Abstract
In order to study the spectroscopic properties of vacancies and trap levels in Lu 3Al 5O 12:Ce 3+ (LuAG:Ce 3+) crystal, the <111>-oriented LuAG:Ce 3+ crystal grown in pure nitrogen atmosphere by Czochralski method was annealed in oxidizing atmosphere (air) and reducing atmosphere (H 2+N 2), respectively. The excitation and emission spectra of LuAG:Ce 3+ crystal after different thermal annealing treatments were measured in the temperature range of 8−450 K, and the thermally stimulated luminescence curves of LuAG:Ce 3+ crystal were characterized. It is found that the oxygen vacancies in LuAG:Ce 3+ crystal are effectively eliminated through the annealing treatment in air and four trap levels are observed in as-grown LuAG:Ce 3+ crystal with temperature position peaking at 110, 210, 325 and 475 °C, respectively.
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