Abstract

The influences of temperature (2≤ T≤295 K) and homogeneous magnetic fields (0≤ H≤6 T) on the optical absorption and emission spectra of single-crystal [Pt(thq) 2] are reported. Analysis of the spectra shows that the emission at low temperatures originates predominantly from several types of traps located energetically below the lowest triplet exciton band. When a magnetic field is raised from H=0 to 6 T, beside the zero-field emission line of each trap an additional line appears, which is red-shifted by Δ ▪≈5 cm −1. This result is explained by a magnetic-field-induced mixing of the two lowest excited triplet components of each trap.

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