Spectroscopy and crystal-field analysis for Cr(IV) in alumino-silicate glasses

Feng, Xian and Tanabe, Setsuhisa (2002) Spectroscopy and crystal-field analysis for Cr(IV) in alumino-silicate glasses. Optical Materials, 20 (1), 63-72. (doi:10.1016/S0925-3467(02)00048-4).

Abstract

Racah parameters of Cr⁴⁺ ions in alumino-silicate glasses have been calculated, indicating most Cr⁴⁺ ions are located at low-field sites. Using three-peak Gauss fitting for the luminescence lineshape of Cr⁴⁺:alumino-silicate glass at low temperatures, the existence of Cr⁴⁺ at high-field sites has been demonstrated for the first time in the alumino-silicate glass. The temperature dependence of the emission of low-Cr₂O₃ glass shows blue shift because most of the Cr⁴⁺ ions are in the low-field sites; in which the Cr⁴⁺ ions show the large difference of the thermal population at different excited states due to the non-radiative processes. On the other hand, the concentration dependence of the emission of Cr⁴⁺ ions in alumino-silicate glass shows red shift, caused by the energy transfer between Cr⁴⁺ ions in different crystal-field sites, and subsequently the mechanism of energy transfer between Cr⁴⁺ ions at low-field sites and at high-field sites has been proposed.

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