1313400-54-2Relevant academic research and scientific papers
π-π stacking: a strategy to improve the electron mobilities of bipolar hosts for TADF and phosphorescent devices with low efficiency roll-off
Cai, Minghan,Song, Xiaozeng,Zhang, Dongdong,Qiao, Juan,Duan, Lian
, p. 3372 - 3381 (2017)
A series of D-π-A type bipolar hosts based on triphenylene/carbazole were designed and synthesized. π-π stacking of the triphenylene units between two adjacent molecules renders these hosts high electron mobilities above 1 × 10?4 cm2 V?1 s?1, and their electron and hole mobilities can be regulated through varying the connection position and π moieties. Due to more balanced charge mobilities, a D1-based green thermally activated delayed fluorescence (TADF) device achieved the highest external quantum efficiency (EQE) of 16.3%, and its EQE could still maintain 15.3% and 13.8% at the high luminance of 5000 cd m?2 and 10?000 cd m?2, respectively. D1-based green phosphorescent devices also exhibited the highest EQE of 18.6% with a reduced roll-off to 17.6% at 5000 cd m?2 and 16.2% at 10?000 cd m?2.
ORGANIC COMPOUND, LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE
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Page/Page column 48-49, (2012/04/05)
A novel substance with which an increase in life and emission efficiency of a light-emitting element can be achieved is provided. A carbazole compound having a structure represented by General Formula (G1) is provided. Note that a substituent which makes the HOMO level and the LUMO level of a compound in which a bond of the substituent is substituted with hydrogen deep and shallow, respectively is used as each of substituents in General Formula (G1) (R1, R2, Ar3, and α3). Further, a substituent which makes the band gap (Bg) and the T1 level of a compound in which a bond of the substituent is substituted with hydrogen wide and high is used as each of the substituents in General Formula (G1) (R1, R2, Ar3, and α3).
