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361 results on '"Zhu, Zhaojie"'

17. The bulk crystal growth and yellow–orange spectral performances of Pr3+: BaF2 and Pr3+/RE3+(RE3+ = Gd3+, Y3+, Lu3+, Ce3+): BaF2 crystals.

Author

Le, Xuxing, Zheng, Longxing, Wang, Yan, Zhu, Zhaojie, Li, Jianfu, Wang, Hongyan, Lakshminarayana, G., and Tu, Chaoyang

Subjects
CRYSTAL growth, CRYSTALS, ACTIVE medium, REMOTE sensing, DOPING agents (Chemistry), LUTETIUM compounds
Abstract

In this study, we synthesized Pr3+:BaF2 and Pr3+/RE3+ (RE = Gd, Y, Lu, Ce) co-doped BaF2 crystals, exploring their novel spectral properties through co-doping with Gd, Y, Lu, and Ce ions. The research demonstrates that both singly doped and co-doped BaF2 crystals have broader full width at half maximum (FWHM) values (24.82 nm) and longer fluorescence lifetimes (244 µs) than typical Pr3+-doped crystals, indicating their potential as gain media for Pr3+-based yellow–orange lasers. Notably, co-doping with Gd3+ enhances yellow–orange light emission up to 12 times, Y3+ up to 8 times, and Lu3+ up to 9 times. The effect is more pronounced with increased concentrations of co-dopants, while Ce3+ doping mainly expands the FWHM. Low-temperature spectral analysis confirms that co-doping alters the spectral performance by disrupting symmetric clusters in Pr: BaF2 crystals, forming new clusters with lower symmetry, and enhancing lattice distortion, thus increasing the absorption cross-section to 1.69 × 10−20 cm². Our findings highlight the significant potential of these crystals in biomedical, spectroscopic, information processing, atmospheric detection, and remote sensing applications. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Optimizing yellow fluorescence in Dy3+:SrF2 crystal through Gd3+ co-doping.

Author

Wang, Haidong, Gao, Xiangqi, Wang, Yan, Zhu, Zhaojie, You, Zhenyu, Li, Jianfu, Lakshminarayana, G., and Tu, Chaoyang

Abstract

A high-quality Dy3+/Gd3+: SrF2 single crystal has been grown successfully by the Bridgman method. The spectroscopic properties of the crystal have been analyzed in detail following the absorption, emission, and decay time measurements. In the Dy, Gd: SrF2 crystal, the absorption cross-section (0.83 × 10−21 cm2) at 452 nm and the emission cross-section (0.90 × 10−21 cm2) at 572 nm of Dy3+ ion are enhanced by nearly 1.5 and 3.8 times respectively, compared to Dy: SrF2 crystal. There observed a resonant energy transfer between Gd3+ and Dy3+ ions, and the yellow emission of Dy3+ ions with a peak at 572 nm was identified under 274 nm excitation. The Gd3+ ion can sensitize the emission of Dy3+ ion in the yellow region under ultraviolet (UV) light excitation. Obtained results imply that Dy, Gd: SrF2 crystal can be a potential candidate for an all-solid-state yellow laser pumped by a blue InGaN laser diode or UV laser. [ABSTRACT FROM AUTHOR]

Published
2023
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