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Observation of the Temperature Dependence of the Dynamics of Photoexcited States in Pristine Tris(8-Hydroxyquinoline) Aluminum (Alq3)

Published online by Cambridge University Press:  10 February 2011

Richard Priestleya ,
Ardie D. Walsera  and
Roger Dorsinville
Richard Priestleya
Affiliation:
Department of Electrical Engineering, The City College and Graduate Center of the City University of New York, 140 Street and Convent Ave., New York, NY 10031. Center for Analysis of Structures and Interfaces(CASI); The City College of New York.
Ardie D. Walsera
Affiliation:
Department of Electrical Engineering, The City College and Graduate Center of the City University of New York, 140 Street and Convent Ave., New York, NY 10031.
Roger Dorsinville
Affiliation:
Department of Electrical Engineering, The City College and Graduate Center of the City University of New York, 140 Street and Convent Ave., New York, NY 10031. New York State Center for Advanced Technology for Ultrafast Photonic Materials and Applications at CUNY. Center for Analysis of Structures and Interfaces(CASI); The City College of New York.
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Abstract

We have investigated the temperature dependence of the dynamics of radiative excited states in pristine thin films of tris(8-hydroxyquinoline) aluminum (Alq3). By measuring the transient photoluminescence (PL) response with subnanosecond resolution, our results revealed an increase in the radiative excited state lifetime and fluorescence quantum yield with decreasing temperature from 300K to 77K. At low temperature we observed a decrease in the bimolecular recombination rate constant, singlet exciton diffusion coefficient and diffusion length. A singlet exciton trapping model is used to explain these results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 695
Copyright
Copyright © Materials Research Society 1998

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