Abstract
Thin films of triphenylamine dimer, N, N′-bis(3-methylphenyl)- N, N′-bis(phenyl)-benzidine (TPD), fac tris(2-phenylpyridine) iridium (Ir(ppy) 3) doped TPD, and platinum octaethyl porphine (PtOEP) doped TPD have been characterized by photoluminescence measurements at several excitation wavelengths in the temperature range from 10 K to room temperature. The investigated doped films are phosphorescent OLED materials whereby TPD acts as triplet reservoir for Ir(ppy) 3 (endothermic transfer system) and as pathway intermediate for PtOEP (exothermic transfer system). At low temperature, phosphorescence of TPD was observed. At short-wavelength excitation, where TPD is absorbing, Förster-type energy transfer to Ir(ppy) 3 and PtOEP was resolved. The temperature-dependent phosphorescence studies revealed Dexter-type triplet–triplet forth and back excitation transfer between Ir(ppy) 3 and TPD and are compatible with Dexter-type triplet–triplet forward excitation transfer from TPD to PtOEP.
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