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We studied photoluminescence (PL) spectrum and dynamics of SrTiO3 nanoparticles. A broad blue PL band is observed at around 2.9 eV in nanoparticle thin films. The excitation-density dependence of the blue PL intensity indicates that nonradiative Auger recombination dominates the carrier recombination process under strong photoexcitation. The intrinsic Auger recombination rate in SrTiO3 nanoparticles is much larger than that of SrTiO3 bulk crystals. The origin of enhanced Auger recombination in SrTiO3 nanoparticles is discussed

Blue photoluminescence and Auger recombination of carriers in SrTiO3 nanoparticles