Shijiazhuang Chengzhi Yonghua Display Material Co., Ltd.

Songyuan Liu

Zhe Shao

Tianyu Wei

Shiwen Yue

Pengjun Bu

Jian Zhang

Zaifeng Xie

Jiacheng Zhang

The present invention discloses a blue luminescent compound, a blue luminescent composition, and an organic electroluminescent device, display device and lighting device comprising the blue luminescent compound or blue luminescent composition. The blue luminescent compound is selected from one of the following structures. The blue luminescent compound provided by the present invention is used as a host material in a blue luminescent layer. A triplet-triplet fusion process (TTF effect) of the material is improved by using an α-naphthalene substituent. The theoretical exciton utilization rate of the material is increased to 62.5%. The electron transmission rate of the material is improved by introducing an oxygen atom with a large electronegativity, thereby improving the carrier balance. Furthermore, by deuteration of at least part of naphthyl and an anthracene nucleus and combination with semi-deuterated dibenzofuran, the thermal stability of the material is significantly enhanced and at the same time an exciton energy rise caused by vibration in the material is reduced, thereby weakening the problems of damage and deterioration of a material in an adjacent layer by excitons, so that the lifetime of the organic electroluminescent device can be significantly improved, and defects in the prior art are overcome.

Blue luminescent compound, blue luminescent composition, and organic electroluminescent device, display device and lighting device comprising same

The present invention discloses a heteroatom- and cycloalkyl-containing organic compound and an organic electroluminescent device containing the compound. The general structural formula of the organic compound is as represented by Formula I. The organic compound has a boron-nitrogen structure with multiple resonance effect, wherein a cycloalkyl-containing fluorenyl structure is introduced on the basis of the boron-nitrogen structure. The molecular size is greatly expanded by means of the cycloalkyl group, thereby effectively avoiding a concentration quenching effect, while the molecular orientation is enhanced due to the planarity of the fluorenyl group. In order to further improve the efficiency, a heteroatom is introduced to improve the spin coupling effect, and the oscillator strength is enhanced to improve the energy transfer between a host and a guest; furthermore, by means of the heavy atom effect, the conjugation of a luminous moiety is extended while the efficiency is further improved, avoiding excessive photochromic blue shift, so that the organic compound of the present invention has a good efficiency and lifetime performance. Therefore, an organic electroluminescent device manufactured by using the organic compound of the present invention has a good performance in terms of external quantum efficiency and lifetime.

Heteroatom- and cycloalkyl-containing organic compound and organic electroluminescent device containing compound

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Hebei, China

Songyuan Liu