Abstract
Fast (τ∼1.7 ns) broadband (fullwidth at half-maximum = 1.1 eV) vacuumultraviolet (VUV; hν = 8.4 eV)luminescence from MgF2 crystals has been detected at low temperature(T<80 K) and analyzed with techniques of cathodoluminescence and time-resolved VUV spectroscopyusing synchrotron radiation. The VUV emission discovered has been attributed to theluminescence of spin-singlet self-trapped excitons (STEs). In contrast to the case for alkalineearth fluoride crystals with fluorite structure, the luminescence of the singlet STEs inMgF2 shows smaller Stokes shift than that of the triplet STEs, which is similar to ‘typical’behavior observed for alkali halide crystals.
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