High-pressure luminescence of Cr3+-doped CaO-Ga2O3-GeO2 glasses -: art. no. 064203

We present ambient-pressure luminescence, luminescence excitation spectra, and luminescence decays and high-pressure luminescence of chromium doped CaO-Ga2O3-GeO2 glass material. The material has been found to be very inhomogeneous with emission of Cr3+ ions that are in different coordinated environments. Although the broadband emission dominates the overall emission of Cr3+ at ambient pressure, the high-pressure results indicate that the Cr3+ luminescence mainly originates from the high-field Cr3+ sites and is characteristic of the R line emission and the inhomogeneously broadened sideband. The physical quantities of crystal-field strength, Racach parameters, and inhomogeneous crystal-field distribution function have been estimated in the context of a standard configurational coordinate model.