884336-44-1Relevant articles and documents
C2-, C3- spirobifluorene fused carbazole modified triazine as an electron transport type host of exciplex
Patil, Vilas Venunath,Lim, Junseop,Lee, Jun Yeob
, (2021)
In this work, we report a novel spirobifluorene carbazole (SBFCbz) donor developed by fusion of carbazole with 9,9′-spirobi[fluorene] (SBF) unit. The newly synthesized SBFCbz donor combined with a diphenyl triazine acceptor to offer an 5'-(4,6-diphenyl-1,3,5-triazin-2-yl)-5′H-spiro[fluorene-9,11′-indeno[1,2-b]carbazole] (SBFTrz) host which played a role of an n-type host. An exciplex host of SBFTrz: 9-([1,1′-biphenyl]-4-yl)-9′-phenyl-9H,9′H-3,3′-bicarbazole (BPBPCz) was developed by combining it with a p-type BPBPCz host. The developed exciplex host showed triplet energy of 2.59 eV, making it a suitable host for the green and red phosphorescent organic light-emitting diodes (PhOLEDs). The PhOLEDs fabricated using the exciplex host system offered excellent charge balance in the emitting layer, which resulted in above 20% external quantum efficiency (EQE) and resistance to the efficiency roll-off at high luminance. The green and red PhOLEDs developed showed the maximum EQE/EQE at 1000 cd/m2 of 22.0/21.7% and 26.2/23.2%, respectively. Besides, the SBFTrz: BPBPCz exciplex host-based green and red devices showed three- and five-fold enhancement, respectively, in the operational lifetime compared to their corresponding SBFTrz single host devices. Thus, the above results confirmed the suitability of the SBFTrz: BPBPCz exciplex as a host to develop PhOLEDs with high efficiency, improved stability at high luminance, and a long operational lifetime.
Frequency-Upconverted Stimulated Emission by Up to Six-Photon Excitation from Highly Extended Spiro-Fused Ladder-Type Oligo(p-phenylene)s
Jiang, Yi,Li, King Fai,Gao, Kun,Lin, He,Tam, Hoi Lam,Liu, Yuan-Yuan,Shu, Yu,Wong, Ka-Leung,Lai, Wen-Yong,Cheah, Kok Wai,Huang, Wei
, p. 10007 - 10015 (2021/04/15)
Frequency-upconverted fluorescence and stimulated emission induced by multiphoton absorption (MPA) have attracted much interest. As compared with low-order MPA processes, the construction of high-order MPA processes is highly desirable and rather attracti
Compound, organic light emitting diode, and display device
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Paragraph 0095; 0099-0102, (2020/10/14)
The invention provides a compound for fabricating an electron transport layer. The compound has a molecular formula as described in the specification. The invention also provides an organic light emitting diode and an organic light emitting diode display