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36. Na5Y9F32:Yb3+/Ho3+/Tm3+up-conversion luminescent single crystals for highly sensitive optical temperature sensor

Author

Wei, Di, Fang, Lizhi, Xia, Haiping, Chen, Xu, Song, Hongwei, and Chen, Baojiu

Abstract

•A series of Ho3+/Tm3+/Yb3+triply doped Na5Y9F32single crystals are grown.•The Srhighly reached 1.97% K−1and δTlowly 0.017 K of the single crystal.•The effect Yb3+content on the UC emission of the crystal was investigated.•The energy transfer processing was well studied by the steady-state rate equation.

Published
2024
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38. Tunable luminescence in transparent oxyfluoride glass–ceramics containing KY3F10: Mn2+/Eu3+ nanocrystals for highly sensitive temperature sensing.

Author

Ying, Junyi, Fang, Lizhi, Zhou, Xiong, Xia, Haiping, Song, Hongwei, and Chen, Baojiu

Abstract

Transparent glass–ceramics (GCs) encompassing Mn2+/Eu3+-doped KY3F10 (Mn2+/Eu3+: KY3F10) nanocrystals were fabricated successfully using the traditional method of melt-quenching. The Mn2+ and Eu3+ ions were confirmed incorporated in the lattices of Y3+ in KY3F10 nanocrystals determining from the results of change of emission intensity of Eu3+ and Mn2+, EDS, and TEM before and after micro-crystallization of glass. When Mn2+ was fixed at 0.5 mol% in concentration and Eu3+ was changed from 0 to 0.9 mol%, the emission color of the GCs was varied from green to yellow–orange and the average lifetime of Mn2+ ion was reduced from 8.61 to 7.38 ms. As Eu3+ concentration increases, the efficiency of energy transfer from the excited states of Mn2+ ions to Eu3+ ions rises, resulting in enhanced Eu3+ emission and diminished Mn2+ emission, thereby causing a change in emission color and a reduction in the lifetime of Mn2+ ions. An absolute sensitivity (Sa) reaching up to 0.25% K−1 at 298 K and a relative sensitivity (Sr) of 0.62% K−1 at 298 K were derived by analyzing the fluorescence intensity ratio (FIR) between 540 nm of Mn2+ and 613 nm of Eu3+ ions. The transparent GCs with physico-chemical stability and good luminous efficiency have application prospects for multicolor display applications and temperature sensors. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Enhanced Red Emission of Na5Lu9F32: Eu3+ Single Crystal by Introducing of GdF3.

Author

Zou, Zhengjuan, Fang, Lizhi, Zhou, Xiong, Xia, Haiping, Song, Hongwei, and Chen, Baojiu

Subjects
SINGLE crystals, OPTICAL detectors, RADIATIONLESS transitions, OPTICAL devices, X-ray diffraction measurement
Abstract

The bulk Na5Lu9F32 single crystals with high quality serial Eu3+/Gd3+ co‐doped were grown by an ameliorative Bridgman technique. The measurement of X‐ray diffraction (XRD) and analysis of Rietveld refinement were implemented to validate the crystal phase. The Eu3+ doped Na5Lu9F32 single crystal emits intense red emission at 611 nm excited by 394 nm light. The intensity of 1.8 mol % Gd3+ doped sample is boosted by 3.56 times compared with the un‐doped one. The doping of Gd3+ ions replace competitively Lu3+ lattice sites with Eu3+ ions. Thus, they cause the lattice distortion and reduction of symmetry, enabling Eu3+ ions to overcome their 4f forbidden transitions. The change of Eu3+ ion local environment induced by Gd3+ ion doping was explored by the Eu3+ emission spectra and the variations of ratios between red and orange emission intensities (R/O). The fluorescence lifetime indicates that the introduction of GdF3 decreases the probability of non‐radiative transitions and increases the fluorescence lifetime. These results demonstrated that the Na5Lu9F32: Eu3+ single crystal doped with an appropriate concentration of GdF3 is a type of promising red emission single crystal for related optical devices of detector and laser due to its strong red emission, high transparency and high physico‐chemical stability. [ABSTRACT FROM AUTHOR]

Published
2024
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