Abstract
This paper reports on the luminescence spectrum, its excitation-wavelength dependence and decaytime of Cr3+:LiF crystals. In contrast to Al2O3 and MgO, where the Cr3+ luminescence at low temperature is due to the R-line and its vibronic sideband, luminescence from Cr3+:LiF is assigned to the broad-band 4T2→4A2 transition. A periodic structure in the vibronic sidebands of this transition occurs with energy separations of ca. 60 meV. The linear polarisation of the vibronic sidebands shows that their radiative transition takes place from the lowest excited level of the 4T2 state, i.e. 4B1, into the 4A2 ground state of Cr3+ ions in orthorhombic symmetry sites. The crystal-field parameters calculated from the experimental data, and luminescence decay-time of the two polarized configurations of the 4B1(4T2)→4A2 transition are also reported.
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