Abstract
The liquid-helium-temperature luminescence and absorption spectra of Cs2NaTmBr6 together with the luminescence spectra of Cs2NaHoBr6:TmBr3– 6 and Cs2NaYBr6:TmBr3– 6 have enabled all of the crystal-field energy levels of Tm3+ in TmBr3– 6 below and including the 1G4 term to be located.

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