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Proceedings Paper

Electroluminescence- and electrically-detected magnetic resonance studies of spin one-half-polaron and singlet-exciton dynamics in multilayer small molecular organic light-emitting devices
Author(s): Gang Li; Joseph Shinar
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Paper Abstract

The electroluminescence (EL)- and electrically-detected magnetic resonance (ELDMR and EDMR, respectively) of tris- (8-hydroxyquinoline) Al (Alq3)]/[buffer]/Al-based organic light-emitting devices (OLEDs) are described. Positive spin ½ ELDMR and EDMR observed at T<60K are similar to the typical photoluminescence-detected magnetic resonance of (pi) -conjugated polymers, and consequently attributed to enhanced polaron recombination and consequent reduction of singlet exciton quenching by trapped and free polarons. A negative spin ½ EL- and current-quenching (negative) resonance is observed at T>=60 K. Its amplitude increases with T, and it is much stronger in devices with an AlOx buffer layer than in those with a CsF buffer. Its behavior is consistent with magnetic resonance enhancement of the spin-dependent formation of dianions at the organic/cathode interface.

Paper Details

Date Published: 27 February 2002
PDF: 9 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457465
Show Author Affiliations
Gang Li, U.S. Dept. of Energy and Iowa State Univ. (United States)
Joseph Shinar, U.S. Dept. of Energy and Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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