KR20190000759A - Display apparatus - Google Patents

Abstract

A display device is disclosed. The disclosed display device comprises a structure in which at least one blue light emitting unit and at least one green light emitting unit are stacked, and also may include: an OLED substrate generating light in which a blue color and a green color are mixed; a color control unit controlling colors of the light generated from the OLED substrate. The OLED substrate may comprise a tandem structure, and for example, may include a first blue light emitting unit, a green light emitting unit, and a second blue light emitting unit. The color control unit may comprise: a first color adjusting factor containing a first quantum dot for a green conversion; a second color adjusting factor containing a second quantum dot for a red conversion; a third color adjusting factor expressing a blue color; a first color filter provided on the first color adjusting factor; and a second color filter provided on the second color adjusting factor. The present invention may implement a display device having a high efficiency and an excellent color characteristic.

Description

[0001]

The disclosed embodiments relate to a display device.

BACKGROUND ART [0002] Organic light emitting devices (OLEDs) are self-luminous devices that have wide viewing angles, excellent contrast, high response speed, excellent characteristics in terms of driving voltage and brightness, It is possible.

The organic light emitting device may include an anode, a cathode, and a light emitting layer (an organic material containing light emitting layer) interposed therebetween. A hole transporting region may be provided between the anode and the light emitting layer, and an electron transporting region may be provided between the light emitting layer and the cathode. The holes injected from the anode can move to the light emitting layer via the hole transporting region, and the electrons injected from the cathode can move to the light emitting layer via the electron transporting region. Carriers such as holes and electrons may recombine in the light emitting layer to generate excitons and light may be generated as the excitons are changed from an excited state to a ground state.

In a display of an organic light emitting diode (OLED) type including a plurality of quantum dot color conversion elements, a blue OLED substrate or a white OLED substrate is mainly used as a light source.

A display device having excellent performance is provided.

A display device having high efficiency and excellent color characteristics is provided.

And a green light is applied to the light source OLED.

A display device that applies green light and blue light to a light source OLED and uses a plurality of quantum dot color conversion elements and a plurality of color filter elements.

According to an aspect of the present invention, there is provided an organic light emitting device (OLED) substrate including a structure in which at least one blue light emitting unit and at least one green light emitting unit are stacked, and generates light mixed with blue light and green light; And a color control unit provided on the OLED substrate for controlling a color of light emitted from the OLED substrate, wherein the color control unit includes a first color control element including a first quantum dot for green conversion, A second color control element including a second quantum dot for conversion, a third color control element for blue color expression, a first color filter provided on the first color control element, and a second color control element provided on the second color control element. A display device including a second color filter is provided.

The OLED substrate may have a tandem structure.

The OLED substrate may include a first blue light emitting unit, a green light emitting unit and a second blue light emitting unit sequentially stacked, and the green light emitting unit may be disposed between the first and second blue light emitting units.

A first charge generation layer provided between the first blue light emitting unit and the green light emitting unit; And a second charge generation layer provided between the green light emitting unit and the second blue light emitting unit.

The green light emitting unit may include an organic material-based green light emitting layer, and the green light emitting layer may include a thermally activated delayed fluorescence (TADF) dopant.

The green light emitting unit may include an organic material-based green light emitting layer, and the green light emitting layer may include a phosphorescent dopant, wherein the dopant satisfies T1 (dopant) S1 (dopant) T1 (dopant) + 0.5 eV . Here, T1 (dopant) is a triplet energy level (eV) of the dopant, and S1 (dopant) is a singlet energy level (eV) of the dopant.

The dopant may be an organometallic compound including iridium (Ir).

The dopant may be at least one selected from the group consisting of Pt, Os, Ti, Zr, Hf, Eu, Terbium, Tm, Rh, Ru, rhenium, beryllium, magnesium, aluminum, calcium, manganese, cobalt, copper, zinc, gallium (Ga), germanium (Ge), rhodium (Rh), palladium (Pd), silver (Ag), or gold (Au).

The dopant may be an organic metal compound having a square-planar coordination structure.

The dopant may include a metal M and an organic ligand, and the metal M and the organic ligand may form one, two, or three cyclometallated rings.

The dopant may comprise a metal M and a quaternary coordinating organic ligand capable of forming three or four cyclometallated rings. M is at least one element selected from the group consisting of Pt, Os, Ti, Zr, Hf, Eu, Terbium, Tm, Rh, Ru, rhenium, beryllium, magnesium, aluminum, calcium, manganese, cobalt, copper, zinc, gallium Ga, Ga, Ge, Rh, Pd, Ag, or Au, and the quadrivalent organic ligand may include a benzimidazole group or a pyridine group. have.

The first color filter may be a blue cut filter, and the second color filter may be a blue and green cut filter.

The first color filter may be an absorption type green color filter, and the second color filter may be an absorption type red color filter.

The third color control element may include a blue color filter, and a light scattering element may be further disposed between the blue color filter and the OLED substrate.

The third color adjustment element may include a color conversion element having a third quantum dot for blue conversion, and a third color filter may be further provided on the third color adjustment element.

The third color filter may be a green cut filter.

The third color filter may be an absorption type blue color filter.

The core portion of the second quantum dot may have a larger size than the core portion of the first quantum dot.

Wherein the first color adjustment element corresponds to a first subpixel area, the second color adjustment element corresponds to a second subpixel area, the third color adjustment element corresponds to a third subpixel area, The apparatus may further include three sub-pixel regions, and the fourth sub-pixel region may be configured to display a different color from the first through third sub-pixel regions.

The four sub-pixel regions may be blank regions without color control elements on the OLED substrate, or may include light scattering elements provided on the OLED substrate.

And a selective reflection film provided between the OLED substrate and the color control unit.

The selective reflection layer may be configured to transmit blue light and green light and reflect red light.

And a TFT array substrate having a plurality of thin film transistors (TFTs) for driving pixel regions of the OLED substrate.

According to another aspect, various electronic apparatuses to which the above-described display apparatus is applied are provided.

A display device having high efficiency and excellent color characteristics can be realized. A display device in which green light is applied to the light source OLED can be realized.

It is possible to implement a display device having excellent performance by applying green light and blue light to the light source OLED and using a plurality of quantum dot color conversion elements and a plurality of color filter elements.

1 is a cross-sectional view illustrating a display device according to an embodiment.
2 is a cross-sectional view illustrating a display device according to another embodiment.
3 is a cross-sectional view illustrating a display device according to another embodiment.
4 is a cross-sectional view illustrating a display device according to another embodiment.
5 is a cross-sectional view illustrating a display device according to another embodiment.
6 is a cross-sectional view illustrating a display device according to another embodiment.
7 is a cross-sectional view illustrating a display device according to another embodiment.
8 is a cross-sectional view illustrating a display device according to another embodiment.
FIG. 9 is a cross-sectional view showing a configuration of a display device according to an exemplary embodiment in more detail.
10 is a cross-sectional view showing a more specific configuration of an OLED substrate that can be applied to a display device according to an exemplary embodiment.
11 is a cross-sectional view showing the configuration of a display device according to an exemplary embodiment in more detail.
12 is a graph showing photoluminescence (PL) quantum yield (%) according to wavelengths of a green-QD-containing color conversion element and a red-QD-containing color conversion element applicable to a display device according to an embodiment.
13 is a graph showing a change in transmittance (%) according to wavelengths of the green-QD-containing color conversion element and the red-QD-containing color conversion element applicable to the display device according to the embodiment.
14 is a graph showing an emission spectrum of an OLED substrate applicable to a display device according to an embodiment.
15 is a graph showing an emission spectrum after light generated from an OLED substrate (light source) passes through a green-QD-containing color conversion element according to an embodiment.
16 is a graph showing an emission spectrum after light generated in an OLED substrate (light source) passes through a red-QD-containing color conversion element according to an embodiment.
17 is a graph showing a change in transmittance (%) according to wavelength of an absorption type color filter applicable to a display device according to an embodiment.
18 is a graph showing a change in transmittance (%) according to the wavelength of a cut-off type color filter applicable to the display device according to the embodiment.
FIG. 19 is a graph showing a change in transmittance (%) according to wavelength of an absorption type color filter applicable to a display device according to an embodiment.
20 is a graph showing the difference between spectral radiance when a light scattering agent is applied to blue light and when spectral radiance is not applied to blue light.
21 is a graph showing a change in current efficiency (cd / A) according to various conditions constituting the display device.
22 is a graph showing a change in color characteristics (%) according to various conditions constituting the display device.

Hereinafter, a display device according to embodiments will be described in detail with reference to the accompanying drawings. The width and thickness of the layers or regions illustrated in the accompanying drawings may be somewhat exaggerated for clarity and ease of description. Like reference numerals designate like elements throughout the specification.

1 is a cross-sectional view illustrating a display device according to an embodiment.

Referring to FIG. 1, an organic light emitting device (OLED) substrate 100 may be provided, and a color controller 200 may be provided to control the color of light emitted from the OLED substrate 100.

The OLED substrate 100 may be referred to as a light source OLED. The OLED substrate 100 may include a structure in which at least one blue light emitting unit and at least one green light emitting unit are stacked. The blue light emitting unit may emit blue light having a peak wavelength band of about 440 to 500 nm or about 450 to 480 nm and the green light emitting unit may emit blue light having a peak wavelength band of about 500 to 550 nm or 510 to 540 nm And can emit green light. Accordingly, the OLED substrate 100 can emit light mixed with blue light and green light. The blue light emitting unit may include a blue phosphor and / or a blue phosphor. The green light emitting unit may include a green phosphor and / or a green phosphor.

For example, the OLED substrate 100 may include a first blue light emitting unit 20, a green light emitting unit 30, and a second blue light emitting unit 40. A green light emitting unit 30 may be disposed between the first blue light emitting unit 20 and the second blue light emitting unit 40. The green light emitting unit 30 and the second blue light emitting unit 40 may be sequentially stacked on the first blue light emitting unit 20. The lifetime of each of the blue light emitting units 20 and 40 may be shorter than the lifetime of the green light emitting unit 30 so that the number of the blue light emitting units 20 and 40 and the number of the green light emitting units 30, May be advantageous. A green light emitting unit 30 may be used between two blue light emitting units 20 and 40 in consideration of light emitting efficiency, life span, performance, and the like. However, the configuration of the OLED substrate 100 can be variously changed.

The OLED substrate 100 may have a tandem structure. At this time, a first charge generation layer (not shown) may be provided between the first blue light emitting unit 20 and the green light emitting unit 30. Further, a second charge generating layer (not shown) may be provided between the green light emitting unit 30 and the second blue light emitting unit 40. The tandem structure and the first and second charge generation layers will be described later in detail with reference to FIGS. 9 and 10. FIG. In addition, the OLED substrate 100 may further include a predetermined lower layer below the first blue light emitting unit 20, and may further include a predetermined upper layer on the second blue light emitting unit 40. In FIG. 1, the lower layer and the upper layer are not given the same reference numerals, but they can be regarded as elements included in the OLED substrate 100. The lower layer and the upper layer will be described later in more detail with reference to FIG. 9 and FIG. 11 and the like.

A color control unit 200 may be provided on one surface of the OLED substrate 100. The color control unit 200 includes a first color adjustment element 70a including a first quantum dot QD for green conversion, a second color adjustment element 70b including a second quantization point for red conversion, And a third color adjustment element 75c for blue color expression. The color controller 200 further includes a first color filter 80a provided on the first color adjusting element 70a and a second color filter 80b provided on the second color adjusting element 70b can do.

The first color adjusting element 70a may be a Green-QD-containing layer and may convert light generated from the OLED substrate 100 into green (G). The second color adjusting element 70b may be a Red-QD-containing layer, and may convert light generated from the OLED substrate 100 into red (R). Accordingly, the first color adjustment element 70a may be a color converter or color conversion element, and the second color adjustment element 70b may be a second color conversion element. The color conversion element may be formed by mixing a resin material with predetermined quantum dots and a light scattering agent. The resin material may comprise, for example, a photoresist (PR) material. The third color adjusting element 75c may be a color filter that selectively passes a blue (B) wavelength region in the light generated from the OLED substrate 100. [ In other words, the third color adjustment element 75c may be a Blue-color filter (C / F). In this case, the third color adjusting element 75c may be an absorption type color filter including a predetermined pigment, a dye, or a quantum dot. The absorption type color filter can absorb light in the remaining wavelength band except light in the target wavelength band.

The first color filter 80a may block the wavelength of the blue color region remaining in the light passing through the first color adjusting element 70a. The second color filter 80b may block the wavelength of the blue and green regions remaining in the light passing through the second color adjusting element 70b. The first color filter 80a may be a blue-cut filter, and the second color filter 80b may be a blue or green-cut filter. Therefore, the color control / filtering characteristics can be improved by the first and second color filters 80a and 80b. Although not shown, a separate optical film may be further provided on the third color adjusting element 75c. The full color of RGB can be implemented by the color controller 200. Here, the arrangement order and the arrangement manner of RGB subpixels are illustrative and can be variously changed.

The first quantum dot that may be included in the first color adjustment element 70a may be Green-QD and the second quantum dot that may be included in the second color adjustment element 70b may be Red-QD. The quantum dot means a semiconductor particle of a small sphere having a size of nanometer (nm) or the like, and may have a size (diameter) of about several nm to several tens nm. The quantum dot may have a monolithic structure or may have a core-shell structure, and in the case of a core-shell structure, it may have a single-shell or multi-shell structure. For example, it may be composed of a core part (core body) made of a first semiconductor and a shell part (shell part) made of a second semiconductor. As the core material, cadmium selenide (CdSe), cadmium telluride (CdTe), cadmium sulfide (CdS) and the like can be used. As the shell part material, zinc sulfide (ZnS) Can be used. In addition, non-cadmium-based quantum dots (QD) can be used. That is, various materials not containing cadmium (Cd) can be applied to the quantum dots. However, the materials specifically presented here are illustrative, and various other materials can be applied to quantum dots. For example, the quantum dot may include at least one of a II-VI series semiconductor, a III-V series semiconductor, a IV-VI series semiconductor, and a IV series semiconductor.

Since quantum dots are very small in size, they can exhibit a quantum confinement effect. When the particle size is very small, the electrons in the particle form a discontinuous energy state due to the outer wall of the particle. The smaller the size of the space in the particle, the higher the energy state of the electron becomes and the larger the energy band gap becomes, Effect. According to such a quantum confinement effect, when light such as ultraviolet rays or visible light is incident on the quantum dots, light of a wide range of wavelengths can be generated. The wavelength of light generated in the quantum dots can be determined by the size, material, structure, etc. of the particles (quantum dots). Specifically, when light having a wavelength larger than the energy band gap is incident on the quantum dots, the quantum dots absorb the energy of the light and are excited, and can emit light of a specific wavelength and become a ground state. In this case, as the size of the quantum dots (or the core portion of the quantum dots) is smaller, light of a relatively short wavelength, for example, blue light or green light can be generated, The larger the size of the incident light, the longer the wavelength of light, for example, the red light can be generated. Therefore, light of various colors can be realized according to the size of the quantum dot (or the core portion of the quantum dot). Quantum dot particles capable of emitting green light can be referred to as green quantum dot particles, and quantum dot particles capable of emitting red light can be referred to as red quantum dot particles. have. For example, the green light quantum dot particle (or core portion) may be a particle having a width (diameter) of about 2 nm to about 3 nm, and the red light quantum dot particle (or core portion) ) May be from about 5 nm to about 6 nm. The emission wavelength can be controlled not only by the size (diameter) of the quantum dots but also by the constituent materials and structures.

The first color adjustment element 70a can be referred to as a " first QD color filter "since it can be regarded as a kind of color filter for converting color using quantum dots. Similarly, the second color adjustment element 70b may be referred to as a "second QD color filter ".

The first color filter 80a and the second color filter 80b of the cut-off filter type can be formed, for example, in a DBR (distributed Bragg reflector) structure. The DBR structure for passing or reflecting only a desired wavelength band can be made by repeatedly stacking two material layers (dielectric materials) having different refractive indexes by adjusting the thickness and the number of layers of the material layer, Or to the second color filter 80b. For example, the SiO ₂ layer and the TiO ₂ layer can be repeatedly laminated under the condition of? / 4 (where? Is the wavelength of light), and the reflectance or transmittance of a desired wavelength band can be increased by controlling the thicknesses and the number of layers . The DBR structure is well known, and a detailed description thereof is excluded. Also, at least one of the first color filter 80a and the second color filter 80b may have a structure other than the DBR structure, for example, a high-contrast grating (HCG) structure.

According to another embodiment, a light scattering element may be further provided between the third color adjusting element 75c and the OLED substrate 100 in Fig. An example thereof is shown in Fig.

Referring to FIG. 2, a light scattering element 71c may further be provided between the third color adjusting element 75c and the OLED substrate 100. FIG. At this time, the third color adjustment element 75c may be a blue-color filter (C / F). The light scattering element 71c may include a resin material and a light scattering agent. Here, the resin material may include a photoresist (PR) material. The light scattering agent may include, but is not limited to, titanium oxide (TiO ₂ ) and the like. Since each of the first and second color adjusting elements 70a and 70b may include a light scattering agent, the light scattering element 71c may be provided below the third color adjusting element 75c to balance the color saturation . In other words, it is possible to minimize the change in the visibility between the RGB regions. 2, reference numeral 201 denotes a color controller.

According to another embodiment, a color conversion element containing a quantum dot (Blue-QD) can be used in place of the Blue-color filter (C / F) as the third color adjustment element 75c in FIG. An example thereof is shown in Fig.

Referring to FIG. 3, a blue-QD-containing layer can be used instead of the blue-color filter (C / F) as the third color adjusting element 70c, similar to FIG. The third color adjusting element 70c may convert the light generated from the OLED substrate 100 into blue (B). Accordingly, the third color adjustment element 70c may be referred to as a third color conversion element. The third color adjusting element 70c may include a resin material, quantum dots, and a light scattering agent. In this case, the color controller 202 may further include a third color filter 80c provided on the third color adjusting element 70c. The third color filter 80c may block the wavelength of the green region remaining in the light passing through the third color adjusting element 70c. That is, the third color filter 80c may be a green-cut filter.

According to another embodiment, an absorptive color filter can be used in place of the first and second color filters 80a and 80b of the cutoff filter scheme of Figs. An example thereof is shown in Fig. Figure 4 is a modification of the embodiment of Figure 2.

4, an absorption-type green-color filter (C / F) can be used instead of a blue-cut filter as the first color filter 75a, and blue, green-cut You can use an absorptive red-color filter (C / F) instead of a filter. The green-color filter 75a may selectively transmit light in the green wavelength region and absorb light in the remaining wavelength region. Similarly, the red-color filter 75b can selectively transmit light in the red wavelength region and absorb light in the remaining wavelength region. The color controller 203 of this embodiment uses absorption color filters 75a, 75b, and 75c commonly in the R-subpixel, G-subpixel, and B-subpixel areas. Instead of the light scattering element 71c in this embodiment, a third color adjusting element 70c containing Blue-QD of Fig. 3 may be used.

According to another embodiment, the display device further includes a fourth sub-pixel region in addition to the R-subpixel (first subpixel), G-subpixel (second subpixel), B-subpixel . The fourth sub-pixel may be configured to display a different color (fourth color) in addition to R, G, and B. The other color (fourth color) may be, for example, cyan (C), but is not limited thereto. The case where the fourth sub-pixel region is further provided is exemplarily shown in Figs. 5 to 8. Fig. 5 to 8, reference numeral 100a denotes an OLED substrate, and reference numerals 200a to 203a denote color control units.

Referring to FIG. 5, similar to FIG. 1, a portion of the OLED substrate 100a may be left as a blank region. The blank region may correspond to a fourth sub-pixel region from which a cyan (C) color may appear.

Referring to FIG. 6, similar to FIG. 2, a light scattering element 71d may be provided in the fourth sub-pixel region of the OLED substrate 100a. If the light scattering element 71c provided under the third color adjusting element 75c is referred to as a first light scattering element, the light scattering element 71d provided in the fourth sub pixel region may be referred to as a second light scattering element. The first light-scattering element 71c and the second light-scattering element 71d may have the same or similar material composition.

Referring to FIG. 7, similar to FIG. 3, a light scattering element 71d may be provided in the fourth sub-pixel region of the OLED substrate 100a.

Referring to FIG. 8, similar to FIG. 4, a light scattering element 71d may be provided in the fourth sub-pixel region of the OLED substrate 100a.

In the embodiment of FIGS. 5 to 8, the R-subpixel (the first subpixel), the G-subpixel (the second subpixel), the B- Pixel) regions are exemplary and can be varied in various ways. For example, the R, G, B, and C subpixel regions may be arranged to form a square matrix, as viewed from above. In addition, the color appearing in the C-subpixel (fourth subpixel) region can be changed to a color other than cyan (C).

FIG. 9 is a cross-sectional view showing a configuration of a display device according to an exemplary embodiment in more detail.

9, a TFT array substrate 1 including a plurality of thin film transistors (TFT) (not shown) may be provided, and an OLED substrate 101 may be provided on the TFT array substrate 1. [ . A plurality of TFTs of the TFT array substrate 1 may be elements for driving pixel (sub-pixel) regions of the OLED substrate 101. A color control unit 201 may be provided on the OLED substrate 101.

The OLED substrate 101 may include a plurality of first electrodes 10a, 10b, and 10c. The plurality of first electrodes 10a, 10b, and 10c may be patterned elements corresponding to the respective sub-pixel regions. Each of the plurality of first electrodes 10a, 10b, and 10c may be electrically connected to each TFT element of the TFT array substrate 1. [ The first blue light emitting unit 20, the green light emitting unit 30 and the second blue light emitting unit 40 may be sequentially stacked on the plurality of first electrodes 10a, 10b, and 10c. A first charge generating layer 25 may be provided between the first blue light emitting unit 20 and the green light emitting unit 30. A second charge generating layer 35 may be provided between the green light emitting unit 30 and the second blue light emitting unit 40. Therefore, it can be said that the first blue light emitting unit 20, the green light emitting unit 30 and the second blue light emitting unit 40 are connected in series so as to form a tandem structure. And a second electrode 50 may be provided on the second blue light emitting unit 40. Here, although the second electrode 50 is shown as not patterned, in some cases, the second electrode 50 may be patterned with a plurality of electrode elements. The first electrode 10 may be an anode and the second electrode 50 may be a cathode, or vice versa. The second electrode 50 may be patterned without patterning the first electrode 10 or both the first electrode 10 and the second electrode 50 may be patterned. A plurality of light emitting units 20, 30, and 40 located between the first electrode 10 and the second electrode 50 and the charge generating layers 25 and 35 therebetween are also patterned in units of subpixels Lt; / RTI > A predetermined protective layer 60 may be further provided on the second electrode 50. The protective layer 60 may be formed of a transparent insulating material.

A color control unit 201 may be provided on the protective layer 60. The color control unit 201 has the same configuration as that of the color control unit 201 shown in FIG. 2, but the configuration can be modified in various ways.

10 is a cross-sectional view showing a more specific configuration of an OLED substrate that can be applied to a display device according to an exemplary embodiment. FIG. 10 shows a configuration that the OLED substrate 101 of FIG. 9 can have more specifically.

Referring to FIG. 10, a first blue light emitting unit 20a, a first charge generating layer 25, a green light emitting unit 30a, a second charge generating layer 35, The blue light emitting unit 40a and the second electrode 50 may be sequentially provided.

The first blue light emitting unit 20a may include a first blue light emitting layer EML1 including an organic material based blue light emitting material and may further include a first hole transporting layer HTL1 and a first electron transporting layer ETL1 . The first hole transport layer HTL1 may be disposed between the first blue emission layer EML1 and the first electrode 10 and the first electron transport layer ETL1 may be disposed between the first blue emission layer EML1 and the first charge generation layer (25). The green light emitting unit 30a may include a green light emitting layer EML2 including an organic material-based green light emitting material, and may further include a second hole transporting layer HTL2 and a second electron transporting layer ETL2. The second blue light emitting unit 40a may include a second blue light emitting layer EML3 including an organic material based blue light emitting material and may further include a third hole transporting layer HTL3 and a third electron transporting layer ETL3 . Although not shown, each of the first blue light emitting unit 20a, the green light emitting unit 30a, and the second blue light emitting unit 40a may further include at least one of a hole injecting layer and an electron injecting layer. The first and second charge generating layers 25 and 35 can be formed of a metal or a metallic material and can improve the luminous efficiency of the OLED substrate.

According to another embodiment, a predetermined "selective reflection film" may be further provided between the OLED substrate 101 and the color control section 201 in the structure shown in Fig. An example thereof is shown in Fig.

11, a selective reflection film 65 may be further provided between the OLED substrate 101 and the color control unit 201, similar to FIG. The selective reflection film 65 can be configured to transmit, for example, blue light and green light and reflect red light. The selective reflection film 65 may transmit a wavelength band of about 440 to 550 nm and reflect a wavelength band of about 610 to 760 nm. Therefore, the blue and green mixed light emitted from the OLED substrate 101 can be transmitted through the selective reflection film 65 and irradiated to the color control unit 201. Further, the red light emitted downward from the second color adjusting element 70b may be reflected by the selective reflection film 65 and emitted upward. The light efficiency can be improved by the selective reflection film 65. [ If necessary, the selective reflection film 65 can be selectively formed only on the lower portion of the second color adjustment element 70b.

The selective reflection film 65 can be formed, for example, in a DBR (distributed Bragg reflector) structure. By regulating the thickness of the material layer and the number of layers, it is possible to make a DBR structure that passes or reflects only a desired wavelength band, and this is applied to the selective reflection film 65 can do. For example, the first dielectric layer and the second dielectric layer can be repeatedly laminated, and the reflectance or transmittance of a desired wavelength band can be increased by adjusting the material, thickness, and number of layers of the layers. However, the configuration of the selective reflection film 65 is not limited to the DBR but may be varied. The selective reflection film 65 may have a dichroic mirror structure.

9 and 11, the TFT array substrate 1 is provided below the OLED substrate 101 and the color control unit 201 is disposed above the OLED substrate 101. However, The positional relationship may vary. When the OLED substrate 101 is a back emissive device other than a front emission type device, the color control unit 201 may be provided on a lower surface of the TFT array substrate 1. [ In addition, the configuration of the display device described with reference to Figs. 9 and 11 can be variously changed.

Hereinafter, the blue light emitting material and the green light emitting material applicable to the OLED substrate of the display device according to the embodiment will be described.

The green luminescent material or the blue luminescent material may include a phosphorescent dopant. The phosphorescent dopant can be selected, for example, from the following compounds PD1 to PD25, but is not limited thereto:

As described above, the phosphorescent dopant may include an organometallic compound including iridium (Ir), an organometallic compound including platinum (Pt), or an organometallic compound including osmium (Os) . In addition, various materials can be applied as phosphorescent dopants.

The light emitting layer of the green light emitting unit (green organic light emitting element) 30 may include an electron transporting host, a hole transporting host, and a dopant. The dopant may be an organic metal compound, and the dopant may or may not include iridium. That is, the dopant may be an iridium-containing or iridium-free organometallic compound. The dopant in the light emitting layer of the green light emitting unit (green organic light emitting element) 30 may be a phosphorescent compound. Such an organic light emitting device can be clearly distinguished from an organic light emitting device that emits fluorescence by a fluorescence mechanism.

According to one embodiment, the dopant of the light emitting layer may be doped with a dopant of T1 (dopant)? T1 (dopant) + 0.5 eV, for example, T1 (dopant)? S1 (dopant) However, the present invention is not limited thereto. Here, T1 (dopant) is the triplet energy level (eV) of the dopant in the light emitting layer, and S1 (dopant) is the singlet energy level (eV) of the dopant contained in the light emitting layer.

By satisfying the above-described range of the dopant (S1), the dopant in the light emitting layer has a high radiative decay rate even though the SOC (spin-orbital coupling) with the singlet energy level close to the triplet energy level is weak Lt; / RTI >

For example, the dopant may be an organometallic compound containing iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu) (Tb), thulium (Tm), rhodium (Rh), ruthenium (Ru), rhenium (Re), beryllium (Be), magnesium (Mg), aluminum (Al), calcium (Ca) May be an organometallic compound including Co, Cu, Zn, Ga, Ge, Rh, Pd, Ag or Au. have. For example, the dopant may be an organic metal compound including platinum (Pt) or palladium (Pd), but is not limited thereto.

According to another embodiment, the dopant in the light emitting layer may be an organic metal compound having a square-planar coordination structure.

According to another embodiment, the dopant in the light emitting layer may satisfy T1 (dopant)? Egap (dopant)? T1 (dopant) + 0.5 eV, but is not limited thereto. The Egap (dopant) is a difference between a HOMO (dopant) and a LUMO (dopant) of a dopant included in the light emitting layer, and the HOMO (dopant) (LUMO) energy level (eV) of the dopant contained in the light emitting layer, and the LUMO (dopant) is a highest occupied molecular orbital (HOMO) energy level (eV) of the dopant included in the light emitting layer. to be. The HOMO (dopant) and LUMO (dopant) are negative values measured by differential pulse voltammetry using ferrocene as a reference material, and the T1 (dopant) And the peak wavelength of the phosphorescence spectrum of the dopant. The dopant in the light emitting layer is -2.8 eV ≤ LUMO ≤ -2.3 eV, -2.8 eV ≤ LUMO (dopant) ≤ -2.4 eV, -2.7 eV ≤ LUMO (dopant) ≤ -2.5 eV, or -2.7 eV ≤ LUMO (dopant) ≤ -2.61 eV.

According to another embodiment, the dopant in the light emitting layer has a composition of -6.0 eV ≤ HOMO (dopant) ≤ -4.5 eV, -5.7 eV ≤ HOMO (dopant) ≤ -5.1 eV, -5.6 eV ≤ HOMO (dopant) Or -5.6 eV ≤ HOMO (dopant) ≤ -5.25 eV.

According to another embodiment, the dopant comprises a metal M and an organic ligand, and the metal M and the organic ligand may form one, two or three cyclometallated rings. The metal M may be iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), thulium (Rh), Ru, Ru, Ber, Mg, Al, Ca, Mn, Co, Cu, And may be zinc (Zn), gallium (Ga), germanium (Ge), rhodium (Rh), palladium (Pd), silver (Ag), or gold (Au).

According to another embodiment, the dopant may comprise a metal M and a four coordinating organic ligand capable of forming three or four (e.g., three) cyclometallated rings. For a description of the metal M, refer to what is described herein. The tetracoordinating organic ligand can include, but is not limited to, for example, benzimidazole and pyridine groups.

According to another embodiment, the dopant may comprise at least one ligand of a metal M and a ligand represented by the following formulas 1-1 to 1-4:

For example, when the metal M is iridium (Ir), it can be bonded to the ligand of the formula (1-1), and when the metal M is platinum (Pt), the ligand can be bonded to the ligand represented by the formula . The metal M is selected from the group consisting of Os, Ti, Zr, Hf, Eu, Terbium, Tm, Rh, Ru, Re, beryllium, magnesium, aluminum, calcium, manganese, cobalt, copper, zinc, gallium, germanium, The ligand may be combined with any one of the ligands represented by formulas (1-1) to (1-4) in the case of Ge, Ge, Rh, Pd, Ag or Au.

Among the above formulas 1-1 to 1-4,

A ₁ to A ₄ are, independently of each other, selected from a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group, a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group and a non-cyclic group And,

Y ₁₁ to Y ₁₄ are independently of each other, a chemical bond, O, S, N (R 91), B (R 91), P (R 91) or _{C (R 91) (R 92} ),

T ₁ to T _4, independently of each other a single bond, double _{bond, * -N (R 93) -} * ', * -B (R 93) - *', * -P (R 93) - * ', * _{-C (R 93) (R 94} ) - * ', * -Si (R 93) (R 94) - *', * -Ge (R 93) (R 94) - * ', * -S- *' , * -Se- * ', * -O- *', * -C (= O) - * ', * -S (= O) - *', * -S (= O) 2 - * ', * _{-C (R 93) = * '} , * = C (R 93) - *', * -C (R 93) = C (R 94) - * ', * -C (= S) - *' - and -C? C- * ',

A substituent of the substituted C ₅ -C ₃₀ carbocyclic group, a substituent of the substituted C ₁ -C ₃₀ heterocyclic group, and R ₉₁ to R ₉₄ independently of one another are hydrogen, deuterium, -F, -Cl, - Br, -I, -SF _5, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone jongi, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted Substituted or unsubstituted C ₁ -C ₆₀ alkyl group, a substituted or unsubstituted C ₂ -C ₆₀ alkenyl group, a substituted or unsubstituted C ₂ -C ₆₀ alkynyl group, a substituted or unsubstituted C ₁ -C ₆₀ alkoxy group, A substituted or unsubstituted C ₃ -C ₁₀ cycloalkyl group, a substituted or unsubstituted C ₁ -C ₁₀ heterocycloalkyl group, a substituted or unsubstituted C ₃ -C ₁₀ cycloalkenyl group, a substituted or unsubstituted C ₁ -C ₁₀ hetero cycloalkenyl group, a substituted or unsubstituted C ₆ -C ₆₀ aryl group, a substituted or unsubstituted C ₆ -C ₆₀ aryloxy group, a substituted or unsubstituted C ₆ -C ₆₀ arylthio group, a substituted or unsubstituted C ₁ -C ₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic heterocyclic condensed polycyclic group, -N from _{(Q 1) (Q 2)} , -Si (Q 3) (Q 4) (Q 5), -B (Q 6) (Q 7) , and _{-P (= O) (Q 8} ) (Q 9) Selected,

* ¹ , * ² , * ³ and * ⁴ are binding sites for the metal M of the dopant, respectively.

For example, the dopant includes a ligand represented by the above-mentioned Formula 1-3, wherein any two of A ₁ to A ₄ in the above Formula 1-3 are substituted or unsubstituted benzimidazole groups and substituted or unsubstituted An unsubstituted pyridine group, but is not limited thereto.

According to another embodiment, the dopant may be an organometallic compound represented by the formula (1A)

≪

≪ RTI ID =

M is at least one selected from the group consisting of beryllium (Be), magnesium (Mg), aluminum (Al), calcium (Ca), titanium (Ti), manganese (Mn), cobalt (Co), copper (Cu) ), Germanium (Ge), zirconium (Zr), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), rhenium (Re), platinum (Pt)

X ₁ is O or S, the bond between X ₁ and M is a covalent bond,

X ₂ to X ₄ independently of one another are C or N,

A bond between X ₂ and M, a bond between X ₃ and M and a bond between X ₄ and M is a covalent bond and the remaining two bonds are coordinate bonds,

Y ₁ and Y ₃ to Y ₅ independently of one another are C or N,

The bond between X ₂ and Y ₃ , the bond between X ₂ and Y ₄ , the bond between Y ₄ and Y ₅ , the bond between Y ₅ and X _51, and the bond between X ₅₁ and Y ₃ are chemical bonds,

CY ₁ to CY ₅ are independently selected from the group consisting of C ₅ -C ₃₀ carbocyclic groups and C ₁ -C ₃₀ heterocyclic groups, CY ₄ is not benzimidazole,

CY _5, CY _2, CY _3, and 6-membered cycloalkyl-metal cyclized (cyclometallated ring) formed by M, and

X ₅₁ is O, S, N - [( L 7) b7 - (R 7) c7], C (R 7) (R 8), Si (R 7) (R 8), Ge (R 7) (R _8), is selected from C (= O), N, C (R 7), Si (R 7) , and Ge (R _7),

R ₇ and R ₈ are optionally linked to one another through a first linking group to form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group Can,

L ₁ to L ₄ and L ₇ are each independently selected from a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group and a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group,

b1 to b4 and b7 are independently selected from integers of 0 to 5,

R ₁ to R ₄ , R ₇ and R ₈ independently represent hydrogen, deuterium, -F, -Cl, -Br, -I, -SF ₅ , a hydroxyl group, a cyano group, A hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C ₁ -C ₆₀ alkyl group, a substituted or unsubstituted C ₂ -C ₆₀ alkenyl group, Or a substituted or unsubstituted C ₂ -C ₆₀ alkynyl group, a substituted or unsubstituted C ₁ -C ₆₀ alkoxy group, a substituted or unsubstituted C ₃ -C ₁₀ cycloalkyl group, a substituted or unsubstituted C ₁ -C ₁₀ heterocyclo A substituted or unsubstituted C ₃ -C ₁₀ cycloalkenyl group, a substituted or unsubstituted C ₁ -C ₁₀ heterocycloalkenyl group, a substituted or unsubstituted C ₆ -C ₆₀ aryl group, a substituted or unsubstituted C ₆ -C ₆₀ aryloxy group, a substituted or unsubstituted C ₆ -C ₆₀ arylthio group, a substituted or unsubstituted C ₁ -C ₆₀ heteroaryl group, a substituted or unsubstituted monovalent non- Hyangjok condensed polycyclic group, a substituted or non-monovalent unsubstituted aromatic heterocyclic condensed polycyclic _{group, -N (Q 1) (Q} 2), -Si (Q 3) (Q 4) (Q 5), -B (Q ₆ ) (Q ₇ ) and -P (= O) (Q ₈ ) (Q ₉ )

c1 to c4 are independently selected from integers from 1 to 5,

a1 to a4 are independently of each other 0, 1, 2, 3, 4 or 5,

The plurality of R ₁ each other neighboring two or optionally, in combination with each other, a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group, or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic to form a cyclic group Can,

The plurality of R ₂ a neighboring two optionally, in combination with each other, a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group, or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic to form a cyclic group Can,

Two of a plurality of adjacent R < ₃ > groups may optionally be bonded to each other to form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group Can,

The plurality of R ₄ which are adjacent two or optionally, in combination with each other, a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group, or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic to form a cyclic group Can,

Two or more of the neighboring R ₁ to R ₄ may optionally be bonded to each other to form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group .

The C ₅ -C ₃₀ carbocyclic group, the C ₁ -C ₃₀ heterocyclic group and the CY ₁ to CY ₄ among the above-mentioned formulas 1-1 to 1-4 and 1A are independently of one another a) a 6-membered ring, b) 2 A condensed ring in which the above-mentioned 6-membered rings are condensed with each other, or c) a condensed ring in which one or more 6-membered rings and one 5-membered ring are condensed with each other, said 6-membered rings being selected from cyclohexane group, cyclohexene group, admantane, Wherein the 5-membered ring is selected from the group consisting of a cyclopentane group, a cyclopentene group, a cyclopentene group, a cyclopentane group, a cyclopentane group, a cyclopentane group, A thiophene group, a thiophene group, a silole group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isoxazole group, a thiazole group, an isothiazole group, A sol-group and a thiadiazole group. have.

The non-cyclic group of the above formulas 1-1 through 1-4 may be substituted with -C (= O) -, -OC (= O) -, *, * -OC (= S) - *, * -SC (= S) - *, and the like.

Substituents of the substituted C ₅ -C ₃₀ carbocyclic group in the above formulas 1-1 to 1-4 and 1A, substituents of the substituted C ₁ -C ₃₀ heterocyclic group, and R ₉₁ to R ₉₄ , R ₁ to R ₄ , R ₇ and R ₈ are, independently of each other,

A halogen atom, a hydroxyl group, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof ₂₀ alkoxy group, a phosphoric acid group or a salt thereof, -SF _5, C ₁ -C ₂₀ alkyl group and C ₁ -C;

Heavy hydrogen, -F, -Cl, -Br, -I , -CD 3, -CD 2 H, -CDH 2, -CF 3, -CF 2 H, -CFH 2, a hydroxyl group, a cyano group, a nitro group, An amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or its salt, a sulfonic acid group or its salt, a phosphoric acid group or its salt, a C ₁ -C ₁₀ alkyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, An adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a naphthyl group, a pyridinyl group and a pyrimidinyl group A C ₁ -C ₂₀ alkyl group and a C ₁ -C ₂₀ alkoxy group substituted with at least one;

A cyclopentyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, A phenyl group, a pyranyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, an imidazolyl group, a pyrazolyl group, A pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a pyridyl group, an isothiazolyl group, an isothiazolyl group, an isothiazolyl group, an isoxazolyl group, A quinolinyl group, a quinolizinyl group, a quinazolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazole group, a benzoquinolyl group, a benzoquinolinyl group, A benzooxazolyl group, a benzoxazolyl group, A thiazolyl group, a tetrazolyl group, an oxadiazole group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imide A jopyridinyl group and an imidazolopyrimidinyl group;

Heavy hydrogen, -F, -Cl, -Br, -I , -CD 3, -CD 2 H, -CDH 2, -CF 3, -CF 2 H, -CFH 2, a hydroxyl group, a cyano group, a nitro group, A carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C ₁ -C ₂₀ alkyl group, a C ₁ -C ₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cyclohexyl group, A cycloheptenyl group, a cyclohexyl group, a cycloheptenyl group, a phenyl group, a naphthyl group, a naphthyl group, a naphthyl group, A phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a crycenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, , Isothiazolyl group, oxazolyl group, isoxazolyl group, pyridinyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, isoindolyl group, , An indolyl group, an indolyl group, a pyridyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, A benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofurano group, (Q ₃₃ ) (Q ₃₄ ) (Q ₃₅ ), which is substituted with at least one group selected from the group consisting of a phenyl group, a dibenzosilyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group and -Si A cyclohexyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, a cycloheptenyl group, , A phenyl group, a naphthyl group, a fluorenyl group, A thiazolyl group, a thiazolyl group, an isothiazolyl group, an isothiazolyl group, an isothiazolyl group, a thiazolyl group, a thiazolyl group, a thiazolyl group, a thiazolyl group, An isoindolyl group, an indolyl group, an indazolyl group, a pyridyl group, a quinolinyl group, an isoquinolinyl group, a benzoyl group, an isoquinolinyl group, a benzoyl group, A benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, a benzoxazolyl group, a benzooxazolyl group, An oxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, A ridinyl group and an imidazopyrimidinyl group; And

_{-N (Q 1) (Q 2} ), -Si (Q 3) (Q 4) (Q 5), -B (Q 6) (Q 7) , and _{-P (= O) (Q 8} ) (Q 9 );

≪ / RTI >

Q ₁ to Q ₉ and Q ₃₃ to Q ₃₅ are, independently of each other,

-CH ₃ , -CD ₃ , -CD ₂ H, -CDH ₂ , -CH ₂ CH ₃ , -CH ₂ CD ₃ , -CH ₂ CD ₂ H, -CH ₂ CDH ₂ , -CHDCH ₃ , -CHDCD ₂ H _{, -CHDCDH 2, -CHDCD 3, -CD} 2 CD 3, -CD 2 CD 2 H , and -CD ₂ CDH _2;

n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, sec- Tilyl group; And

Deuterium, C ₁ -C ₁₀ alkyl group and the phenyl group selected from the at least one substituted, n- propyl group, isopropyl group, n- butyl group, isobutyl group, sec- butyl group, tert- butyl group, n- pentyl group, An isopentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group and a naphthyl group;

, But is not limited thereto.

According to another embodiment, the dopant is an organometallic compound represented by Formula 1A,

X ₂ and X ₃ are independently of each other C or N,

X < ₄ > is N,

i) M is Pt, ii) X ₁ is O, iii) X ₂ and X ₄ are N, X ₃ is C, and the bond between X ₂ and M and the bond between X ₄ and M is a coordination bond and, wherein the bond between X ₃ and M is a covalent bond, iv), and Y ₁ to Y ₅ is C, v) Y ₅ and the bond between the bond and Y ₃ and X ₅₁ of between X ₅₁ is a single bond, vi ) and CY _1, CY ₂ and CY ₃ is a benzene group, and CY ₄ a pyridine group, vii) X ₅₁ is O, S or N - and _{- [(L 7) b7 (} R 7) c7], viii) the b7 is 0, c7 is 1, and wherein R ₇ is substituted or unsubstituted C ₁ -C ₆₀ alkyl, if one, a1 to a4 are independently of one another, 1, 2, 3, 4 or 5, R ₁ to at least one of R ₄ are, independently of each other, substituted or unsubstituted C ₃ -C ₁₀ cycloalkyl group, a substituted or unsubstituted C ₁ -C ₁₀ heterocycloalkyl group, a substituted or unsubstituted C ₃ -C ₁₀ cycloalkenyl group, a substituted or unsubstituted C ₁ -C ₁₀ heterocycloalkyl alkenyl group, a substituted or non- A substituted or unsubstituted C ₆ -C ₆₀ aryl group, a substituted or unsubstituted C ₁ -C ₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic heterocyclic group Can be selected from among polycyclic groups.

According to another embodiment, the dopant may be represented by the formula:

In the above formula (1A-1)

M, X ₁ to X ₃ and X ₅₁ are each as described herein,

X ₁₁ is N or _{C - [(L 11) b11} - (R 11) c11] and, X ₁₂ is N or _{C - [(L 12) b12} - (R 12) c12] and, X ₁₃ is N or C - _{a, [(L 13) b13 -} (R 13) c13] and, X ₁₄ is N or _{C - - [(R 14)} c14 (L 14) b14]

L ₁₁ to L ₁₄ , b ₁₁ to b _{14 The} descriptions of R ₁₁ to R ₁₄ and c ₁₁ to c ₁₄ refer to the description of L ₁ , b ₁ , R ₁ and c _{1 in the} present specification,

X ₂₁ is N or _{C - [(L 21) b21} - (R 21) c21] and, X ₂₂ is N or _{C - [(L 22) b22} - (R 22) c22] and, X ₂₃ is N or C - [(L ₂₃ ) _b23 - (R ₂₃ ) _c23 ]

The description of L ₂₁ to L ₂₃ , b ₂₁ to b ₂₃ , R ₂₁ to R _23, and _{c 21} to _{c 23} will be described with reference to L ₂ , b ₂ , R ₂ and c _{2 in the} present specification,

X ₃₁ is N or _{C - [(L 31) b31} - (R 31) c31] and, X ₃₂ is N or _{C - [(L 32) b32} - (R 32) c32] and, X ₃₃ is N or C - _{a, - [(R 33) c33} (L 33) b33]

The description of L ₃₁ to L ₃₃ , b ₃₁ to b ₃₃ , R ₃₁ to R _33, and c ₃₁ to c ₃₃ will be described with reference to L ₃ , b ₃ , R ₃ and c _{3 in the} present specification,

X ₄₁ is N or _{C - [(L 41) b41} - (R 41) c41] and, X ₄₂ is N or _{C - [(L 42) b42} - (R 42) c42] and, X ₄₃ is N or C _{- [(L 43) b43 -} (R 43) c43] , and X ₄₄ is N or _{C - [(L 44) b44} - (R 44) c44] , and

The description of L ₄₁ to L ₄₄ , b ₄₁ to b ₄₄ , R ₄₁ to R _44, and c ₄₁ to c ₄₄ refer to the description of L ₄ , b ₄ , R ₄ and c _{4 in the} present specification,

Two of R ₁₁ to R ₁₄ are optionally bonded to each other to form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group You can,

Two of R ₂₁ to R ₂₃ are optionally, in combination with each other, may form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group, or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group, and ,

Two of R ₃₁ to R ₃₃ may optionally be bonded to each other to form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group ,

Two of R ₄₁ to R ₄₄ may optionally be bonded together to form a substituted or unsubstituted C ₅ -C ₃₀ carbocyclic group or a substituted or unsubstituted C ₁ -C ₃₀ heterocyclic group have.

For example, the dopant may be but is not limited to one of the following compounds 1-1 to 1-88, 2-1 to 2-47, and 3-1 to 3-582:

In the above, the case where the light emitting layer of the green light emitting unit (green organic light emitting element) 30 includes the phosphorescent light emitting material has been mainly described, but the present invention is not limited thereto. The light emitting layer of the green light emitting unit (green organic light emitting element) 30 may include a thermally activated delayed fluorescence (TADF) dopant. The TADF dopant may be a thermally assisted delayed fluorescence dopant. In this case, highly efficient delayed fluorescence emission may be possible.

The light emitting layer of the green light emitting unit (green organic light emitting element) 30 may include the phosphorescent light emitting material described above, but the present invention is not limited thereto. The light emitting layer may include a phosphorescent material other than the phosphorescent material described above. Further, the light emitting layer of the green light emitting unit 30 may include a forming photoluminescent material. All green phosphors used in conventional OLEDs can be applied as the green light emitting layer material of the present invention. A fluorescent luminescent material for emitting green light is well known, and a detailed description thereof is excluded.

On the other hand, in the embodiment, the light emitting layer of the blue light emitting units 20 and 40 may include a fluorescent light emitting material and / or a phosphorescent light emitting material for emitting blue light. All blue fluorescent / phosphorescent materials used in conventional OLEDs can be applied as the blue light emitting layer material of the present invention. Fluorescent luminescent materials and phosphorescent luminescent materials for emitting blue light are well known, and a detailed description thereof is excluded.

12 is a graph showing photoluminescence (PL) quantum yield (%) according to wavelengths of a green-QD-containing color conversion element and a red-QD-containing color conversion element applicable to a display device according to an embodiment.

Referring to FIG. 12, it can be seen that the green-QD-containing color conversion element exhibits a PLL quantum yield up to a substantially green wavelength range, and the Red-QD-containing color conversion element exhibits a PLL quantum yield to a substantially red wavelength range. The Green-QD-containing color conversion element and the Red-QD-containing color conversion element may be respectively applied to the first color adjustment element 70a and the second color adjustment element 70b of FIG.

13 is a graph showing a change in transmittance (%) according to wavelengths of the green-QD-containing color conversion element and the red-QD-containing color conversion element applicable to the display device according to the embodiment.

Referring to FIG. 13, it can be seen that the green-QD-containing color conversion element exhibits a high transmittance from the wavelength corresponding to the green region and the red-QD-containing color conversion element exhibits a high transmittance from the wavelength corresponding to the red region have.

14 is a graph showing an emission spectrum of an OLED substrate (light source) applicable to a display device according to the embodiment. Here, the OLED substrate (light source) corresponds to the OLED substrate 100 of FIG. 1 or the OLED substrate 101 of FIG. 9, and is configured to generate light mixed with blue light and green light.

Referring to FIG. 14, it can be seen that the OLED substrate (light source) according to the embodiment mainly generates light in the blue wavelength region and the green wavelength region, and generates light corresponding to the middle region between blue and green.

15 is a graph showing an emission spectrum after light generated from an OLED substrate (light source) passes through a green-QD-containing color conversion element according to an embodiment. As shown in FIG. 15, after the light generated from the OLED substrate (light source) passes through the green-QD-containing color conversion element, the light in the green wavelength region is intensified. A part of the light in the blue wavelength region may remain, but the residual blue light can be blocked by the first color filter 80a in Fig.

16 is a graph showing an emission spectrum after light generated in an OLED substrate (light source) passes through a red-QD-containing color conversion element according to an embodiment. As shown in FIG. 16, after the light generated from the OLED substrate (light source) passes through the red-QD-containing color conversion element, the light in the red wavelength region is strengthened. A part of the light in the blue wavelength region and the green wavelength region may remain, but the residual blue light and the green light can be blocked by the second color filter 80b in Fig.

17 is a graph showing a change in transmittance (%) according to wavelength of an absorption type color filter applicable to a display device according to an embodiment. The results for each of the absorbing red-color filter, the absorbing green-color filter and the absorbing blue-color filter are included. The absorption type Green-color filter, the absorption type Red-color filter and the absorption type Blue-color filter are, for example, the first color filter 75a, the second color filter 75b and the third color filter 75b Color adjustment element) 75c, respectively.

18 is a graph showing a change in transmittance (%) according to the wavelength of a cut-off type color filter applicable to the display device according to the embodiment. Cutoff type Red-color filters, cut-off type Green-color filters, and cut-off type Blue-color filters, respectively. The cut-off type Green-color filter, the cut-off type Red-color filter and the cut-off type Blue-color filter are, for example, a first color filter 80a, a second color filter 80b and a third color filter 80c, Respectively.

FIG. 19 is a graph showing a change in transmittance (%) according to wavelength of an absorption type color filter applicable to a display device according to an embodiment. The results for the absorption red-color filter (CF-Red), absorption green-color filter (CF-Green) and absorption blue-color filter (CF-Blue) are included. Also included are results for absorbing low-reflection red-color filters (low reflectance R), absorbing low reflectance green-color filters (low reflectance G), and absorbing low reflectance blue-color filters (low reflectance B) . In the absorptive low reflection red-color filter, 'low reflectance' means that the reflectance is relatively smaller than that of the absorptive red-color filter. This is also the case for low reflection green-color filters and low reflection blue-color filters. By controlling the configuration of the color filter, the reflectance and transmittance thereof can be appropriately adjusted. The absorptive low reflection green color filter, the absorptive low reflectance Red-color filter, and the absorptive low-reflectance blue-color filter described above also correspond to the first color filter 75a, the second color filter 75b, And a color filter (third color adjusting element) 75c. The use of an absorptive low-reflection color filter can reduce the reflectivity on the panel, thereby increasing the contrast ratio without a circular polarizer.

20 is a graph showing the difference between spectral radiance when a light scattering agent is applied to blue light and when spectral radiance is not applied to blue light.

Referring to FIG. 20, when no light scattering agent is applied (before scattering agent), light is not well dispersed and a large number of peaks are generated. When a light scattering agent is applied (after scattering agent), it can be seen that one peak having a relatively smooth curve appears because light is well dispersed.

21 is a graph showing a change in current efficiency (cd / A) according to various conditions constituting the display device.

Referring to FIG. 21, the final condition among various conditions of the X-axis is a condition of "B / G / B_QD CF" corresponding to the present embodiment. This is the case where a plurality of color filters (color control elements) composed of quantum dots are used while using an OLED light source of a B / G / B tandem structure. "B / B / B_QD CF" and "B / B_QD CF" are used when a white OLED light source is used, and "B / Y / B_QD CF" and "B / RY / B_QD CF" Is used.

It can be seen from the result of FIG. 21 that the highest current efficiency can be obtained when the display device is configured with the condition of "B / G / B_QD CF" corresponding to the embodiment of the present invention. In case of "B / G / B_QD CF" condition, the current efficiency was more than 11 cd / A, and in case of "B / B / B_QD CF" condition, current efficiency was about 10 cd / A. The difference in efficiency between these can be more than 10%. In particular, in the case of the condition "B / B_QD CF", the current efficiency of the condition "B / G / B_QD CF" is about 1.5 times larger than the current efficiency of about 7.5 cd / . Therefore, when the display device is configured under the conditions according to the embodiment, high current efficiency can be obtained.

22 is a graph showing a change in color characteristics (%) according to various conditions constituting the display device. The conditions corresponding to the X-axis in FIG. 22 may be the same as or similar to those described with reference to FIG. FIG. 22 includes values measured based on DCI_Gamut and values measured based on DCI_Coverage.

B / B / B_QD CF ", " B / B / B_QD CF ", and "B / R / B_QD CF " / B_QD CF "condition, the higher value of the color characteristics was obtained under the condition of" B / G / B_QD CF "according to the embodiment. Also in the case of the DCI_Gamut reference color characteristic (%), the highest color characteristic value was obtained under the condition of "B / G / B_QD CF" according to the embodiment. Therefore, when the display device is configured under the conditions according to the embodiment, excellent color characteristics and color reproduction ratio can be obtained.

The display device according to the embodiments described above can be applied to various electronic devices. For example, it can be usefully applied to small-sized electronic apparatuses such as portable apparatuses and wearable apparatuses and medium- and large-sized electronic apparatuses such as home appliances.

While a great many have been described above, they should be construed as illustrative of specific embodiments rather than as a limitation of scope. For example, the OLED substrate, the color control unit, and the display device including the OLED substrate, the color control unit, and the connection structure between the OLED substrate, the color control unit, and the display unit including the OLED substrate, . Therefore, the scope of the right should not be determined by the embodiment described but should be determined by the technical idea described in the claims.

Description of the Related Art [0002]
1: TFT array substrate 10, 10a to 10c: first electrode
20, 20a: first blue light emitting unit 25: first charge generating layer
30, 30a: green light emitting unit 35: second charge generating layer
40, 40a: second blue light emitting unit 50: second electrode
60: protective layer 65: selective reflective film
70a: first color adjusting element 70b: second color adjusting element
70c: third color adjusting element 71c: first light scattering element
71d: second light scattering element 75a: first color filter
75b: second color filter 75c: third color adjusting element
80a: first color filter 80b: second color filter
80c: third color filter 100, 100a, 101: OLED substrate
200 to 203a:

Claims (23)

An OLED (organic light emitting device) substrate including a structure in which at least one blue light emitting unit and at least one green light emitting unit are stacked, and generates light mixed with blue light and green light; And
And a color control unit provided on the OLED substrate for controlling a color of light emitted from the OLED substrate, wherein the color control unit includes a first color control element including a first quantum dot for green conversion, A third color adjustment element for blue color development, a first color filter on the first color adjustment element, and a second color adjustment element on the second color adjustment element, 2 color filter. The method according to claim 1,
Wherein the OLED substrate has a tandem structure. The method according to claim 1,
Wherein the OLED substrate includes a first blue light emitting unit, a green light emitting unit and a second blue light emitting unit which are sequentially stacked,
And the green light emitting unit is disposed between the first and second blue light emitting units. The method of claim 3,
A first charge generation layer provided between the first blue light emitting unit and the green light emitting unit; And
And a second charge generation layer provided between the green light emitting unit and the second blue light emitting unit. The method according to claim 1,
Wherein the green light emitting unit includes an organic material-based green light emitting layer,
Wherein the green light emitting layer comprises a thermally activated delayed fluorescence (TADF) dopant. The method according to claim 1,
Wherein the green light emitting unit includes an organic material-based green light emitting layer,
Wherein the green light emitting layer comprises a phosphorescent dopant,
Wherein the dopant satisfies a relation T1 (dopant) S1 (dopant) T1 (dopant) + 0.5 eV wherein T1 (dopant) is a triplet energy level (eV) of the dopant, (EV) < / RTI > of the dopant. The method according to claim 6,
Wherein the dopant is an organometallic compound including iridium (Ir). The method according to claim 6,
The dopant may be at least one selected from the group consisting of Pt, Os, Ti, Zr, Hf, Eu, Terbium, Tm, Rh, Ru, rhenium, beryllium, magnesium, aluminum, calcium, manganese, cobalt, copper, zinc, gallium Ga, Ga, Rh, Pd, Ag, or Au. The method according to claim 6,
Wherein the dopant is an organometallic compound having a square-planar coordination structure. The method according to claim 6,
Wherein the dopant comprises a metal M and an organic ligand, wherein the metal M and the organic ligand form one, two, or three cyclometallated rings. The method according to claim 6,
Wherein the dopant comprises a metal M and a quadrivalent organic ligand capable of forming three or four cyclometallated rings,
M is at least one element selected from the group consisting of Pt, Os, Ti, Zr, Hf, Eu, Terbium, Tm, Rh, Ru, rhenium, beryllium, magnesium, aluminum, calcium, manganese, cobalt, copper, zinc, gallium (Ga), germanium (Ge), rhodium (Rh), palladium (Pd), silver (Ag)
Wherein the quadrivalent organic ligand comprises a benzimidazole group or a pyridine group. The method according to claim 1,
Wherein the first color filter is a blue cut filter,
And the second color filter is a blue and green cut filter. The method according to claim 1,
Wherein the first color filter is an absorption type green color filter,
And the second color filter is an absorption type red color filter. The method according to claim 1,
Wherein the third color adjustment element comprises a blue color filter,
And a light scattering element provided between the blue color filter and the OLED substrate. The method according to claim 1,
Wherein the third color adjustment element comprises a color conversion element having a third quantum dot for blue conversion,
And a third color filter provided on the third color adjusting element. 16. The method of claim 15,
Wherein the third color filter is a green cut filter or an absorbing blue color filter. The method according to claim 1,
Wherein the core portion of the second quantum dot has a larger size than the core portion of the first quantum dot. The method according to claim 1,
Wherein the first color adjustment element corresponds to a first subpixel region, the second color adjustment element corresponds to a second subpixel region, the third color adjustment element corresponds to a third subpixel region,
Wherein the display device further comprises three sub-pixel regions, and the fourth sub-pixel region is configured to emit a color different from the first through third sub-pixel regions. 19. The method of claim 18,
Wherein the four sub-pixel regions are blank regions without color control elements on the OLED substrate, or include light scattering elements provided on the OLED substrate. The method according to claim 1,
And a selective reflection film provided between the OLED substrate and the color control unit. 21. The method of claim 20,
Wherein the selective reflection film is configured to transmit blue light and green light and reflect red light. The method according to claim 1,
Further comprising a TFT array substrate having a plurality of thin film transistors (TFT) for driving pixel regions of the OLED substrate. An electronic device comprising the display device according to any one of claims 1 to 22.

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