Abstract
We report that the blue photoluminescence (PL) dynamics are dependent on both the photogenerated and the chemically doped carrier densities in ${\text{SrTiO}}_{3}$. We found that the PL decay dynamics are well explained using a simple model that includes nonradiative single-carrier trapping, radiative bimolecular recombination, and nonradiative Auger recombination processes. In highly photoexcited ${\text{SrTiO}}_{3}$ and heavily electron-doped ${\text{SrTiO}}_{3}$, the rapid Auger recombination of the polarons determines the PL properties.
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