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Room-temperature photoluminescence (PL) spectra of nondoped, La-doped (0.1, 0.5, and ), and -irradiated STO single crystals. The inset shows doping concentration dependence of the integrated PL intensity of the La-(filled rectangle) and Nb-(opened rectangle) doped STO crystals. The solid line is guide for the eyes.
Temperature dependence of photoluminescence spectra of doped STO single crystal from .
Structural phase transition temperature of La-doped STO as a function of La concentration. The inset shows the temperature dependence of the specific heat of nondoped and doped STO single crystals.
Photoluminescence spectra of La-0.1 and single crystals near the structural phase transition temperatures ().
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