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361 results on '"Zhu, Zhaojie"'

101. Influence of codoped Gd3+ ions on the spectroscopic site symmetry of Dy3+ ions in LaF3 single crystals.

Author

Hu, Mingyuan, Wang, Yan, You, Zhenyu, Zhu, Zhaojie, Li, Jianfu, Cai, Xiuyuan, and Tu, Chaoyang

Abstract

In this paper, a series of Dy3+/Gd3+ codoped LaF3 (LDG) single crystals were grown by the Bridgman–Stockbarger method. The influence of non-optically-active Gd3+ ions on the luminescence of Dy3+ ions in LaF3 crystals has been explored. Dy3+/Gd3+ ions substitute for the La lattice in LaF3, and the local site symmetry of each subset of Dy3+ will be distorted from C2 to lower symmetry C1. Based on the measured low temperature excitation and emission spectra, it can be proved that Dy3+ ions occupy the same kind of spectroscopic site in Dy3+/Gd3+ codoped LaF3 crystals, and codoped Gd3+ ions do not change the spectroscopic site symmetry of Dy3+. When Gd3+ ions were codoped into the Dy3+:LaF3 crystal, Dy–Gd clusters were formed around single Dy3+ ions to isolate Dy3+ ions from each other and weakened the concentration quenching effect of Dy3+ ions. When 2 at% Dy3+ and 1 at% Gd3+ ions were doped into the LaF3 crystal, the strongest yellow luminescence was obtained under excitation at 349 nm and 453.75 nm, respectively. While doped with 2 at% Dy3+ and 2 at% Gd3+ ions, the LDG crystal exhibited the strongest mid-infrared fluorescence emission intensity. This concludes that the LDG crystals are suitable for achieving a yellow laser (4F9/2 → 6H13/2 transition) pumped using a InGaN blue laser diode (LD) and a mid-infrared laser (6H13/2 → 6H15/2 transition) pumped using a 1280 nm LD. [ABSTRACT FROM AUTHOR]

Published
2019
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106. Crystal growth, structure and characterization of Er6B4O15 as self‐activated eye‐safe laser material within the near‐infrared waveband.

Author

Wang, Yan, Zhang, Wei, Li, Ziyi, Li, Jianfu, Zhu, Zhaojie, You, Zhenyu, and Tu, Chaoyang

Subjects
CRYSTAL structure, INFRARED radiation
Abstract

A new rare‐earth borate Er6B4O15 was synthesized by a solid‐state reaction technique. The crystal was obtained by a flux method. Single‐crystal X‐ray diffraction analysis revealed that the crystal structure is composed of ErO6 polyhedra sharing edges and BO3 groups. The absorption, near‐infrared fluorescence spectra and the fluorescence decay curve of Er: 4I13/2 energy level in the Er6B4O15 crystal were measured at room temperature. The absorption peak was located at 977 nm with absorption cross section of 1.16 × 10−21 cm2 and a full width at half‐maximum (FWHM) of 16 nm, which is very suitable for commercial 980 nm laser diode pumping. A maximum emission peak at 1560 mm with a broad FWHM of 64 nm was observed in this crystal because of the Er3+ transition 4I13/2→4I15/2, while the emission cross section was calculated to be 8.53 × 10−20 cm2. These results imply that the Er6B4O15 crystal is a promising candidate material for the achievement of an eye‐safe near‐infrared wavelength laser. [ABSTRACT FROM AUTHOR]

Published
2018
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119. Bulk Crystal Growth, First-Principles Calculations, and Mid-Infrared Spectral Properties of Dy3+Doped and Dy3+/Nd3+Codoped LaF3Single Crystals

Author

Hu, Mingyuan, Zhu, Zhaojie, Wang, Yan, Li, Jianfu, You, Zhenyu, and Tu, Chaoyang

Abstract

Dy3+doped and Dy3+/Nd3+codoped LaF3single crystals were successfully grown by the Bridgman-Stockbarger method in a self-made medium frequency furnace. The crystal structures of LaF3were investigated, and their geometry optimizations were carried out. The electronic structures including band structure and density of state were calculated by using first-principles calculations based on density functional theory. The polarized absorption and emission spectra including near-infrared and mid-infrared fluorescence spectra were measured at room temperature. The energy transfer mechanism from Nd3+ion to Dy3+ion was presented, and the microscopic transfer parameters were calculated based on the phonon-assisted energy transfer theory. In summary, two promising routes of Dy3+/LaF3crystal pumped by 1280 nm LD and Dy3+/Nd3+/LaF3crystal pumped by 790 nm LD were proposed for a mid-infrared laser.

Published
2018
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140. Spectroscopic properties of Pr3+:SrMoO4 crystal

Author

Cao, Jiafeng, primary, Wang, Yan, additional, Ma, Xinghua, additional, Li, Jianfu, additional, Zhu, Zhaojie, additional, You, Zhenyu, additional, Yang, Fugui, additional, Sun, Chengli, additional, Cao, Ting, additional, Ji, Yuexia, additional, and Tu, Chaoyang, additional

Published
2011
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