Upconversion luminescence of cubic and hexagonal structured SrTa4O11:Er3+/Yb3+ phosphors

被引：2
作者：
Wang, Xuekai [1 ]
Cao, Yongze [1 ]
Yan, Xianglan [1 ]
Xu, Sai [1 ]
Zhang, Jinsu [1 ]
Liu, Tianshuo [2 ]
Chen, Baojiu [1 ]
机构：
[1] Dalian Maritime Univ, Dept Phys, Dalian 116026, Peoples R China
[2] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
来源：
DALTON TRANSACTIONS | 2024年 / 53卷 / 40期
基金：
中国国家自然科学基金;
关键词：
RARE-EARTH; ER3+; DEPENDENCE; EFFICIENCY; EMISSION; IMPROVE; SIZE;
D O I：
10.1039/d4dt02252a
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Cubic and hexagonal structured SrTa4O11(STO):Er3+/Yb3+ phosphors were synthesized by a solid state reaction (SSR) and molten salt synthesis (MSS). The upconversion luminescence (UCL) intensity of these samples was investigated. Hexagonal STO:Er3+/Yb3+ with much or a little beta-Ta2O5 can be synthesized by SSR in air or vacuum, respectively, and the UCL intensity of the sample synthesized by SSR in a vacuum is higher. Cubic STO:Er3+/Yb3+ can be synthesized by MSS with KCl flux, and hexagonal STO:Er3+/Yb3+ can be synthesized by MSS with B2O3 flux, which has the strongest UCL intensity among all the samples compared with samples prepared by SSR. The sample by MSS with B2O3 flux was acid pickled (AP) with HCl solution, and the green UCL intensity increased by 2.18 times, which reached 32.95% for beta-NaYF4:Er3+/Yb3+. The UCL intensity of the hexagonal STO:Er3+/Yb3+ is much higher than that of the cubic structure, which is due to the layered structure and the non-central symmetry of the Er3+/Yb3+ doped sites in hexagonal STO:Er3+/Yb3+. The temperature sensitivity of samples is evaluated by luminescence intensity ratio (LIR) technology. The maximum relative sensitivity is 0.0099 K-1 at 303 K. All the results show that hexagonal STO:Er3+/Yb3+ has excellent pure green UCL intensity and high temperature sensitivity, which can be used in UCL display and temperature sensing.
引用
收藏
页码：16530 / 16540
页数：11
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