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The excitation and emission spectra of NaBr with high thallium content have been examined. The data obtained have revealed that the luminescence behaviour of heavily doped NaBr: Tl phosphor differs markedly from that of the lightly doped one. It has been shown that besides generally accepted isolated substitutional Tl +  ions, the charged complex ions of the type (TlBr  n  ) −  also act as luminescence centres.

Complex ion centres in heavily doped NaBr: Tl phosphors