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27 February 2002 Electroluminescence- and electrically-detected magnetic resonance studies of spin one-half-polaron and singlet-exciton dynamics in multilayer small molecular organic light-emitting devices
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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.
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Gang Li and Joseph Shinar "Electroluminescence- and electrically-detected magnetic resonance studies of spin one-half-polaron and singlet-exciton dynamics in multilayer small molecular organic light-emitting devices", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457465
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