期刊
CHEMICAL PHYSICS
卷 308, 期 1-2, 页码 93-102出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2004.07.051
关键词
lr(ppy)(3); organometallic complex; MLCT-complex; doped film; neat film; phosphorescence quantum yield; phosphorescence lifetime; singlet-triplet absorption; stimulated emission cross-section; triplet triplet annihilation; amplified spontaneous emission
The absorption and emission spectroscopic behaviour of cyclometalated fac-tris(2-phenylpyridine) iridium(III) [Ir(ppy)(3)] is studied at room temperature. Liquid solutions, doped films, and neat films are investigated. The absorption cross-section spectra including singlet triplet absorption, the triplet-singlet stimulated emission cross-section spectra, the phosphorescence quantum distributions, the phosphorescence quantum yields and the phosphorescence signal decays are determined. In neat films fluorescence self-quenching occurs, in diluted solid solution (polystyrene and dicarbazole-biphenyl films) as well as deaerated liquid solution (toluene) high phosphorescence quantum yields are obtained, and in air-saturated liquid solutions (chloroform, toluene, tetrahydrofuran) the phosphorescence efficiency is reduced by triplet oxygen quenching. At intense short-pulse laser excitation the phosphorescence lifetime is shortened by triplet-triplet annihilation. No amplification of spontaneous emission in the phosphorescence spectral region was observed indicating higher excited-state absorption than stimulated emission. (C) 2004 Elsevier B.V. All rights reserved.
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