Energy transfer,tunable emission and optical thermometry in Tb3+/Eu3+ co-doped transparent NaCaPO4 glass ceramics |
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| Affiliation: | 1. Departamento de Física Fundamental y Experimental, Electrónica y Sistemas, Universidad de La Laguna, Av. Astrofísico Francisco Sánchez, s/n, E-38206 La Laguna, Tenerife, Spain;2. MALTA Consolider Team, Instituto de Materiales y Nanotecnología (IMN), Universidad de La Laguna, Av. Astrofísico Francisco Sánchez, s/n, E-38206 La Laguna, Tenerife, Spain;3. Department of Physics, SriVenkateswara University, Tirupati 517502, India;1. Condensed Mater Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, China;2. Laboratory of Sono- and Photo-Theranostic Technologies, Harbin Institute of Technology, Harbin 150001, China;3. Department of Mathematics and Materials Research Institute, The Pennsylvania State University, PA 16802, USA;1. College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, People''s Republic of China;2. Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province Nanjing, 210023 Jiangsu, People''s Republic of China;3. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210046, People''s Republic of China |
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| Abstract: | Tb3+/Eu3+ co-doped glass ceramics containing NaCaPO4 nanocrystals were successfully synthesized via traditional melt-quenching route with further heat-treatment and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence spectroscopy. The energy transfer process of Tb3+→Eu3+ was confirmed by excitation and emission spectra and luminescence decay curves, and the energy transfer efficiency was also estimated. The results indicated that the efficient emission of Eu3+ was sensitized by Tb3+ under the excitation of 378 nm, realizing tunable emission in the transparent bulk glass ceramics containing NaCaPO4 nanocrystals. Furthermore, optical thermometry was achieved by the fluorescence intensity ratio between Tb3+:5D4→7F5 (~542 nm) and Eu3+:5D0→7F2 (~612 nm). The maximum absolute sensitivity of 4.55% K?1 at 293 K and the maximal relative sensitivity of 0.66% K?1 at T=573 K for Tb3+/Eu3+ co-doped transparent NaCaPO4 glass ceramic are obtained. It is expected that the investigated transparent NaCaPO4 glass ceramics doped with Tb3+/Eu3+ have prospective applications in display technology and optical thermometry. |
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| Keywords: | Glass-ceramic nanocrystals Energy transfer process Tunable emission Optical thermometry |
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