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aThe bismuth doped aluminosilicate phases leucite (KAlSi 2 O 6 ), gallium leucite (KGaSi 2 O 6 ) and pollucite (CsAlSi 2 O 6 ) display broadband NIR photoluminescence. The active center, responsible for this luminescence, is the Bi + monocation, which substitutes for the large alkali metal cations. The Al,Si-disorder in the aluminosilicate framework of studied crystal phases results in the heterogeneity of Bi + luminescent center population, which manifests itself in the characteristic dependency of the luminescence spectrum shape on the excitation wavelength. The relation of NIR emission in Bi + -doped leucite and pollucite phases to the luminescent properties of bismuth-doped glasses is also discussed.

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