854952-58-2Relevant articles and documents
Three new carbazole derivatives with high thermal stability as host for efficient green phosphorescent organic-light emitting diodes
Ji, Jun,Li, Pengfei,Tian, Qifeng,Feng, Weiliang,Wu, Changjiang
, (2019)
Three host materials, DCzPh, DCzPy and DCzPm, were developed for phosphorescent organic light emitting devices (PhOLEDs). These three compounds exhibit high triplet energy level (ET > 2.7 eV), suitable glass transition temperatures (Tg > 130 °C), appropriate highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels, and balanced charge-transporting properties. Green PhOLEDs were fabricated by utilizing these three materials as hosts and the efficiencies were satisfactory. Device G3 based on DCzPm exhibited high efficiency with the maximum external quantum efficiency (EQE) of 17.2%, and even at the brightness of 1000 cd m?2, the EQE reached 17.1%, demonstrating its low efficiency roll-off. The above results indicate that these host materials possess great commercial potential in OLED applications.
Preparation method of N-arylcarbazole-3-boric acid
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, (2021/02/06)
The invention discloses a preparation method of N-arylcarbazole-3-boric acid, and belongs to the field of liquid crystal intermediates. The preparation method comprises the following steps: coupling carbazole with aryl halide in the presence of alkali to generate N-arylcarbazole, enabling the N-arylcarbazole to react with a bromination reagent to generate Naryl-3, 6-dibromo carbazole, enabling theNaryl-3, 6-dibromo carbazole to react with borate and butyl lithium by a one-pot method, and carrying out hydrolyzing to obtain N-arylcarbazole-3-boric acid. According to the method, dibromides whichare easy to purify are generated during bromination, monosubstituted products are generated by controlling the using amount of the lithiation reagent and the boric acid ester during lithiation, the method is verified on the scale of dozens of kilograms, and the method has the prospect of industrial methods.
Organic compound, and organic electroluminescent device and electronic device using the same
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Paragraph 0138-0140; 0141-0143, (2021/11/10)
The present invention relates to an organic compound and an organic electroluminescent device and an electronic device using the same, wherein the organic compound has a structure formed by combining an indole carbazole-based planar conjugated group in a fused manner and a dibenzofuran substituted with an aryl group. The structure has higher hole mobility and higher energy transfer efficiency, and is suitable for being used as a light-emitting host material in an organic electroluminescent device. When the organic compound is used as a light emitting host material in an organic electroluminescent device, the light emitting efficiency and the service life of the device can be effectively improved, and the working voltage is reduced.