WO2018216995A1

WO2018216995A1 - Rotary polarized light emitting body, rotary polarized light emitting device, and manufacturing method therefor

Info

Publication number: WO2018216995A1
Application number: PCT/KR2018/005812
Authority: WO
Inventors: 김재훈; 이유진; 유창재
Original assignee: 한양대학교 산학협력단
Priority date: 2017-05-23
Filing date: 2018-05-23
Publication date: 2018-11-29

Abstract

A display is provided. A display according to one embodiment of the present invention comprises: a first electrode; a second electrode; and a light-emitting layer, disposed between the first electrode and the second electrode, for emitting first light in a polarized state rotating in a first direction toward the first electrode and emitting second light in a polarized state rotating in a second direction which is a reverse direction of the first direction; and a polarizing layer, disposed in a light emitting direction on the basis of the first electrode, for passing light that rotates in the first direction, wherein the second light is reflected by the second electrode and has a polarization state rotating in the first direction, and passes through the polarizing layer, and wherein as external incident light passes through the polarizing layer, the external incident light has a polarization state rotating in the first direction, and then the external incident light having a polarization state rotating in the first direction is reflected by the second electrode and has a polarization state rotating in the second direction such that the external incident light is blocked from being emitted to the outside by the polarizing layer.

Description

Rotating polarized light emitter and rotating polarized light emitting device

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a light emitting device and a display rotating polarizing light emitting device and a rotating polarizing light emitting device and a method of manufacturing the same. More particularly, the present invention relates to a light emitting device and a display that minimize reflection by external light and maximize light efficiency.

For example, an organic light emitting device is a display device that employs an electroluminescence phenomenon of an organic material. In the organic light emitting device, an organic light emitting material is disposed between an anode electrode and a cathode electrode, and an exciton generated by combining electrons and holes in the light emitting layer by an electric current flowing between the anode electrode and the cathode electrode is in an excited state from the excited state. Light is generated by the energy generated when falling.

In the case of the display, in order to prevent the light incident to the organic light emitting element from being reflected from the organic light emitting element and emitted to the outside, the phase difference film and the polarizing plate are organic light-emitting as shown in Patent Publication No. 2013-075525. Place on the device.

However, in the prior art, an expensive retardation film may cause a production cost problem. In addition, due to the polarizing plate, part of the light emitted from the organic light emitting layer may be blocked by the polarizing plate, thereby reducing visibility and luminous efficiency.

Accordingly, the inventors have invented a display that minimizes the reflection of external light while maximizing the efficiency of light emitted from the light emitting layer.

One technical problem to be solved by the present invention is to provide a rotation polarization light emitting body and a rotation polarization light emitting device for minimizing external light reflection and a method of manufacturing the same.

Another technical problem to be solved by the present invention is to provide a rotating polarizing light emitting body and a rotating polarizing light emitting device having excellent visibility by maximizing the light efficiency that light emitted from the light emitting layer is provided to a viewer, and a manufacturing method thereof.

One technical problem to be solved by the present invention is to provide a rotation polarization light emitting body and a rotation polarization light emitting device that provides a high rotation polarization ratio and a manufacturing method thereof.

The technical problem to be solved by the present invention is not limited by the aforementioned technical problem.

The rotation polarization light emitting device according to an embodiment of the present invention is disposed between a first electrode disposed in a light emission direction, a second electrode facing the first electrode, and disposed between the first electrode and the second electrode. A second light having a polarization state that emits a first light having a polarization state that rotates in a first direction toward the first electrode, and that rotates in a second direction that is opposite to the first direction toward the second electrode; It may include a light emitting layer and a polarizing layer which is disposed in the light output direction with respect to the first electrode, and passes through the light rotating in the first direction.

According to one embodiment, the second light is reflected by the second electrode, has a polarization state that rotates in the first direction passes through the polarization layer, the external incident light passes through the polarization layer Accordingly, the external incident light having the polarization state rotating in the first direction and having the polarization state rotating in the first direction is reflected by the second electrode to have the polarization state rotating in the second direction. Thus, the emission to the outside by the polarizing layer can be blocked.

According to one embodiment, the first direction and the second direction is a direction defined on the basis of the viewpoint of looking at the second position from the first position on the light propagation path from the first position to the second position. Can be.

According to an embodiment, the light emitting layer has a polarization state in which the first light emitted from the light emitting layer rotates in the first direction toward the first electrode, and the light emitted from the light emitting layer The chiral material may be configured to adjust the layer twist angle of the light emitting molecules of the light emitting layer such that the second light has a polarization state rotating in the second direction toward the second electrode.

According to one embodiment, the layer twist angle may be less than 180 degrees.

In another embodiment, a rotation polarization light emitting device is disposed between a first electrode, a second electrode facing the first electrode and positioned in a light emission direction, and disposed between the first electrode and the second electrode. Emitting a first light having a polarization state that rotates in a first direction toward the second electrode, and a second light having a polarization state that rotates in a second direction opposite to the first direction toward the first electrode; The light emitting layer may be disposed in the light emitting direction based on the second light emitting layer and the second electrode, and may include a polarizing layer through which light rotating in the first direction passes.

According to the embodiment, the second light is reflected by the first electrode, has a polarization state that rotates in the first direction and passes through the polarization layer, and external incident light passes through the polarization layer, The external incident light having the polarization state rotating in the first direction and having the polarization state rotating in the first direction is reflected by the first electrode and has the polarization state rotating in the second direction. Output to the outside may be blocked by the polarizing layer.

According to an embodiment, the first direction and the second direction may be directions defined based on a viewpoint of looking at the second position from the first position on a light traveling path from the first position to the second position. Can be.

According to an embodiment, the light emitting layer has a polarization state in which the first light emitted from the light emitting layer rotates in the first direction toward the second electrode, and the first light emitted from the light emitting layer 2 may include a chiral material that adjusts the layer twist angle of the light emitting molecules of the light emitting layer so that light has a polarization state rotating in the second direction toward the first electrode.

According to an embodiment, the layer twist angle may be 180 degrees or less.

The rotation polarization light emitting device according to another embodiment of the present invention, the first electrode, the second electrode facing the first electrode, the port or starboard light disposed outside the first electrode or the outside of the second electrode selectively And a light emitting layer disposed between the first electrode and the second electrode, the light emitting layer including a chiral material, wherein the light generated from the light emitting layer is the polarizing layer. Polarized port or starboard to pass through, and the light intensity generated in the light output layer measured outside the polarizing layer is. The light emitting layer including the chiral material may be stronger than the light emitting layer including the chiral material.

According to an embodiment, the light emitting layer may include light emitting molecules, and the light emitting molecules may be aligned in a specific direction to emit linearly polarized light.

The rotationally polarized light emitter according to another embodiment of the present invention may include non-chiral light emitting molecules and a dopant for stacking the light emitting molecules in a spiral structure by providing a twist angle in the thickness direction of the light emitting molecules.

According to an embodiment, the dopant may provide a helical twisting power to the light emitting molecules to rotate the light emitting molecules at the torsion angle.

According to another aspect of the present invention, there is provided a method of manufacturing a rotating polarization light emitting device, comprising: forming a first electrode, and forming a light emission layer including a light emitting layer including light emitting molecules and chiral dopants on the first electrode; And forming a second electrode on the light emitting layer, wherein in the forming of the light emitting layer, the chiral dopant adjusts the layer twist angle of the light emitting molecules to emit light from the light emitting layer. The g-factor of the light can be controlled.

According to an embodiment, the forming of the light emitting layer may include controlling at least one of controlling the layer twist angle, controlling the refractive index of the light emitting layer, and controlling the light emitting zone of the light emitting layer. The distance from one of the first and second electrodes may be defined as a reference.

According to an embodiment, the layered twist angle may be controlled to 180 degrees or less.

According to an embodiment, when the first electrode is a transparent electrode and the second electrode is a reflective electrode, the emission zone of the emission layer may be controlled to be close to the second electrode.

According to an embodiment, the light emitting zone of the light emitting layer may be controlled to be close to the second electrode within 20% of the thickness of the light emitting layer.

According to an embodiment, the refractive index of the light emitting layer may be controlled according to the position of the light emitting zone of the light emitting layer.

In one embodiment, a rotation polarization light emitting device is disposed between a first electrode, a second electrode facing the first electrode, the first electrode and the second electrode, and toward the first electrode. Light that emits first light having a polarization state that rotates in a first direction, and emits second light having a polarization state that rotates in a second direction opposite to the first direction toward the second electrode An emission layer may include a polarization layer disposed in a light emission direction based on the first electrode and configured to pass light rotating in the first direction.

Accordingly, the second light is reflected by the second electrode, has a polarization state rotating in the first direction, passes through the polarization layer, and external incident light passes through the polarization layer. The external incident light having the polarization state rotating in the first direction and having the polarization state rotating in the first direction is reflected by the second electrode and has the polarization state rotating in the second direction. Output to the outside may be blocked by the polarizing layer. Therefore, the display according to the embodiment of the present invention can maximize light efficiency while minimizing reflection by external light.

A rotation polarization light emitting device and a method of manufacturing the same according to an embodiment of the present invention can provide a high rotation polarization ratio.

The rotation polarization light emitting device and the method of manufacturing the same according to an embodiment of the present invention can minimize external light reflection.

According to an embodiment of the present invention, a rotation polarization light emitting device and a method of manufacturing the same provide a rotation polarization light emitting device having excellent visibility by maximizing the light efficiency of light emitted from a light emitting layer to a viewer and a method of manufacturing the same. There is.

The effects of the present invention are not limited by the effects of the above-mentioned invention.

1 is a partial cross-sectional view for describing a display according to a first embodiment of the present invention.

2 is a diagram for describing a spiral stacked structure of light emitting molecules according to an exemplary embodiment of the present invention.

3 is a view for explaining an operation example of the display according to the first embodiment of the present invention.

4 is a view for explaining a first modified example of the first embodiment of the present invention.

5 is a view for explaining a second modified example of the first embodiment of the present invention.

6 is a view for explaining a third modified example of the first embodiment of the present invention.

7 is a view for explaining a fourth modified example of the first embodiment of the present invention.

8 is a view for explaining the use of the eleventh embodiment of the present invention and modified examples thereof.

9 is a partial cross-sectional view for describing a display according to a second embodiment of the present invention.

10 is a view for explaining an operation example of the display according to the second embodiment of the present invention.

11 is a view for explaining a first modified example of the second embodiment of the present invention.

12 is a view for explaining a second modified example of the second embodiment of the present invention.

13 is a view for explaining a third modified example of the second embodiment of the present invention.

14 is a view for explaining an application example of the second embodiment and modified examples thereof.

15 is a view for explaining the effect of the heat treatment process according to an embodiment of the present invention on the formation of the spiral structure of the light emitting molecules.

16 is a view for explaining an effect according to one embodiment of the present invention.

17 is a view for explaining a method of manufacturing a rotation polarization light emitting device according to an embodiment of the present invention.

18 to 20 are graphs showing rotation polarization ratios according to twist angles of light emitting molecules according to an exemplary embodiment of the present invention.

21 is a graph illustrating a rotation polarization ratio for each position of a light emitting zone according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical idea of the present invention is not limited to the exemplary embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete, and that the spirit of the present invention can be sufficiently delivered to those skilled in the art.

In the present specification, when a component is mentioned to be on another component, it means that it may be formed directly on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical contents.

In addition, in various embodiments of the present specification, terms such as first, second, and third are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Thus, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes its complementary embodiment. In addition, the term 'and / or' is used herein to include at least one of the components listed before and after.

In the specification, the singular encompasses the plural unless the context clearly indicates otherwise. In addition, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, element, or combination thereof described in the specification, and one or more other features or numbers, steps, configurations It should not be understood to exclude the possibility of the presence or the addition of elements or combinations thereof. In addition, the term "connection" is used herein to mean both indirectly connecting a plurality of components, and directly connecting.

In the present specification, the display may mean a rotation polarization light emitting device.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a partial cross-sectional view for describing a display according to a first embodiment of the present invention. The display according to the first embodiment of the present invention may be applied to a bottom emission display device, and the display according to the second embodiment of the present invention to be described below may be applied to a top emission display device. .

Referring to FIG. 1, the display 100 according to the first embodiment of the present invention includes a first electrode 110, a second electrode 170, a light emission layer 105, and a polarization layer 180. Can be done. In this case, each configuration may be stacked in the order of the polarization layer 180, the first electrode 110, the light emission layer 100, and the second electrode 170 in the y 'to y direction, and the light exit. The light emitted from the layer 105 is provided to the viewer in the y 'direction, so that the bottom emission type display can be implemented. Hereinafter, each configuration will be described in detail.

The first electrode 110 may be an anode electrode that provides holes to the light exit layer 105. The first electrode 110 may be formed of a transparent electrode to transmit light.

If the work function of the first electrode 110 is smaller than the work function of the second electrode 170, the first electrode 110 may correspond to the cathode electrode. Hereinafter, for convenience of description, it will be assumed that the first electrode 110 is an anode electrode.

The first electrode 110 may be formed as a shared electrode to be shared between neighboring pixels, or may be formed by dividing each pixel. Hereinafter, for convenience of description, it will be assumed that the first electrode 110 is a split electrode. In this case, the first electrode 110 may be individually controlled for each pixel.

Although not shown, a different configuration may be provided between the first electrode 110 and the polarization layer 180. For example, a substrate, an active element formed on the substrate, and the like may be provided between the first electrode 110 and the polarization layer 180. In this case, the substrate may be made of not only a glass substrate but also at least one of polyethylene terephthalate (PET), polyethyleneennaphthalate (PEN), and polyimide (PI).

The light emitting layer 105 may mean a layer that generates light and emits light. For example, the light emitting layer 105 may be formed of one material of organic molecules or quantum inorganic molecules as a material for generating and emitting light. Hereinafter, for the convenience of description, it will be assumed that the light emitting layer 105 is an organic light emitting layer.

The light exit layer 105 is a layer stacked in the order of the hole injection layer 120, the hole transport layer 130, the light emitting layer 140, the electron injection layer 150, and the electron transport layer 160 from y ′ to the y direction. Can be made. However, of course, the light emitting layer 105 may be made of fewer or more layers.

The light emitting layer 105 is disposed between the first electrode 110 and the second electrode 170 and has a polarization state that rotates in a first direction toward the first electrode 110. One light may be emitted, and the second light may be emitted toward the second electrode 170 having a polarization state rotating in a second direction opposite to the first direction.

In this case, the first direction and the second direction may be directions defined based on a viewpoint of looking at the second position from the first position on a light propagation path from the first position to the second position.

In addition, the polarization state rotating in the first direction or the second direction may be understood as a concept including circularly polarized or elliptically polarized light. Circular polarization means that in the light traveling in the z-axis direction, when the sum of the x-axis and y-axis magnetic field vectors continues to change in a circular shape in the plane of incidence, that is, the amplitudes of the two components of the x-axis and y-axis magnetic fields are exactly This may mean that the phase difference is 90 °. Elliptical polarization is any case other than linearly and circularly polarized light. That is, when the synthesized magnetic field vector rotates and its size changes, the polarization state draws an ellipse, which can be defined as an elliptical polarization.

Hereinafter, for convenience of description, when the light is directed from the first position to the second position, when the light is viewed from the first position to the second position, the polarization state of rotating the light rotating in the counterclockwise direction in the first direction is described. The branch is defined as light, and alternatively, light rotating in the clockwise direction is defined as light having a polarization state rotating in the second direction.

The hole injection layer (HTL) 120 is formed on the first electrode 110 and may perform a function of smoothly injecting holes. To this end, the hole injection layer 120, MTDATA (4,4 ', 4 "-tris (3-methylphenylphenylamino) triphenylamine), CuPc (copper phthalocyanine), PEDOT / PSS (poly (3,4-ethylenedioxythiphene, polystyrene) sulfonate) and NPD (N, N-dinaphthyl-N, N'-diphenylbenzidine) may be formed of at least one material, but is not limited thereto.

The hole transporting layer 130 (HTL) is formed on the hole injection layer 120, it may perform a function to facilitate the transport of holes. To this end, the hole transport layer 130 is, for example, NPD (N, N-dinaphthyl-N, N'-diphenylbenzidine), TPD (N, N'-bis- (3-methylphenyl) -N, N ' -bis- (phenyl) -benzidine), s-TAD and MTDATA (4,4 ', 4 "-Tris (N-3-methylphenyl-N-phenyl-amino) -triphenylamine) It is not limited to this.

The hole injection layer 120 and the hole transport layer 130, vacuum deposition, spin coating, casting, LB (Langmuir-Blodgett), inkjet printing, laser printing, laser thermal thermal imaging (Laser induced thermal imaging) , LITI) and the like can be formed using various methods.

In the emission layer 140, holes supplied through the hole transport layer 130 and electrons supplied through the electron transport layer 150 may be recombined to generate light.

The light emitting layer 140 may be composed of light emitting molecules. The light emitting molecules can have a non-chiral shape, for example. In another aspect, the non-chiral light emitting molecule may have a rodlike shape. In another aspect, the light emitting molecules can be conjugated polymers. In another aspect, the light emitting molecules may be a non-chiral polymer.

Hereinafter, the light emitting molecules may be referred to as organic molecules or organic light emitting molecules.

The light emitting molecules may be classified according to molecular weight. For example, the light emitting molecules may also be low molecular light emitting molecules, or may be high molecular light emitting molecules. Specifically, the polymer light emitting molecule may be made of at least one of poly (9,9-dioctylfluorene-co-benzothiadiazole; F8BT) and poly (9,9-dioctyl-2,7-fluorene; PFO). The low molecular weight molecule may be made of at least one material of KSW-1-14 and KSW-1-20.

The light emitting molecules of the light emitting layer 140 may be defined according to the wavelength of light emitted from the light emitting layer 140. When the light emitting layer 140 generates red light, the light emitting layer 140 is a host including, for example, CBP (carbazole biphenyl) or mCP (1,3-bis (carbazol-9-yl)) Substances, including PIQIr (acac) (bis (1-phenylisoquinoline) acetylacetonate iridium), PQIr (acac) (bis (1-phenylquinoline) acetylacetonate iridium), PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum ) May be made of a phosphorescent material including at least one dopant, or alternatively, may be made of a fluorescent material including PBD: Eu (DBM) 3 (Phen) or perylene. In the case of generating the light emitting layer 140, TCTA (Tris (4-carbazoyl-9-ylphenyl) amine), CBP (4,4'-Bis (Ncarbazolyl) -1,1'-biphenyl), Balq (Bis (8-hydroxy-2-methylquinoline)-(4-phenylphenoxy) aluminum) and PPV (poly (p phenylene vinylene)) may be made of at least one phosphorescent material. When the light emitting layer 140 generates blue light, the light emitting layer 140 includes a host material including CBP or mCP, and is made of a phosphor material including a dopant material including (4,6-F2ppy) 2Irpic. Alternatively, it may be made of at least one fluorescent material of spiro-DPVBi, spiro-6P, distilbenzene (DSB), distriarylene (DSA), PFO-based polymer and PPV-based polymer.

The emission layer 140 may include a chiral material 190, for example, a chiral dopant, to have a polarization state in which the light emitted from the emission layer 140 rotates in a specific direction. have. Chiral The chiral material 190 may affect the orientation direction of the surrounding organic light emitting molecules. The chiral dopant 190 may stack the light emitting molecules in a spiral structure by providing a twist angle in the thickness direction of the light emitting molecules. As a result, the light generated from the light emitting molecules may have a rotating polarization state. Refer to FIG. 2 for a more detailed description.

2 is a diagram for describing a spiral stacked structure of light emitting molecules according to an exemplary embodiment of the present invention. Specifically, FIG. 2 (a) shows a structure for implementing a rotation polarization state according to the prior art, and FIG. 2 (b) shows a structure for implementing a rotation polarization state according to an embodiment of the present invention.

Referring to FIG. 2 (a), the light emitting molecules themselves may have a helical structure. In this case, since the light emitting molecules themselves have a helical structure, the light generated from the light emitting molecules may have a polarized state in which the light rotates. In addition, a helical dopant, eg, a 1-aza (6) heliscene, may be attached to the light emitting molecule. In this case, light generated in the light emitting molecules by the helical dopant may have a polarization state in which the light rotates.

However, in the case illustrated in FIG. 2 (a), there is a difficulty in that the wavelength, or color, of light generated according to the synthesis of the dopant is changed. In addition, since the ability to impart a rotation polarization state to generated light depends on the structure of the light emitting molecule itself or the structure of the dopant itself, there is a limit to the ability to generate rotation polarization.

Alternatively, referring to FIG. 2B, the chiral dopant may provide the torsion angles to the light emitting molecules. When the light emitting molecules are stacked from the layer 1 to the layer 4 in the thickness direction of the light emitting molecules, the chiral dopant may rotate the light emitting molecules θ1 of the layer 2 and the light emitting molecules θ2 of the layer 3, and the light emitting molecules of the layer 4 by θ3. have. To this end, the chiral dopant may have a helical twisting power (HTP) of 10 / um or more, preferably 100 / um, to provide a twist angle to the light emitting molecules. According to an example, the chiral dopant may have a non-helical shape. In addition, the chiral dopant may be formed of R5011. In other words, the chiral dopant is capable of providing a torsional stacking shape of the light emitting molecules at a macroscopic level.

According to an embodiment, when thermal annealing is performed in a state in which the light emitting molecules and the chiral dopant are mixed, for example, the thermal annealing is performed at 140 degrees or more and cooled at room temperature, the light emitting molecules may be formed by the chiral dopant as shown in FIG. As shown in b), it may have a spiral laminate structure. That is, in the case of cooling after the phase transition to mesophase through heat annealing, the light emitting molecules may have a spiral stacked structure.

Because of the chiral material, since the light emitting molecules have a spiral stacked structure, the light generated from the light emitting molecules may have a polarization state rotating in a specific direction. The light emitting layer 140 formed of spirally stacked light emitting molecules emits first light having a polarization state rotating in a first direction toward the first electrode 110, and toward the second electrode 170. The second light having the polarization state rotating in the second direction opposite to the first direction can be emitted.

At this time, unlike the prior art, according to an embodiment of the present invention, by allowing the light emitting molecules to have a spiral shape in the stacking direction of the light emitting molecules, it is possible to maximize the rotation polarization characteristics applied to the generated light.

Referring back to Figure 1, the light emitting layer 140. It may be formed using a variety of methods such as vacuum deposition, spin coating, casting, Langmuir-Blodgett, inkjet printing, laser printing, and laser induced thermal imaging (LITI).

The electron transporting layer 150 (ETL) may be formed in the emission layer 140 to transport electrons to the light emission layer 105. To this end, the electron transport layer 150 is, for example, at least one of Alq3, PBD, TAZ, spiro-PBD, BAlq, Liq (lithium quinolate), BMB-3T, PF-6P, TPBI, COT and SAlq It may be made of, but not limited to.

The electron injection layer 160 may be formed on the electron transport layer 150 to inject electrons into the electron transport layer 150. To this end, the electron injection layer 160 may be made of at least one of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq and SAlq.

The electron transport layer 150 and the electron injection layer 160 may be vacuum deposited, spin coated, cast, LB (Langmuir-Blodgett), inkjet printing, laser printing, laser thermal induced (Laser Induced Thermal Imaging, LITI) and the like can be formed using various methods.

The second electrode 170 may be formed on the electron injection layer 160 to provide electrons to the electron injection layer 160. The second electrode 170 may have a high conductivity and may have a reflectivity to reflect light emitted to the second electrode 170 in the y ′ direction. For example, the second electrode 170 may be made of at least one material of gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), and magnesium (Mg), but is not limited thereto. no.

According to an embodiment, the second electrode 170 may be configured as a shared electrode shared by the subpixels.

A capping layer (not shown) may be formed on the second electrode 170. The capping layer serves to enhance the light extraction effect. The capping layer may be made of an organic material having a hole transporting ability, or may be made of a host material constituting the light emitting layer. However, the capping layer may be omitted.

Although not shown, an encapsulation layer may be formed on the second electrode 170 to prevent moisture permeation.

According to an embodiment, the polarization layer 180 may be positioned in the light emission direction, that is, the y 'direction, based on the first electrode 110. The polarizing layer may include a circular polarizing layer and a linear polarizing layer positioned in the y 'direction with respect to the circular polarizing layer. The polarization layer 180 may selectively pass light corresponding to the polarization state of the circular polarization layer. In this case, the circular polarization layer of the polarization layer 180 may selectively pass light having a polarization state rotating in the first direction. That is, the polarization layer 180 may block light having a polarization state rotating in a second direction from passing through the polarization layer 180. Specific functions of the polarization layer 180 will be described later with reference to FIG. 2. The circular polarizing layer of the polarizing layer may be understood as a concept including an elliptical polarizing layer.

Meanwhile, the display 100 according to the first embodiment of the present invention may be manufactured by the following process. First, a substrate (not shown) may be provided. On the substrate, a driving layer including at least one transistor and at least one capacitance for controlling each pixel through a photolithography process may be formed. On the driving layer, the first electrode 110 may be formed by a photolithography process or a liquid phase process. The light emission layer 105 may be formed on the first electrode 110. In this case, the light emitting layer 105 may be applied by a solution process, that is, a soluble process, when the organic molecules are polymers. In contrast, when the organic molecules are low molecular weight, they may be deposited through a vapor deposition process. The chiral material may be formed together with the light emitting layer 105, for example, the light emitting layer 140. The second electrode 170 may be formed on the light emitting layer 105. An encapsulation (eg, organic-inorganic composite barrier layer) may be formed on the second electrode 170 to prevent moisture and air permeation.

The display according to the first embodiment of the present invention has been described above with reference to FIG. 1. Hereinafter, an operation example of the display according to the first embodiment of the present invention will be described.

Referring to FIG. 3, an example in which the display according to the first embodiment of the present invention blocks external light reflection will be described, and an example of maximizing light efficiency will be described.

The display 100 may block the external light Lout from being incident from y 'to the y direction and then proceed from y to y' to prevent the external light Lout from exiting the polarization layer 180. Thus, the display according to the first embodiment of the present invention may provide an external light blocking effect. It will be described in detail below.

3, first, an environment in which external light Lout enters into the display 100 may be created. In this case, the external light Lout may have a non polarized state before entering the display 100. However, since the polarizing layer 180 selectively passes the light rotating in the first direction, that is, counterclockwise, with respect to the advancing direction, the external light Lout is the polarizing layer 180 of the display 100. After passing through, it has a polarization state that rotates in a first direction that is counterclockwise when viewed from y 'with respect to the light propagation direction (y' to y).

External light Lout having a polarization state rotating in the counterclockwise first direction may travel in the y direction in the y 'direction. Accordingly, the external light Lout having the polarization state rotating in the first direction may pass through the light emission layer 105 and be reflected by the second electrode 170. Accordingly, the traveling direction of the external light Lout may be changed from y 'to y direction and then changed from y to y' direction. The rotation direction of the polarization state of the external light Lout may be changed by reflection. That is, the polarization direction of the external light Lout may be changed from the first direction counterclockwise with respect to the travel direction y 'to y, and from the second direction clockwise with respect to the travel direction y to y'. . The external light Lout having the polarization state rotating in the second direction by the reflection of the second electrode 170 may pass through the light exit layer 105 to reach the polarization layer 180. However, the external light Lout having the polarization state rotating in the second direction cannot pass through the polarization layer 180 that selectively passes the light rotating in the first direction. Accordingly, even when the external light Lout is irradiated into the display 100, the external light Lout entering the inside of the display 100 may be blocked from being recognized by the viewer.

It has been described above that the display according to the first embodiment of the present invention provides an effect of blocking external light reflection. Hereinafter, an example of maximizing light efficiency will be described.

The light generated by the emission layer 140 may be divided into a first light Lin1 traveling toward the first electrode 110 and a second light Lin2 traveling toward the second electrode 170. . In this case, the light generated by the light emitting layer 140 may have a rotation polarization state by light emitting molecules stacked in a spiral shape by the chiral material 190.

Specifically, the first light Lin1 may have a polarization state that rotates in a first direction that is counterclockwise with respect to the chiral light propagation direction (y to y ′). The first light Lin1 having a polarization state rotating in the first direction may pass through the polarization layer 180. Accordingly, the first light Lin1 may be transmitted to the viewer.

The second light Lin2 may have a polarization state that rotates in a second direction that is clockwise with respect to the chiral light traveling direction y ′ to y. The second light Lin2 having the polarization state rotating in the second direction may be reflected by the second electrode 170. The second light Lin2 reflected by the second electrode 170 may have a polarization state that rotates in a first direction counterclockwise with respect to the light propagation direction y to y '. The second light Lin2 having the polarization state rotating in the first direction may pass through the polarization layer 180. Accordingly, the second light Lin2 may be transmitted to the viewer.

In summary, the light generated by the emission layer 140 may have a light propagation path traveling in a random direction. The light generated by the emission layer 140 has a random path, and may be largely divided into a first light Lin1 directed to the first electrode 110 and a second light Lin2 directed to the second electrode 170. Can be. At this time, since the first light Lin1 has a polarization state rotating in the first direction, the first light Lin1 can pass through the polarization layer 180, and the second light Lin2 has a polarization state rotating in the second direction. Although initially included, the light may be reflected by the second electrode 170 to have a polarization state rotating in the first direction. Accordingly, not only the first light but also the second light may pass through the polarization layer 180. Accordingly, the light efficiency delivered to the viewer can be maximized.

The operation example of the display according to the first embodiment of the present invention has been described above with reference to FIG. 3. Hereinafter, first to third modified examples of the first embodiment of the present invention will be described with reference to FIGS. 4 to 6. 4 to 6, in the modifications of the first embodiment of the present invention, a description of a configuration overlapping with the first embodiment described with reference to FIGS. 1 to 3 will be omitted.

Referring to FIG. 4, according to a first modified example of the present invention, the chiral material 190 may be included in at least one layer of the hole transport layer 130 and the electron transport layer 150. In this case, the chiral material 190 may stack the molecules constituting the hole transport layer 130 and / or the molecules constituting the electron transport layer 150 in a spiral structure in the thickness direction of the molecules.

In this case, the first light Lin1 toward the first electrode 110 among the light generated by the light emitting layer 140 may have a chiral rotation polarization state by the hole transport layer 130 in which the molecules have a spiral stacked structure. Can be. That is, since the first light Lin1 has a polarization state rotating in the first direction, the first light Lin1 may pass through the polarization layer 180.

In addition, the second light Lin2 toward the second electrode 170 of the light generated by the light emitting layer 140 may have a rotation polarization state by the electron transport layer 150 chiral in which the molecules have a spiral stacked structure. have. That is, the second light Lin2 may have a polarization state that rotates in a second direction, and may be reflected by the second electrode 170 as described above, thereby having a polarization state that rotates in a first direction. Accordingly, the second light Lin2 may pass through the polarization layer 180.

According to the first modified example of the present invention with reference to FIG. 4, the chiral material 190 is included in the hole transport layer 130 and the electron transport layer 150, but the chiral material 190 is Not only the hole transport layer 130 and the electron transport layer 150 but also the light emitting layer 140 may be included.

Referring to FIG. 5, according to a second modified example of the present invention, the chiral material 190 may be included in at least one of the hole injection layer 120 and the electron injection layer 160. In this case, the chiral material 190 may stack molecules forming the hole injection layer 120 and / or molecules forming the electron injection layer 160 in a spiral structure in the thickness direction of the molecules.

In this case, the first light Lin1 directed toward the first electrode 110 among the light generated by the light emitting layer 140 may generate a chiral rotation polarization state by the hole injection layer 120 having the spiral stacked structure. Can have That is, since the first light Lin1 has a polarization state rotating in the first direction, the first light Lin1 may pass through the polarization layer 180.

In addition, the second light Lin2 toward the second electrode 170 of the light generated by the emission layer 140 may have a chiral rotation polarization state by the electron injection layer 160 having the spiral stacked structure. Can be. That is, the second light Lin2 may have a polarization state that rotates in a second direction, and may be reflected by the second electrode 170 as described above, thereby having a polarization state that rotates in a first direction. Accordingly, the second light Lin2 may pass through the polarization layer 180.

According to the second modified example of the present invention with reference to FIG. 5, it is assumed that the chiral material 190 is included in the hole injection layer 120 and the electron injection layer 160, but the chiral material 190 ) May be further included in at least one of the light emitting layer 140, the hole transport layer 130 and the electron transport layer 150.

Referring to FIG. 6, the display 103 according to the third modified example of the first embodiment of the present invention shows an example in which the technical spirit of the present invention is applied to a tandem structure. The tandem structure may refer to a structure in which two or more light emitting layers are connected in series. In this case, the charge generation layer may provide an interface of the individual light emission layers. It will be described in detail below.

Referring to FIG. 6, the display 103 according to the third modified example of the first embodiment of the present invention has a first electrode 110 and a first light emitting layer 105a in the y direction based on the polarization layer 180. ), The charge generating layer 165, the second light emitting layer 105b, and the second electrode 170 may be stacked in this order. At this time, the first light emission layer 105a includes the first hole injection layer 120a, the first hole transport layer 130a, the first light emitting layer 140a, the first electron transport layer 150a, and the first electron injection layer. 160a. In addition, the second light emission layer 105b may include the second hole injection layer 120b, the second hole transport layer 130b, the second light emitting layer 140b, the second electron transport layer 150b, and the second electron injection layer ( 160b).

Since the polarizing layer 180, the first electrode 110, and the second electrode 170 are the same as described above with reference to FIGS. 1 and 2, detailed descriptions thereof will be omitted.

The first hole injection layer 120a and the second hole injection layer 120b may perform a function of smoothly injecting holes. For this purpose, for example, MTDATA (4,4 ', 4 "-tris (3-methylphenylphenylamino) triphenylamine), CuPc (copper phthalocyanine), PEDOT / PSS (poly (3,4-ethylenedioxythiphene, polystyrene sulfonate) and NPD ( N, N-dinaphthyl-N, N'-diphenylbenzidine) may be made of at least one material, but is not limited thereto.

The first hole transport layer 130a and the second hole transport layer 130b may perform a function of smoothly transporting holes. For this purpose, for example, NPD (N, N-dinaphthyl-N, N'-diphenylbenzidine), TPD (N, N'-bis- (3-methylphenyl) -N, N'-bis- (phenyl) -benzidine ), s-TAD and MTDATA (4,4 ', 4 "-Tris (N-3-methylphenyl-N-phenyl-amino) -triphenylamine), but may not be limited thereto.

The first electron transport layer 150a and the second electron transport layer 150b may transport electrons to the light exit layer. To this end, for example, Alq3, PBD, TAZ, spiro-PBD, BAlq, Liq (lithium quinolate), may be made of at least one material of BMB-3T, PF-6P, TPBI, COT and SAlq, but is not limited thereto. It doesn't happen.

The first electron injection layer 160a and the second electron injection layer 160b may inject electrons into the electron transport layer. To this end, it may be made of at least one material of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq and SAlq.

The first light emitting layer 140a may be a blue light emitting layer, a dark blue light emitting layer, a sky blue light emitting layer, a red-blue light emitting layer, a yellow-green light emitting layer, or green. (Green) It may be composed of a light emitting layer. The peak wavelengths of the light emitting regions of the blue light emitting layer, the dark blue light emitting layer, and the sky blue light emitting layer may range from 440 nm to 480 nm. In addition, the peak wavelength of the light emitting region of the red-blue light emitting layer may be in the range of 600 nm to 650 nm. In addition, the peak wavelength of the light emitting region of the yellow-green light emitting layer or the green light emitting layer may be in a range of 510 nm to 580 nm.

The second light emitting layer 140b may be a blue light emitting layer, a dark blue light emitting layer, a sky blue light emitting layer, a red-blue light emitting layer, a yellow-green light emitting layer, or green. (Green) It may be composed of a light emitting layer. Peak wavelengths of the light emitting regions of the blue light emitting layer, the dark blue light emitting layer, and the sky blue light emitting layer may range from 440 nm to 480 nm. In addition, the peak wavelength of the light emitting region of the red-blue light emitting layer may range from 600 nm to 650 nm. In addition, the peak wavelength of the light emitting region of the yellow-green light emitting layer or the green light emitting layer may be in a range of 510 nm to 580 nm.

According to an embodiment, the first light emitting layer 140a may emit a color having a peak between yellow and green, and the second light emitting layer 140b may emit blue light. As a result, the light emitted from each of the first emission layer 140a and the second emission layer 140b may be combined to have a white wavelength.

In this case, the first light emitting layer 140a may include a first chiral material 190a, and the second light emitting layer 140b may include a second chiral material 190b. Since the first and second

chiral materials

190a and 190b are the same as those described with reference to FIGS. 1 to 3, detailed descriptions thereof will be omitted.

The charge generation layer 165 may be located between the first emission layer 140a and the second emission layer 140b. The charge generating layer 165 controls the charge balance between the first light emitting layer 140a and the second light emitting layer 140b. The charge generation layer 165 may include an N-type charge generation layer and a P-type charge generation layer. The N-type charge generating layer may be formed of an organic layer doped with an alkali metal such as Li, Na, K, or Cs, or an alkaline earth metal such as Mg, Sr, Ba, or Ra, respectively. In addition, the P-type charge generating layer may be formed of an organic layer each containing a P-type dopant.

4 to 6, the first to third modified examples of the first embodiment of the present invention have been described. Hereinafter, a fourth modified example of the first embodiment of the present invention will be described with reference to FIG. 7.

According to the fourth modified example of the first embodiment of the present invention, the molecules of the light emitting layer 105 are aligned, which is different from the first to third modified examples of the first and first embodiments of the present invention. . In addition, the polarization layer 180, the first electrode 110, the hole injection layer 120, the hole transport layer 130, the electron transport layer 150, the electron injection layer 160, and the second electrode 170 are described above. Since the structure and function correspond to those described with reference to FIGS. 1 to 3, detailed descriptions thereof will be omitted.

Referring to FIG. 7, the light emitting layer 140 according to the fourth modification of the first embodiment of the present invention may include the chiral material 190 described above, and the organic molecules forming the light emitting layer 140. Is characterized in that it can be aligned.

According to a chiral embodiment, the organic molecules 142 of the emission layer 140 may be formed such that the major axis of the organic molecules 142 is substantially parallel to the first electrode 110 and the second electrode 170. As shown in FIG. 6, they may be aligned in the xx 'direction. In chiral chiral, the organic molecules 242 and the chiral material 190 are aligned parallel to the first electrode and the second electrode, and in the y-axis direction, the long axis of the organic molecules 242 rotates helically. Can be sorted in such a way.

Hereinafter, effects according to the fourth modification of the first embodiment of the present invention will be described.

According to the fourth modified example of the first embodiment of the present invention, the organic molecules 142 of the emission layer 140 may be aligned in a specific direction, for example, the x-x 'direction of FIG. 7. Accordingly, the light emitted from the emission layer 140 may have linearly polarized light. In addition, the linearly polarized light generated by the emission layer 140 may have a polarization state that rotates in a first direction and a second direction by a spiral stacked structure of chiral light emitting molecules.

At this time, since the light emitting layer 140 emits linearly polarized light by the alignment of the organic molecules 142, the efficiency of polarization rotating in the first and second directions may increase. In other words, when the light emitting layer 140 emits light linearly polarized by the alignment of the organic molecules 142, the circularly polarized light efficiency (elliptical polarization efficiency) may be increased. Can be. Accordingly, since the ratio of the light passing through the polarization layer 180 among the first light Lin1 and the second light Lin2 described with reference to FIG. 3 increases, the light efficiency may be further improved.

Hereinafter, the alignment method of organic molecules is demonstrated.

In order to align the organic molecules 142 of the emission layer 140, adjacent layers interfacing with the emission layer 140 may be aligned in a specific direction. For example, the hole transport layer 130 formed before the light emitting layer 140 may be aligned in a specific direction. Since the surface of the hole transport layer 130 is arranged in a specific direction, the light emitting layer 140 interfacing with the hole transport layer 130 may also be induced in a specific direction.

For example, the hole transport layer 130 may be aligned in a specific direction through rubbing. Alternatively, the hole transport layer 130 may be aligned in a specific direction through a light orientation for irradiating line flattened light. Hereinafter, for convenience of description, it will be assumed that the optical orientation.

For photoalignment, the hole transport layer 130 is made of polyimide, polyamic acid, polynorbornene, phenyl maleimide copolymer, polyvinylcinnamate, polyazobenzene, polyethylene Polyethyleneimine, Polyvinyl alcohol, Polyamide, Polyethylene, Polystylene, Polyphenylenephthalamide, Polyester, Polyurethane, The polymer may further include a polymer selected from the group consisting of polysiloxanecinnamate, cellulosecinnamate-based compound, and polymethyl methacrylate-based compound. That is, the above-described photoalignment material may be further included in the hole transport material described with reference to FIG. 1. Alternatively, the hole transport layer 130 may be made of only a light alignment material.

Ultraviolet rays, for example, linearly polarized light, elliptically polarized light, circularly polarized light, and non-polarized light may be applied to the hole transport layer 130. Accordingly, the surface of the hole transport layer 130 may be oriented in a specific direction, for example, x-x 'direction.

The light emitting layer 140 may be formed on the oriented hole transport layer 130. The organic molecules 142 and the chiral material 190 constituting the emission layer 140 may be formed in an alignment direction provided by the hole transport layer 130, that is, in an x-x 'direction.

In the above, the structure and effect of the 4th modified example of the 1st Example of this invention were demonstrated. In describing the fourth modified example of the present invention, the organic molecules of the light emitting layer 140 have been described as being aligned, but other layers other than the light emitting layer 140 of the light emitting layer 105 may be aligned.

Specifically, the technical idea of the fourth modified example may be applied to the first modified example of the first embodiment. In this case, the organic molecules of the hole transport layer 130 and the electron transport layer 150 including the chiral material 190 may also be aligned in a specific direction, for example, x-x 'direction. If the hole transport layer 130 needs to be aligned, the hole injection layer 120 formed before the hole transport layer 130 may be rubbed or photoaligned. In addition, when alignment of the electron transport layer 150 is required, the emission layer 140 formed before the electron transport layer 150 may be rubbed or photoaligned. Thus, the organic molecules of the hole transport layer 130 and the electron transport layer 150 may also be aligned in a specific direction, for example, x-x 'direction.

In addition, the technical idea of the fourth modified example may be applied to the second modified example of the first embodiment. In this case, the organic molecules of the hole injection layer 120 and the electron injection layer 160 including the chiral material 190 may also be aligned in a specific direction, for example, x-x 'direction. If alignment of the hole injection layer 120 is required, an alignment layer oriented in a specific direction may be formed between the first electrode 110 and the hole injection layer 120. In addition, when alignment of the electron injection layer 160 is required, the electron transport layer 150 formed before the electron injection layer 160 may be rubbed or photoaligned. Thus, the organic molecules of the hole injection layer 120 and the electron injection layer 160 may also be aligned in a specific direction, for example, x-x 'direction.

In addition, the technical idea of the fourth modified example may be applied to the third modified example of the first embodiment. In this case, organic molecules of the first light emitting layer 140a including the first chiral material 190a and the second light emitting layer 140b including the second chiral material 190b may also have a specific direction, for example, xx '. Can be aligned in the direction. To this end, the organic molecules (not shown) of the first emission layer 140a may be aligned through a rubbing or photoalignment process by the above-described method. Thereafter, the organic molecules (not shown) of the second emission layer 140b may be aligned in a specific direction by orienting the second hole transport layer 130b through linearly polarized light emitted from the first emission layer 140a. have. In this case, the first light emitting layer 140a may emit blue, and the second light emitting layer 140b may emit yellow-green (YG). As a result, the organic molecular alignment process can be reduced.

Of course, the technical spirit of the first embodiment, the first modification, the second modification, the third modification, and the fourth modification may be combined with each other.

The display according to the first embodiment of the present invention and its modified examples has been described above with reference to FIGS. 1 to 7. Hereinafter, with reference to FIG. 8, the application of the first embodiment of the present invention and its modifications will be described.

8 is a view for explaining an application example of the first embodiment of the present invention and its modifications.

The above-described display according to the first embodiment of the present invention, modifications thereof may be applied to the top light emitting display device.

Referring to FIG. 8, the lower light emitting display device may include a substrate S. FIG.

The substrate S may be made of not only a glass substrate, but also a flexible substrate, for example, at least one material of polyethylene terephthalate (PET), polyethylenaphthalate (PEN), and polyimide (PI).

Pixels, for example, subpixels Psub1 and Psub2 may be provided on the substrate S. The subpixels Psub1 and Psub2 may include a transistor device T, an anode electrode AE, a light emission layer LG, and a cathode electrode CE.

The transistor element T is provided on the substrate S, and is provided on the active layer ACT, the first insulating film I1 and the first insulating film I1 provided on the active layer ACT. The gate electrode GE, the second insulating film I2 provided on the gate electrode GE, and the second insulating film I2 provided on the first and second contact holes CNT1 and CNT2. It may include a source electrode SE and a drain electrode DE in contact with the active layer ACT. As described above, the transistor device T may be implemented in other ways.

The transistor device T may transmit a driving signal applied to the source electrode SE to the anode AE through the drain electrode DE. That is, when an on signal is applied to the gate electrode GE of the transistor device T, the anode AE may receive a driving signal.

The gate electrode GE is a metal or an alloy of at least one of Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, and Cu. Or it may be formed in multiple layers.

The active layer ACT may include a semiconductor material, and the semiconductor material may be amorphous and / or crystalline. For example, the active layer ACT may be formed of at least one material of IGZO, ZnO, SnO 2, In 2 O 3, Zn 2 SnO 4, and Ge 2 O 3.

The source electrode SE and the drain electrode DE may be any one of Al, Pt, Pd, Ag, Mg, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, Cu, for example. With one metal or alloy thereof, it can be formed in a single layer or in multiple layers.

An interlayer insulating layer ILD may be provided on the source electrode SE and the drain electrode DE.

The anode electrode AE is formed on the interlayer insulating film ILD, and the anode electrode AE is formed on the drain electrode DE through a third contact hole CNT3 formed in the interlayer insulating film ILD. ) Can be connected.

Meanwhile, partition walls may be formed between the subpixels, and thus, the subpixels may be divided with each other. The partition wall may include at least one of an inorganic insulating material such as silicon nitride (SiNx) and silicon oxide (SiOx) or an organic insulating material such as benzocyclobutene or acrylic resin. .

For each of the subpixels, a light emission layer LG may be formed on the anode AE. For example, the light emission layer LG may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. In this case, the light emitting layer may be provided to emit light of different colors for each subpixel. As a result, light of different colors can be emitted for each subpixel. Alternatively, in the case of a tandem structure, pixels may be commonly provided to emit white light. In this case, the color may be implemented through the color filter.

The cathode electrode CE may be provided on the light emitting layer LG and the partition wall. For example, the cathode electrode CE may provide electrons to the light emission layer LG.

An encapsulation layer and / or an opposing substrate may be provided on the cathode electrode CE. The encapsulation layer and / or the opposing substrate may block moisture and / or oxygen that may penetrate into the display device.

The lower light emitting display device may emit the generated light toward the substrate. Since the lower light emitting display device emits light toward the anode electrode, the cathode electrode may be made of a highly conductive material. Accordingly, the lower light emitting display device may be advantageous to a large area display device.

The light emitting layer of the first exemplary embodiment and modified examples thereof may be applied to the light emitting layer LG of the lower light emitting display device.

In the above, the display according to the first embodiment of the present invention has been described. Hereinafter, a display according to a second embodiment of the present invention will be described with reference to FIGS. 9 through 14. Previously, while the display according to the first embodiment of the present invention is a bottom emission method, the display according to the second embodiment of the present invention to be described later is different in that it is a top emission method.

Referring to FIG. 9, the display according to the second embodiment of the present disclosure may include a substrate (not shown), an active layer (not shown), a first electrode 210, and a light emitting layer 205 in the y 'direction. The second electrode 270 and the polarization layer 280 may have a stacked structure.

Unlike the first electrode 110 of the first embodiment, the first electrode 210 according to the second embodiment may be made of a high conductivity electrode material having an opacity to provide a reflective surface. For example, the first electrode 210 may be formed of a transparent conductive material layer having a high work function, such as indium-tin-oxide (ITO), and silver (Ag) or silver alloy (Ag alloy). It may include a reflective material layer.

The first electrode 210 may be formed as a shared electrode to be shared between neighboring pixels, or may be dividedly formed for each pixel. Hereinafter, for convenience of description, it will be assumed that the first electrode 210 is a split electrode. In this case, the first electrode 110 may be individually controlled for each pixel.

The light emitting layer 205 may be configured to emit red, blue, and green light for each pixel. To this end, the light emitting layer 205 may include a hole injection layer 220, a hole transport layer 230, a light emitting layer 240, an electron transport layer 250, an electron injection layer 260.

The hole injection layer 220, the hole transport layer 230, the emission layer 240, the electron transport layer 250, and the electron injection layer 260 according to the second embodiment may each be the hole injection layer 120 according to the first embodiment. , Corresponding to the hole transport layer 130, the light emitting layer 140, the electron transport layer 150, and the electron injection layer 160, a detailed description thereof will be omitted.

The light emitting layer 240 according to the second embodiment may also include a chiral material 290. The chiral material 290 may provide a twist angle such that the organic light emitting molecules constituting the light emitting layer 240 have a spiral stacked structure. The chiral material formed in the light emitting layer 240 is formed by the spiral stacked structure. The light is directed toward the second electrode 270 and has a first light having a polarization state rotating in a first direction (counterclockwise with respect to the advancing direction, that is, counterclockwise with respect to the y'-y path). Has a polarization state that is emitted and rotates toward the first electrode 210 in a second direction (clockwise with respect to the advancing direction, that is, clockwise with respect to the yy 'path) which is opposite to the first direction. The second light can be emitted.

The second electrode 270 may be formed of a transparent electrode to emit light in the y direction.

According to an embodiment, the second electrode 270 may be configured as a shared electrode shared by the subpixels.

A capping layer (not shown) may be formed on the second electrode 270. The capping layer serves to enhance the light extraction effect. The capping layer may be made of an organic material having a hole transporting ability, or may be made of a host material constituting the light emitting layer. However, the capping layer may be omitted.

Although not shown, an encapsulation layer may be formed on the second electrode 270 to prevent moisture permeation.

The polarization layer 280 may be formed on the second electrode 270. The polarization layer 280 may include a circular polarization layer and a linear polarization layer positioned in the y direction with respect to the circular polarization layer. The polarization layer 280 may selectively pass light corresponding to the polarization state of the circular polarization layer. In this case, the circular polarization layer of the polarization layer 280 may selectively pass light having a polarization state rotating in the first direction. That is, the polarization layer 280 may block light having a polarization state rotating in a second direction from passing through the polarization layer 280.

The display according to the second exemplary embodiment of the present invention has been described above with reference to FIG. 8. Hereinafter, an operation example of the display according to the second embodiment of the present invention will be described with reference to FIG. 9.

Like the display according to the first embodiment of the present invention, a display other than the second embodiment of the present invention may block external light reflection and maximize light efficiency.

The display 200 may provide an external light blocking effect to prevent external light Lout incident from y to y 'direction to be reflected inside the display 100 and transmitted to the viewer.

Referring to FIG. 10, first, an environment in which external light Lout enters into the display 200 may be created. In this case, the external light Lout may have a non-polarization state before entering the display 200. However, since the polarizing layer 280 selectively passes the light rotating in the first direction, that is, counterclockwise, with respect to the advancing direction, the external light Lout is the polarizing layer 280 of the display 200. After passing through, it has a polarization state that rotates in the first direction, which is counterclockwise when viewed from y with respect to the light propagation direction (y to y ').

External light Lout having a polarization state rotating in the counterclockwise first direction may travel in the y 'direction in the y direction. Accordingly, the external light Lout having the polarization state rotating in the first direction may pass through the light output layer 205 and be reflected by the first electrode 210. Accordingly, the traveling direction of the external light Lout may be changed from y to y 'and then changed from y' to y. The rotation direction of the polarization state of the external light Lout may be changed by reflection. That is, the polarization direction of the external light Lout may be changed from the first direction counterclockwise with respect to the traveling direction y 'to y and from the second direction clockwise with respect to the traveling direction y' to y. . The external light Lout having the polarization state rotating in the second direction by the reflection of the first electrode 210 may pass through the light emission layer 205 and reach the polarization layer 280. However, the external light Lout having the polarization state rotating in the second direction cannot pass through the polarization layer 280 that selectively passes the light rotating in the first direction. Accordingly, even when the external light Lout is irradiated into the display 200, the external light Lout entering the inside of the display 200 may be blocked from being recognized by the viewer.

It has been described above that the display according to the second embodiment of the present invention provides an effect of blocking external light reflection. Hereinafter, an example of maximizing light efficiency will be described.

The light generated by the emission layer 240 may be divided into a first light Lin1 traveling toward the second electrode 270 and a second light Lin2 traveling toward the first electrode 210. . In this case, the light generated by the light emitting layer 240 may have a rotation polarization state by light emitting molecules stacked in a spiral shape by the chiral material 290.

Specifically, the first light Lin1 may have a polarization state that rotates in a first direction that is counterclockwise with respect to the chiral light propagation direction y ′ to y. The first light Lin1 having a polarization state rotating in the first direction may pass through the polarization layer 280. Accordingly, the first light Lin1 may be transmitted to the viewer.

The second light Lin2 may have a polarization state that rotates in a second direction that is clockwise with respect to the chiral light traveling direction y to y ′. The second light Lin2 having the polarization state rotating in the second direction may be reflected by the first electrode 210. The second light Lin2 reflected by the first electrode 210 may have a polarization state that rotates in a first direction counterclockwise with respect to the light propagation direction y ′ to y. The second light Lin2 having the polarization state rotating in the first direction may pass through the polarization layer 280. Accordingly, the second light Lin2 may be transmitted to the viewer.

In summary, the light generated by the light emitting layer 240 has a random path, but is a first light Lin1 directed to the second electrode 270 and a second light Lin2 directed to the second electrode 210. It can be divided largely. At this time, since the first light Lin1 has a polarization state rotating in the first direction, the first light Lin1 can pass through the polarization layer 280, and the second light Lin2 has a polarization state rotating in the second direction. Although initially included, the light may be polarized to rotate in the first direction by being reflected by the first electrode 210. Accordingly, not only the first light but also the second light may pass through the polarization layer 280. Accordingly, the light efficiency delivered to the viewer can be maximized.

The operation example of the display according to the second embodiment of the present invention has been described above with reference to FIG. 10. Hereinafter, a first modified example of the second embodiment of the present invention will be described with reference to FIG. 11.

Referring to FIG. 11, according to a second modified example of the present invention, the chiral material 290 may be included in at least one of the hole transport layer 230 and the electron transport layer 250. In this case, the chiral material 290 may stack molecules forming the hole transport layer 230 and / or molecules forming the electron transport layer 250 in a spiral structure in the thickness direction of the molecules.

In this case, the first light Lin1 toward the second electrode 270 of the light generated by the light emitting layer 240 may have a rotational polarization state by chiral to the electron transport layer 250 having the spiral stacked structure. . That is, since the first light Lin1 has a polarization state rotating in the first direction, the first light Lin1 may pass through the polarization layer 280.

In addition, the second light Lin2 directed toward the first electrode 210 of the light generated by the light emitting layer 240 may have a rotation polarization state by chiral to the hole transport layer 230 having the spiral stacked structure. That is, the second light Lin2 may have a polarization state that rotates in a second direction, and may be reflected by the first electrode 210 as described above, thereby having a polarization state that rotates in the first direction. Accordingly, the second light Lin2 may pass through the polarization layer 280.

According to the first modified example of the second embodiment of the present invention with reference to FIG. 11, the chiral material 290 has been described as being included in the hole transport layer 230 and the electron transport layer 250. The 290 may be included in the light emitting layer 240 as well as the hole transport layer 230 and the electron transport layer 250.

Referring to FIG. 12, according to a second modified example of the present invention, the chiral material 290 may be included in at least one of the hole injection layer 220 and the electron injection layer 260. In this case, the chiral material 290 may stack the molecules constituting the hole transport layer 220 and / or the molecules constituting the electron transport layer 260 in a spiral structure in the thickness direction of the molecules.

In this case, the first light Lin1 directed toward the second electrode 270 of the light generated by the light emitting layer 240 may generate a rotational polarization state by chiral to the electron injection layer 260 having the spiral stacked structure. Can have That is, since the first light Lin1 has a polarization state rotating in the first direction, the first light Lin1 may pass through the polarization layer 280.

In addition, the second light Lin 2 of the light generated from the light emitting layer 240 toward the first electrode 210 may have a rotational polarization state by chirality to the hole injection layer 220 having the spiral stacked structure. Can be. That is, the second light Lin2 may have a polarization state that rotates in a second direction, and may be reflected by the first electrode 210 as described above, thereby having a polarization state that rotates in the first direction. Accordingly, the second light Lin2 may pass through the polarization layer 280.

According to a second modified example of the second embodiment of the present invention with reference to FIG. 12, it is assumed that the chiral material 290 is included in the hole injection layer 220 and the electron injection layer 260. This material 290 may be further included in at least one of the light emitting layer 240, the hole transport layer 230 and the electron transport layer 250.

According to the third modified example of the second embodiment of the present invention, the molecules of the light emitting layer 205 are different from the first and second modified examples of the second and second embodiments of the present invention in that the molecules are aligned. . In addition, the polarization layer 280, the first electrode 210, the hole injection layer 220, the hole transport layer 230, the electron transport layer 250, the electron injection layer 260, and the second electrode 270 are described above. Structures and functions corresponding to those described with reference to FIGS. 9 and 10 will be omitted.

Referring to FIG. 13, the light emitting layer 240 according to the third modification of the second embodiment of the present invention may not only include the chiral material 290 described above, but also organic molecules constituting the light emitting layer 240. Is characterized in that it can be aligned.

According to an embodiment, the organic molecules 242 of the emission layer 240 may have a long axis of the organic molecules 242 substantially parallel to the first electrode 210 and the second electrode 270. As shown, they may be aligned in the xx 'direction. In chiral chiral, the organic molecules 242 and the chiral material 190 are aligned parallel to the first electrode and the second electrode, and in the y-axis direction, the long axis of the organic molecules 242 rotates helically. Can be sorted in such a way.

Since the alignment method of the organic molecules corresponds to those described in the fourth modification of the first embodiment, detailed description thereof will be omitted.

Hereinafter, the effect according to the third modification of the second embodiment of the present invention will be described. According to the third modified example of the second embodiment of the present invention, the organic molecules 242 of the emission layer 240 may be aligned in a specific direction, for example, the x-x 'direction of FIG. 13. Accordingly, the light emitted from the emission layer 240 may have linear polarization. In addition, the linearly polarized light generated by the emission layer 240 may have a polarization state that rotates in the first direction and the second direction by a spiral structure in which the organic molecules 242 are twisted in layers.

In this case, since the light emitting layer 240 emits linearly polarized light by the alignment of the organic molecules 242, the efficiency of polarization rotating in the first direction and the second direction may increase. In other words, when the light emitting layer 240 emits light linearly polarized by the alignment of the organic molecules 242, the circularly polarized light efficiency (elliptical polarization efficiency) may be increased. Can be. Accordingly, since the ratio of the light passing through the polarization layer 280 among the first light Lin1 and the second light Lin2 described with reference to FIG. 10 is increased, the light efficiency may be further improved.

In the above, the structure and effects of the third modification of the second embodiment of the present invention have been described. In the third modification of the second embodiment of the present invention, the organic molecules of the light emitting layer 240 are described as being aligned, but other layers other than the light emitting layer 240 of the light emitting layer 205 may be aligned. Of course.

Specifically, the technical idea of the third modified example may be applied to the first modified example of the second embodiment. In this case, the organic molecules of the hole transport layer 230 and the electron transport layer 250 including the chiral material 290 may be aligned in a specific direction, for example, x-x 'direction.

In addition, the technical idea of the third modified example may be applied to the second modified example of the second embodiment. In this case, the organic molecules of the hole injection layer 220 and the electron injection layer 260 including the chiral material 290 may also be aligned in a specific direction, for example, x-x 'direction.

Of course, the technical spirit of the second embodiment, the first modified example, the second modified example, and the third modified example of the present invention may be implemented in combination with each other.

The above-described display according to the second embodiment of the present invention, modifications thereof can be applied to the top light emitting display device.

Referring to FIG. 14, the upper light emitting display device may include a substrate S. FIG.

For each of the subpixels, a light emission layer LG may be formed on the anode AE. For example, the light emission layer LG may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. In this case, the light emitting layer may be provided to emit light of different colors for each subpixel. As a result, light of different colors can be emitted for each subpixel.

The upper light emitting display device may emit the generated light in a direction opposite to the substrate. Accordingly, the upper light emitting display device has an advantage that the space in which the transistor element T can be formed is large and the aperture ratio is improved.

The light emitting layer of the second exemplary embodiment and modified examples thereof may be applied to the light emitting layer LG of the upper light emitting display device.

Hereinafter, the experimental examples of the present invention and the superiority of the present invention will be described.

For the experiment, a top-emitting display according to an embodiment of the present invention was prepared. More specifically, the display according to the first experimental example is formed on an anode electrode made of LiF / Al, a hole blocking layer made of TPBi, and a hole blocking layer made of TPBi, and F8BT is a light emitting molecule and twists R5011 to the right. A light emitting layer made of a chiral dopant providing an angle, a hole transport layer formed on the light emitting layer and made of polyimide, a hole injection layer formed on the hole transport layer and made of CuPC, and a cathode electrode made of ITO and formed of ITO To prepare. At this time, the display according to the first experimental example oriented the hole transport layer made of polyimide, so that the light emitting molecules are aligned. That is, the first experimental example may be regarded as corresponding to the third modified example of the second exemplary embodiment.

In addition, as a second experimental example, a display made of the same material as the first experimental example but not oriented was prepared. That is, the second experimental example may be regarded as corresponding to the second exemplary embodiment.

In order to contrast with the first and second experimental examples of the present invention, a first comparative example and a second comparative example without the chiral dopant of R5011 were prepared. In particular, the light emitting layer of the first comparative example was configured to include unoriented F8BT light emitting molecules, and the light emitting layer of the second comparative example was configured to include oriented F8BT light emitting molecules. As described above, the light emitting layers of the first comparative example and the second comparative example do not include a chiral dopant.

Table 1 is a table comparing the characteristics of the first experimental example, the second experimental example, the first comparative example and the second comparative example.

구분division	제1 실험 예Experimental Example	제2 실험 예Experimental Example 2	제1 비교 예First Comparative Example	제2 비교 예Second comparison example
sample onlysample only	40294029	40314031	40234023	40144014
우원 편광판UW polarizer	28612861	24902490	18391839	18001800
좌원 편광판Left circle polarizer	792792	11751175	18191819	18371837
Sum of R+LSum of R + L	36523652	36653665	36583658	36373637
원편광비Circular polarization ratio	3.613.61	2.122.12	1.011.01	0.970.97
효율향상efficiency improvement	56.6%56.6%	35.9%35.9%	기준standard	기준standard
g-factorg-factor	-1.13-1.13	-0.71-0.71	00	00

The sample only described in the division column of Table 1 means the intensity of the emitted light when the polarizer is not formed on the exit surface, and the right and left circle polarizers mean the intensity of the emitted light when the right / left polarizer is formed on the exit plane, respectively. do. Sum of R + L refers to the intensity of light passing through the left / right polarizer.

Referring to Table 1, in the first comparative example and the second comparative example, since the g-factor of the light generated in the light emitting layer is 0 it can be confirmed that the polarization state. In contrast, in the case of the first experimental example, it was confirmed that the g-factor of the light generated in the light emitting layer was -1.13, which increased the efficiency to about 60%. In addition, in the case of the second experimental example, it was confirmed that the g-factor of the light generated in the light emitting layer is -0.71, which increases the efficiency by about 40%.

The reason for the increase of the g-factor is that the chiral dopants included in the first and second experimental examples provide the torsion angles to the light emitting molecules, so that the light generated by the light emitting molecules is rotated by the spiral structure formed of the light emitting molecules. It is interpreted as having a polarization state.

In the meantime, in the foregoing description of the first and second embodiments, the present inventors prepared the first and second embodiments, in which the R5011 chiral dopant provided a helical structure to the light emitting molecules of F8BT. A heat treatment process was performed to provide. Reference will be made to FIG. 15 to describe the heat treatment process.

15 is a view for explaining the effect of the heat treatment process on the formation of the spiral structure according to an embodiment of the present invention.

Referring to FIG. 15 (a), it was confirmed that the F8BT light emitting molecules did not have a helical structure simply by including the R5011 chiral dopant in the light emitting molecules made of F8BT. In FIG. 15A, the red color indicates an alignment direction of the light emitting layer, and an angle means an angle between the polarization direction and the alignment direction of the polarizing layer. As shown in FIG. 15A, it can be seen that there is no change in light intensity despite the change in the alignment direction and the polarization direction. This means that the luminescent molecules are isotropic with no alignment.

In contrast, referring to FIG. 15 (b), when the thermal annealing is performed at 140 ° C. or higher with the R5011 chiral dopant included in the F8BT-containing light emitting molecules, the light emitting molecules are cooled to the chiral dopant. It shows that it has a spiral laminated structure. More specifically, in the case of cooling after the phase transition to a meso phase (mesophase) through thermal annealing, the light emitting molecules may have a spiral stacked structure. As shown in FIG. 15B, when the orientation direction and the polarization direction are changed, it may be confirmed that the intensity of the emitted light is changed. This means that the light emitting molecules are arranged in a spiral stacked structure by HTP provided by a chiral dopant by heat treatment.

The heat treatment process described with reference to FIG. 15 may be applied to the above-described first embodiment, its modifications, the second embodiment, and its modifications.

Hereinafter, the effects of the present invention will be collectively described with reference to FIG. 16.

Figure 16 (a) shows a conventional display, Figure 16 (b) shows a display according to an embodiment of the present invention. In general, the display according to FIGS. 16A and 16B may provide an external light reflection function.

However, there is a remarkable difference in light emission efficiency. In the case of the conventional display shown in Fig. 16A, the light generated in the light emitting layer is composed of 50% of the first light L1 'facing the emission surface and 50% of the second light L2' facing the lower electrode. . At this time, the first light L1 'and the second light L2' do not have a specific polarization state. In this case, only 25% of the first light L1 ′ corresponding to 50% of the total light generated may pass through the circular polarization layer. That is, when the circular polarizing layer is the right polarizing layer, only half of the light having the right circular polarization state among the first light L1 ′ may pass through the circular knitting layer. By the same principle, only 25%, which is 50% of the second light L2 ′ corresponding to 50% of the total light generated, may pass through the circular polarization layer. Therefore, the emission efficiency of the conventional display remained at 50%.

In contrast, in the display according to the exemplary embodiment of FIG. 16B, since the light emitting molecules have a spiral stacked structure by the chiral dopant, light polarized in a specific direction is generated. That is, the light directed to the emission surface corresponding to 50% of the total generated light is composed of L1a having a polarization state in the clockwise direction of 40% and L1b having a polarization state in the counterclockwise direction of 10%. Further, the light directed to the lower electrode corresponding to 50% of the total generated light is composed of L2a having a polarization state in the counterclockwise direction of 40% and L2b having a polarization state in the clockwise direction of 10%. In this case, L1a and L2a, that is, light having a polarization state in the clockwise direction, that is, 80% of the total amount of light may pass through the right polarizing layer. Accordingly, in the case of the display according to the embodiment of the present invention, the emission efficiency is 80%, which may improve the efficiency of 60% compared to the conventional display.

Furthermore, according to an embodiment of the present invention, the chiral dopant is included to make the light emitting molecules have a spiral stacked structure. In contrast, simply adding a dopant having a helical structure or a helical structure itself has a limitation in that a low polarization ratio g-factor is required and a design for adjusting the color of generated light is required. However, in the embodiment of the present invention, the chiral dopant rotates the light emitting molecules themselves, such that the light emitting molecules have a spiral structure on the layer. Thus, the g-factor, which is the polarization ratio, can be significantly increased and can provide an effect that the process is easy.

Meanwhile, according to the above-described embodiments of the present invention, the chiral material has been described as being included in at least one layer of the light emission layer. Alternatively, a film containing a chiral material may be laminated between the individual layers that make up the light exit layer.

The first and second embodiments of the present invention and the modifications thereof have been described above with reference to FIGS. 1 to 16. Hereinafter, referring to FIGS. 17 to 21, a structure and a method for improving a g-factor of the above-described embodiments and modifications may be introduced. In this case, the g-factor may be defined by the following equation.

G-factor: 2 (IL-IR) / (IL + IR)

(IL: intensity of left circle polarization, IR: intensity of right circle polarization)

The g-factor enhancement structure and method are described below.

Hereinafter, a method of manufacturing a rotation polarization light emitting device that provides an improved g-factor will be described with reference to FIG. 17.

17 is a view for explaining a method of manufacturing a rotation polarization light emitting device according to an embodiment of the present invention. For convenience of description, the manufacturing method described with reference to FIG. 17 assumes a manufacturing method of the rotating polarization light emitting device described with reference to FIGS. 1 to 3, but is also applied to the rotating polarization light emitting device described with reference to FIGS. 4 and 16. Of course it can.

Referring to FIG. 17, in the method of manufacturing a rotating polarization light emitting device according to an embodiment of the present disclosure, forming a first electrode (S110) and forming a light emitting layer including light emitting molecules and a chiral dopant on the first electrode. It may include at least one of the step (S120) of forming a light emitting layer comprising a step (S130) of forming a second electrode on the light emitting layer. Hereinafter, each step will be described in detail.

In operation S110, a first electrode may be formed. The substrate may be prepared first for this purpose. On the substrate, a driving layer including at least one transistor and at least one capacitance for controlling each pixel through a photolithography process may be formed. On the driving layer, the first electrode 110 may be formed by a photolithography process or a liquid phase process. As a result, the first electrode 110 illustrated in FIG. 1 may be formed.

In operation S120, a light emission layer may be formed on the first electrode. In this case, the light emitting layer may be applied in a solution process, that is, a soluble process, when the organic molecules are polymers. In contrast, when the organic molecules are low molecular weight, they may be deposited through a vapor deposition process. The chiral material may be formed together with the light emitting layer, for example, a light emitting layer.

For example, an electrode injection layer, an electrode transport layer, an emission layer, an electron transport layer, and an electron injection layer may be sequentially formed on the first electrode. As a result, the light emission layer 105 illustrated in FIG. 1 may be formed.

Step S120 may control at least one of refractive index control of the light emitting layer, twist angle control of the light emitting molecules, emission zone control, and linear polarization state in order to provide an improved g-factor.

In this case, the refractive index control of the light emitting layer may be defined as the refractive index of the light emitting layer described above. The refractive index of the light exit layer may be defined according to the type of material forming the light exit layer.

The twist angle of the light emitting molecules may mean an angle at which the light emitting molecules are twisted in a layer by helical twisting power (HTP) provided by the chiral dopant. The twist angle of the light emitting molecules may be defined according to the type of dopant and the concentration of the dopant.

As the twist angle of the light emitting molecules increases, the g-factor may have the shape of a wave. According to an embodiment, the twist angle of the light emitting molecule may define a twist angle with a larger g-factor than the second peak within the twist angle range corresponding to the first peak of the sine wave. In addition, the twist angle of the light emitting molecules may be controlled to 180 degrees or less.

The emission zone may mean a zone where light is generated by electrons and holes in the emission layer. For example, in the lower emission method described with reference to FIG. 1, a g-factor may increase as the emission zone is closer to the electron transport layer 150. To this end, the emission zone may be moved toward the electron transport layer 150 through the hole transport layer 130. In another aspect, when the first electrode 110 is a transparent electrode and the second electrode 170 is a reflective electrode, the emission zone of the light emitting layer may be controlled to be close to the second electrode 170. More specifically, the emission zone of the light emitting layer may be controlled to be close to the second electrode 170 within 20% of the thickness of the light emitting layer.

The linearly polarized state means that light generated in the emission layer 140 has a linearly polarized state. This is to consider the phenomenon that the g-factor becomes higher when the light of the linearly polarized state generated in the light emitting layer 240 transitions to the rotationally polarized state while passing through the spiral stacked structure of the light emitting molecules described with reference to FIG. 2 (b). will be.

In order for the light emitting layer 140 to generate linearly polarized light, the light emitting molecules constituting the light emitting layer 140 should be aligned in a specific direction, and thus the alignment method of the light emitting molecules will be described.

In order to align the light emitting molecules of the light emitting layer 140, adjacent layers interfacing with the light emitting layer 140 may be aligned in a specific direction. For example, the hole transport layer 130 formed before the light emitting layer 140 may be aligned in a specific direction. Since the surface of the hole transport layer 130 is arranged in a specific direction, the light emitting layer 140 interfacing with the hole transport layer 130 may also be induced in a specific direction.

In operation S130, a second electrode may be formed. The second electrode 170 may be formed by a photolithography process or a liquid phase process. As a result, the second electrode 170 illustrated in FIG. 1 may be formed.

The method of manufacturing the rotation polarization light emitting device according to the exemplary embodiment of the present invention has been described above with reference to FIG. 17. Hereinafter, the experimental examples of the present invention and the superiority of the present invention will be described.

18 to 20 are graphs illustrating a rotation polarization ratio (g-facator) according to a twist angle of light emitting molecules according to an embodiment of the present invention.

First, ITO (thickness: 100 nm, first electrode) / CuPC (thickness: 2 nm, hole injection layer) / polyimide (thickness: 20 nm, alignment layer and hole transport layer) / F8BT (light emitting molecule) + R5011 (chiral A rotatable polarization light emitting device consisting of dopant) (thickness: 200 nm) / TPBi (thickness: 20 nm, hole blocking layer) / LiF: Al (1 nm: 70 nm, second electrode) was prepared. In addition, thermal annealing was performed at 140 ° C. or more in a state in which R5011 chiral dopant was included in F8BT, and the light emitting molecules were cooled at room temperature to give the light emitting molecules a spiral laminate structure according to an embodiment of the present invention. In addition, the hole transport layer was rubbed to align the light emitting molecules.

At this time, the refractive index of the light emitting layer was 0.67, and the light emitting zone was 0 nm, which is an interface between the light emitting layer and TPBi. From another viewpoint, the surface where the light emitting layer and TPBi interface is defined as a reference line of the light emitting zone.

As a result of the experiment, as shown in FIG. 18, the g-factor was repeatedly increased and decreased in the form of a sine wave as the spiral layer twist angle of the light emitting molecule was increased. Therefore, it can be confirmed that the spiral layer twist angle is preferably 180 degrees or less so as to include less chiral dopants.

The twist angle can also be defined as a value greater than the g-factor peak of the second of the first peaks. For example, when the emission zone is 0 nm, the twist angle may be a value between 14.73 degrees and 127.31 degrees. Thus, it is interpreted that the maximum g-factor can be derived with the minimum twist angle.

In addition, the g-factor was found to be affected by the position of the light emitting zone. If the g-factor of FIGS. 18 and 19 is negative, the left circle polarization is superior to the right polarization, and if the g-factor is positive, the right polarization is superior to the left circle polarization. It can be seen that the case where the position is 0 nm is the most dominant.

In addition, it can be seen that the polarization state of the light generated in the light emitting layer can be controlled by the left circularly polarized light or the right circularly polarized light by controlling the position of the light emitting zone while keeping other variables the same.

Meanwhile, referring to FIG. 20, the polarization states of Lin1 (indicated as top in FIG. 20) and Lin2 (indicated as bottom in FIG. 20) of FIG. 3 may be confirmed for each emission position. . Referring to FIG. 20, it can be seen that the polarization states of Lin1 and Lin2 are similar to the first valley of the g-factor until the position of the emission zone is 40 nm. In this case, it is expected that the light efficiency maximization described with reference to FIG. 3 will be performed more smoothly. Therefore, it may be preferable that the position of the light emitting zone is controlled to be within 40 nm which is within 20% in the hole transport layer direction at the total thickness of 200 nm of the light emitting layer.

18 to 20, the simulation result of the influence of the position and the twist angle of the light emitting zone on the g-factor has been described.

For the experiment, the rotation polarization light emitting device described with reference to FIGS. 18 to 20 was prepared. At this time, the layer twist angle of the light emitting molecules by chiral dopant was 60 degrees.

The horizontal axis in FIG. 21 means the position of the light emitting zone, and indicates the position of the light emitting zone relative to the thickness of 200 nm of the total light emitting layer. When the value of the emission zone is 0, the position where light is generated is an interface between the light emitting layer and TPBi, and when the value of the emission zone is 1.0, it means that the position where the light is generated is an interface between the light emitting layer and the polyimide.

Referring to FIG. 21, it can be seen that the influence of the refractive index on the g-factor is different depending on the position of the light emitting zone. That is, it can be seen that the position of the emission zone provides the highest g-factor when the refractive index is 1.1 from 0 to 0.23, and the position of the emission zone provides the highest g-factor when the refractive index is 1.5 from 0.23 to 0.87. Can be.

According to the rotating polarization light emitting device and the method of manufacturing the same according to an embodiment of the present invention described with reference to FIGS. 1 to 21, the light of the rotation polarization state is generated through the light emitting molecules having a spiral stacked structure through a chiral dopant. Can be. Thereby, the light efficiency can be improved by increasing the amount of light that can pass through the circular polarizing plate for blocking external light.

Further, according to the rotating polarization light emitting device according to an embodiment of the present invention and a manufacturing method thereof, at least one of the refractive index control of the light emitting layer, the twist angle control of the light emitting molecules, the emission zone control, the linear polarization state By controlling variables, you can improve the g-factor. Thereby, light efficiency can be improved more.

In addition, according to embodiments of the present invention, it is assumed that the light emitting layer is an organic light emitting layer. Alternatively, the inorganic light emitting layer may be, for example, a quantum light emitting layer. In this case, the light emitting layer itself may be composed of an inorganic light emitting layer. For example, the quantum emission layer may be formed of a quantum dot and / or a quantum rod. In this case, luminescent inorganic molecules such as quantum dots and / or quantum rods may also have a spiral stacked structure by chiral dopants, and the spiral stacked structure may change the polarization state of the emitted light as described above. And the quantum rod may be a nano-sized semiconductor material, and may be any one or more materials of group II-VI, group III-VI, group IV materials, and mixtures thereof. Specifically, the quantum dot and the quantum rod may include magnesium oxide (MgO), magnesium sulfide (MgS), magnesium selenide (MgSe), magnesium telluride (MgTe), calcium oxide (CaO), calcium sulfide (CaS), and calcium selenium. Nide (CaSe), calcium telluride (CaTe), strontium oxide (SrO), strontium sulfide (SrS), strontium selenide (SrSe), strontium telluride (SrTe), barium oxide (BaO), barium sulfide (BaS), Barium selenide (BaSe), barium telluride (BaTE), zinc oxide (ZnO), copper oxide (Cu2O), zinc sulfide (ZnS), zinc selenide (ZnSe), zinc telluride (ZnTe), cadmium oxide (CdO) ), Cadmium sulfide (CdS), cadmium selenide (CdSe), cadmium telluride (CdTe), mercury oxide (HgO), mercury sulfide (HgS), mercury selenide (HgSe), mercury telluride (HgTe), sulfide Aluminum (Al2S3), Aluminum Selenide (Al2Se3), Aluminum Telluride (A12Te3), Gallium Oxide (Ga2O3), Gallium Sulfide (Ga2S3), Gallium Selena Id (Ga2Se3), Gallium Telluride (Ga2Te3), Indium Oxide (In2O3), Indium Sulfide (In2S3), Indium Selenide (In2Se3), Indium Telluride (In2Te3), Germanium Oxide (GeO2), Tin Oxide (SnO2) , Tin sulfide (SnS), stannum selenide (SnSe), stannum telluride (SnTe), lead oxide (PbO), lead dioxide (PbO2), lead sulfide (PbS), lead selenide (PbSe), lead tellurium Ride (PbTe), Aluminum nitride (AlN), Aluminum phosphide (AlP), Aluminum arsenide (AlAs), Aluminum antimonide (AlSb), Gallium nitride (GaN), Gallium phosphide (GaP), Gallium arsenide (GaAs) , Gallium antimonide (GaSb), indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), indium antimonide (InSb), boron phosphide (BP), silicon (Si) or germanium ( Ge) may be made of at least one material.

In addition, in the description of an embodiment of the present invention, a case in which the light emitting layer is electroluminescence has been described, but the technical idea of the present invention is applied to the case in which the light emitting layer is photoluminescence.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment, Comprising: It should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

Claims

A first electrode disposed in the light output direction;

A second electrode facing the first electrode;

A first light disposed between the first electrode and the second electrode, the first light having a polarization state rotating in a first direction toward the first electrode, and directed toward the second electrode; A light emitting layer for emitting a second light having a polarization state rotating in a second direction that is a reverse direction; And

And a polarizing layer disposed in the light output direction with respect to the first electrode and configured to pass the light rotating in the first direction.
According to claim 1,

The second light is reflected by the second electrode, has a polarization state to rotate in the first direction and passes through the polarization layer,

As the external incident light passes through the polarization layer, the external incident light has a polarization state rotating in the first direction, and the external incident light having the polarization state rotating in the first direction is reflected by the second electrode. And a polarization state that rotates in the second direction, so that emission to the outside is blocked by the polarization layer.
According to claim 1,

The first direction and the second direction are directions defined on the basis of the viewpoint of viewing the second position from the first position on a light propagation path from the first position to the second position. .
The method of claim 3, wherein

The light emitting layer has a polarization state in which the first light emitted from the light emitting layer is rotated in the first direction toward the first electrode, and the second light emitted from the light emitting layer is the second light. And a chiral material that adjusts the layer twist angle of the light emitting molecules of the light emitting layer to have a polarization state that rotates in the second direction toward the second electrode.
The method of claim 4, wherein

And said layer twist angle is 180 degrees or less.
A first electrode;

A second electrode facing the first electrode and positioned in a light emission direction;

A first light disposed between the first electrode and the second electrode and emitting a first light having a polarization state rotating toward the second electrode in a first direction, and toward the first electrode, opposite to the first direction; A light emitting layer for emitting a second light having a polarization state rotating in a second direction that is a direction; And

And a polarizing layer disposed in the light output direction with respect to the second electrode and configured to pass light rotating in the first direction.
The method of claim 6,

The second light is reflected by the first electrode, has a polarization state to rotate in the first direction and passes through the polarization layer,

As the external incident light passes through the polarization layer, the external incident light has a polarization state rotating in the first direction, and the external incident light having the polarization state rotating in the first direction is reflected by the first electrode, And a polarization state that rotates in the second direction, so that emission to the outside is blocked by the polarization layer.
The method of claim 6,

The first direction and the second direction are directions defined on the basis of the viewpoint of viewing the second position from the first position on a light propagation path from the first position to the second position. .
The method of claim 8,

The light emitting layer has a polarization state in which the first light emitted from the light emitting layer is rotated in the first direction toward the second electrode, and the second light emitted from the light emitting layer is the second light. And a chiral material that adjusts the layer twist angle of the light emitting molecules of the light emitting layer to have a polarization state that rotates in the second direction toward the first electrode.
The method of claim 9,

And said layer twist angle is 180 degrees or less.
A first electrode;

A second electrode facing the first electrode;

A polarizing layer for selectively passing port or starboard light disposed outside the first electrode or the outside of the second electrode; And

And a light emission layer disposed between the first electrode and the second electrode and comprising a chiral material.

The chiral material is polarized in the port or starboard so that the light generated in the light emitting layer passes through the polarizing layer,

The light intensity generated in the light emitting layer measured outside the polarizing layer is. And a light emitting layer including the chiral material is stronger than the light emitting layer including the chiral material.
The method of claim 11, wherein

The light emitting layer includes a light emitting molecule,

And the light emitting molecules are aligned in a specific direction to emit linearly polarized light.
Non-chiral luminescent molecules; And

And a dopant that provides a twist angle in the thickness direction of the light emitting molecules to stack the light emitting molecules in a spiral structure.
The method of claim 13,

And the dopant provides a helical twisting power to the light emitting molecules to rotate the light emitting molecules at the torsion angle.
Forming a first electrode;

Forming a light emitting layer on the first electrode, the light emitting layer including a light emitting layer comprising a light emitting molecule and a chiral dopant; And

Forming a second electrode on the light emitting layer;

In the forming of the light emitting layer, the chiral dopant by adjusting the layer twist angle of the light emitting molecules, the g-factor of the light emitted from the light emitting layer is controlled, manufacturing method of a rotation polarized light emitting device.
The method of claim 15,

Forming the light exit layer,

Controlling at least one of controlling the layer twist angle, controlling the refractive index of the light emitting layer, and controlling the light emitting zone of the light emitting layer,

The light emitting zone of the light emitting layer is defined on the basis of the distance from any one of the first and second electrodes, the manufacturing method of the rotation polarization light emitting device.
The method of claim 16,

And the layer twist angle is controlled to 180 degrees or less.
The method of claim 17,

When the first electrode is a transparent electrode and the second electrode is a reflective electrode, the light emitting zone of the light emitting layer is controlled to be close to the second electrode.
The method of claim 18,

And a light emitting zone of the light emitting layer is controlled to be close to the second electrode within 20% of the thickness of the light emitting layer.
The method of claim 16,

The refractive index of the light emitting layer is controlled according to the position of the light emitting zone of the light emitting layer.