Abstract
The lowest triplet state T 1 of Ir(btp) 2(acac) doped into CH 2Cl 2 is studied by site-selective and time-resolving emission and by excitation spectroscopy at cryogenic temperatures. Different sites due to different environments of Ir(btp) 2(acac) show dissimilar intensity distributions of the substate emissions, zero-field splittings, emission decay times, and spin-lattice relaxation (SLR) times. Temperature dependent investigations of the SLR processes reveal the importance of the direct process and the Orbach process. Moreover, the emitting T 1 state is assigned as 3 LC (ligand-centered) state with significant 1,3MLCT (metal-to-ligand charge transfer) perturbation. This classification is related to the usability of phosphorescent emitters in OLEDs.
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