Upconversion luminescence in Tm3+/Yb3+co-doped lead tungstate tellurite glasses |
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| Authors: | A Mohan Babu BC Jamalaiah T Chengaiah GV Lokeswara Reddy L Rama Moorthy |
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| Institution: | 1. Department of Physics, Sri Venkateswara University, Tirupati 517502, India;2. Department of Physics, Changwon National University, Changwon 641-773, Republic of Korea;1. Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China;2. Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen 361005, China;1. Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China;2. Institute of Photo-Electronic Thin Film Devices and Technology, Tianjin Key Laboratory of Photo-Electronic Thin Film Devices and Technology, Nankai University, Tianjin 300071, China;3. Lab of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;1. Department of Physics & Nanotechnology, SRM Institute of Science & Technology, Kattankulathur, Chennai, 603203, India;2. Nanotechnology Research Center, SRM Institute of Science & Technology, Kattankulathur, Chennai, 603203, India;3. Division of Physics, School of Advanced Sciences, Vellore Institute of Technology, Chennai, 600048, India;1. College of Chemistry and Materials Science, Guangxi Teachers Education University, Nanning 530001, China;2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530001, China |
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| Abstract: | This work reports the upconversion luminescence properties of Tm3+/Yb3+ ions in lead tungstate tellurite (LTT) glasses. Judd–Oflet intensity parameters have been obtained from the absorption band intensities of Tm3+ singly-doped and Tm3+/Yb3+ co-doped LTT glasses. The spontaneous emission probabilities, radiative lifetimes and branching ratios for 1G4 and 3H4 emission levels of Tm3+ have been determined. Upconversion luminescence has been observed by exciting the samples at 980 nm (Yb3+:2F7/2→2F5/2) at room temperature. Four upconversion emission bands corresponding to the 1G4→3H6 (477 nm), 1G4→3F4 (651 nm), 1G4→3H5 (702 nm) and 3H4→3H6 (810 nm) transitions have been identified. The relative variation in the intensities of upconversion bands, the different channels responsible for upconversion spectra and the effect of Yb3+ ions concentration on the upconversion luminescence of Tm3+ ions have also been discussed. |
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