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Comprehensive property engineering of YGdAP:Ce scintillation crystals by optimizing the Y/Gd ratio.

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Název: Comprehensive property engineering of YGdAP:Ce scintillation crystals by optimizing the Y/Gd ratio.
Autoři: Lixiang Wang, Rui Zheng, Yuxiang Chen, Yulong Liu, Jingbin Chen, Peng Xiao, Junhui Yuan, Jiafu Wang, Qingguo Xie
Zdroj: CrystEngComm; 9/14/2025, Vol. 27 Issue 34, p5702-5713, 12p
Témata: SCINTILLATORS, GAMMA ray detectors, ENERGY transfer, OPTICAL properties, CRYSTAL growth, LUMINESCENCE measurement
Abstrakt: Rare-earth aluminate perovskites have emerged as a promising class of scintillation crystals due to their high density and fast decay time. However, engineering their properties and growing bulk crystals with superior comprehensive performance for γ-ray detection remain a significant challenge. This paper employed a miniaturized Czochralski system to grow a series of continuous solid solution single crystals, Y1-xGdxAlO3:0.5%Ce (x = 0, 0.25, 0.5, 0.75, 1), and studied their quality, optical, and scintillation properties. Our findings demonstrate that the Gd3+ concentration induces lattice distortion and cracking due to configurational entropy and local chemical stress, highlighting the need for optimizing growth conditions. Furthermore, the electronic structure analysis reveals that higher Gd3+ content reduces the bandgap and the rising edge of the Ce3+ 4f-5d1 absorption transition, leading to a diminished light yield. Lastly, energy transfer between Gd3+ and Ce3+ evolves with Gd3+ concentration, resulting in faster decay times and changes in emission spectra, which offer valuable guidance for tailoring scintillation performance. This paper concludes that the comprehensive performance of YGdAP:Ce can be successfully optimized by elaborately adjusting the Y/Gd ratio. The tailored Y0.5Gd0.5AlO3:0.5%Ce crystal features a high density (6.43 g cm-3), an extremely fast decay component (8.7 ns, 42.1%), and a relatively high light yield (12000 ph MeV-1). It integrates good scintillation performance, comparable to that of YAP:Ce, and high γ-ray detection efficiency. Moreover, the absence of expensive lutetium in YGdAP:Ce makes it a cost-effective alternative scintillator for γ-ray detectors. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:Rare-earth aluminate perovskites have emerged as a promising class of scintillation crystals due to their high density and fast decay time. However, engineering their properties and growing bulk crystals with superior comprehensive performance for γ-ray detection remain a significant challenge. This paper employed a miniaturized Czochralski system to grow a series of continuous solid solution single crystals, Y<subscript>1-x</subscript>Gd<subscript>x</subscript>AlO<subscript>3</subscript>:0.5%Ce (x = 0, 0.25, 0.5, 0.75, 1), and studied their quality, optical, and scintillation properties. Our findings demonstrate that the Gd<sup>3+</sup> concentration induces lattice distortion and cracking due to configurational entropy and local chemical stress, highlighting the need for optimizing growth conditions. Furthermore, the electronic structure analysis reveals that higher Gd<sup>3+</sup> content reduces the bandgap and the rising edge of the Ce<sup>3+</sup> 4f-5d1 absorption transition, leading to a diminished light yield. Lastly, energy transfer between Gd<sup><sup>3+</sup></sup> and Ce<sup>3+</sup> evolves with Gd<sup><sup>3+</sup></sup> concentration, resulting in faster decay times and changes in emission spectra, which offer valuable guidance for tailoring scintillation performance. This paper concludes that the comprehensive performance of YGdAP:Ce can be successfully optimized by elaborately adjusting the Y/Gd ratio. The tailored Y<subscript>0.5</subscript>Gd0.5AlO<subscript>3</subscript>:0.5%Ce crystal features a high density (6.43 g cm-3), an extremely fast decay component (8.7 ns, 42.1%), and a relatively high light yield (12000 ph MeV-1). It integrates good scintillation performance, comparable to that of YAP:Ce, and high γ-ray detection efficiency. Moreover, the absence of expensive lutetium in YGdAP:Ce makes it a cost-effective alternative scintillator for γ-ray detectors. [ABSTRACT FROM AUTHOR]
ISSN:14668033
DOI:10.1039/d5ce00502g