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Enhanced green upconversion luminescence properties of Er3+/Yb3+ co-doped strontium gadolinium silicate oxyapatite phosphor |
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| Authors: | G. Seeta Rama Raju E. Pavitra L. Krishna Bharat Gattupalli Manikya Rao Tae-Joon Jeon Yun Suk Huh Young-Kyu Han |
| Affiliation: | 1. Department of Energy and Materials Engineering, Dongguk University‐Seoul, Seoul 04620, Republic of Korea;2. WCSL of Integrated Human Airway-on-a-Chip,Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea;3. Center of Biomedical Engineering, Institute of Molecular Medicine, Sechenov University, Moscow 119991, Russia;4. Department of Physics, Chundi Ranganayakulu College, Chilakaluripet, Andhra Pradesh 522616, India |
| Abstract: | Upconversion Sr2(Gd.98-xEr.02Ybx)8Si6O26 (SGSO:2Er3+/xYb3+) phosphor materials were synthesized using a citrate sol-gel process. X-ray diffraction patterns confirmed their hexagonal structure. Field emission scanning electron microscopy images of SGSO:2Er3+/xYb3+ phosphors depicted submicron particles. The enhanced upconversion luminescence properties of SGSO:2Er3+/xYb3+ phosphors were analysed as a function of Yb3+ ion concentration and laser power. The energy transfer induced enhanced emission of the Er3+/ Yb3+ ions co-doped SGSO phosphors was ascribed to multi-phonon relaxation. The calculated chromaticity coordinates of the SGSO:2Er3+/xYb3+ phosphors showed emissions could be tuned by changing Yb3+ ion concentration. Optimized sample exhibited the chromaticity coordinate values near to the ultra-high definition television standard green emission coordinates. |
| Keywords: | Sol-gel process Submicron particle Upconversion luminescence Energy transfer Green emission |
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