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Abstract
Nanocrystalline CaWO4 films were synthesized by pulsed laser deposition at various Ar gas pressures without substrate heating or postannealing treatment. Crystallinity, chemical composition, absorbance, optical energy band gap, and photoluminescence (PL) of the CaWO4 films were found to be strongly dependent on the Ar pressure. The optical energy band gap was in a range of 4.9–4.5eV and PL peak position in the spectra was positioned in a blueshifted region around 3.29eV at room temperature. Compared with emission at around 2.95eV of bulk CaWO4 targets under the same excitation conditions, our results clearly demonstrate the blueshift of PL emission induced by the quantum-size effect.
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