標題: Bis(diphenylamino)-9,9 '-spirobifluorene functionalized Ir(III) complex: a conceptual design en route to a three-in-one system possessing emitting core and electron and hole transport peripherals
作者: Chen, Hsiao-Fan
Wong, Ken-Tsung
Liu, Yi-Hung
Wang, Yu
Cheng, Yi-Ming
Chung, Min-Wen
Chou, Pi-Tai
Su, Hai-Ching
照明與能源光電研究所
Institute of Lighting and Energy Photonics
公開日期: 2011
摘要: Conceptual design of a three-in-one (luminescence chromophore with electron and hole transports) system was demonstrated by a functionalized Ir(III) complex 3, in which 4,5-diazafluorene and bis(diphenylamino) serve as electron and hole transporting sites, respectively. The poor emission quantum yield of 3 was systematically examined via a series of photophysical studies in combination with theoretical approaches. The far lifting of the pi-electron from -NPh(2) renders virtually no (3)MLCT contribution to the lowest transition in the triplet manifold as compared with that of the parent model 2 without amino substituents. With an empirical approach, we conclude that an energy gap law may account for the major deactivation process. A light-emitting electrochemical cell (LEC) device based on 3 shows peak EQE, peak current efficiency and peak power efficiency at 2.4 V of 0.020%, 0.013 cd A(-1) and 0.017 lm/W, respectively. The low device efficiencies are in accordance with the low PL quantum yield, stemming from the ligand-centered radiationless deactivation. The conceptual design presented here should provide valuable information for future progress en route to an ideal three-in-one system suited for OLEDs.
URI: http://hdl.handle.net/11536/26022
http://dx.doi.org/10.1039/c0jm02097d
ISSN: 0959-9428
DOI: 10.1039/c0jm02097d
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 21
Issue: 3
起始頁: 768
結束頁: 774
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