Comparison of Ce3+ and Pr3+ activators in alkaline-earth fluoride crystals
Abstract
The emission spectra of Ce3+ or Pr3+ doped CaF2, SrF2, BaF2 excited by vacuum ultraviolet photons or by x-ray as well as excitation and absorption spectra in vacuum ultraviolet region (6-13 eV) were studied. The transfer of exciton energy is the main channel for Ce3+ excitation in alkaline-earth fluorides. Three different stages of energy transfer were observed. Pr3+ excited by two processes, slow f-f luminescence excited by excitons, fast d-f luminescence excited by some fast process.
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