a College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; b Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China
Abstract A series of K3Gd1-x-y(PO4)2:xCe3+, yTb3+ phosphors are synthesized by the solid-sate reaction method. X-ray diffraction and photoluminescence spectra are utilized to characterize the structures and luminescence properties of the as-synthesized phosphors. Co-doping of Ce3+ enhances the emission intensity of Tb3+ greatly through an efficient energy transfer process from Ce3+ to Tb3+. The energy transfer is confirmed by photoluminescence spectra and decay time curves analysis. The efficiency and mechanism of energy transfer are investigated carefully. Moreover, due to the non-concentration quenching property of K3Tb(PO4)2, the photoluminescence spectra of K3Tb1-x(PO4)2:xCe3+ are studied and the results show that when x=0.11 the strongest Tb3+ green emission can be realized.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11204113, 61265004, and 51272097), the Foundation of Application Research of Yunnan Province, China (Grant No. 2011FB022), the Chinese Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20115314120001), the Postdoctoral Science Foundation of China (Grant No. 2011M501424), and the National Basic Research Program of China (Grant No. 2011CB211708).
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