Journal
OPTICAL MATERIALS
Volume 27, Issue 12, Pages 1859-1863Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2004.11.003
Keywords
phosphorescence; organic light emitting diodes; lifetime; Ir(ppy)(3)
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A calculation has been done to explain the temperature dependence of photoluminescence (PL) lifetime of fac tris(2-phenylpyridine) iridium (Ir(ppy)(3)) observed in polycarbonate (PC) at 8 295 K. Taking into account (1) three zero-field splitting substates in the lowest-energy triplet state and (2) one-phonon non-radiative transitions among these substates, the rate equations have been obtained for the populations of these substates. We derived the PL time response with three PL lifetimes, which increase with decreasing temperature from 300 K to 1 K. A good agreement has been obtained between the calculated PL lifetimes and the observed ones. (c) 2004 Elsevier B.V. All rights reserved.
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