Emission and absorption of Ir(ppy)2(CO)(Cl) -: temperature dependence, phosphorescence decay dynamics, and assignment of excited states

被引：40

作者：

Finkenzeller, WJ

Stössel, P

Yersin, H ^{[1
]}

机构：

[1] Univ Regensburg, Inst Theoret & Phys Chem, D-93053 Regensburg, Germany

[2] Cov Organ Semicond GmbH, Res & Dev, D-65926 Frankfurt, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 397卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2004.08.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Emission spectra and decay times of Ir(ppy)(2)(CO)(Cl) dissolved in THF were recorded for 1.2 K less than or equal to T less than or equal to 300 K. The emission stems from a triplet state T-1 which is split into three substates by less than 1 cm(-1). We classify this state as (LC)-L-3(ligand centered, ppypipi*) state. At T = 1.2 K, the substates emit independently with three individual decay times (tau(I) = 300 mus, tau(II) = 85 mus, tau(III) = 9 mus) due to slow equilibration processes, i.e. slow spin-lattice-relaxation, between the substates. With increasing temperature, the emission decay becomes monoexponential as a result of fast equilibration. The results are compared to the spectroscopic behavior of Ir(ppy)(3) which represents a metal-to-ligand charge transfer (MLCT)-M-3 emitter. (C) 2004 Elsevier B.V. All rights reserved.

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页码：289 / 295

页数：7

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