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

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...

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Bibliographic Details
Published in:Physical review letters 2006-01, Vol.96 (1), p.017404-017404, Article 017404
Main Authors: Kawamura, Yuichiro, Brooks, Jason, Brown, Julie J, Sasabe, Hiroyuki, Adachi, Chihaya
Format: Article
Language:English
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Summary: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 Förster energy transfer model.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.017404