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Phosphorescence dynamics and spin-lattice relaxation of the OLED emitter Ir(btp)₂(acac)

Finkenzeller, Walter J. ; Thompson, M. E. ; Yersin, Hartmut


The lowest triplet state T₁ of Ir(btp)₂(acac) doped into CH₂Cl₂ 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. ...


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