Abstract
Bi4Ge3O12 crystals doped with Mn exhibit a considerable thermally stable photochromic effect. An additional absorption of light appears in the visible region of the optical absorption spectrum of the crystals irradiated with UV light. In the photoluminescence spectrum, both the intrinsic emission of a pure Bi4Ge3O12 crystal and the emission in the region of 580 nm caused by the presence of Mn2+ ions are observed. After UV exposure, the luminescence intensity of Mn-doped Bi4Ge3O12 crystals decreases. The emission associated with by Mn2+ ions disappears. The luminescence intensity of pure Bi4Ge3O12 decreases due to strong photoinduced absorption of light in this spectral region.
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