Photoluminescent properties and site occupation preference in Bi3+, Eu3+ doped CaY4(SiO4)3O phosphor |
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| Affiliation: | 1. Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea;2. Department of Physics, Dongeui University, Busan 614-714, Republic of Korea;3. Department of Chemistry and Pharmaceutical Science, Qingdao Agricultural University, Qingdao 266109, People’s Republic of China;1. Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan, ROC;2. Department of Mechanical Engineering, ROC Military Academy, Kaohsiung 807, Taiwan, ROC;3. Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan, ROC;1. Department of Physics, Pukyong National University, Busan 608-737, South Korea;2. Department of Physics, Dongeui University, Busan 614-714, South Korea;1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Hunan Normal University, Changsha 410081, China;2. Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province College, Hunan Normal University, Changsha 410081, China;3. Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China;4. Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), Ningbo, 315201, China;5. School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China;1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;3. Wenzhou Institute of Biomaterial and Engineering, Wenzhou 325027, China;4. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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| Abstract: | Bi3+, Eu3+ doped CaY4(SiO4)3O phosphors were synthesized through high temperature solid state reaction. Their photoluminescent properties were investigated and site occupation preference of Bi3+ in cationic sites was analyzed. The structure of CaY4(SiO4)3O is characterized by three non-equivalent cationic sites with different coordination and cation-oxygen distances. By means of dielectric theory of the chemical bond for complex crystals, several kinds of chemical bond parameters like fractional covalence of CaY4(SiO4)3O were calculated and integrated to yield environmental factor he. According to quantitative equations between the transition energy of Bi3+ and environmental factor he, the excitation bands at 308 and 226 nm were assigned to 1S0→3P1 transition of Bi3+ in Y(6h) and Y(4f) site, respectively. Another excitation band centered at 210 nm should be the overlap of Bi3+ A-band in Ca site and C-band in Y(6h) site. Optical band gap of pure CYSO was calculated using Kubelka–Munk method from diffuse reflectance spectra. Red emission can be realized in CaY4(SiO4)3O:Bi3+, Eu3+ under UV light excitation because of efficient energy transfer from Bi3+ to Eu3+ and decay behaviors of Bi3+ and Eu3+ emission were investigated. Without optimization, the internal quantum efficiency of CYSO:2%Bi3+, 7%Eu3+ at 310 and 393 nm excitations were 31.563%, 74.252%, respectively. |
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| Keywords: | Luminescence Site occupation |
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