Nature of intrinsic and impure luminescence of MAlP2O7 crystals |
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| Authors: | S Nedilko P Nagornii I Nedyelko V Scherbatskii N Stus O Gomenyuk V Sheludko V Boyko R Boyko |
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| Affiliation: | aKyiv National Taras Shevchenko University, 2, Block 1, Acad. Hlushkov Ave., 03680 Kyiv, Ukraine;bGlukhiv Pedagogical University, 24, Kyjevo-Moscovs’ka St., 41400 Glukhiv, Ukraine;cNational Agriculture University, 5, Geroiv Oborony St., 03041 Kyiv, Ukraine |
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| Abstract: | The results of the photoluminescence (PL) investigation of pure and chromium-doped MAlP2O7 (M = Na, K, Cs) compounds are presented. The spectra of the intrinsic luminescence of MAlP2O7 crystals consist of a separated UV band at a peak position near 330 nm and a complex wide band which covers the region of visible light up to 750 nm at excitation by VUV synchrotron radiation. The “red” band in 600–1000 nm diapason appears in the PL spectra of crystals doped with chromium ions. The effect of the temperature on the structure, the peak positions and intensities of the luminescence bands was studied. An assumption about the nature of the intrinsic PL was made. The “red” luminescence was considered as a result of the 4Т2 → 4А2 radiation transitions in the impurity Cr3+ ions located in the intermediate crystal field. |
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| Keywords: | Luminescence Phosphates Excitons F+-centers Chromium ions |
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