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Your search keyword '"Liang, Haozhang"' showing total 173 results
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173 results on '"Liang, Haozhang"'

24. Effect of Zn/Si ratio on conversion luminescent properties of Er3+/Yb3+ co-doped oxyfluoride glasses used for solar cells.

Author

Zhou, Ziyou, Luo, Zhiwei, Tong, Juxia, Liang, Haozhang, and Lu, Anxian

Subjects
YTTERBIUM, SOLAR cells, LASER pumping, DOPING agents (Chemistry), FOURIER transform infrared spectroscopy, FLUORESCENCE spectroscopy
Abstract

Er3+/Yb3+ co-doped Na2O–CaF2–ZnO–Al2O3–SiO2 glasses with different Zn/Si ratios were prepared using the melt-quenching technique. The thermal stability was investigated by differential scanning calorimetry. Additionally, the absorption spectra were also analyzed to gather more information about their properties. The down-conversion luminescence corresponding to the strongest fluorescence at a wavelength of 547 nm was obtained under the 378 nm excitation, and a 4S3/2 level fluorescence lifetime was studied. By utilizing a laser pump with a wavelength of 980 nm, the process of both up-conversion and down-conversion luminescence was accomplished. In particular, the glasses substantially enhance fluorescence properties when the Zn/Si ratio is about 0.16. The changes in the Zn/Si ratio lead to modifications in the glass network structure, changing the coordination field environment around the fluorescence center and ultimately impacting the luminescence properties of the rare-earth ions. These effects are evidenced through the findings obtained from Fourier transform infrared spectroscopy and fluorescence spectroscopy analysis of the glass material. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Up‐conversion luminescence of Er3+/Yb3+ co‐doped Gd2Te6O15 tellurite glass‐ceramics for optical thermometry.

Author

Liang, Haozhang, Lin, Xiangtao, Ma, Nanshan, He, Longqing, Tong, Juxia, Luo, Zhiwei, Ye, Lingying, and Lu, Anxian

Subjects
*ENERGY levels (Quantum mechanics), *CRYSTALLIZATION kinetics, *OPTICAL properties, *THERMOMETRY, *LUMINESCENCE
Abstract

The Er3+/Yb3+ co‐doped tellurite glasses and glass‐ceramics (GCs) containing the Gd2Te6O15 phase were successfully fabricated via the conventional melting‐quenching technique followed by a crystallization regime. The Er3+/Yb3+ co‐doped tellurite glasses generated intense up‐conversion green (524 and 546 nm) and red (658 nm) emissions when stimulated by a 980 nm laser. The up‐conversion green emission intensity increased by 68 and 46 times with the increase of the Yb3+/Er3+ ratio, and the optimal Yb3+/Er3+ ratio was found to be 8:1. The surface crystallization process of the Gd2Te6O15 GCs was confirmed through analysis of crystallization kinetics and microscopic morphology. The up‐conversion luminescence and lifetime of Er3+ ions were enhanced by the precipitation of low‐phonon‐energy Gd2Te6O15 crystals. The GC sample crystallized at 480°C for 4 h showed the highest luminescence intensity. The optical thermometry properties of Er3+ ions at thermally coupled energy levels (2H11/2/4S3/2→4I15/2) were explored. The Gd2Te6O15 GCs co‐doped with 0.25 mol% Er2O3 and 2.0 mol% Yb2O3 exhibited an excellent temperature relative sensitivity (Sr) of 1.22% K−1 at 293 K and a great repeatability of 98.07%. These results suggest that the Er3+/Yb3+ co‐doped Gd2Te6O15 GCs show promise for optical thermometry. [ABSTRACT FROM AUTHOR]

Published
2024
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