Up-conversion luminescence and optical thermometry properties of transparent glass ceramics containing CaF2:Yb3+/Er3+ nanocrystals |
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| Affiliation: | 1. Department of Physics, University of the Free State, Box 339, Bloemfontein 9300, South Africa;2. Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India;1. Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China;2. Department of Physics, University of Science and Technology of China, Hefei, 230026, China;3. Key Laboratory of Advanced Materials of Yunnan Province, 304 Xuefu Road, Kunming, 650093, China;1. Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China, No. 96 Jinzhai Road, Hefei, Anhui Province, 230026, PR China;2. Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China;1. Nanomaterials Research Group, Dipartimento di Biotecnologie, Università di Verona, INSTM, UdR Verona, Strada Le Grazie 15, 37314, Verona, Italy;2. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca'' Foscari Venezia, Via Torino 155, 30170, Venezia Mestre, Italy;3. BioNanoPlasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, Donostia San Sebastián, Spain;4. Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, Université du Québec, Varennes, Québec, J3X 1S2, Canada;5. Centre for Self-Assembled Chemical Structures, McGill University, Montréal, Québec, H3A 2K6, Canada |
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| Abstract: | A series of Yb3+/Er3+ codoped transparent oxyfluoride glass ceramics with various amounts of Yb3+ have been successfully fabricated and characterized. Under 980 nm laser prompting, the samples produce intense red, green and blue up-conversion emissions, and the emission intensities increase with Yb3+ concentration and heat treatment temperature. Before losing good transparency in the visible region, optimum emission intensities are obtained for the sample with 25 mol% of Yb3+ at a heat treatment temperature of 680 °C. A possible up-conversion mechanism is proposed from the dependence of emission intensities on pumping power. The fluorescence intensity ratio between the two thermally coupled levels 2H11/2 versus 4S3/2 was measured with the laser output power of 57 mW to avoid the possible laser induced heating effect. The fluorescence intensity ratio values in the temperature range from 295 K to 723 K can be well fitted with the equation: A exp (−∆E/kBT), where A = 6.79 and ∆E=876 cm−1. The relative temperature sensitivity at 300 K was evaluated to be 1.4% K−1. All the results suggest that the Yb3+/Er3+ codoped CaF2 glass ceramics is an efficient up-conversion material with potential in optical fiber temperature sensing. |
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| Keywords: | Energy transfer process Power dependence Tunable emission Optical thermometry |
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