CN119563397A - Organic electroluminescent device including a light extraction layer - Google Patents
Organic electroluminescent device including a light extraction layer Download PDFInfo
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- CN119563397A CN119563397A CN202380046643.7A CN202380046643A CN119563397A CN 119563397 A CN119563397 A CN 119563397A CN 202380046643 A CN202380046643 A CN 202380046643A CN 119563397 A CN119563397 A CN 119563397A
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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Abstract
本发明揭示了包括光萃取层的有机电致发光器件。揭示可以由有机电致发光器件组成，其中，包括光萃取层的有机电致发光器件依次具备基板、第一电极、包括蓝色发光层的一个以上有机层、第二电极、光萃取层，且所述光萃取层包括满足以下条件(1)至条件(3)的材料。其中，条件(1)n(@450nm)≥2.00，条件(2)k@420nm≥0.10，条件(3)k@450nm≤0.01，其中，该n表示界定波长中的折射率，该k表示界定波长中的吸光系数。据此，有机电致发光器件可以提高光萃取层的外部发光效率及颜色纯度。
The present invention discloses an organic electroluminescent device including a light extraction layer. The disclosure discloses that the device can be composed of an organic electroluminescent device, wherein the organic electroluminescent device including the light extraction layer sequentially comprises a substrate, a first electrode, one or more organic layers including a blue light-emitting layer, a second electrode, and a light extraction layer, and the light extraction layer comprises a material satisfying the following conditions (1) to (3). Among them, condition (1) n(@450nm) ≥ 2.00, condition (2) k@420nm ≥ 0.10, condition (3) k@450nm ≤ 0.01, wherein n represents the refractive index in the defined wavelength, and k represents the absorption coefficient in the defined wavelength. Accordingly, the organic electroluminescent device can improve the external luminous efficiency and color purity of the light extraction layer.
Description
Technical Field
The present invention relates to an organic electroluminescent device, and more particularly, to an organic electroluminescent device including a light extraction layer.
Background
The light emitting efficiency of the organic electroluminescent device is divided into an internal light emitting efficiency, which is an internal light emission that appears by an organic layer brought between a first electrode and a second electrode through an optical process, and an external light emitting efficiency, which is an external emission to an extent of about 20%, which is about 80% disappeared in the optical process.
As described above, in the light extraction layer, in order to prevent the disappearance of light during the optical process and to improve the external light emission efficiency, various organic compounds having a high refractive index have been used as the light extraction layer material, and so far, efforts have been made to develop organic compounds having a high refractive index and being stable, which can improve the external light emission efficiency, even for the external light emitting material. However, the organic electroluminescent device emits blue light in a light emission wavelength region around 440nm to 510nm, and thus, in the light extraction layer having a high refractive index, part of light in the 440nm to 450nm region is absorbed, which may result in a decrease in efficiency and a decrease in color purity.
Also, UV light existing in nature or UV light occurring during a thin film encapsulation process (TFE: thin Film Encapsulation) causes denaturation of a light emitting layer and a functional layer.
In order to increase the light extraction ability, development of organic compounds having a high refractive index has been continued while also striving to develop organic compounds having stability to UV light, which is a factor that causes a reduction in the lifetime of the device during its manufacture and use.
[ Prior Art literature ]
[ Patent literature ]
Korean laid-open patent No. 10-2004-0098238
Disclosure of Invention
Problems to be solved by the invention
The aim of the invention is to make the RGB image display device better reach the service life of the instrument.
In general, in order to enhance light extraction, a high refractive light extraction layer is laminated. Patent document 1 discloses that the light-emitting efficiency of a red light-emitting device and a green light-emitting device is improved by about 1.5 times by forming a film on an upper electrode of an organic EL device using an organic light extraction layer having a refractive index of 1.7 or more and a film thickness of 60 nm.
The purpose is that the luminous wavelength of the luminous layer of the RGB image display device belongs to the absorption band region of the light extraction layer in terms of improving the service life, so that the light absorption efficiency is not reduced, the service life of the instrument is prevented from being shortened by the UV light existing in natural light, and the service life of the instrument is prolonged by absorbing the UV light source possibly occurring in the manufacturing process of the instrument.
However, the object of the present invention is not limited to the above, and of course, the object or effect that can be understood by the solution or the embodiment is included even if not explicitly mentioned.
Means for solving the problems
In order to achieve the above object, the present invention is composed of an organic electroluminescent device comprising, in order, a substrate, a first electrode, one or more organic layers including a blue light emitting layer, a second electrode, and a light extraction layer, wherein the light extraction layer includes a material satisfying the following conditions (1) to (3).
Wherein, the condition (1) n (@ 450 nm) is more than or equal to 2.00,
The condition (2) that k@420nm is more than or equal to 0.10,
The condition (3) that k@450nm is less than or equal to 0.01,
At this time, n represents the refractive index in the defined wavelength, and k represents the light absorption coefficient in the defined wavelength.
May consist of an organic electroluminescent device consisting of said second electrode comprising a metal.
May be composed of an organic electroluminescent device, wherein the light extraction layer has a film thickness of 200nm or less.
The organic electroluminescent device comprises a blue light-emitting layer, wherein the PL spectrum peak wavelength of the light-emitting material contained in the blue light-emitting layer is more than 430nm and less than 500 nm.
May be composed of an organic electroluminescent device, wherein the organic layer further includes a red light emitting layer and a green light emitting layer.
Can be composed of a light extraction layer for an organic electroluminescent device having a refractive index of 2.20 or more in the wavelength of 450nm of the condition (1).
Effects of the invention
The organic electroluminescent device of the present invention comprises a light extraction layer containing a compound for a light extraction layer having a refractive index (n) of 2.0 or more at a wavelength of 450nm, thereby obtaining high efficiency.
Specifically, the light extraction layer is formed, so that high efficiency is obtained in Blue devices, green devices and Red devices.
In addition, the organic light emitting device of the present invention forms the light extraction layer using the light extraction layer compound having an absorbance coefficient (k) of 0.1 or more in 420nm and an absorbance coefficient (k) of 0.01 or less in 450nm, thus blocking efficiency reduction and possibility of color change due to absorption in the visible light region, absorbing UV light which may be exposed during the manufacturing process and use of the device, which helps the device composed of the organic electroluminescent device maintain a long lifetime.
Hereinafter, the above-described effects and additional effects will be described in detail.
Meanwhile, various advantageous advantages and effects of the present invention are not limited to the above, which can be more easily understood in describing the embodiments of the present invention.
Drawings
Fig. 1 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment of the present invention.
Fig. 2 shows a graph of the spectrum of blue wavelengths occurring in an organic electroluminescent device and the absorbance coefficients in the range of 380nm to 530nm for various different comparative compounds.
Description of the reference numerals
100 Substrate
110 First electrode
200 Organic layer
210 Hole injection layer
215 Charge generation layer
220 Luminous layer
230 Electron transport layer
235 Electron injection layer
120 Second electrode
300 Light extraction layer
Detailed Description
While the invention is susceptible to various modifications, alternative forms, and specific embodiments thereof have been shown by way of example in the drawings and will herein be described in detail.
However, it is not intended to limit the disclosed form of the invention, and unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.
Hereinafter, the present invention is described in further detail.
The light extraction layer for the organic electroluminescent device provided by the embodiment of the invention can meet the following conditions.
Condition (1) n (@ 450 nm) is not less than 2.00
Condition (2) k@420nm is not less than 0.10
Condition (3) k@450 nm.ltoreq.0.01
At this time, the n represents the refractive index in the defined wavelength.
The k represents the absorption coefficient in the defined wavelength.
The organic electroluminescent device of the present invention has a refractive index of 2.25 or more at a wavelength of 450nm, an absorbance of 0.10 or more at 420nm, and a light extraction layer comprising a compound for a light extraction layer having an absorbance of 0.01 or less at 450nm, and thus can achieve high efficiency and long life.
Specifically, the light extraction layer for the organic electroluminescent device adopts the high refractive index light extraction material with the refractive index of more than 2.0 in the wavelength of 450nm in the condition (1), and can effectively absorb high energy in an instrument process and a UV region in use when the light extraction material has an absorbance coefficient of more than 0.10 in 420nm, so that the damage to organic matters in the organic electroluminescent device is reduced to the minimum, and the service life of the organic electroluminescent device is prolonged.
When the light absorption coefficient is 0.01 or less at 450nm, the light emitted from the organic electroluminescent device is not absorbed, which contributes to improvement of efficiency and color purity.
Hereinafter, the organic electroluminescent device according to the present invention is described in further detail.
Fig. 1 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment of the present invention. As shown in fig. 1, the organic light emitting device according to an embodiment may include a first electrode 110, a hole injection layer 210, a charge generation layer 215, a light emitting layer 220, an electron transport layer 230, an electron injection layer 235, a second electrode 120, and a light extraction layer 300 sequentially stacked on a substrate 100.
The first electrode 110 and the second electrode 120 are disposed opposite to each other, and the organic layer 200 may be disposed between the first electrode 110 and the second electrode 120. The organic layer 200 may include a hole injection layer 210, a charge generation layer 215, a light emitting layer 220, an electron transport layer 230, and an electron injection layer 235.
In the light extraction layer 300 according to the present invention, the light extraction layer may be disposed outside one or more of the first electrode and the second electrode.
Specifically, of the two side surfaces of the first electrode or the second electrode, the side adjacent to the organic layer interposed between the first electrode and the second electrode is referred to as an inner side, and the side not adjacent to the organic layer is referred to as an outer side. That is, when the light extraction layer is disposed outside the first electrode, the first electrode is sandwiched between the light extraction layer and the organic layer, and when the light extraction layer is disposed outside the second electrode, the second electrode is sandwiched between the light extraction layer and the organic layer.
In the organic light emitting device according to an embodiment of the present invention, 1 or more organic layers may be interposed between the inner sides of the first electrode and the second electrode, and a light extraction layer may be formed on the outer side of any one or more of the first electrode and the second electrode. That is, the light extraction layer may be formed on both the outer side of the first electrode and the outer side of the second electrode, or only the outer side of the first electrode or the outer side of the second electrode.
In this case, the refractive index of the light extraction layer may be 2.0 or more, specifically, 2.2 or more at a wavelength of 450nm, 0.10 or more at 420nm, and 0.01 or less at 450 nm.
As shown in fig. 1, in the organic light emitting device according to an embodiment, the first electrode 110 has conductivity. The first electrode 110 may be formed of a metal alloy or a conductive compound. The first electrode 110 is typically an anode (anode), but the function as an electrode is not limited.
The first electrode 110 is formed using an electrode material on the upper portion of the substrate 100 by a deposition method, an electron beam evaporation method, a sputtering method, or the like. In order to easily inject holes into the organic light emitting device, the material of the first electrode 110 may be selected from substances having a high work function.
The light extraction layer 300 proposed by the present invention is only suitable for the case where the light emitting direction of the organic light emitting device is top emission, and thus, the first electrode 110 adopts a reflective electrode. Which can be made of metal materials. Such as the non-oxides Mg (magnesium), al (aluminum), al-Li (aluminum-lithium), ca (calcium), mg-In (magnesium-indium), mg-Ag (magnesium-silver). Recently, a carbon substrate flexible electrode material such as CNT (carbon nanotube), graphene, or the like may be employed.
The organic layer 200 may be formed of a plurality of layers. When the organic layer 200 is a plurality of layers, the organic layer 200 may include hole transport regions 210 to 215 disposed on the first electrode 110, a light emitting layer 220 disposed on the hole transport regions, and electron transport regions 230 to 235 disposed on the light emitting layer 220.
Meanwhile, the hole injection layer 210 may be formed on the upper portion of the first electrode 110 by deposition using a hole injection layer material by a vacuum deposition method, a spin coating method, a casting method, a Langmuir-Blodgett (LB) method, or the like. When the hole injection layer 210 is formed by the vacuum deposition method, the deposition conditions thereof are different depending on the compound used as the material of the hole injection layer 210, the structure and thermal characteristics of the target hole injection layer 210, and the like, but are generally appropriately selected in the range of 50-500 ℃ deposition temperature, 10-8 to 10-3torr vacuum degree, 0.01 to 100/sec deposition rate, 10 to 5 μm layer thickness. In addition, the surface of the hole injection layer 210 further deposits a charge generation layer 215 as needed. The charge generation layer material may be a conventional material, for example, HATCN.
At the same time, the light emitting layer 220 is formed by depositing a light emitting layer material on top of the hole transporting layer 210 or the charge generating layer 215 by a vacuum deposition method, a spin coating method, a casting method, an LB method, or the like. When the light-emitting layer 220 is formed by the vacuum deposition method, the deposition conditions are selected depending on the compound used, and in general, it is preferable to select the conditions in a range almost equivalent to the formation of the hole injection layer 210.
The light-emitting layer material may use a known compound as a substrate or dopant.
In the case where phosphorescent dopants are used together in the light emitting layer material, a hole-inhibiting material (HBL) may be further deposited on the light emitting layer 220 by a vacuum deposition method or a spin coating method in order to prevent the triplet excitons or holes from diffusing into the electron transport layer 230. The hole-suppressing material that can be used is not particularly limited, and any known material can be used. For example, a typical example of the hole-suppressing material described in JP-A11-329734 (A1) and an oxadiazole derivative, a triazole derivative, a phenanthroline derivative, and a phenanthroline (phenanthrolines) compound (for example, UDC BCP (Bathocuproine)) may be used, and the light-emitting layer 220 of the present invention may include one or more blue light-emitting layers.
Also, the electron transport layer 230 is formed on the upper portion of the light emitting layer 220, and may be formed by vacuum deposition, spin coating, casting, or the like. The deposition conditions of the electron transport layer 230 may vary depending on the compound used, but in general, it is preferable to select a range of conditions almost equivalent to those for the formation of the hole injection layer 210.
Further, an electron injection layer material may be deposited on the upper portion of the electron transport layer 230 to form the electron injection layer 235, which may be formed by a vacuum deposition method, a spin coating method, a casting method, or the like.
Meanwhile, the second electrode 120 serves as an electron injection electrode, which may be formed on the upper portion of the electron injection layer 235 by a vacuum deposition method, a sputtering method, or the like. A variety of metals may be used as the material of the second electrode 120. Specific examples include, but are not limited to, aluminum, gold, silver, magnesium, and the like.
The organic light emitting device according to the present invention may be an organic electroluminescent device including the above-described structure of the light extraction layer 300, the first electrode 100, the hole injection layer 210, the charge generation layer 215, the light emitting layer 220, the electron transport layer 230, the electron injection layer 235, the second electrode 120, and the light extraction layer 300, or may be an organic electroluminescent device further provided with one or two intermediate layers as needed.
In addition, the thickness of each organic layer formed according to the present invention may be adjusted according to a desired degree, and specifically may be 1 to 1,000nm, and more specifically may be 1 to 150nm. The light extraction layer 300 may be formed in both sides of the first electrode 110, without forming an outer side of the hole injection layer 210. The electron injection layer 235 may be formed on both side surfaces of the second electrode 120, but is not limited to this. The light extraction layer 300 may be formed by a deposition process, and the thickness of the light extraction layer 300 may be 100 to 2,000, more particularly, 300 to 1,000. In this manner, the transmittance of the light extraction layer 300 can be prevented from being reduced by the thickness adjustment.
Also, although not shown in fig. 1, according to an embodiment of the present invention, an organic layer having various functions may be further formed between the light extraction layer 300 and the first electrode 110 or between the light extraction layer 300 and the second electrode 120. Alternatively, the upper portion (outer surface) of the light extraction layer 300 may be further formed with an organic layer having various functions, which is not limited thereto.
In the organic light emitting device, as voltages are applied to the first electrode 110 and the second electrode 120, holes (holes) injected from the first electrode 110 migrate to the light emitting layer 220 through the hole transport regions 210 to 215, and electrons injected from the second electrode 120 migrate to the light emitting layer 220 through the electron transport regions 230 to 235. The electrons and holes recombine in the light-emitting layer 220 to generate excitons (exciton), which drop to the ground state in the excited state and emit light.
The light path generated by the light emitting layer 220 may show a very different tendency according to the refractive index of the organic/inorganic substance constituting the organic light emitting device. Of the light passing through the second electrode 120, only light transmitted at an angle smaller than the critical angle of the second electrode 120 may pass through. In addition, light contacting the second electrode 120 at more than a critical angle is totally reflected or reflected, and cannot be radiated to the outside of the organic light emitting device.
When the refractive index of the light extraction layer 300 is high, such total reflection or reflection phenomenon is reduced, contributing to the improvement of luminous efficiency, and when having an appropriate thickness, a Micro-cavity (Micro-cavity) phenomenon is maximized, which contributes to the substantial improvement of efficiency and the improvement of color purity.
The light extraction layer 300 is located at the outermost side of the organic light emitting device, and has no influence on the driving of the device and also has a great influence on the characteristics of the device. Therefore, the light extraction layer 300 plays a role in protecting the inside of the organic light emitting device and also improving the device characteristics, both of which are important. The organic matter absorbs light energy in a specific wavelength region, which depends on the energy bandgap. The adjustment of the energy band gap for absorbing the UV region, including the improvement of the optical characteristics of the light extraction layer 300, can be used for the protection of the organic light emitting device, and the UV region can have an influence on the organic substances in the organic light emitting device.
The organic light emitting device of the present invention may be of a top emission type, a back emission type or a two-sided emission type depending on the materials used.
Hereinafter, in order to specifically describe the present specification, detailed description will be made by taking examples. However, the embodiments described in the present specification may be modified into various other forms, and the scope of the present application should not be construed as being limited to the embodiments described in detail below. Embodiments of the present application are provided to more fully describe the present specification for those of ordinary skill in the art.
Test example 1 ]
Method for detecting refractive index and light absorption coefficient
The refractive index (n) and the absorbance (k) of the prepared compound for the light extraction layer were measured by an ellipsumeter instrument from j.a. wolam, inc.
Preparation of test piece:
To examine the optical characteristics of the compounds, silicon substrates were washed with Ethanol (Ethanol), deionized Water (DI Water), acetone (Acetone), and Ultrasonic waves (Ultrasonic) for 20 minutes, respectively, and then the compounds were placed on the washed silicon substrates, and then deposited films having a thickness of 50nm were formed at a speed of 1/sec in a vacuum of 2.0x10-7Torr, to prepare test pieces.
And detecting the refractive index and the light absorption coefficient of the prepared test piece in the wavelength range of 380-530 nm by using the ellipsometer device.
< Test example 2>
Preparation of organic electroluminescent device
Table 1 shows the structure of a conventional organic light emitting device, and the organic light emitting device of the present invention is schematically prepared by stacking a first electrode 110/a hole injection layer 210/a charge generation layer 215/a light emitting layer 220/an electron transport layer 230/an electron injection layer 235/a second electrode 120/a light extraction layer 300 in this order from below.
The hole injection layer 210, the charge generation layer 215, the light emitting layer 220, the electron transport layer 230, and the electron injection layer 235 are all as shown in table 1 below.
The electron injection layer 235 has the second electrode 120 formed thereon for injecting electrons. A variety of metals may be used as the cathode.
And, the light extraction layer 300 is formed on the second electrode 120.
[ Table 1]
Table 2 below describes structural formulas of materials used for the light extraction layer in comparative example 1 and examples 1 to 4.
[ Table 2]
Comparative example 1]
A glass substrate is provided, a reflective layer containing Ag is formed on an upper portion of the substrate to serve as a reflective film of a first electrode, and ITO is deposited on an upper portion of the reflective film formed using the Ag. Then, on top of the ITO, a layer was formed with HIL-1 100nm as an organic film layer, a mixture of HIL-1 and HIL-2 (9:1, wt./wt.) was used as a charge generation layer, and then a layer was formed with 10nmfmf as a charge generation layer, and then a layer was formed with 2 wt% of coating dopant BD01 as a light-emitting layer, on the substrate BH01, at 25 nm. On the electron transport layer, a mixture of ET01 and Liq (1:1, wt./wt.) was formed to a thickness of 30nm, and then LiF was deposited at 1nm to form an electron injection layer. Next, mgAg was deposited at a thickness of 15nm as a second electrode, on which Alq3 shown in fig. 2 was used, and deposited at 60nm to be used as a light extraction layer. The thus-prepared device was encapsulated (Encapsulation) in a glove box to prepare an organic electroluminescent device.
< Example 1> to < example 4>
The same procedure as in comparative example 1 was used to prepare organic electroluminescent devices using light extraction layers to form films using the k-Test1, k-Test2, k-Test3, and k-Test4 compounds shown in Table 2.
< Test example 3>
Performance evaluation of organic electroluminescent device
In the evaluation of efficiency and color coordinates, voltage is applied through a Ji Liu 2400source measurement unit (Kiethley 2400, 2400source measurement unit), electrons and holes are injected, and the brightness and color coordinates during light emission are detected by a Kenicamantadine spectroradiometer (Konica Minolta CS-2000).
The same equipment as that used in the life test was used to test the change in brightness at 10mA/cm2, and the life was evaluated in a state where the test piece in the test chamber was uniformly irradiated with the LED light source in order to reproduce the daily use condition (LightingRoom) (the test was performed in a dark room after the light was turned off during the test).
In order to evaluate the life arrangement camera (Darkroom) of the material itself, and evaluate the life, the life change under the daily use condition and the life change under the life evaluation condition of the material itself are detected and compared, and the results thereof are also recorded in table 3.
[ Table 3]
Fig. 2 shows the light absorption coefficients of the respective materials at different wavelengths and the light emission spectra at different wavelengths according to the results of test examples 1 and 3.
As shown in fig. 2, it is known from the absorption coefficients of various light extraction materials at different wavelengths that light generated by the light emitting layer (EML) can be absorbed, and UV generated in nature or in the fabrication of an organic electroluminescent device can be absorbed.
From the results of comparative example 1 and examples 1 to 4, it was confirmed that the efficiency can be significantly improved when the material satisfying the condition (1) described in claim 1 is used for the light extraction layer.
It was also confirmed that, in the darkroom (Darkroom), the lifetime of all materials is different, but when the material satisfying the condition (2) is used as the light extraction layer, the lifetime (Life) of the darkroom (Lightingroom) can be increased.
The material exceeding condition (3) can improve efficiency due to high refraction, but cie_y increases sharply and BI decreases, so that it is known that it can partially absorb light generated in the light extraction layer itself at the light emitting layer.
From the above, it is confirmed that the higher the refractive index of the light extraction layer, the higher the efficiency, and the material with the absorbance coefficient of k@420nm being equal to or greater than 0.10 can actually improve the service life when the instrument is actually used in natural environment. The material with the light absorption coefficient of k@450nm less than or equal to 0.01 inevitably absorbs the ground light generated by the light-emitting layer, thereby realizing the organic electroluminescent device with high efficiency, long service life and high color purity.
The invention has been shown and described above with the preferred embodiments illustrating the principles of the invention, but the invention is not limited to the constructions and functions shown and described above. And it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the following claims. Accordingly, all reasonable variations and modifications and equivalents thereof should be regarded as falling within the scope of the invention.
Industrial applicability
As described above, the present invention can be widely applied to the industrial field of organic electroluminescent devices.
Claims (6)
1. An organic electroluminescent device, characterized in that,
Comprising a substrate, a first electrode, one or more organic layers including a blue light-emitting layer, a second electrode, and a light extraction layer in this order, wherein the light extraction layer comprises a material satisfying the following conditions (1) to (3),
Wherein, the condition (1) n (@ 450 nm) is more than or equal to 2.00,
The condition (2) that k@420nm is more than or equal to 0.10,
The condition (3) that k@450nm is less than or equal to 0.01,
Where n represents the refractive index in the defined wavelength and k represents the absorption coefficient in the defined wavelength.
2. The organic electroluminescent device as claimed in claim 1, wherein,
Is composed of the second electrode containing metal.
3. The organic electroluminescent device as claimed in claim 1, wherein,
The film thickness of the light extraction layer is below 200 nm.
4. The organic electroluminescent device as claimed in claim 1, wherein,
The PL spectrum peak wavelength of the luminescent material contained in the blue luminescent layer is more than 430nm and less than 500 nm.
5. The organic electroluminescent device as claimed in any one of claims 1 to 4, wherein,
The organic layer further includes a red light emitting layer and a green light emitting layer.
6. The light extraction layer for an organic electroluminescent device as claimed in claim 1, wherein,
The refractive index of the polymer is 2.20 or more at the wavelength of 450nm in the condition (1).
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| KR1020220081228A KR20240003536A (en) | 2022-07-01 | 2022-07-01 | Organic electroluminescent device including light extraction layer |
| KR10-2022-0081228 | 2022-07-01 | ||
| PCT/KR2023/008578 WO2024005436A2 (en) | 2022-07-01 | 2023-06-21 | Organic electroluminescent device including light extraction layer |
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| WO2013179536A1 (en) * | 2012-05-31 | 2013-12-05 | 保土谷化学工業株式会社 | Organic electroluminescent element |
| KR101528663B1 (en) * | 2012-11-14 | 2015-06-15 | 주식회사 엘지화학 | Organic light emitting device and method for preparing the same |
| KR101581033B1 (en) * | 2013-11-01 | 2015-12-29 | 서울대학교산학협력단 | organic light-emitting diode, and display device and illumination |
| KR102127238B1 (en) * | 2013-12-27 | 2020-06-26 | 엘지디스플레이 주식회사 | Organic light emitting device |
| KR102843379B1 (en) * | 2019-08-26 | 2025-08-12 | 주식회사 동진쎄미켐 | organic electroluminescent device comprising a capping layer and compound for capping layer applied to the same |
-
2022
- 2022-07-01 KR KR1020220081228A patent/KR20240003536A/en not_active Ceased
-
2023
- 2023-06-21 WO PCT/KR2023/008578 patent/WO2024005436A2/en not_active Ceased
- 2023-06-21 CN CN202380046643.7A patent/CN119563397A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024005436A3 (en) | 2024-04-25 |
| WO2024005436A2 (en) | 2024-01-04 |
| KR20240003536A (en) | 2024-01-09 |
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