DE102016111330A1 - Light emitting device - Google Patents

Abstract

The invention relates to a light-emitting device which has a first light source (101) and a second light source (102), designed as a refractive element, with a refractive layer (11) and an electroluminescent layer sequence (10).

Description

A light-emitting device is specified.

When surface light sources such as organic light emitting diodes (OLEDs) are integrated together with point light sources such as inorganic light emitting diodes (LEDs) in a housing of a headlight, many new possibilities for designing the headlight arise. However, space problems can arise, especially if additional elements such as lenses are needed to create a suitable radiation field.

At least one object of certain embodiments is to provide a light-emitting device with two light sources.

This object is achieved by an article according to the independent claim. Advantageous embodiments and further developments of the subject matter are characterized in the dependent claims and will become apparent from the following description and the drawings.

In accordance with at least one embodiment, a light-emitting device has a first light source and a second light source. In particular, the first light source and the second light source are spaced from one another in the light-emitting device.

According to a further embodiment, the first light source is a point-light-like light source. As point-light-like light source is hereinafter referred to a light source which can be approximated by an idealized point light source and which has a small spatial extent in relation to their distance to an object to be illuminated. In a point light source, the light spreads in a star shape in all directions or in at least a limited solid angle range. In particular, the first light source may comprise or be an inorganic light emitting diode, an incandescent lamp, a gas discharge lamp or a plurality or combination thereof. For example, the first light source may comprise one or more light-emitting diodes in the form of light-emitting diode chips, which are arranged on a support or in a housing. Light-emitting diode chips usually have an active area of less than a few square millimeters and thus emit light approximately from one point into a limited solid angle range. For adapting the emission spectrum of the first light source, for example in combination with a primary light source such as one or more light emitting diode chips, it may comprise a wavelength conversion material which converts at least a portion of the light emitted by the primary light source into light of a different wavelength. In addition, in addition to or as an alternative to one or more light-emitting diode chips, the first light source may also include or be, for example, a conventional light bulb, a halogen incandescent lamp, a metal halide lamp and / or a xenon gas discharge lamp, which may also be considered approximately as point light sources.

According to a further embodiment, the second light source is designed as a refractive element, in particular for refraction of light of the first light source. Accordingly, the second light source is arranged in the beam path of the first light source and can be illuminated during operation of the first light source thereof. In this case, the light of the first light source strikes a first surface of the second light source facing the first light source. The second light source is in particular designed to be transparent to the light of the first light source. By "transparent" is here and below referred to a layer that is transparent to visible light. In this case, the transparent layer may be clear translucent, or at least partially light-scattering and / or partially light-absorbing, so that the transparent layer may be, for example, diffuse or milky translucent. Particularly preferably, a layer designated here as transparent has the lowest possible absorption and scattering of light. Accordingly, the second light source can be irradiated by the light from the first light source, wherein the second light source acts to refract light when the light from the first light source passes through. Via a second, the first light source remote from the surface of the second light source, the light of the first light source from the second light source exits again. For example, the first and / or the second surface of the second light source may be light refractive.

About the first and second surfaces, the second light source can also emit light itself during operation of the second light source. The second surface of the second light source may in particular face the surroundings, so that the light-emitting device can emit light of only one of these light sources or a mixed light of both light sources via the second surface of the second light source depending on the operation of the first and second light source. In particular, the second light source can therefore emit light itself on the one hand and serve as a light-refracting element and thus for beam shaping for the light emitted by the first light source during operation, so that from the light emitted by the first light source using the refractive element a desired Radiation field can be generated.

The second light source is designed in particular as a surface light source. As a "surface light source" is here and below referred to a light source having a substantially planar shape. The planar shape may be plate-like and thus flat or preferably curved in one or more spatial directions. In particular, the second light source formed as a surface light source as described above two opposite surfaces, which may also be referred to as main surfaces and one of which is designed as Lichtabstrahlfläche the light-emitting device and whose dimensions are larger, preferably at least one or more orders of magnitude greater than a thickness of the second surface light source measured perpendicular to the main surfaces. In other words, the surface light source has at least one light emission surface formed as a luminous surface which can be perceived from the outside, the dimensions of which are greater than a thickness measured perpendicular to the light emission surface.

In particular, the second light source designed as a surface light source can be designed over a large area with respect to the light emission surface and thus with respect to the main surfaces. "Large area" can mean that the main surfaces and thus also the light emission surface are formed with an area of greater than or equal to a few square millimeters, preferably greater than or equal to one square centimeter and particularly preferably greater than or equal to one square decimeter.

According to a further embodiment, the second light source designed as a refractive element has a refractive layer, ie a layer which acts to refract light. For this purpose, the refractive layer has at least one main surface which has a surface structure, by means of which light passing through the refractive layer can be deflected by refraction of light. The refractive main surface of the refractive layer may simultaneously be a previously described surface of the second light source. The refractive layer may in particular be designed as an imaging or non-imaging lens.

Furthermore, the second light source designed as a refractive element has, in addition to the refractive layer, an electroluminescent layer sequence which is set up to generate light during operation of the second light source. The refractive layer and the electroluminescent layer sequence are in particular solid constituents of the second light source and thus connected to the latter in a permanent and preferably non-destructive manner. In particular, the second light source is provided prior to installation in the light-emitting device as a structural unit of the refractive layer with the electroluminescent layer sequence.

According to a further embodiment, the first light source is arranged at a distance from the second light source designed as a refractive element. As a result, it is possible that, during operation of the first light source, light can be emitted to preferably the entire refractive layer or to at least a portion thereof and thereby be refracted by the refractive layer in a desired manner to produce a desired emission characteristic.

According to a further embodiment, the electroluminescent layer sequence has at least one light-emitting layer. The at least one light-emitting layer and thus the electroluminescent layer sequence can be arranged on one side of the refractive layer facing the first light source so that light generated therefrom by the refractive layer can be emitted to the outside during operation of the second light source. Light which is generated during operation of the first light source accordingly passes first through the electroluminescent layer sequence and then through the refractive layer. Alternatively, it may also be possible for the at least one light-emitting layer and thus the electroluminescent layer sequence to be arranged on a side of the refractive layer facing away from the first light source, so that light generated therefrom directly, that is, without, during operation of the second light source to irradiate the refractive layer, can be radiated to the outside.

According to a further embodiment, the electroluminescent layer sequence has an organic functional layer stack. The organic functional layer stack has at least one organic light-emitting layer in the form of an organic electroluminescent layer, which is set up to generate light during operation of the second light source. The organic functional layer stack can also have a plurality of organic light-emitting layers and / or further organic functional layers selected from charge carrier injection layers, charge carrier transport layers and charge carrier blocking layers. The electroluminescent layer sequence can be designed, in particular, as an organic light-emitting diode (OLED).

According to a further embodiment, the electroluminescent layer sequence has two electrodes, between which the organic functional layer stack is arranged. Since the second light source is transparent, the electrodes and the interposed organic are functional layer stack each formed transparent, so that emitted by the first light source light can pass through the second light source.

The electroluminescent layer sequence and the refractive layer may preferably be formed over a large area. Furthermore, the electroluminescent layer sequence may preferably extend over an entire surface of the refractive layer or at least a majority of these. As a result, it may be possible to generate a light emission during operation of the second light source on the entire surface of the refractive layer or at least a large part of it. Furthermore, the electroluminescent layer sequence can also be arranged only on a part of the refractive layer, so that the second light source can have light-emitting and light-refracting regions as well as only light-refracting regions.

According to a further embodiment, the second light source has a substrate on which the organic functional layer stack and the electrodes are applied. In particular, the substrate is transparent and may, for example, comprise or be made of one or more materials made of glass, plastic, ceramic materials and semiconductor materials.

According to a further embodiment, the second light source has an encapsulation which is applied over at least a portion of the organic functional layer stack and the electrodes. In particular, the encapsulation can be applied over the organic functional layer stack and the electrodes as seen from the substrate and enclose the electrodes together with the substrate, the organic functional layer stack and thus against damaging external influences such as moisture and / or damaging gases, for example oxygen and / or Hydrogen sulfide, protect. Alternatively, the encapsulant may surround the organic functional layer stack and the electrodes as well as the substrate, especially if the substrate has a leaking material against damaging environmental influences.

The encapsulation is transparent and can, for example, have or consist of a covering layer or a thin-film encapsulation. The cover layer may in particular comprise glass and / or ceramic and be designed as a glass and / or ceramic cover, for example in the form of a superstrate.

The covering layer can be fixed on the substrate by means of a bonding layer, for example of an adhesive or a glass solder. Furthermore, the covering layer together with the connecting layer can form a cavity over the organic functional layer stack and the electrodes or even have a cavity. Furthermore, an absorbent material (getter), for example of zeolite, can be glued into the cavity in order to bind moisture and / or harmful gases which can penetrate through the bonding layer.

The thin-film encapsulation may comprise barrier layers and / or passivation layers embodied as thin layers, which as a rule may have a thickness of less than or equal to a few 100 nm and which are deposited on the organic functional layer stack and the electrodes in the form of a barrier layer stack. The thin layers preferably comprise an inorganic material such as an oxide, nitride, oxynitride and / or carbide. In addition, a covering layer, for example as a mechanical protection, may be glued to the barrier layer stack

According to a further embodiment, the refractive layer is formed at least as part of the encapsulation and / or of the substrate. In other words, this means that the second light source has a substrate and / or an encapsulation and the substrate and / or the encapsulation has or is a refractive layer. This may in particular also mean that a surface of the substrate and / or a surface of the encapsulation in this case may have a refractive surface structure. The refractive layer may, for example, form the substrate or at least one layer of the substrate. Furthermore, it may also be possible for the refractive layer to form a covering layer of the encapsulation or a part of a covering layer.

According to a further embodiment, the refractive layer is formed as an imaging or, preferably, as a non-imaging lens. The term "lens" includes individual lenses as well as lens arrays of a plurality of interconnected partial lenses. For example, the refractive layer may be at least partially formed as a Fresnel lens. Furthermore, the refractive layer may be at least partially formed as a microlens array with a regular or irregular arrangement of partial lenses. In the event that the refractive layer has a plurality of microlenses arranged at least partially regularly, the refractive layer may be formed as a so-called "fly-eye" lens. In the event that the refractive layer has a plurality of microlenses of different sizes and in an irregular arrangement, the refractive layer may be formed as a scattering plate.

According to a further embodiment, the light-emitting device is at least part of a motor vehicle lamp or a mobile telephone lamp.

Because the refractive layer is integrated together with the electroluminescent layer in the second light source, it may be possible for the refractive layer to have virtually no influence on the emission characteristic of the electroluminescent layer and thus of the second light source, but has a great influence on the emission characteristic the first light source. In addition, since the second light source is used as a lens for the first light source, a light emitting device formed therefrom can be made compact and / or the density of luminous elements can be increased. Furthermore, an increased freedom of design can result.

Furthermore, the second light source can be used to "hide" the first light source underneath. This may be possible in particular in the case of a non-imaging optics as a refractive element. For example, in the case of at least one light-emitting diode with a wavelength conversion substance as the first light source, an undesired color impression caused by the wavelength conversion substance can be reduced or avoided in the switched-off state of the first light source. In addition, for example, the second light source can be operated with low brightness, so that the second light source can outshine such an undesired color impression. In addition, this can be another design element, for example when used in a mobile phone, can be achieved.

Further advantages, advantageous embodiments and developments emerge from the embodiments described below in conjunction with the figures.

Show it:

1A and 1B schematic representations of embodiments of light-emitting devices with a first and a second light source,

2A to 3B schematic representations of second light sources for light emitting devices according to further embodiments,

4A to 4K schematic representations of refractive elements according to further embodiments and

5A and 5B schematic representations of a motor vehicle lamp and a mobile phone with light-emitting devices according to further embodiments.

In the exemplary embodiments and figures, identical, identical or identically acting elements can each be provided with the same reference numerals. The illustrated elements and their proportions with each other are not to be regarded as true to scale, but individual elements, such as layers, components, components and areas, for better presentation and / or better understanding may be exaggerated.

In 1A is an embodiment of a light-emitting device 100 shown a first light source 101 and spaced therefrom a second light source 102 having. The light-emitting device 100 For example, it can be at least a part of a motor vehicle lamp or a mobile phone lamp.

Depending on the function and application of the light-emitting device 100 can be the first and second light source 101 . 102 emit the same or different light.

The first light source 101 is a spot light type light source comprising or made of an inorganic light emitting diode, an incandescent lamp, a gas discharge lamp or a plurality or combination thereof. For example, the first light source 101 have one or more light-emitting diodes in the form of light-emitting diode chips, which are arranged on a support or in a housing. The first light source 101 may additionally comprise a wavelength conversion substance which can convert at least a portion of the light emitted by the one or more light emitting diode chips into light of a different wavelength, such that the light of the first light source 101 can have a desired lighting and color impression. For example, the first light source 101 emit white light. In addition, the first light source 101 For example, a conventional light bulb, a halogen incandescent lamp, a metal halide lamp and / or a xenon gas discharge lamp or be it.

The second light source 102 is transparent and in the beam path of the first light source 101 arranged. In particular, the second light source 102 designed as a refractive element. This allows the second light source 102 on the one hand as a lens for that of the first light source 101 serve radiated light. On the other hand, the second light source 102 formed as a surface light source and can as from the first light source 101 be used separate light source. The second light source 102 has an electroluminescent layer sequence 10 for the light emission properties as well as a refractive layer 11 for the light-breaking properties. In the embodiment shown, the refractive layer 11 on one of the first light source 101 opposite side of the electroluminescent layer sequence 10 arranged. The electroluminescent layer sequence 10 can be designed in particular as an OLED.

The refractive layer 11 has a major surface with a surface texture through which the through the refractive layer 11 passing light can be deflected by refraction. The refractive main surface of the refractive layer 11 that from the first light source 101 is arranged facing away from forms in the embodiment shown at the same time a main surface of the second light source 102 about which the light emitting device 100 can emit light to the environment during operation.

The refractive layer 11 can be designed in particular as an imaging or non-imaging lens. By way of example only, the refractive layer 11 formed in the embodiment shown as a Fresnel lens. By the spaced arrangement of the first light source 101 from the second light source 102 as well as by the immediate proximity of the electroluminescent layer sequence 10 the second light source 102 to the refractive layer 11 It may be possible for that from the first light source 101 In operation, light emitted from the refractive layer 11 is refracted in a desired manner to produce a desired radiation characteristic, while the refractive layer 11 almost no influence on the emission characteristics of the electroluminescent layer sequence 10 and on the second light source 102 may have radiated light, leaving the second light source 102 one from the refractive layer 11 may have substantially independent radiation characteristics.

The electroluminescent layer sequence 10 and the refractive layer 11 are fixed components of the second light source 102 , This means that the electroluminescent layer sequence 10 and the refractive layer 11 permanently and preferably not non-destructively separable connected. In particular, the second light source becomes 102 before installation in the light-emitting device 100 as a structural unit of the refractive layer 11 with the electroluminescent layer sequence 10 provided.

Detailed constructions of the second light source 102 are in connection with the 2A to 3B described. Embodiments of the refractive layer 11 are in connection with the 4A to 4K described.

In 1B is another embodiment of a light emitting device 100 shown in which the refractive layer 11 Compared to the previous embodiment on one of the first light source 101 facing side of the electroluminescent layer sequence 10 is arranged. The refractive layer 11 has, as in the previous embodiment, a main surface having a surface structure through which through the refractive layer 11 passing light can be deflected by refraction, wherein the light-refracting surface of the refractive layer 11 in this embodiment, the first light source 101 is arranged facing. The light emission of the light-emitting device 100 thus takes place from a main surface of the second light source 102 not through the refractive layer 11 is formed. Light of the first light source 101 can be characterized by the refractive layer 11 be broken in a desired manner while light from the second light source 102 can be radiated unhindered to the outside.

Furthermore, it may also be possible, according to a combination of in the 1A and 1B shown embodiments, two refractive layers 11 provide, between which the electroluminescent layer sequence 10 arranged and durable with the refractive layers 11 connected is. The refractive layers 11 may be the same or similar or different in this case.

In the 2A to 3B are exemplary embodiments of second light sources 102 each showing an electroluminescent layer sequence 10 and a refractive layer 11 exhibit. The refractive layer 11 is in each case shown as an integral part of the second light source in the embodiments shown 102 educated.

The electroluminescent layer sequence 10 indicates in the embodiments shown between two transparent electrodes 1 . 2 an organic functional layer stack 3 with at least one organic light emitting layer 4 on. Over the electrodes 1 . 2 and the organic functional layer stack 3 is an encapsulation 5 arranged along with a substrate 6 on which the electrodes 1 . 2 and the organic functional layer stack 3 are applied, the electrodes 1 . 2 and the organic functional layer stack 3 surrounds and protects against damaging external influences. Both the encapsulation 5 as well as the substrate 6 are like the electrodes 1 . 2 and the organic functional layer stack 3 transparent. The substrate 1 can For example, one or more of the following materials: glass, plastic, semiconductor material, ceramic.

The electroluminescent layer sequence 10 and thus the second light source designed as a refractive element 102 is in particular designed as an organic light-emitting diode (OLED), which operates light through the transparent electrodes 1 . 2 radiates. The organic functional layer stack 3 may comprise layers of organic polymers, organic oligomers, organic monomers, organic small, non-polymeric molecules ("small molecules") or combinations thereof. As materials for the organic light-emitting layer 4 For example, materials having radiation emission due to fluorescence or phosphorescence, such as polyfluorene, polythiophene or polyphenylene or derivatives, compounds, mixtures or copolymers thereof, are suitable. The organic functional layer stack 3 may be in addition to the at least one organic light emitting layer 4 Contain charge carrier transport layers and / or charge carrier blocking layers such as hole transport layers, electrode transport layers, hole blocking layers, electron blocking layers and other organic functional layers.

As materials for the transparent electrodes 1 . 2 For example, a transparent conductive oxide (TCO) may be used. TCOs are transparent, conductive materials, typically metal oxides such as zinc oxide, tin oxide, cadmium oxide, titanium oxide, indium oxide, indium tin oxide (ITO) or aluminum zinc oxide (AZO). In addition to binary metal-oxygen compounds such as ZnO, SnO ₂ or In ₂ O _3, ternary metal-oxygen compounds, such as Zn ₂ SnO _4, CdSnO _3, ZnSnO _3, MgIn ₂ O _4, GaInO _3, Zn ₂ In ₂ O ₅ or In ₄ Sn ₃ O ₁₂ or mixtures of different transparent conductive oxides to the group of TCOs. Furthermore, the TCOs do not necessarily correspond to a stoichiometric composition and may also be p- or n-doped. Furthermore, at least one or both of the transparent electrodes 1 . 2 a metal layer with a metal or an alloy, for example with one or more of the following materials: Ag, Pt, Au, Mg, Ag: Mg. The metal layer in this case has a thickness small enough to be at least partially transmissive to light, for example a thickness of less than or equal to 50 nm or less than or equal to 20 nm. Furthermore, at least one or both of the transparent electrodes 1 . 2 Or silver nanowires (SNW). In addition, at least one or both of the transparent electrodes 1 . 2 Also include or be a metal grid in combination with a highly conductive hole injection layer or a conductive polymer. The transparent electrodes 1 . 2 may also comprise or be combinations of layers with said materials.

The encapsulation 5 As described above, it is suitable for forming a barrier to atmospheric substances, in particular to moisture and oxygen and / or to other harmful substances such as corrosive gases, for example hydrogen sulphide. Particularly preferred may be the encapsulation 5 a thin-film encapsulation 50 exhibit. The encapsulation 5 may for this purpose have one or more layers, each having a thickness of less than or equal to a few 100 nm. In particular, the thin-film encapsulation 50 have or consist of thin layers, which are applied for example by means of an atomic layer deposition ("atomic layer deposition", ALD). Suitable materials for the layers of thin-film encapsulation 5 For example, alumina, zinc oxide, zirconia, titania, hafnia, lanthana, tantalum oxide. For example, the thin-film encapsulation 50 a layer sequence having a plurality of the thin layers, each having a thickness between an atomic layer and 10 nm, wherein the boundaries are included. Alternatively or in addition to ALD-produced thin films, thin-film encapsulation can be used 50 at least one or a plurality of further layers, ie in particular barrier layers and / or passivation layers, which is deposited by thermal vapor deposition or by a plasma-assisted process, such as sputtering or plasma-enhanced chemical vapor deposition (PECVD). Suitable materials for this may be the aforementioned materials as well as silicon nitride, silicon oxide, silicon oxynitride, silicon carbide, indium tin oxide, indium zinc oxide, aluminum-doped zinc oxide, aluminum oxide and mixtures and alloys of said materials. The one or more further layers may, for example, each have a thickness between 1 nm and 5 μm, and preferably between 1 nm and 400 nm, the limits being included.

The encapsulation 5 also has a cover layer 51 on that on the thin-film encapsulation 50 is applied and provide a mechanical protection for the thin-film encapsulation 50 can form. The cover layer 51 For example, by means of a bonding layer, such as an adhesive layer, on the Dünnfilmverkapselung 50 be attached. The cover layer 51 is transparent and has, for example, a glass, a ceramic, a plastic or a combination thereof.

In the embodiment shown, the cover layer 51 still as a refractive layer 11 formed and has a corresponding surface structure, at the same time a main surface of the second light source 102 forms.

In 2 B is another embodiment of a second light source 102 shown encapsulation compared to the previous embodiment 5 that passes through one over the electrodes 1 . 2 and the organic functional layer stack 3 on the substrate 6 attached cover layer 51 is formed. For this purpose, it is circumferential around the organic functional layer stack 3 a tie layer 52 applied, which may be formed for example by an adhesive or a glass solder and which together with the cover layer 51 a cavity above the substrate 6 forms, in which the electrodes 1 . 2 and the organic functional layer stack 3 are arranged.

Furthermore, it may also be possible for the cover layer 51 itself has a cavity, so that the thickness of the bonding layer 52 can be reduced. Furthermore, an absorbent material (getter), for example of zeolite, can be glued into the cavity in order to bind moisture and / or harmful gases which can penetrate through the bonding layer. As in the previous embodiment, the cover layer 51 transparent and has, for example, a glass, a ceramic, a plastic or a combination thereof, wherein the cover layer 51 is preferably formed self-supporting. Furthermore, the cover layer 51 the encapsulation 5 also as in the previous embodiment as a refractive layer 11 educated.

In 3A is a second light source 102 according to another embodiment, wherein in comparison to the two previous embodiments, the substrate 6 as a refractive layer 11 is trained. The encapsulation 5 can be like in conjunction with the 2A and 2 B includes a thin-film encapsulation and / or a covering layer or be therefrom.

In 3B is another embodiment of a second light source 102 shown in which the refractive layer 11 on the organic functional layer stack 3 opposite side of the substrate 6 is applied. For example, the refractive layer, which may be of glass, plastic, ceramic or a combination thereof, may be adhered to the substrate.

The in the 2A to 3B The embodiments shown can also be combined in such a way that both on the encapsulation side and on the substrate side a refractive layer 11 is provided according to the embodiments shown, so that the second light source 102 two refractive layers 11 may have, between the electroluminescent layer sequence 10 is arranged.

In the 4A to 4K are in plan embodiments of the refractive layer 11 and in particular the surface structure of the refractive layer 11 shown. The refractive layer 11 according to the embodiment of the 4A has, as already described in the previous embodiments, a surface structure in the form of a Fresnel lens. The refractive layer 11 can, as appropriate, then the second light source 102 total, have a circular cross-section shown by way of example.

In 4B is a refractive layer 11 which purely by way of example has a square cross section and whose surface structure is formed by a plurality of microlenses. Such a structure formed by a microlens array can also be referred to as "fly eye".

In the 4C to 4K Further surface structures are shown, which are formed by different geometric structures and sizes, for example, polygons of the same shape and size ( 4C ) or polygons of different sizes ( 4D to 4J ). The structures may also additionally have substructures, such as in the 4C . 4I and 4J is indicated. Furthermore, the surface structure may also have completely random structures, as in 4K is indicated. Depending on the size distribution and arrangement of the (sub-) structures of the surface structure of the refractive layer 11 For example, it may be more of a microlens-like character or more of a scatter plate-like character.

The surface structures shown can also be combined so that the refractive layer 11 For example, some may have a Fresnel lens-like structure and / or partially a microlens-like and / or partially a scatter plate-like structure. As an alternative to the cross-sectional shapes shown, in connection with the surface structures shown, other cross-sectional shapes of the refractive layer are also possible 11 and thus the second light source 102 possible, for example in the form of a circle, an ellipse, an arbitrary polygon or a freeform surface.

In 5A is an embodiment of a motor vehicle lamp 110 shown a light-emitting device 100 according to one of the previous embodiments in a suitable housing 103 having. By combining a described first light source 101 with a second light source 102 With light-emitting and light-refracting properties, a compact design with a high freedom of design with regard to possible radiation characteristics can be achieved.

In 5B is a mobile phone 111 shown that a light emitting device 100 formed mobile radio lamp 112 which can be used, for example, as a flash for a photographing function and / or as a continuous lighting for a film recording and / or flashlight function. As described above, in this case, the second light source may in particular be suitable for reducing or covering an undesired color impression of the first light source in an off state thereof. Furthermore, different lighting scenarios can be realized.

The exemplary embodiments described in conjunction with the figures can also be combined with one another according to further exemplary embodiments. Furthermore, the embodiments may alternatively or additionally have features as described in the general part.

The invention is not limited by the description based on the embodiments of these. Rather, the invention encompasses any novel feature as well as any combination of features, including in particular any combination of features in the claims, even if this feature or combination itself is not explicitly stated in the patent claims or exemplary embodiments.

LIST OF REFERENCE NUMBERS

1, 2

 electrode

3

 organic functional layer stack

4

 organic light-emitting layer

5

 encapsulation

6

 substratum

10

 Electroluminescent layer sequence

11

 refractive layer

50

 thin-film

51

 covering

52

 link layer

100

 Light emitting device

101

 first light source

102

 second light source

103

 casing

110

 Automotive lamp

111

 mobile phone

112

 Mobile phone lamp

Claims (16)

Light emitting device comprising - a first light source ( 101 ) and - designed as a refractive element second light source ( 102 ) with a refractive layer ( 11 ) and an electroluminescent layer sequence ( 10 ). Light emitting device according to claim 1, wherein the electroluminescent layer sequence ( 10 ) an organic functional layer stack ( 3 ) with at least one organic light-emitting layer ( 4 ) having. Light-emitting device according to one of the preceding claims, wherein the organic functional layer stack ( 3 ) between two transparent electrodes ( 1 . 2 ) is arranged. A light-emitting device according to claim 3, wherein the refractive layer ( 11 ) at least as part of an encapsulation ( 5 ) or a substrate ( 6 ) for the organic functional layer stack ( 3 ) and the electrodes ( 1 . 2 ) is trained. Light-emitting device according to one of the preceding claims, wherein the electroluminescent layer sequence ( 10 ) is formed as an organic light-emitting diode. Light-emitting device according to one of the preceding claims, wherein the organic functional layer stack ( 3 ) over a large area on the refractive layer ( 11 ) is trained. Light-emitting device according to one of the preceding claims, wherein the refractive layer ( 11 ) is formed as a non-imaging lens. Light-emitting device according to one of the preceding claims, wherein the refractive layer ( 11 ) is at least partially formed as a Fresnel lens. Light-emitting device according to one of the preceding claims, wherein the refractive layer ( 11 ) is at least partially formed as Mirkolinsen array. Light-emitting device according to one of the preceding claims, wherein the refractive layer ( 11 ) is at least partially formed as a scattering plate. A light emitting device according to any one of claims 1 to 10, wherein the refractive layer ( 11 ) on one of the first light source ( 101 ) facing side of the electroluminescent layer sequence ( 10 ) is arranged. A light emitting device according to any one of claims 1 to 10, wherein the refractive layer ( 11 ) on one of the first light source ( 101 ) side facing away from the electroluminescent layer sequence ( 10 ) is arranged. Light-emitting device according to one of the preceding claims, wherein the first light source ( 101 ) from the second light source ( 102 ) is spaced. Light-emitting device according to one of the preceding claims, wherein the first light source ( 101 ) is a point light-like light source. A light emitting device according to claim 14, wherein the first light source ( 101 ) has an inorganic light emitting diode, an incandescent lamp and / or a gas discharge lamp. A light-emitting device according to any one of the preceding claims, wherein the light-emitting device is at least part of a motor vehicle lamp or a mobile telephone lamp.

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