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
CN110724088APending Publication Date: 2020-01-24PEKING UNIV SHENZHEN GRADUATE SCHOOL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PEKING UNIV SHENZHEN GRADUATE SCHOOL
Publication Date
2020-01-24

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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.
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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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