Purine derivative and organic electroluminescence device thereof
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A technology of electroluminescent devices and derivatives, which is applied in the fields of electro-solid devices, electrical components, light-emitting materials, etc., can solve the problem of low electron and hole recombination efficiency, low luminous efficiency of light-emitting devices, and inability to effectively balance carriers, etc. problem, to achieve the effect of enhanced charge migration orientation, less crystallization, and easier charge dispersion.
Inactive Publication Date: 2018-03-16
CHANGCHUN HYPERIONS TECH CO LTD
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[0006] In organic electroluminescent devices, because the transport velocity of electrons in carriers is lower than that of holes, the recombination efficiency of electrons and holes is low and the recombination area is shifted, which leads to the luminous efficiency of organic electroluminescent devices Low, uneven light color, low life
[0007] Therefore, in practical applications, the carrier transmission of each functional layer is uneven, and the injection of carriers cannot be effectively balanced. With the further improvement of market requirements for OLED devices, higher luminous efficiency, longer life, and lower cost have become The development trend of OLED devices, so how to develop a luminescent material layer and electron transport layer material with high luminous efficiency and high electron transport performance, improve electron mobility, promote carrier injection balance, and then make the device have higher luminous efficiency and longer life longer becomes an urgent problem to be solved
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Embodiment 1
[0062] [Example 1] Synthesis of Compound 2
[0063]
[0064] Step1: Under the protection of nitrogen, add 8-bromo-2,6-dichloro-7H-purine (2.25g, 8.4mmol), 2-naphthylboronic acid (1.58g, 9.2mmol) and tetrakistriphenylphosphine palladium into the reaction vessel (0.09g, 0.08mmol), potassium carbonate (3.48g, 25.2mmol), toluene 60mL, ethanol 20mL and distilled water 20mL, stirred at 120°C for 3h. After the reaction was finished, stop the reaction with distilled water, extract with ethyl acetate, and use MgSO 4 After drying, the solvent was distilled off under reduced pressure, and then purified by silica gel column chromatography to obtain Intermediate 2-1 (1.72 g, 65%).
[0065] Step2: Under nitrogen protection, add 2-1 (2.65g, 8.4mmol), 2-naphthylboronic acid (3.18g, 18.5mmol), tetrakistriphenylphosphine palladium (0.09g, 0.08mmol), potassium carbonate ( 3.48g, 25.2mmol), toluene 60mL, ethanol 20mL and distilled water 20mL, stirred at 120°C for 3h. After the reaction was fi...
Embodiment 2
[0067] [Example 2] Synthesis of compound 4
[0068] According to the synthetic method of compound 2, compound 4 (3.11 g, 59%) was obtained.
[0069]
Embodiment 3
[0070] [Example 3] Synthesis of Compound 5
[0071] According to the synthetic method of compound 2, compound 5 (2.69 g, 64%) was obtained.
[0072]
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Abstract
The invention provides a purine derivative and an organic electroluminescence device thereof, and relates to the technical field of organic photo-electricity materials. Different ligands are connectedon a purine main body structure, molecular weight, pi conjugated degree, energy gap width and eletrophilicity of materials are adjusted, the purine derivative is high in luminescence efficiency, electronic transmission capacity is enhanced, carrier injection can be effectively balanced, the purine derivative is good in film forming property and not easily crystallized, and a synthetic method is simple and easy to operated. The materials can be used for preparation of the organic electroluminescence device and particularly serve as a luminescent layer and an electron transfer layer of the organic electroluminescence device, and the organic electroluminescence device of the purine derivative has the advantages of high luminescence efficiency and long service life.
Description
technical field [0001] The invention relates to the technical field of organic photoelectric materials, in particular to a purine derivative and an organic electroluminescence device thereof. Background technique [0002] Organic electroluminescent device (OLED), as a new type of flat panel display, has the characteristics of self-illumination, wide viewing angle, full curing, full color, fast response, high brightness, low driving voltage, thin thickness, light weight, and In recent years, OLED has been more and more used in the display market due to the characteristics of making large-size and curved panels, and has become the most potential panel display technology at present. [0003] A key element of organic electroluminescent devices is organic light-emitting materials, which can be roughly divided into three categories according to the light-emitting mechanism: traditional fluorescent materials, phosphorescent materials, and thermally activated delayed fluorescence (T...
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