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Organic room-temperature phosphorescent material and electroluminescent device

A room temperature phosphorescence and optoelectronic device technology, applied in the fields of luminescent materials, electric solid devices, organic chemistry, etc., can solve the problems of low yield and short life of organic phosphorescence materials, achieve long room temperature phosphorescence, realize ultra-long room temperature phosphorescence and strong Phosphorescence Quantum Yield, Effect of Extending Phosphorescence Lifetime

Pending Publication Date: 2020-01-24
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an organic room temperature phosphorescent material and an electro-optical device, aiming at solving the problems of short life and low yield of existing organic phosphorescent materials

Method used

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  • Organic room-temperature phosphorescent material and electroluminescent device
  • Organic room-temperature phosphorescent material and electroluminescent device
  • Organic room-temperature phosphorescent material and electroluminescent device

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preparation example Construction

[0035] The preparation method of compound 1 is introduced below. The reaction formula is as follows:

[0036]

[0037] Specific preparation process: under a nitrogen atmosphere, 1,3-difluoro-5-iodobenzene (3.6 g, 15 mmol) and carbazole (5.01 g, 30 mmol) were added to 120 ml of DMF to obtain a mixture. Cesium carbonate (19.5 g, 60 mmol) was added to the mixture, and reacted at 150° C. for 24 hours. After the reaction, 200ml of water was added, then extracted with dichloromethane (3*150ml), dried and spin-dried, and put on the column to obtain 4g of crude product. After recrystallization, it was purified twice in a sublimation furnace with a sublimation temperature of 200°C. Finally, 2.3 g of pure product was obtained.

[0038] The preparation method of compound 4 is introduced below. The reaction formula is as follows:

[0039]

[0040] Specific preparation process: under an inert gas protective atmosphere, dissolve compound 1 in deuterated benzene, add deuterated tr...

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Abstract

The invention discloses an organic room-temperature phosphorescent material and an electroluminescent device. The material is based on a structure with 1,3-dicarbazolyl benzene as a mother nucleus andmodified by halogen atoms or pseudo-halogen groups, may have very long room-temperature phosphorescence (with lifetime as long as several seconds), and also has very high phosphorescent quantum yield(up to 40% or above). Furthermore, on the basis of the structure, the structural stability of molecules can be improved by introducing a modification group or deuteration to a carbazolyl group, and phosphorescence lifetime can be further prolonged by deuteration because of the self heavy-atom effect, so triplet-state molecular orbital coupling effect is improved. Furthermore, a series of new mother nucleuses are designed through the replacement of carbazole similar structures and the replacement of phenyl groups, but the main body structure is not changed, and super-long room-temperature phosphorescence and strong phosphorescence quantum yield are also realized after the same modification.

Description

technical field [0001] The invention relates to the field of organic photoelectric materials, in particular to an organic room-temperature phosphorescent material and an electro-optical device. Background technique [0002] In 1979, Deng Qingyun discovered the electroluminescence phenomenon of organic fluorescent materials. Since then, organic light-emitting diodes (OLEDs) have been widely concerned and researched, and have been applied to a new generation of lighting and display technologies. In the process of electroluminescence, two kinds of excitons, 25% singlet excitons and 75% triplet excitons, are produced, while traditional fluorescent materials can only emit light through singlet excitons, and a large number of triplet excitons It is wasted in the form of non-radiative attenuation, so the device efficiency of traditional fluorescent materials is low, and the upper limit of internal quantum efficiency is only 25%. In contrast, phosphorescent materials can utilize th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D209/86C07D209/88C07D209/08C07D207/325C07D405/14C07D403/04C07D403/14C07D487/04C07D487/14C07D401/14C07D491/153C07D491/048C07D491/147C09K11/06H01L51/50H01L51/54
CPCC07D209/86C07D209/88C07D209/08C07D207/325C07D405/14C07D403/04C07D403/14C07D487/04C07D487/14C07D401/14C07D491/153C07D491/048C07D491/147C09K11/06C07B2200/05C09K2211/1007C09K2211/1011C09K2211/1029C09K2211/1059C09K2211/1088H10K85/615H10K85/6574H10K85/657H10K85/6572H10K50/11
Inventor 孟鸿施明孙越
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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