Photoluminescence lifetime of Ir(PPY)3 used for organic light emitting diodes

Abstract

We calculated temperature dependence of photoluminescence (PL) lifetime of fac tris(2-phenylpyridine) iridium (Ir(ppy)3)doped in 4,4'-N,N'-dicarbazole-biphenyl (CBP). The emitting triplet state consists of three zero-field splitting substates. Taking into account non-radiative transitions among these substates, rate equations for the populations of the substates are solved and three PL lifetimes are derived. A good agreement has been obtained for the temperature dependence between the observed lifetime and calculated long lifetime. © 2004, The Institute of Electronics, Information and Communication Engineers. All rights reserved.