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| Judd-Ofelt Analysis and Near Infrared Emissions of Nd3+ Doped
Oxyfluoride Glass |
| FENG Li, YU Yi-huan, DU Hong-li, LIU Chao, CHEN Sai, YANG Chun-cheng |
| School of Gemmology and Materials Science, Hebei Key Laboratory of Green Development of Rock Mineral Materials, Engineering Research Center for Silicate Solid Waste Resource Utilization of Hebei Province, Hebei GEO University, Shijiazhuang 050031, China |
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Abstract The high-temperature melt quenching method was used to develop Nd3+ doped SiO2-BaF2-ZnF2 oxyfluoride glasses. Unlike many literatures that only report the visible absorption of samples, UV-Vis-NIR absorption of the samples was measured in this work. 11 absorption bands were obtained, attributed to transitions of Nd3+ from the ground state 4I9/2 to the excited states4I15/2, 4F3/2, 4F5/2+2H9/2, 4F7/2+4S3/2, 4F9/2, 2H11/2, 4G5/2+2G7/2, 4G7/2+2K13/2+4G9/2, 2G9/2+2D3/2+4G11/2+2K15/2, 2P1/2+2D5/2, 2P3/2+4D5/2+2D3/2. The Judd analyzed absorption spectra—Ofelt theory, and Judd-Ofelt intensity parameters, spectroscopic quality factor, radiative transition probabilities, fluorescence branching ratios, and radiative lifetimes were obtained.It should be noted that this article presents the radiative transition probabilities, fluorescence branching ratios, and radiative lifetimes of all transitions from the upper to the lower energy level of 11 absorption bands, which is seldom reported in other literature. Near infrared emissions properties of glasses were also investigated, and both SBZ(20) and SBZ(30) exhibit near infrared emissions at 898, 1 059 and 1 328 nm, with the emission at 1 059 nm being significantly stronger than the other two. The values of Δλeff of emissions at 1 059 nm for the two samples are the smallest, while the values of σemi, σemi×Δλeff and σemi×τrad are the largest. The values are: SBZ(20): 36.22 nm, 2.93×10-20 cm2, 10.63×10-26 cm3, 7.42×10-24 cm2·s; SBZ(30): 35.42 nm, 2.70×10-20 cm2, 9.58×10-26 cm3, 7.84×10-24 cm2·s, which indicate that both samples are potential for laser output.
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Received: 2024-11-07
Accepted: 2025-04-16
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