Organic light-emitting device comprising light extraction layer

A technology of electroluminescent devices and light extraction layers, which is applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of restricting the development of top-emitting OLEDs, affecting the color purity of devices, and increasing the angle dependence, so as to avoid the problems of devices The effect of sharp roll-off of efficiency, improvement of light extraction efficiency, and improvement of light extraction efficiency

Pending Publication Date: 2022-03-01
CHANGCHUN HYPERIONS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current top-emitting devices still have problems such as low color purity and high angle dependence, which seriously restrict the development of top-emitting OLEDs.
[0004] At present, due to the obvious microcavity effect of top-emitting devices, on the one hand, the microcavity effect can narrow the spectrum and improve the light extraction efficiency of organic electroluminescent devices, but at the same time, the microcavity effect will also lead to higher angle dependence, affecting The color purity of the device, so how to reduce the angular dependence of the top-emitting device and improve the color purity of the device under the premise of ensuring the light extraction efficiency is an urgent problem to be solved

Method used

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  • Organic light-emitting device comprising light extraction layer
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  • Organic light-emitting device comprising light extraction layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] [Synthesis Example 1] Preparation of a-2

[0120]

[0121] d-1 (25.80 g, 150 mmol), e-1 (33.75 g, 152 mmol), K 2 CO 3 (34.55g, 250mmol), 500mL mixed solvent (toluene:ethanol:water=2:1:1), and then replaced the air with nitrogen three times, and then added Pd (PPh 3 ) 4 (1.16g, 1.0mmol), under the protection of nitrogen, the reaction was stirred at reflux temperature for 3h, after the reaction was completed, cooled to room temperature, liquid separation, after the organic phase was separated from the water phase, the organic phase was washed with water, washed with anhydrous sulfuric acid Dry over sodium, filter to remove anhydrous sodium sulfate, concentrate under reduced pressure and rotate to evaporate the solvent, then recrystallize the crude product with toluene to obtain a-2 (27.88 g, yield 69%); HPLC purity ≥99.32%.

[0122] According to the above-mentioned synthetic mode, the present invention also synthesized the relevant intermediates in the following tab...

Embodiment 2

[0124] [Synthesis Example 2] Preparation of Compound 1

[0125]

[0126] Preparation of Intermediate A-1:

[0127] A-1 (18.20g, 83mmol), b-1 (22.65g, 80mmol), sodium tert-butoxide (11.53g, 120mmol), 300mL toluene solvent were added to the reaction flask in turn, and then the air was replaced by nitrogen three times, and then Join Pd 2 (dba) 3 (0.73g, 0.8mmol), tri-tert-butylphosphine (0.32g, 1.6mmol), under the protection of nitrogen, the reaction was stirred at reflux temperature for 4.5h, after the reaction was completed, cooled to room temperature, the reactant was filtered through diatomaceous earth After filtration, the solvent was removed by rotary distillation under reduced pressure, and the obtained crude product was recrystallized from ethyl acetate to obtain Intermediate A-1 (28.66 g, yield 85%); HPLC purity≥99.57%.

[0128] Preparation of compound 1:

[0129] Add intermediate A-1 (26.98g, 64mmol), c-1 (17.83g, 60mmol), sodium tert-butoxide (8.64g, 90mmol), 20...

Embodiment 3

[0131] [Synthesis Example 3] Preparation of Compound 38

[0132]

[0133] Replace a-1, b-1, c-1 in Synthesis Example 2 with equimolar a-2, b-2, c-2, and follow the same preparation method as Synthesis Example 2 to obtain compound 38 ( 36.30 g); HPLC purity > 99.74%.

[0134] Mass spectrum m / z: 737.2743 (theoretical: 737.2719). Theoretical element content (%) C 56 H 35 NO: C, 91.15; H, 4.78; N, 1.90. Measured element content (%): C, 91.18; H, 4.82; N, 1.88.

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Abstract

The invention provides an organic light-emitting device comprising a light extraction layer, and particularly relates to the technical field of organic photoelectricity. The light extraction material provided by the invention has higher polarizability, better planarity, stronger rigidity and higher compound density, so that the refractive index of the material is improved, and the light extraction efficiency can be improved when the material is applied to a light extraction layer. Meanwhile, when the light extraction layer material is applied to the organic electroluminescent device, the problem of angle dependence caused by the microcavity effect of a top emission device can be solved, and the organic electroluminescent device has high color purity. The light extraction material has high glass transition temperature and thermal stability, can isolate water and oxygen in air, avoids rapid roll-off of the efficiency of the device, and prolongs the service life of the device.

Description

technical field [0001] The present invention relates to the technical field of organic optoelectronics, and in particular, to an organic electroluminescence device comprising a light extraction layer. Background technique [0002] Organic Light-Emitting Diode (OLED) refers to the ITO glass transparent electrode and metal electrode as the anode and cathode of the device, respectively. Driven by a certain voltage, electrons and holes are injected from the cathode and anode to electrons and holes, respectively. The hole transport layer then migrates to the light-emitting layer respectively, where they meet to form excitons to excite the light-emitting molecules, which emit visible light after being irradiated. OLED has many advantages such as low operating voltage, high brightness, high efficiency, high contrast, thin thickness, light weight, wide viewing angle, wide operating temperature range, simple process, and can be fabricated on flexible substrates, and has a very broad ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/50
CPCH10K85/00H10K50/00H10K50/85
Inventor 郭建华李梦茹孙月
Owner CHANGCHUN HYPERIONS TECH CO LTD
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