Intermolecular interaction and a concentration-quenching mechanism of phosphorescent Ir(III) complexes in a solid film

被引:327
作者
Kawamura, Y
Brooks, J
Brown, JJ
Sasabe, H
Adachi, C
机构
[1] JST, CREST Program, Tokyo 1500011, Japan
[2] UDC, Ewing, NJ 08618 USA
[3] CIST, Dept Photon Mat Sci, Chitose, Hokkaido 0668655, Japan
[4] Kyushu Univ, Ctr Future Chem, Fukuoka 8190395, Japan
关键词
D O I
10.1103/PhysRevLett.96.017404
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Solid-state self-quenching processes of highly efficient Ir(III) phosphorescent emitters are investigated by the measurement of thin film photoluminescence quantum efficiency and transient lifetime as a function of doping concentration in a host matrix. The radiative decay rate constant is found to be independent from the average distance between dopant molecules (R), and the concentration-quenching rate constant is shown to be dependent on R-6. The quenching dependence on R strongly suggests that luminescent concentration quenching in a phosphorescent Ir(III) complex:host film is controlled by dipole-dipole deactivating interactions as described by the Forster energy transfer model.
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页数:4
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