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Photoluminescence and Electroluminescence Quenching in 8-Hydroxyquinoline Aluminum Chelates

Published online by Cambridge University Press:  10 February 2011

Xian-man Zhang ,
Keith A. Higginson  and
Fotios Papadimitrakopoulos
Xian-man Zhang
Affiliation:
Department of Chemistry, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269.
Keith A. Higginson
Affiliation:
Department of Chemistry, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269.
Fotios Papadimitrakopoulos
Affiliation:
Department of Chemistry, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269.
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Abstract

The present communication proposes a mechanism for photoluminescence (PL) and electroluminescence (EL) quenching in aluminum(III) 8-hydroxyquinoline (Alq3) chelates. Our experiments indicate that in the presence of moisture, ligand exchange of 8-hydroxyquinoline with water can occur. At elevated temperatures, the liberated 8-hydroxyquinoline undergoes a condensation reaction in the presence of traces of oxygen, generating a dark, non-emissive polymeric compound. Spectroscopic and electrochemical methods were used to determine the band gap and energy levels (highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO)) of this byproduct. Steady state PL experiments indicate that (0.5 to 1%) concentration of this byproduct, evenly dispersed in Alq3 films, results in dramatic PL quenching. Deliberate insertion of an approximately 50 Å thick film of this byproduct into the interface of a poly(p-phenylenevinylene)/Alq3 light emitting diode (LED) completely quenches the EL as well. Initial data suggest an energy transfer quenching mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 413: Symposium W – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials III , 1995 , 43
Copyright
Copyright © Materials Research Society 1996

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