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White-emitting phosphors Ca6La2Na2(PO4)6F2:Dy and luminescence enhancement through Ce → Dy energy transfer
Authors:Mubiao Xie  Songlian Ou  Hongbin Liang  Dejian Hou  Yan Huang  Zhenhua Gao  Ye Tao
Affiliation:1. Institute of Physical Chemistry, School of Chemistry Science & Technology, Zhanjiang Normal University, Zhanjiang 524048, China;2. MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China;3. Beijing Synchrotron Radiation Facilities, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100039, China
Abstract:Ce3+ and Dy3+ activated fluoro-apatite Ca6La2Na2(PO4)6F2 with chemical formulas Ca6La2−xLnxNa2(PO4)6F2 (Ln = Ce3+, Dy3+) were prepared by a solid state reaction technique at high temperature. The vacuum-ultraviolet (VUV) and ultraviolet (UV) spectroscopic properties are investigated. The results indicate that Ce3+ ions show the lowest 5d excitation band at ∼305 nm and a broad emission band centered at ∼345 nm. Dy3+ ions exhibit intense absorption at VUV and UV range. White-emitting under 172 nm excitation is obtained based on two dominant emissions from Dy3+ ions centered at 480 and 577 nm. In addition, the energy transfer from Ce3+ to Dy3+ in the co-doped samples are observed and discussed.
Keywords:Optical materials   Photoluminescence spectroscopy   Luminescence   Optical properties
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