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Room-temperature deposition of nanocrystalline CaWO4 films by pulsed laser and their optical properties

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5 Author(s)
Ryu, Jeong Ho ; Department of Ceramic Engineering, Ceramic Processing Research Center (CPRC), Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul 133-791, South Korea ; Yoon, Jong-Won ; Shim, Kwang Bo ; Sasaki, Takeshi
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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 4.9–4.5 eV and PL peak position in the spectra was positioned in a blueshifted region around 3.29 eV at room temperature. Compared with emission at around 2.95 eV 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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Journal of Applied Physics  (Volume:99 ,  Issue: 8 )