive contact with the first face 11, 15 is a deposit deposited by any common means: liquid route, by PVD or CVD. It is alternatively a polymeric film, already carrying the nanopalets before its assembly with the glazing (mineral). Optionally, this film is attached to the first face by adhesive means such as an optical adhesive (in particular a peripheral adhesive) or even a laminating interlayer (transparent thermoplastic such as polyvinyl butyral (PVB), ethylene / vinyl acetate copolymer (EVA). Receptor layer 14 is optional The nanopalets 2 may be directly on the glazing 1, for example functionalized (surface treatment) to promote the adhesion of the nanopalets and / or to promote the proper orientation of the nanopalets. The electrode 5, preferably an anode, is then conventionally covered with an organic electroluminescent system 6 and a cathode 7. manufacture of nanopalets may induce low dispersion of size and / or shape As preferred materials: - for nan opalet: pure silver or alloy - for layer 40: titanium oxide (sol gel or PVD), zirconium or their mixtures, sol silica gel (typically with a refractive index of 1.44 ) charged with (nano) particles of higher refractive index, such as titanium oxide preferably at least 60% by volume fraction, an enamel (preferably in a submicron layer) - for the optional receiving layer 14: silica, especially sol gel and preferably from a precursor TEOS or MTEOS. Alternatively not shown, the nanopalets can be housed for example frozen, partially in the receiving layer 14.

Alternative examples of metal nanopalets (the nonmetallic medium is not shown) are shown in Figures 1d to 1n. In other variants, they are non-metallic, preferably dielectric and even low index, and in a metal medium. The nanopalet 2 may have a circular or oval base 21 and a trapezoidal section as shown in Figure 1d and 1e. The lower surface 21 may be greater than the upper surface 22 (FIG. 1 a) or the reverse (FIG. 1 e). The nanopalet 2 may be a parallelepiped as shown in FIG. More generally, the bottom surface 21 or base of the nanopalet is a preferably flat closed curve. The base of the nanopalet, preferably cylindrical and better straight cylinder, can be circular (Figure 1g), rectangular (Figure 1h), square (Figure li), irregular contours (Figure 1j), triangular (Figure 1j). The nanopalet 2 may have an oval base 21 and form a nanodome as shown in FIG. 11 and 1m. The base 21 can be placed on the re-ceptive layer or the top of the dome is placed on the receiving layer as an alternative. The nanopalet 2 can be of Chinese hat shape as shown in Figure 1 n. FIG. 1a shows a diagrammatic sectional view of an OLED device 1000b incorporating a light extracting support 100b in a variant of the first embodiment of the invention and which differs from the first embodiment in the choice of the layer. covering 40 'which is electroconductive, non-metallic, conductive polymer or TCO such as for example ITO or AZO or IZO (or a TCO multilayer) and preferably forms the electrode 5'. FIG. 1ter is a schematic sectional view of an OLED device 1000c incorporating a light extracting support 100c in a variant of the first embodiment of the invention which differs from the first mode in the number of layers or zones. with nanopalets. Indeed, other identical or distinct nanopalets 2 are inserted into the aforementioned nanopalets 2 (shape and / or size) possibly on another receiving layer (optional here in dotted lines) 14b, preferably of high refractive index, on the covering layer. initial. The covering layer is then more precisely divided into two layers respectively lower layer 40a (covering first zone of nanoboxes) and upper layer 40b (covering second zone of nanoboxes) of different or equal thicknesses (submicron). For example, the upper layer 40b is thicker than the lower layer 40a for a planarization function. The lower layer 40a may also be of a different nature from the upper layer 40b and even of low refractive index, especially if the thickness is less than 100 nm. A nanopalet 2 of the first zone may be in coincidence or shifted by a nanopalet 2 of the second zone. FIG. 1quater shows a schematic sectional view of an OLED device 1000d incorporating a light extractor support 100d in a variant of the first embodiment of the invention and which differs from the first embodiment in the type of connection. between the first face 11 and the receiving layer 14d. The receiving layer 14d, which is a high index, as thin as possible, in particular a polymeric film or a mineral layer, is bonded to the substrate 1 (glass, mineral or plastic) in a peripheral manner, in this case by glue 16. There is has an air gap 4d between the inner face with the nanopalets 2 and the first face 11. This receiving layer between the nanopalets 2 and the electrode 5, is directly under the electrode 5 on its main face opposite to the receiving face nanoparticles. The plane P1 is spaced from the plane PO and remains parallel. FIG. 2 represents a diagrammatic sectional view of an OLED 2000 device incorporating a light extracting support 200 in a second embodiment of the invention. This support 200 differs in that the nanopalets 2 (whose upper surface 22) are covered directly by a layer 41, for example deposited by liquid or PVD, of thickness less than the thickness (maximum) of the nanopalets 2. For example, the nanopalets 2 are directly on a plastic substrate 1 'or alternatively glass (mineral glass) or on a receiving layer. The layer 41 also forms a thin separating layer between the nanopalets 2 and can be a low refractive index in the visible layer (less than 1.6 and even at most 1.5 to 550 nm), in particular plus 100nm, or be high refractive index.

The layer 42 covers the assembly, and like the layer 41, is dielectric. It is high refractive index in the visible (at least 1.7 and even 1.8 and at most 2 preferably), and preferably of submicron thickness of not more than 300nm or more more than 150nm. The covering layer 42 is on the layer 41 (indirectly on the nanopalets) and also between the nanopalets and allows for example still to planarize locally. As preferred materials: - for the nanopalet: pure silver or alloyed - for the layer 42: a titanium oxide (sol gel or PVD), zirconium or mixtures thereof, silica in particular sol gel (typically of refractive index at 1.44) charged with (nano) particles of higher refractive index, such as titanium oxide preferably at least 60% by volume fraction, enamel (submicron layer) - for the thin layer separator 41: - a low refractive index layer such as optionally porous silica made by gel sol method, - a high refractive index layer such as a titanium oxide, zirconium oxide or their mixtures, a silica gel sol layer ( typically of refractive index at 1.44) charged with (nano) particles of higher refractive index, such as titanium oxide at 60% by volume fraction without exceeding 70%, as a plastic substrate : a PET (or alternatively a mineral glazing). FIG. 3 is a diagrammatic sectional view of an OLED 3000 device incorporating a light extractor support 300 in a third embodiment of the invention. This support 300 differs from the first embodiment in that a layer 41 'said separator thickness less than the (maximum) thickness of the nanopalets is between these nanopalets without covering them. The separating layer 41 'may be a low refractive index layer and preferably of at most 100 nm or a high refractive index. The layer 42 is covering and dielectric, high refractive index in the visible (at least 1.7 and even 1.8 and preferably at most 2 to 550 nm), preferably submicron even at most 300 nm or still not more than 150nm. The layer 42 is directly on the separating layer 41 'and directly on the nanopalets 2 and also between the nanopalets and allows for example still to planarize locally. Layer 14 is optional. If necessary (in this embodiment or the others), a layer 43 is added between the covering layer 42 and the electrode 5, for example a layer of (oxy) nitride of silicon or titanium which can serve for example as protection in case of etching of the electrode, typically by an acidic solution. This layer 43 for example of thickness less than or equal to 30 nm and preferably greater than or equal to 3 nm or even 5 nm.

The preferred materials are identical to those of the second embodiment. FIG. 4 represents a schematic sectional view of an OLED device 4000 incorporating a light extracting support 400 in a fourth embodiment of the invention. This support differs from the first embodiment in that the layer 44 (separator and covering), dielectric, is a low layer refractive index in the visible, for example a layer of silica. Preferably, its thickness is at most 100 nm and even at most 50 nm. It is not necessarily a layer of planarization. In this configuration, it is preferable to use an electrode 5 without a metallic layer, in particular a TCO (ITO etc.) or a transparent conductive polymer, since the nanopalet metal distance 2 and the electrode 5 are relatively close. It is also possible to insert between the layer 44 and the electrode a high refractive index functional dielectric layer such as a layer based on silicon nitride or on titanium nitride or on titanium (and zirconium oxide) oxide. ). The separating layer 44 may be of the same metal oxide or silicon dioxide as the receiving layer 14 ', preferably silica, especially in the gel sol layer. The interface (here dashed) is not necessarily discernable. The middle of each nanopalet is therefore silica here. The substrate may be a mineral glass or alternatively a plastic, even a plastic film. The preferred materials for the nanopalet 2 are identical to those of the first embodiment. For the layer 44, it is possible to choose silica deposited by CVD or by gel sol and optionally porous (with removal of the pore-forming agent), as for example described in WO2008 / 059170. FIG. 5 is a schematic sectional view of an OLED device 5000 incorporating a light extracting support 500 in a fifth embodiment of the invention which differs from the first embodiment in the choice of the electrode which comprises a discontinuous metal layer 5a, preferably based on silver, in the form of metal tracks. The discontinuous metal layer 5a can be arranged in a regular or irregular grid: interconnected tracks forming meshes of any shape or disjoint strips fed at the periphery (by current electrical contact zones called bus bar (s)) especially on opposite edges of the electrode) preferably in a common manner. An electroconductive layer 50 (less electroconductive than the metal tracks 5a) covers the metal tracks 5a and preferably fills at least the upper region or even all the areas between the metal tracks. This material 50 can therefore be used to planarise locally including metal tracks and to level the slope caused by the tracks. This layer 50 may be made of conductive transparent polymer such as PEDOT / PSS or TCO such as ITO, AZO, etc. It may alternatively be a layer forming part of the organic electroluminescent system 6. Of course , all configurations of nanopalets in their environments of the preceding and following embodiments are possible with such an electrode. The nanopalets 2 under the metal tracks may be close to the metal tracks and it is preferable to favor the presence of metal nanopalets offset from the metal tracks 5a. FIG. 5 'is a schematic sectional view of an OLED device 5000' incorporating the light extracting support 500 'in a variant of the fifth embodiment by the positioning of the discontinuous electrode 5a. In particular, the metal discontinuous layer 5a formed of metal mesh tracks (or parallel), preferably silver, is directly on the receiving layer 14 or alternatively on the substrate 1 (by removing the receiving layer).

The discontinuous metal layer 5a may cover one or two nanopalets already present (s) and become inoperative (are no longer in a non-metallic medium according to the invention) and do not hinder or have little influence on the electrical performance or on the roughness of the metal layer 5a. The electroconductive material 50 (less electroconductive than the metal tracks 5a) forms a covering layer 40 'which further directly covers the nanopalets (the upper surface 22) in addition to covering the metal tracks 5a. The metal tracks 5a of the discontinuous electrode (here in mesh, or parallel ..) are narrow and widely spaced, as shown in plan view in FIG. 5 ".

FIG. 5 "is a schematic sectional view of an OLED device 5000" incorporating a light extracting support 500 "in a variant of the embodiment of FIG. 1. The support 500" differs in the nature of the nanopalets 2a which Examples of these are dielectrics, for example, silica or a polymeric material and, preferably, silver with their metal medium. For example, the nanopalets are on a metallic silver receptive layer 140 and then covered by a covering layer 40 also in silver.The cumulative thickness of the receiving layer and the covering (and separating) layer is as follows: The electrode 5 is preferably not more than 15 nm, for example a TCO, or alternatively the covering layer 40 "forms part of the electrode 5.

From a viewpoint of form, size and positioning tolerance with respect to the substrate 1, the same is retained as for the metallic nanopalets. Figure 6 is a schematic sectional view of an OLED 6000 device incorporating a light extractor support 600 in a sixth embodiment of the invention. Here, the nanopalets 20 are housed in the substrate 1, for example a glass or a plastic. Indeed, the first face is structured thus having disjoint blind holes 12, in the form of (nano) hollow pallet, of nanometric width and of at least nanometric depth and of preferably submicron length, each metal nanopalet 20 is formed by a metal coating 20 filling all or part of the hole. The upper region 12 'of the glass 1 forms the separating layer of the nanopalets 20, preferably spacing them at least 100 nm from each other. The PO plane of the substrate is the "top" plane of the first face 11. P1 passes through a point A of the nanopalet closest to the first face opposite the nanopalet. The angle a between PO and P1 can of course vary from one nanopalet to another. As shown in FIG. 6, which is a detail and sectional view of one of the nanopalets 20 in a variant of FIG. 6, the metal (the silver here) extends beyond the blind hole 12. maximum thickness of the nanopalet (metal coating) is greater than the thickness of the blind hole 12. The hole may be of width \ AP1 and of length L 1 substantially equal (right nanocylinder base or circular bottom) and distributed for example randomly 30, as shown in FIG. 6 "As a variant of FIGS. 6, 6 'or 6", the covering layer 40 is not dielectric but is electroconductive, for example a TCO (ITO, AZO, GZO, ZTO, etc.) and forms all or Figure 7 is a schematic sectional view of an OLED device 7000 incorporating a light extracting support 700 in a seventh embodiment of the invention close to the sixth mode.

Here, the nanopalets 2 'are partially integrated in an added layer 47 on the substrate 1, housed in holes of this layer 47, for example of high index (titanium oxide gel sol or silica loaded with high-index particles) or silica and then preferably less than 100 nm thick. Indeed, the layer 47 is structured thus having diverging through holes 47a (or blind in the alternative) disjoint, in the form of hollow nanopalets (here right nanometer), of nanometric width and depth preferably at least nanometric and length of submicron preference, each nanopalet is formed by a coating 2 'filling all or part of the hole. This structured layer 47 further effectively forms the nanopalet separator layer 2 ', preferably the spacing of at least 100 nm (hole spacing, edge to edge). The plane P1 forms an angle here zero with the local plane PO of the substrate. As shown in FIG. 7 'alternative of Figure 7, the through holes 47a (or blind) can be first lined with a so-called material buffer 47b low refractive index (silica, porous silica or polymer) flanking the flanks and the first face 11 thus, leaving a hollow nanopalet cavity (smaller), then the metal coating 20 'fills all of the cavity formed by the sides of the buffer material and the bottom of the buffer material. In FIGS. 6 to 7 ', the flanks of the holes may be normal to the substrate (thus Z) or inclined at most 10 ° preferably. As a variant of FIG. 7 or 7 ', the covering layer is not dielectric but is electroconductive for example a TCO (ITO etc.) and forms all or part of the electrode. An extractor support 800 is shown in FIG. 9a, variant of the example of FIG. 7. Disjoint and here blind holes 49 '- in the form of hollow nanopalet - are formed in a high index element 49, such as a film transparent polymer high index. The metal coating 20 is deposited in the disjointed holes and the element 49 is then brought back to the first face 11 of the substrate 1 of mineral or plastic glass, for example rigid. The element 49 is in optical contact in particular in adhesive contact by its structured face between the holes 49 'filled with metal 20.

FIG. 1 'is a diagrammatic sectional view of an OLED device 1000 incorporating a light extractor support 100' in a first embodiment of the invention involving nanobatonnets. The light extracting support 100 'comprises a transparent dielectric substrate 1, here a glazing for example of silicosodocalcique glass, such as the Planilux glazing sold by Saint Gobain Glass, for example of thickness 1.1 mm. We can prefer a clear glass, even extraclair and as thin as possible. Alternatively, it is a plastic (rigid, semi rigid or flexible) including polyethylene terephthalate (PET), and has for example a thickness of 200pm. The TL light transmission of the substrate 1 is preferably at least 80% better by at least 90%. The glazing 1 is for example rectangular. The glazing 1 has a first main face 11 and a second opposite main face 10 (on the output side of the light), possibly free textured free surface or having external means for extracting light known per se. Alternatively or cumulatively, the second face 10 may comprise a (multi) functional layer (anti-reflective, anti-fouling, hydrophobic, etc.). Light extracting elements of the OLED system, said optical elements 2 ', are connected to the first face 11 in a non-metallic manner here via a so-called non-metallic receiving layer layer 14, for example a dielectric layer, preferably having a refractive index n d at most 3.5 to 550nm better in the entire visible spectrum and even at most 2.5 to 550nm better in the entire visible spectrum. The TL light transmission of the receiving layer substrate assembly is preferably at least 80% better by at least 90% and / or the receiving layer does not lower the TL of the substrate by more than 5%.

Each optical element 2 'is an elongated metal element, forming a nanobonnet, with a so-called low or internal surface 21' oriented towards the first face, here in contact s3 with the receiving layer 14, a so-called external or high surface 22 'to the opposite the inner surface and opposite lateral surfaces (or ends) 23 ', 24'. As shown by zooming in FIG. 1a, each nanobonnet 2 ', in a simple form here is a nanocylinder, straight cylinder with flat lateral ends 23', 24 '. As shown in FIG. 1a, the nanobatonnets 2 'made of metallic material, preferably made of silver, each have first, second and third nanometric dimensions: the first dimension, called length L1, being the largest and the next an axis X1, the second dimension, called the thickness E1, being along an axis Z1 perpendicular to X1 and being the smallest of the dimensions perpendicular to X1, the third dimension, called the width W1, being along a perpendicular Y1 axis; to X1 and Z1, - with L1 / El> 1.5 and better L1 / El> 2, and with L1 / E1 <20 - with El eV1 <1.5E1 and L1> W1. The thickness E1 here is equal to the width W1, the lateral ends 23 'and 24' are flat and circular. In variants: the lateral end 23 'and / or 24' is not flat (remaining defined by a closed curve), for example half-spherical (domed) and / or the following cylinder X1 is not right (lateral extremities partially facing). The substrate has a plane P0, local plane that is to say facing the first optical element, defined by X and Y axes perpendicular to each other and by an axis Z normal to the plane P0. In the orthonormal coordinate system XYZ, the nanobead 2 'is preferably (quasi) invariant by rotation about the X axis, as here a circular base nanocylinder 23'. The nanobumns 2 'are here placed horizontally on the layer 14 (or alternatively the first face directly) so the axis X1 forms with the plane PO a zero angle. The thickness E1 is therefore following Z. As shown in FIG. 1, the nanobodies 2 'are dispersed on the receiving layer 14 and spaced for example randomly without being in contact with each other. Preferably the majority and even at least 80% are spaced apart by at least 100 nm, preferably at least 200 nm and even at least 250 nm. More generally, it is possible to tolerate a certain inclination of the nanobubble 2 'with respect to the substrate 1. As shown in FIG. 1c, for a nano-stick of the nanocylinder type for simplicity, the axis X1 forms with the plane PO at an angle of at most 30 ° and preferably at most 10 ° and even at most 5 ° or at most 2 °. Each nanobubble 2 'is further surrounded by a non-metallic medium with a refractive index of at most 3.5 to 550 nm better in the entire visible spectrum and even at most 2.5 to 550 nm better. in the whole spectrum of the visible. This medium can be defined as the surrounding matter that surrounds the nanobead 2 'at the visible wavelength divided by the refractive index in the visible medium. It can be considered that the thickness of the medium all around the nanobonnet 2 'is at most 150 nm and even at most 100 nm. The nanobatonnets are preferably of the same material and of substantially identical size. So all nanopartets share the same surrounding matter preferably. Here, a layer 40, thicker than the nanoboxes, is present between the nanoboxes, as a separating layer, and is here directly on the nano-sticks, on the upper surface 22. This layer 40 has a refractive index of plus 3.5 to 550nm - better in the entire spectrum of the visible - and preferably greater than 1.7 even to 1.8 and better not more than 2. The middle of each nanobonnet here comprises: - the layer 40, separator and covering, high index - the receiving layer 14 (or alternatively the substrate). The medium is heterogeneous, especially if the receiving layer 14 is made of material distinct from the separating layer and / or the covering layer. It is preferred that each of the materials of the heterogeneous medium has an index of at most 3.5 and even at most 2.5. W1, L1 and E1 are such that each metal nanoballon 2 'in its non-metallic medium has a diffusion cross-section which has a wavelength resonance X in the air in a range of 380 to 780 nm, This resonance is advantageously excitable by a planar electromagnetic wave, monochromatic and wavelength in the air XE in the visible spectrum, defined by a magnetic electric field H polarized parallel to the plane PO and orthogonal to the direction of propagation which is in the plane PO and parallel to the orthogonal projection of L1 on the plane P0. The choice of metal and the refractive index No. of the medium influences W1, El and L1. W1, L1 and E1 can vary from one nanobonnet 2 'to the other, as can the shape, the metallic material and the orientation. X, can vary from one nanobonnet to another. Elements of the same size or architecture as the mis-oriented nanobaton-mats may exist without detracting from the extraction efficiency. Preferably less than 20% better less than 10% and even less than 5% are misdirected optical elements. The organic and / or inorganic receiving layer 14 is preferably dielectric, transparent (not very absorbent). If necessary, adjust its thickness to avoid too much absorption. The region of the layer 40 between the nanobox is said layer or separating region, the region of the layer between the nanobox is said covering layer and is preferably of low local roughness surface. This layer 40 may be formed after the nanoboxes are on the receiving layer 14. The layer 40 is dielectric with a high refractive index, ie with a refractive index of at least 1.7 and even at minus 1.8 and preferably at most 2 to 550 nm, better in the whole of the visible spectrum. The thickness is as thin as possible, in particular submicron. It is a single layer but can be made in several stages of deposition. The nanobatonnets are arranged in a monolayer on the receiver layer. However, it is possible to have several monolayers of nanobonnets 2 'or even to have other optical elements (conventional etc.) dispersed within the layer 40. A transparent electrode 5 is on the covering region of the layer 40 directly or indirectly via a layer dielectric functional (barrier etc) for example a layer of silicon nitride or titanium. This transparent electrode is formed of a TCO, for example ITO or based on ZnO (AZO, IZO, AGZO, IGZO) or stacking thin layers with silver (one or more silver layers) for example AZO / Ag / ITO. Silver stacks are described in WO2008 / 029060, WO2008 / 059185, WO 2009/083693, WO2013 / 098532. The upper surface 22 is preferably spaced a distance di_ from the electrode 5, in particular from the nearest continuous metal layer, greater than 200 nm and even from any added metal material. This transparent electrode comprises, as a variant, a metal-league electrode, pure or alloyed, preferably silver or even aluminum, discontinuous, in particular in a grid with a coverage ratio adjusted for the chosen transparency. The receiving layer 14 is organic and / or mineral, preferably dielectric, transparent (little absorbent). If necessary, adjust its thickness to avoid too much absorption. The refractive index may be low. The receiving layer 14 is directly on the first face or on a functional sub-layer known per se (single-layer or barrier stack with alkalis, with water, etc.). In one configuration, this receiver layer 14 is a coating of the first face (or sub-layer). It can form an adhesion promoter layer with the nanobonnet to prevent its delamination and / or disorientation. The nanobonnet material is preferably silver (pure or even alloyed). If it is a multilayer (multimaterial) nanobard metal, preferably at least 70%, at least 80% and even at least 95% of the thickness of the multilayer is silver. The receiving layer 14 is in adhesive contact with the first face 11, is a deposit deposited by any common means: liquid, PVD or CVD route. It is alternatively a polymeric film, already carrying nanobatonnets before its assembly with the glazing (mineral). Optionally, this film is attached to the first face by an adhesive means such as an optical adhesive 30 (in particular a peripheral adhesive) or even a laminating interlayer (transparent thermoplastic for example, such as EVA, PVB, etc.). This receiving layer 14 is optional. The nanobatonnets 2 'can be directly on the glazing 1, for example functionalized (surface treatment) to promote the adhesion of the nanoboxes and / or to promote their proper orientation. The first face may in particular be functionalized by an adhesion promoter surface treatment in particular plasma, corona discharge. The electrode 5, preferably an anode, is then conventionally covered by an organic electroluminescent system 6 and a cathode 7. The method of manufacturing the nanoboxes can induce a small dispersion of the size and / or the shape. . As preferred materials: - for the nanobonnet: pure silver or alloy - for the layer 40: a titanium oxide (gel or PVD sol), zirconium or their mixtures, silica gel sol (typically of refractive index at 1.44) loaded with (nano) particles of higher refractive index, such as titanium oxide preferably at least 60% by volume, enamel (preferably in a submicron layer) - for the receptor layer 14: silica, in particular sol gel and preferably from a TEOS precursor or even MTEOS. In a variant that is not shown, the nanoboxes may be housed for example fixed, partially in the receiving layer 14. Alternative examples of metallic nanopalets (the non-metallic medium is not shown) are shown in FIGS. Alternatively, they are nonmetallic, preferably dielectric and even low index, and in a metalic medium. The nanobonnet 2 'may be a straight nanocylinder with lateral ends 23', 24 'curved as shown in FIG. 1d and even semi-spherical, such as a nanocapsule (see FIG. 1f). The nanobundle 2 'can be more or less corrugated according to Z1 (cf. FIG. 1e), preferably with an amplitude less than E1 / 10 with respect to Z1, or alternatively can be more or less corrugated in the plane parallel to PO according to X1. preferably with an amplitude less than E1 / 10 with respect to X1. The nanobundle 2 'can have a lateral end 23' (resp 24 ') or oval or elliptical base: - 61 - - with, as shown in the figure, the g the major axis which is W1 and the minor axis which is E1, - or with as shown in figure th the major axis which is El and the minor axis which is Wl.

The nanobundle 2 'may have a lateral end 23' (or 24 ') -or curved and irregular closed planar surface as shown in FIG. The nanobundle 2' may be a parallelepiped with a lateral end 23 '(resp 24') or rectangular base as shown in FIG. 11 or square, as shown in the figure, the k or even trapezoidal as shown in FIG. 1. Figure tbis is a diagrammatic sectional view of an OLED device 1000'b incorporating a light extracting support 100'b in a variant of the first embodiment of the invention with nanoparticles 2 'and which differs from the first embodiment of FIG. by the choice of the covering layer 40 'which is electroconductive, non-metallic, of conductive polymer or TCO such as for example ITO or AZO or IZO (or a TCO multilayer) and preferably forms the electrode 5'. FIG. 1b is a diagrammatic sectional view of an OLED device 1000'c incorporating the light extracting support 100'c in a variant of the first embodiment of the invention with nanobatonnets which differs from the first mode by the number of layers or areas with nanobones. Indeed, other nanoboxes 2 according to the invention which are identical or distinct are inserted into the aforementioned nanopalets 2 (shape and / or size) possibly on another receiving layer (optional dotted here) 14b, preferably with a high index of refraction, on the initial covering layer. The covering layer is then more precisely divided into two layers, respectively the lower layer 40a (covering the first zone of nanoboxes) and the upper layer 40b (covering the second zone of nanoboxes) 30 with different or equal thicknesses (submicron). The upper layer 40b for example is thicker than the lower layer, for a planarization function. The lower layer 40a may also be of a different nature from the upper layer and even of low refractive index, especially if the thickness is less than 100 nm. A nanobonnet 2 'of the first zone may be in coincidence or shifted by a nanobonnet 2' of the second zone. FIG. 1c shows a schematic sectional view of an OLED device 1000'd incorporating a light extracting support 100'd in a variant of the first embodiment of the invention with nanobatonnets and which differs from FIG. first embodiment by the type of connection between the first face 11 and the receiving layer 14d. The receiving layer 14d, high index, the thinnest possible, in particular a polymeric film or a mineral layer, is bonded to the substrate 1 (glass, mineral or plastic) peripherally, here by glue 16. There is a blade 4d of air between the inner face with the nanoboxes 2 and the first face 11. This receiving layer 14d between the nanoboxes 2 'and the electrode 5, is directly under the electrode on its main face opposite the receiving face of the nanoboxes. . FIG. 2 'is a schematic sectional view of an OLED device 2000' incorporating a light extracting support 200 'in a second embodiment of the invention with nanobatonnets.

This support 200 'differs in that the nanobatonnets 2' (whose upper surface 22) are covered directly by a common layer 41, for example deposited by liquid or PVD, of thickness less than the (maximum) thickness of the nanoboxes. 2 '. For example the nanoparticles 2 'are directly on a plastic substrate 1' or alternatively glass (mineral glass) or on a receiving layer. The layer 41 also forms a thin separating layer between the nanoparticles 2 'and can be a low refractive index layer in the visible range (less than 1.6 and even at most 1.5 to 550 nm), in particular with a thickness of at most 100nm, or be high refractive index.

The layer 42 covers the assembly, and like the layer 41, is dielectric It is high refractive index in the visible (at least 1.7 and even 1.8 and at most 2 preferably), and preferably of submicron thickness of at most 300 nm or at most 150 nm. The covering layer 42 is on the layer 41 (indirectly on the nanobatonnets) and also between the nanobatonnets and allows for example still to planarize locally. As preferred materials: - for the nanobonnet: pure silver or alloy - for the layer 42: a titanium oxide (sol gel or with PVD), zirconium or their mixtures, silica in particular sol gel (typically index refractive index 1.44) charged with (nano) particles of higher refractive index, such as titanium oxide preferably at least 60% by volume fraction, enamel (sub-micron layer) - for fine separating layer 41: a low refractive index layer such as silica, optionally porous, made by a sol-gel method, a high refractive index layer such as a titanium zirconium oxide, or mixtures thereof, a silica gel sol layer ( Typically of refractive index at 1.44) charged with (nano) particles of higher refractive index, such as titanium oxide at 60% by volume fraction without exceeding 70%, - as plastic substrate: a PET (or alternatively a mineral glazing).

FIG. 3 'is a schematic sectional view of an OLED device 3000' incorporating a light extractor support 300 'in a third embodiment of the invention with nanobatonnets. This support differs from the first embodiment with nanobatonnets in that a layer 41 'called a separator with a thickness less than the thickness (maximum) of the nanoboxes 2' is between these nanobatonnets without covering them. The separating layer 41 'may be a low refractive index layer and preferably of at most 100 nm, or a high refractive index. The layer 42 is a dielectric covering having a high refractive index in the visible range (at least 1.7 and even 1.8 and preferably at most 2 at 550 nm), preferably at least 300 microns or even still not more than 150nm. The layer 42 is directly on the separating layer 41 'and directly on the nanoboxes 2' and also between the nanoboxes 2 'and allows for example still to planarize locally. If necessary (in this embodiment or the others), a layer 43 is added between the covering layer 42 and the electrode 5, for example a layer of (oxy) nitride of silicon or titanium which can be used for example of protection in case of etching of the electrode, typically by an acid solution. This layer 43 for example of thickness less than or equal to 30 nm and preferably greater than or equal to 3 nm or even 5 nm.

The preferred materials are identical to those of the second embodiment with nanoboxes. FIG. 4 'is a schematic sectional view of an OLED device 4000' incorporating a light extractor support 400 'in a fourth embodiment of the invention with nanobatonnets. This support differs from the first embodiment with nanobatonnets in that the layer 44 (separator and covering), dielectric, is a low layer refractive index in the visible, for example a layer of silica. Preferably, its thickness is at most 100 nm and even at most 50 nm. It is not necessarily a layer of planarization. In this configuration, it is preferable to use an electrode 5 without a metal layer, in particular a TCO (ITO, etc.) or a transparent conductive polymer, since the nanobead 2 'distance between the metal and the electrode is relatively close. It is also possible to insert between the layer 44 and the electrode a high refractive index functional dielectric layer such as a layer based on silicon nitride or titanium nitride or on titanium (and zirconium) oxide. The separating layer 44 may be of the same metal oxide or of silicon as the receiving layer 14 ', preferably silica, especially in the gel sol layer. The interface (here dashed) is not necessarily discernable. The medium 4 of each nanobonnet is therefore silica. The substrate may be a mineral glass or alternatively a plastic, even a plastic film. The preferred materials for the 2 'nanobonnet are identical to those of the first embodiment. For layer 44 it is possible to choose silica deposited by CVD or by gel sol and optionally porous (with removal of the pore-forming agent), as for example described in WO2008 / 059170. FIG. 5a is a schematic sectional view of an OLED device 5000a incorporating a light extracting support 500a in a fifth embodiment of the invention with nanoboxes which differs from the first embodiment with nanobatonnets by the choice of the electrode which comprises a discontinuous metal layer 5a, preferably silver-based, in the form of metal tracks. The discontinuous metal layer 5a can be arranged in a regular or irregular grid: interconnected tracks forming meshes of any shape or disjoint strips fed at the periphery (by current electrical contact zones called bus bars (s)) especially on opposite edges of the electrode) preferably in a common manner. An electroconductive layer 50 (less electroconductive than the metal tracks 5a) covers the metal tracks 5a and preferably fills at least the upper region or all the zones between the metal tracks.

This material 50 can therefore be used to planarise locally including metal tracks and to level the slope caused by the tracks. This layer 50 may be made of transparent conductive polymer such as PEDOT / PSS or TCO such as ITO, AZO, etc. It may alternatively be a layer forming part of the organic electroluminescent system 6.

Of course, all configurations with nanobatonnets in their backgrounds of the previous and subsequent embodiments are possible with such an electrode. The nanoboxes 2 'under the metal tracks 5a may be close to the metal tracks and it is preferable to favor the presence of metallic nanobonnets offset from the metal tracks 5a. FIG. 5b represents a schematic sectional view of an OLED device 5000b incorporating a light extracting support 500b in a variant of the fifth embodiment with nanobatonnets by the positioning of the discontinuous electrode 5a. In particular, the metal discontinuous layer 5a, formed of metal mesh tracks (or in parallel), preferably silver, is directly on the receiving layer 14 or alternatively on the substrate 1 (by eliminating the receiving layer). The metallic discontinuous layer 5a may cover one or more 2'X nanobatonnets already present and which become inoperative (no longer in a non-metallic medium according to the invention) and do not hinder or have a slight influence on the electrical performance. or on the roughness of the metal layer 5a. The metal tracks 5a of the discontinuous electrode (here in mesh, or parallel ..) are narrow and widely spaced. The electroconductive material 50 (less electroconductive than the metal tracks 5a) forms a covering layer 40 'which further directly covers the nanoboxes (the upper surface 22) in addition to covering the metal tracks 5a. FIG. 5c represents a schematic sectional view of an OLED device 5000c incorporating a light extracting support 500c in a variant of the embodiment of FIG. 1 '.

The support differs in the nature of the nanoboxes 2'a which are dielectric, for example silica or a polymeric material and preferably by their metal medium silver. For example, the nanoboxes 2'a are on a metallic silver receptive layer 140 and then covered by a covering layer 40 "also made of silver The cumulative thickness of the receiving layer and the covering layer is at most 15 nm. From a viewpoint of form, size and positioning tolerance with respect to the substrate 1, the same is maintained as for the metal nanoboxes, and preferably the electrode 5 is not metallic, for example is a TCO. Alternatively, the covering layer 40 "is part of or even forming the electrode 5. FIG. 6a is a schematic sectional view of an OLED device 6000a incorporating a light extracting support 600a in a sixth embodiment of the invention with nanorods. Here, the nanobatonnets 20 'are housed in the substrate 1, for example a glass or a plastic. Indeed, the first face is structured thus having disjoint blind holes 12, in elongate shape, of nanometric width and of at least nanometric depth and of preferably submicron length, each metal nanobonnet 20 'is formed by a coating 20 in said metallic material (silver) filling all or part of the hole. The upper region of the glass 12 'forms the spacer layer of the nanobeads 20', preferably spaced by at least 100 nm. The PO plane of the substrate is the "top" plane of the first face 11. For each nanobonnet 20 ', the axis X1 forms with the plane PO an angle α of at most 2 °. The angle α between the axis X 1 and PO can of course vary from one nanobonnet to another. As shown in FIG. 6b, which is a detail and sectional view of two 20 'nanodonets in a variant of FIG. 6a, the metal extends beyond the blind hole 12. The maximum thickness of the nanobatet (metal coating) is larger than the thickness of the blind hole. The hole may be in the form of a hollow nanobonnet of substantially equal width and length but oriented for example randomly as shown in FIG. 6c. The X1 axes (or their orthogonal projections on P0) of the metal nanoparticles 20 'may be along the X or Y axis or obliquely along the same axis. As shown in FIG. 6c, the X1 axes (or their orthogonal projections on P0) nanoboxes 20 'are along X, one or others along Y, one or others having a Y and X component. variant of FIGS. 6a, 6b or 6c, the covering layer 40 is not dielectric but is electroconductive for example a TCO (ITO, AZO, GZO, ZTO etc.) and forms all or part of the electrode 5. FIG. is a schematic sectional view of an OLED device 7000a incorporating a light extracting support 700a in a seventh embodiment of the invention close to the sixth mode with nanobatonnets. Here, the nanoboxes 20 'are partially integrated in a layer 47 on the substrate 1, housed in holes of this layer 47, for example of high index (titanium oxide gel sol or silica loaded with high particles). index) or of silica and then preferably of thickness less than 100 nm. Indeed, the layer 47 is structured thus having through holes 47a (or blind alternatively) disjoint of nanometric width and depth preferably at least nanometric and of preferably submicron length, each nanobaton is formed by a coating 20 filling all or part of the hole. This structured layer 47 furthermore forms the separation layer of the nanoboxes 20 ', preferably spaced apart by at least 100 nm (hole spacing, edge to edge). As shown in FIG. 7b alternative of FIG. 7, the through-holes 47a (or blind holes) can be first lined with a so-called low-refractive index material 47b (silica, porous or even polymer-like silica) matching the flanks and the first face 11, leaving a hollow cavity (smaller), then the metal coating 20 'fills all of the cavity formed by wife flanks of the buffer material and the bottom of the buffer material.

In FIGS. 6a to 7b, the flanks of the holes may be normal to the substrate (along Z, for example) or inclined by at most 10 ° preferably. As a variant of FIG. 7a or 7b, the covering layer is not dielectric but is electroconductive for example a TCO (ITO etc.) and forms all or part of the electrode.

An extractor support 800 is shown in Figure 8 'variant of the example of Figure 7a. Disjoint holes 49 'and here blind 45' are formed in a high index element 49, such as a high-index transparent polymer film. The metal coating 20 'is deposited in the disjointed holes and then comes to report the element 49 to the first face 11 of the substrate 1 of mineral or plastic glass, for example rigid. The element 49 is in optical contact in particular in adhesive contact by its structured face between the holes 49 'filled with metal 20'. EXAMPLES OF RESONANCE EXAMPLE 1 Nanopalets in the form of nanodiscs (circular cylindrical base and straight) of dimensions El (thickness), W1 (width), L1 (length) are chosen. The nanopalets are on the first face of a glass substrate of refractive index n = about 1.5 in the visible or on a layer of silica deposited on the first face of the glass (by PVD vapor deposition , frost soil ...). The separating layer between nanodiscs and covering nanodiscs is silica of refractive index equal to about 1.5 in the visible with an over-heel of 50 nm compared to nanodiscs. Thus the middle of each nanopalet is about 1.5, or low index. W1, L1 and E1 are such that the nanopalet in its nonmetallic medium has a scattering cross section which has a resonance at a wavelength λ in the visible range and is even less than 700 nm.

Two examples are given in the following table. Examples W1 (nm) L1 (nm) E1 (nm) km (nm) 1 70 70 500 550 25 500 500 As a first variant, each nanopalet is in a low-index buffer medium formed by the substrate and a low-index dielectric coating of each nanopalet, for example silica, with a thickness of 30 nm. This coating can also be on three sides so be absent from the low surface (contact with the first side). Between and on these coated nanopalets is present a high index layer selected from enamel, a sol gel layer or even a deposition by PVD. This separating and covering layer is submicron. In the second variant, the nanopalets are on a high index receptor layer such as silicon nitride, titanium oxide and / or zirconium etc.). Between and directly on these nanopalets is a high-index layer selected from enamel, a sol gel layer or even a PVD deposit. This separating and covering layer is submicron. The receiving layer may be of the same material as the separating and covering layer and thus the interface is not necessarily discernible.

Two examples are given in the following table taking the middle index at 1.8. Examples W1 (nm) L1 (nm) E1 (nm) Xm (nm) ## STR00004 ## Example 1 We choose silver nanobodies, more precisely in the form of nanocapsules (lateral ends in half-spheres), of dimensions El (thickness), W1 (width), L1 (length). The nanocapsules are on the first side of a glass substrate of refractive index n = about 1.5 in the visible. In a first series, the separating and covering layer is silica having a refractive index equal to about 1.5 in the visible range with an excess of 50 nm relative to the nanocapsules. Thus the middle of each nanocapsule is about 1.5 or so low index. In a second series, the nanocapsules are on a high index receptor layer such as silicon nitride or a titanium oxide (and / or zirconium). Between and directly on these nanocapsules is a high index layer selected from enamel, sol gel layer or even PVD deposition. This separating and covering layer is submicron. The receiving layer may be of the same material as the separating and covering layer and thus the interface is not necessarily discernible. W1, L1 and E1 are such that the nanocapsule in its medium has an effective diffusion section that has resonance at a visible wavelength λ. W1 and El are identical and correspond to the diameter of the nanocapsule. Ll is nanometric. Examples are given in the following table according to the index n, of the medium. Examples E1 (nm) L1 (nm) (Li / El) n, Xm (nm) 1 1.5 540 2 '15 45 3 1.5 700 3' 15 30 2 1.8 580 4 '15 More broadly, the nanobanks may be defined by a magnitude satisfying the following equation X1m = 127n0 + 160 (L1 / E1) +33 when no is 1 to 2 and L1 / E1 is 2 at 5 with X, 1 m which is in a range of 380 to 780nm. The difference in absolute value between Xlm and is less than 50nm.5

Claims (22)

REVENDICATIONS1. Light extracting medium (100 to 800 '), in particular light emitted from a surface light source such as an organic electroluminescent system (7), comprising: a substrate, transparent (1, 1') and dielectric, with a main face (11 ), said first face, - light extraction elements (2, 2 ', 20, 20'), said optical elements, disjoint and connected to the first face, each optical element being in a non-metallic medium which is d refractive index no of at most 3.5 to 550 nm, characterized in that at least a part of the optical elements, said first optical elements (2, 2 ', 20, 20') are of metallic material, three-dimensional, and each having first, second and third nanometric dimensions, the first dimension, called length L1, being the largest and along an axis X1, the second dimension, called thickness E1, being along an axis Z1 perpendicular to X1 and being the smallest of the dimensions pe perpendicular to X1, the third, said width W1, being along an axis Y1 perpendicular to X1 and Z1, with L1 / E1> 1.5 and L1 / E1 <20, in that each first optical element being: (a) a nanotip (2, 20), with El e \ fl <1.5E1 and L1> W1, or (b) a nanopalet (2 ', 20'), with W1 '1.5E1, and 0.3Ll <W1 1_1 , a plane P1 being formed by two vectors i and j respectively parallel to X1 and Y1 and passing through a point A of the nanopalet closest to the first face opposite the nanopalet, in that L1, El and W1 of each first element optical being such that each first optical element in said non-metallic medium has a scattering cross-section which has a resonance at a wavelength λ, in the air in a range of 380 to 780nm, and that the substrate with a plane P0, for each nanobatonnet the axis X1 forms with the plane PO an angle α of at most 30 ° and for each nanopalet the plane P1 forms with the plane PO an angle α of at most 30 .- 73 - 2. Light extractor support (100 to 800 ') according to one of the preceding claims, characterized in that the resonance of one or more first optical elements (2, 2', 20, 20 ') is excitable by an electromagnetic wave plane and progressive, monochromatic and wavelength in air XE in the visible spectrum, defined by a magnetic field H polarized parallel to the plane PO and orthogonal to the direction of propagation which is in the plane PO and parallel to the orthogonal projection of L1 on the P0 plane. 3. Light extracting support (600, 700, 600 ', 700') according to one of the preceding claims, characterized in that the first face is structured thus having first blind holes (12), housing at least one the first optical elements (20, 20 '), and preferably the first optical elements thus housed, each comprise a coating (20, 20') of said metal material of the first blind hole, and / or the first face (11) is carrier with a non-metallic, preferably dielectric, structured layer (47, 47 ') and a refractive index of at most 3.5 to 550 nm, said layer having disjoint first holes (47a), said other holes, housing at least partially the first optical elements (20, 20 '), and preferably the first optical elements thus housed each comprise a coating (20) of said metal material of the other hole. 4. Support light extractor (100 to 800 ') according to one of the preceding claims characterized in that it comprises a so-called non-metallic covering layer (40, 40', 40a, 40b, 41, 42, 44, 50) covering the first optical elements (2, 2 ', 20, 20'), preferably forming planarization of the first optical elements in particular which project from the first face, possibly being present between the first optical elements thus also forming a layer said separator, the covering layer being less than 5 μm thick, preferably less than 1 μm. 5. light extracting support (100 to 800 ') according to one of the preceding claims characterized in that it comprises a so-called non-metallic covering layer (40, 40', 40a, 40b, 41, 42, 44, 50) covering the first optical elements (2,2 ', 20, 20'), possibly being present between the first optical elements thus also forming a so-called separating layer, and in that the non-metallic covering layer is based on a material which is chosen from at least one of the following materials: - a glass material, in particular an enamel, - an oxide based on at least one of the following elements: Si, Ti, Zr and their mixtures, in particular a silica , a titanium oxide, an oxide of titanium and zirconium, a zirconium oxide, silica filled with nanoparticles of high refractive index - a transparent conductive oxide, in particular based on at least one of the following elements: Sn, In, Zn and their mixtures - a nitride or oxynitru metal or silicon, - a transparent polymer including sulfur, a PEDOT, a PEDOT / PSS, and / or a stack of said materials. 6. light extracting support (100 to 800 ') according to one of the preceding claims characterized in that it comprises a so-called covering, non-metallic layer (40, 40', 40a, 40b, 41, 42, 44, 50 ), covering the first optical elements (2,2 ', 20, 20'), in particular being present between the first optical elements thus also forming a so-called separating layer, covering layer having a refractive index at 550 nm of at least 1.7, in particular between 1.8 and 1.9 and preferably at most 2. 7. light extracting support (400, 400 ') according to one of the preceding claims characterized in that it comprises a so-called low index separator layer, non-metallic (44) between the first optical elements (2), subscript of refraction less than 1.7 to 550 nm and preferably not more than 1.5, especially a silica-based layer and / or in that the substrate (1) comprises a so-called separating region (12 ') between the first optical elements (2 ') housed in blind holes in the first face. 8. light extracting support (100 to 800 ') according to one of the preceding claims characterized in that it comprises a so-called non-metallic separating layer (40, 40', 40a, 40b, 41, 41 ', 42) between the first optical elements (2) having a refractive index of at least 1.7 to 550 nm and preferably at most 2, especially between 1.8 and 1.9. 9. light extracting support (100d, 400, 100'd, 400 ', 700b) according to one of the preceding claims characterized in that for at least one of the first optical elements, the medium comprises a buffer medium (41, 41 44, 4d), of non-metallic refractive index less than 1.6 at 550 nm, on the first optical element (2,2 ') or even surrounding the first optical element, preferably of thickness at most 100 nm, buffer medium preferably partly above the first face, in particular adjacent to a separating layer between the first optical elements (2) with a refractive index of at least 1.7 to 550 nm . 10. light extracting support (500, 500 ', 500a, 500b) according to one of the preceding claims characterized in that it comprises a metal layer arranged in metal tracks (5a), in particular grid, forming part of a electrode, between the first optical elements (2, 2 ') and / or above the first optical elements in particular on a covering layer, preferably dielectric, on the first optical elements. 11. Light extracting support according to one of the preceding claims characterized in that it comprises a transparent electroconductive non-metallic layer, based on conductive polymer and / or transparent conductive oxide, covering the first optical elements and / or between the first optical elements in particular forming a transparent electrode. 12. Light extracting support (500 ", 500c), in particular light emitted from a surface light source such as an organic electroluminescent system (7), comprising: - a substrate, transparent (1) and dielectric, with a main face (11) , said first face, - light extraction elements (2a, 2'a), said optical elements, disjoint and connected to the first face, each optical element being made of non-metallic material, preferably dielectric, index of refraction of at most 3.5 to 550 nm, characterized in that at least a portion of the optical elements, said first optical elements are three-dimensional each having first, second and third nanometric dimensions, the first dimension, so-called length L1, being the largest and along an axis X1, the second dimension, called thickness E1, being along an axis Z1 perpendicular to X1 and being the smallest of the dimensions perpendicular to X1, la-76- wth, said width Wl, being along an axis Y1 perpendicular to X1 and Z1, with L1 / El> 1.5, and L1 / E1 <20, in that each first optical element is in a metallic medium in that each first optical element is: (a) a nanobutton (2a), with E1e1f1.5E1 and L1> W1, or (b) a nanopalet (2'a), with W11.5E1, and 0.3L1 < W1L1, a plane P1 being formed by two vectors i and j respectively parallel to X1 and Y1 and passing through a point A of the nanopalet closest to the first face opposite the nanopalet, in that L1, El and W1 of each first an optical element being such that each first optical element in said metal medium has a scattering cross section which has a resonance at a wavelength λ, in the air in a range of 380 to 780nm, and in that the substrate has a plane P0, for each nanobatonnet the axis X1 forms with the plane PO an angle α of at most 30 ° and for each nanopalet, the plane P1 forms with the PO at an angle of at most 30 °. 13. light extracting support (500 ", 500c) according to claim 12 characterized in that it comprises a metal layer, in particular forming part of an electrode, forms said metallic medium of the first optical elements (2a, 2'a) and preferably based on silver. 14. Support light extractor (500 ", 500c) according to one of the preceding claims characterized in that the angle is at most 5 ° for the majority of the first optical elements 15. Support light extractor (100 to 800 ') according to one of the preceding claims characterized in that first optical elements (2', 20 ', 2'a) are the nanoboxes which each have the following dimensions: - L1 / E1 ranging from 2 to 5, preferably from 2 to 3 - L1 less than 200 nm, preferably from 30 to 150 nm, El less than 50 nm, preferably from 5 nm to 30 nm, and are preferably symmetrical with revolution following xl. 16. light extracting support (100 'to 800') according to one of the preceding claims characterized in that first optical elements (2 ', - 77 - 20') are the nanoboxes defined by a magnitude X, 1, satisfying the following equation X, 1 m = 127n0 + 160 (L1 / E1) +33 when no is 1 to 2 and L1 / E1 is 2 to 5 and in which X1m is in a range of 380 to 780nm. 17. light extracting support (100 'to 800') according to one of the preceding claims characterized in that first optical elements are nanopalets (2, 20, 2a) which each have the following dimensions: - L1 / E1 ranging from 2 to 5, preferably from 2 to 3, less than 200 nm, preferably from 30 to 150 nm, and less than 50 nm, preferably from 5 nm to 30 nm, and preferably symmetry of revolution according to Zl. 18. light extracting support (100 to 800 ') according to one of the preceding claims, characterized in that the axis X1 of one of the first optical elements (2, 2', 20, 2a, 2'a), which is a nanobead, forms an angle of at least 45 ° and less than 120 ° with the axis X1 of another of the first optical elements (2, 2 ', 20, 2a, 2'a) preferably is a nanobonnet, and preferably between 80 ° and 100 °. 19. light extracting support (100 to 800 ') according to one of the preceding claims characterized in that the first optical elements (2,2', 20, 20 ', 2a, 2'a) are spaced randomly. 20. light extracting support (100 to 800 ') according to one of the preceding claims characterized in that the metallic material of the first optical elements (2, 2', 20, 20 ') is based on silver, pure or alloy or in that the metallic medium of the first optical elements (2a, 2'a) of non-metallic material is based on silver, pure or alloyed. 21. light extracting support (100 to 800 ') according to one of the preceding claims, characterized in that first optical elements made of metallic material correspond to nano-objects (2, 2') reported on the first face (1 , 1 ') directly or on a non-metallic receiving layer (14) bonded to the first face or in that the first optical elements (2a, 2'a) of non-metallic material correspond to nano-objects. 22. OLED device (1000 to 8000 ') incorporating the light extracting support according to one of the preceding claims and comprising an electrode (5, 50, 5a), an organic electroluminescent system (6) on the electrode.