1361061-44-0Relevant academic research and scientific papers
Highly efficient phosphorescent light-emitting diodes by using new host material
Seo,Lee, Kyeong K.,Kim,Lee
, p. 2876 - 2879 (2016)
An electron-transporting triazole (Tz) and hole transporting carbazole (Cz) moieties were introduced into the fluorene structure via a Suzuki coupling reaction. The resulting material, 9-(4′-(9-(4′-(4,5- diphenyl-4H-1,2,4-triazol-3-yl)-[1,1′-biphenyl]-4-yl)-9H-fluoren-9-yl)-[1,1′-biphenyl]-4-yl)-9H-carbazole (Tz-FL-Cz), was synthesized and can be used as the host layer in phosphorescent OLEDs. The synthesized material exhibits wide energy gap (3.46 eV). The absorption and emission maximum of the Tz-FL-Cz was observed at 300 nm and 389 nm, respectively. Blue phosphorescent devices using Tz-FL-Cz as host material exhibited maximum current efficiency of 3.2 cd/A and power efficiency of 1.3 lm/W, respectively.
LUMINESCENT ORGANIC COMPOUND CONTAINING FLUORENE GROUP, AND ORGANIC LIGHT EMITTING DIODE INCLUDING THE SAME
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, (2016/11/24)
The present invention relates to an organic light emitting compound including a fluorine group having a structure in chemical formula 1 where R^1 is carbazole or carbazole derivative, R^2 is triazole or triazole derivative and R^3 or R^4 is one selected from a group consisting of H, CN randomly substituted C1-C4 alkyl or aryl group. In the present invention, provided are an organic light emitting compound, including a fluorine group which has a high efficiency and an outstanding thermostability and emits blue or green with good quality, and an organic light emitting diode including the same.COPYRIGHT KIPO 2015
Modulating the optoelectronic properties of large, conjugated, high-energy gap, quaternary phosphine oxide hosts: Impact of the triplet-excited-state location
Zhang, Zhen,Zhang, Zhensong,Chen, Runfeng,Jia, Jilin,Han, Chunmiao,Zheng, Chao,Xu, Hui,Yu, Donghui,Zhao, Yi,Yan, Pengfei,Liu, Shiyong,Huang, Wei
, p. 9549 - 9561 (2013/07/26)
The purposeful modulation of the optoelectronic properties was realised on the basis of a series of the large, conjugated, phosphine oxide hosts 9,9-bis-{4′-[2-(diphenylphosphinoyl)phenoxy]biphenyl-4-yl}-9H-fluorene (DDPESPOF), 9,9-bis-{3′-(diphenylphosphinoyl)-4′-[2- (diphenylphosphinoyl)phenoxy]biphenyl-4-yl}-9H-fluorene (DDPEPOF), 9-[4′-(9-{4′-[2-(diphenylphosphoryl)phenoxy]biphenyl-4-yl} -9H-fluoren-9-yl)biphenyl-4-yl]-9H-carbazole (DPESPOFPhCz) and 9-[4′-(9-{3′-(diphenylphosphoryl)-4′-[2-(diphenylphosphoryl) phenoxy]biphenyl-4-yl}-9H-fluoren-9-yl)biphenyl-4-yl]-9H-carbazole (DPEPOFPhCz). The last two are quaternary with fluorenyls as linking bridges, diphenylphosphine oxide (DPPO) moieties as electron acceptors and diphenylethers and carbazolyls as two different kinds of electron donors. Owing to the fine-organised molecular structures and the mixed indirect and multi-insulating linkages, all of these hosts achieve the same first triplet energy levels (T1) of 2.86 eV for exothermic energy transfer to phosphorescent dopants. The first singlet energy levels (S1) and the carrier injection/transportation ability of the hosts were accurately modulated, so that DPESPOFPhCz and DPEPOFPhCz revealed extremely similar optoelectronic properties. However, the T1 state of the former is localised on fluorenyl, whereas the carbazolyl mainly contributes to the T1 state of the latter. A lower driving voltages and much higher efficiencies of the devices based on DPESPOFPhCz indicated that the chromophore-localised T 1 state can suppress the quenching effects through realising independent contributions from the different functional groups to the optoelectronic properties and the embedding and protecting effect on the T 1 states by peripheral carrier transporting groups. Electrophosphorescence: The modulation of the optoelectronic properties for a series of large, conjugated, quaternary phosphine oxide hosts was realised by mixed indirect and multi-insulating linkages (see figure). The impact of the triplet-state location of the hosts on the electrophosphorescent performance was investigated. A host with a fluorenyl-localised triplet state realised lower driving voltages and higher efficiencies. Copyright
