56525-79-2Relevant articles and documents
High-performance sky-blue phosphorescent organic light-emitting diodes employing wide-bandgap bipolar host materials with thermally activated delayed fluorescence characteristics
Zhang, Yuan-Lan,Ran, Quan,Wang, Qiang,Tian, Qi-Sheng,Kong, Fan-Cheng,Fan, Jian,Liao, Liang-Sheng
, (2020)
Up to date, several kinds of thermally activated delayed fluorescence (TADF) host molecules have been rapidly developed to fulfill the increasing demand of high-efficiency phosphorescent organic light-emitting diodes (PHOLEDs). Herein, three wide-bandgap TADF materials BPCN-Cz2Ph, BPCN-2Cz, and BPCN-3Cz are newly designed and synthesized as host materials for sky-blue PHOLEDs. By modulation of carbazole-units in the molecular skeleton, we find that the optimized molecules can realize both high triplet energies and balanced carrier transport properties with obvious TADF properties. The sky-blue PHOLEDs with ultralow phosphor doping ratio employing BPCN-Cz2Ph, BPCN-2Cz, and BPCN-3Cz as host materials demonstrate really high performance with alleviated roll-offs and achieve impressive current efficiencies (CEs) of 46.5 cd A?1, 50.0 cd A?1, and 34.5 cd A?1, power efficiencies (PEs) of 40.6 lm W?1, 46.8 lm W?1, and 34.8 lm W?1, and external quantum efficiencies (EQEs) of 22.2%, 24%, and 15.8%, respectively. More encouragingly, even at an applied luminance of 1000 cd m?2, the EQEs could maintain high levels of 21.0%, 21.5% and 12.8%, respectively, which represents the potential utility value of the new family of these molecules in blue PHOLEDs. Our molecular design strategy provides a practical way to construct promising wide-bandgap TADF host materials with an excellent combination of TADF property, high triplet energy, and balanced carrier-transporting ability for high-performance devices.
1,Ω - bis (3, 6 - diarylcarbazole)-alkane and preparation method thereof
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Paragraph 0030-0040; 0133; 0134; 0201; 0202, (2020/07/24)
The invention relates to 1,omega-bis(3,6-diaryl carbazolyl)-alkane. The 1,omega-bis(3,6-diaryl carbazolyl)-alkane is of a structure (described in the specification), wherein Ar is phenyl, p-methylphenyl, alpha naphthyl or beta naphthyl; and R is ethyl, pr
COMPOUND FOR ORGANIC ELECTRONIC ELEMENT, ORGANIC ELECTRONIC ELEMENT USING THE SAME, AND A ELECTRONIC DEVICE THEREOF
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, (2020/05/30)
The present invention relates to a novel compound, an organic electric element using the same, and an electronic device thereof. According to the present invention, a luminous efficiency, a color purity and a lifespan of the element can be improved and a driving voltage can be lowered. The organic electric element comprises: an anode; a cathode; and an organic material layer formed between the anode and the cathode.