Temperature-dependent luminescence spectra of [ReCl6]2− doped in K2PtCl6-type crystals

Abstract Luminescence spectra of [ReCl 6 ] 2− doped in various cubic Rb 2 MCl 6 (M = Te, Sn) host crystals have been measured at temperatures between 20 and 240 K. Excitation was obtained at different energy using various laser lines. The intensities of vibronic fundamentals belonging to the Γ 7 ( 2 T 2g ) → Γ 8 ( 4 A 2g ) transition are compared to theoretical models which describe temperature-dependent transition rates giving rise to vibronic sidebands.