Abstract
Emission spectra and decay times of fac-Ir(ppy)₃ dissolved in THF were registered for 1.2 K =< T =< 300 K and magnetic fields (at T = 1.5 K) up to B = 10 T. Three emissive triplet substates I, II, and III could be identified and classified as substates of a ³MLCT term of ³(Ir5d-ppyπ*) character. The energy separations and decay times are ΔE(II,I) = 13.5 cm⁻¹, ΔE(III,I) = 83 cm⁻¹ and τ(I) = 145 ...
Abstract
Emission spectra and decay times of fac-Ir(ppy)₃ dissolved in THF were registered for 1.2 K =< T =< 300 K and magnetic fields (at T = 1.5 K) up to B = 10 T. Three emissive triplet substates I, II, and III could be identified and classified as substates of a ³MLCT term of ³(Ir5d-ppyπ*) character. The energy separations and decay times are ΔE(II,I) = 13.5 cm⁻¹, ΔE(III,I) = 83 cm⁻¹ and τ(I) = 145 μs, τ(II) = 11 μs, τ(III) = 750 ns. All three substates are involved in the emission process at 300 K resulting in an average decay time of 2.1 μs. Magnetic field application at T = 1.5 K alters the dominant radiative deactivation process from a forbidden to a significantly allowed process. The magnetic field-induced change of the emission decay rate can be described by a first-order perturbation approach.
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