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Electroluminescence of OLED based IrQ(ppy)2-5Cl organometallic compound: Theoretical considerations

S. POLOSAN1,* , I. C. CIOBOTARU1

Affiliation

  1. National Institute for Materials Physics, Bucharest-Magurele 077125, Romania

Abstract

The electroluminescence and current density versus applied voltage were measured for the OLED cell structure which contain IrQ(ppy)2-5Cl as emitting layer. Two parameters, emission quantum yield and charge transport behaviors, which influences the electroluminescence, were modeled mainly concerning the non-radiative rate constants, delocalization of the HOMO and LUMO states, internal reorganization energies and bandgap of IrQ(ppy)2-5Cl. The non-radiative constant rates were determined using the three zero-field splitting substates responsible for the phosphorescence model and shows an increasing of these rates together with a strong interaction with the polystyrene matrix. Delocalization of the HOMO and LUMO states on the quinoline ligand, together with the small reorganization energies and bandgap lowering indicates good charge transport properties for the IrQ(ppy)2-5Cl compound..

Keywords

OLED, Electroluminescence, Charge transport, DFT.

Submitted at: Sept. 27, 2013
Accepted at: Jan. 22, 2014

Citation

S. POLOSAN, I. C. CIOBOTARU, Electroluminescence of OLED based IrQ(ppy)2-5Cl organometallic compound: Theoretical considerations, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 1-2, pp. 87-92 (2014)