Phosphorescence dynamics and spin-lattice relaxation of the OLED emitter Ir(btp)2(acac)

被引：30

作者：

Finkenzeller, Walter J.

Thompson, Mark E.

Yersin, Hartmut ^{[1
]}

机构：

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

[2] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA

来源：

CHEMICAL PHYSICS LETTERS | 2007年 / 444卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2007.07.022

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：

The lowest triplet state T-1 of Ir(btP)(2)(acac) doped into CH2Cl2 is studied by site-selective and time-resolving emission and by excitation spectroscopy at cryogenic temperatures. Different sites due to different environments of Ir(btP)(2)(acac) show dissimilar intensity distributions of the substate emissions, zero-field splittings, emission decay times, and spin-lattice relaxation (SLR) times. Temperature dependent investigations of the SLR processes reveal the importance of the direct process and the Orbach process. Moreover, the emitting T-1 state is assigned as (LC)-L-3 (ligand-centered) state with significant (MLCT)-M-1,3 (metal-to-ligand charge transfer) perturbation. This classification is related to the usability of phosphorescent emitters in OLEDs. (C) 2007 Elsevier B.V. All rights reserved.

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页码：273 / 279

页数：7

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