Microstructure and optical properties of nanocrystalline CaWO4 thin films deposited by pulsed laser ablation in room temperature

被引：0
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作者：
Ryu, Jeong Ho [1 ,2 ]
Bang, Sin Young [2 ]
Kim, Woo Sik [2 ]
Park, Gyeong Seon [2 ]
Kim, Kang Min [2 ]
Yoon, Jong-Won [2 ]
Shim, Kwang Bo [2 ]
Koshizaki, Naoto [3 ]
机构：
[1] Electro Materials and Device Laboratory, Cooperate R and D Institute, Samsung Electro-Mechanics Co., Ltd., 314, Maetan3-Dong, Yeongtong-Gu, Suwon City, Gyunggi-Do 443-743, Korea, Republic of
[2] Department of Ceramic Engineering, Ceramic Processing Research Center (CPRC), Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul, 133-791, Korea, Republic of
[3] Nanoarchitectonics Research Center (NARC), National Institute of Advanced Industrial Science and Technology (AIST), Central 5 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
来源：
Journal of Alloys and Compounds | 2007年 / 441卷 / 1-2期
关键词：
Nanocrystalline CaWO4 films were successfully deposited by pulsed laser ablation at various background Ar gas pressures (10-100 Pa) without substrate heating or after annealing treatment. The effects of Ar pressure on microstructure; surface morphology; chemical composition and optical properties were investigated by XRD; HR-TEM; FE-SEM; XPS; UV-vis and PL analyses. The crystallite size of CaWO4 films increased with increasing Ar pressure; which was associated with a change of surface morphology. Reduced tungsten states [W5+] or [W4+] caused by oxygen vacancies were observed at 10 Pa. However; over; 50; Pa; the atomic concentration of all the constituent elements was almost constant; especially; Ca]/[W; ratio; which was nearly unity. The optical energy band-gap of CaWO4 films was strongly dependent on the Ar pressure; i.e; decreased from 4.9 to 4.5 eV with the increase of Ar pressure from 50 to 100 Pa. The photoluminescence (PL) spectra was positioned in a blue-shifted region around 378 nm compared with emission at 420 nm of bulk CaWO4 target; which clearly demonstrates the optical band-gap widening phenomena induced by quantum-size effect. © 2006 Elsevier B.V. All rights reserved;
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页码：146 / 151
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