Synthesis,photoluminescence and thermoluminescence properties of LiNa3P2O7:Tb3+ green emitting phosphor |
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| Affiliation: | 1. Department of Physics, Sri Venkateswara University, Tirupati 517502, India;2. School of Mechanical Engineering and Technology, Yeungnam University, Gyeongsan 712-749, South Korea;3. Department of Future Studies, Sri Venkateswara University, Tirupati 517502, India;4. School of Physical Sciences, Reva University, Bangalore 560 064, India;1. College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China;2. Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining 810008, Qinghai, PR China;1. Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;2. Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan;3. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan;1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, PR China;2. Department of Physics and Center for Marine-Integrated Biomedical Technology, Pukyong National University, Busan 608-737, Republic of Korea |
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| Abstract: | The alkaline phosphate based LiNa3P2O7:Tb3+ phosphors are prepared by solid state reaction method. X-ray diffraction (XRD) analysis shows that all the powders possess orthorhombic structure. Fourier transform infrared (FTIR) spectroscopy studies suggest that the phosphor belong to the diphosphate family. The morphology of the phosphors is identified by scanning electron microscopy (SEM). Upon 378 nm excitation, the LiNa3P2O7:Tb3+ phosphors shown emission bands at 482, 545, 588 and 620 nm corresponding to the transitions 5D4→7F6, 5D4→7F5, 5D4→7F4 and 5D4→7F3, respectively. The optimized concentration of Tb3+ in LiNa3P2O7 phosphor is found to be 9 mol%. The concentration quenching mechanism was proved to be the exchange interaction between two nearest Tb3+ ions with the critical distance (Rc) of 1.18 nm. The Commission International de l'Eclairage (CIE) coordinates evidence that the phosphors emit in the green light region. Thermoluminescence properties of the prepared phosphors are studied by pre-irradiating the powders with different doses of UV irradiation. The kinetic parameters of TL glow curves are calculated using Chen's peak shape method. |
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| Keywords: | Alloys Chemical synthesis X-ray diffraction Microstructure Luminescence |
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