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Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method |
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| Authors: | Jun Ho Chung Sang Yeop Lee Kwang Bo Shim Soon-Yong Kweon Soon-Chul Ur Jeong Ho Ryu |
| Institution: | 1. Department of Materials Science and Engineering, Hanyang University, Seoul, 133-791, South Korea 2. Department of Materials Science and Engineering, Korea National University of Transportation, Chungbuk, 380-702, Korea |
| Abstract: | Li+/Tm3+/Yb3+ co-doped CaMoO4 upconversion (UC) phosphor was prepared by complex citrate-gel method and UC luminescence properties were investigated. Li+/Tm3+/Yb3+ co-doped CaMoO4 has intense blue emission induced by 1G4??3H6 transition at 476?nm that is improved 10 times more than that of Li+ undoped sample and weak red emission at 647 nm generated by 3F2??3H6 transition under excitation at 980?nm. The optimum doping concentration of Li+ ions was investigated and UC mechanism of Li+/Tm3+/Yb3+ co-doped CaMoO4 was discussed in detail. |
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