Optical transition and luminescence properties of Sm3+-doped YNbO4 powder phosphors |
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Authors: | Xin Wang Xiangping Li Rensheng Shen Sai Xu Xizhen Zhang Lihong Cheng Jiashi Sun Jinsu Zhang Baojiu Chen |
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Affiliation: | 1. School of Science, Dalian Maritime University, Dalian, Liaoning, PR China;2. School of Microelectronics, Dalian University of Technology, Dalian, Liaoning, PR China |
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Abstract: | A series of YNbO4: Sm3+ powder phosphors with different doping concentrations were synthesized by a traditional high-temperature solid-state reaction method. The crystal structure of the obtained samples was characterized by means of X-ray diffraction. Concentration quenching, energy-transfer mechanism, and luminescence thermal stability of YNbO4: Sm3+ samples were studied through the fluorescence spectra and decays. It was concluded that electric dipole-dipole interaction was the dominant energy-transfer mechanism between Sm3+ ions according to both Van Uitert's model and Dexter's model. Using the Arrhenius model, crossover process was proven to be responsible for the luminescence thermal quenching of Sm3+. Moreover, a novel approach for evaluating the optical transition properties of Sm3+ ion in YNbO4 powders using the diffuse-diffraction spectrum and fluorescence decay was examined in the framework of Judd-Ofelt (J-O) theory. It was confirmed that the J-O parameters Ωλ (λ = 2, 4, 6) of Sm3+ in YNbO4 powder were reliable by comparing the radiation transition rate with the measured emission results. |
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Keywords: | energy transfer J-O parameters luminescence thermal quenching YNbO4: Sm3+ powders |
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