Tune color of single-phase LiGd(MoO4)2-X(WO4)X: Sm3+, Tb3+ via adjusting the proportion of matrix and energy transfer to create white-light phosphor |
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Affiliation: | 1. College of Chemistry, Jilin University, Changchun 130026, PR China;2. Department of Chemistry, Tonghua Normal University, Tonghua 134002, PR China;1. State Key Laboratory Base of Novel Function Materials and Preparation Science, School of Material Sciences and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211, China;2. Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo, Zhejiang, 315211, China;1. Department of Physics, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140407, Punjab, India;2. Department of Physics, Shri Guru Teg Bahadur Khalsa College, Sri Anandpur Sahib 140118, Punjab, India;1. Department of Physics, M S Ramaiah Institute of Technology, (Autonomous, affiliated to VTU), Bengaluru - 560054, India.;2. Department of Mechanical Engineering, M S Ramaiah Institute of Technology, (Autonomous, affiliated to VTU), Bengaluru - 560054, India. |
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Abstract: | A series of LiGd(MO4)2: Sm3+, Tb3+ (M = Mo, W) phosphors was prepared by a conventional solid state reaction method. Powder X-Ray diffraction (XRD) analysis reveals that the compounds are of the same structure type. Their luminescent properties have been studied. The optimal doping concentrations are 8% for Sm3+ and 18% for Tb3+ in the LiGd(MoO4)2 host. Sm3+ and Tb3+ have different sensitivity to the Mo/W ratio. For LiGd(MoO4)2-X(WO4)X: Sm3+ (X = 0, 0.4, 0.8, 1.2, 1.6, 2.0), the strongest emission intensity is 1.766 times than that of the weakest, while 171 times for LiGd(MoO4)2-X(WO4)X: Tb3+. The experimental results show that Mo/W ratio strong influences on the properties of LiGd(MoO4)2-X(WO4)X: Tb3+. With the increasing of WO42− groups concentration, the shape of characteristic excitation peaks of Tb3+ is almost the same and the excitation intensity gradually increase. Moreover, the energy transfer from Tb3+ to Sm3+ has been realized in the co-doped phosphors. The experimental analysis and theoretical calculations reveal that the quadrupole–quadrupole interaction is the dominant mechanism for the Tb3+→Sm3+ energy transfer. Therefore, luminous intensity can be adjusted by different sensitivities to matrix composition and energy transfer from Tb3+→Sm3+. By this tuning color method, white-light-emitting phosphor has been prepared. The excitation wavelength is 378 nm, and this indicates that the white-light-emitting phosphor could be pumped by near-UV light. |
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Keywords: | Tune color Luminescence Energy transfer White-light |
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