Abstract
We find that PL intensity I ( t ) of SrTiO 3 thin film measured under UHV condition increases with UV-laser illumination over long time scale of ∼ 2 h. The intensity increase takes place at lower sample temperature as well, 200, 100 K, and 20 K. When O 2 and N 2 gas are introduced into the sample chamber the PL intensity decreases with the UV-illumination time, opposite to the UHV-case. We consider a quantitative thermal energy flow model of the laser-power and heat absorption by the sample, but find that temperature change of the sample is not large enough to account for the time dependent I ( t ) . We propose photo-catalysis effect on STO surface as possible scenario of the PL intensity change.
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