Abstract
The temperature dependence of the luminescence quantum yield of powdered titaniumdioxide in vacuum, nitrogen, and water vapor, respectively, was measured in the temperature range 300 K to 800 K. The observed luminescence is attributed to luminescence from surface states. We find that the luminescence is thermally quenched, as predicted by a simple model. Furthermore, the luminescence is shifted towards shorter wavelengths with increasing temperature. We also observed that the luminescence in vacuum is weakly quenched in the presence of nitrogen or water vapor.
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