A narrowband ultraviolet-B-emitting LiCaPO4:Gd3+ phosphor with super-long persistent luminescence for over 100 h†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Xihui Shan, Xulong Lv, Dongxun Chen, Yi Zhang, Lixin Ning and Yanjie Liang
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Abstract

The past decades have witnessed a significant increase in interest in inorganic luminescent materials that emit in the narrowband ultraviolet-B (NB-UVB; 310–313 nm) spectral region due to the growing need for applications in photochemistry and photomedicine. However, the majority of existing NB-UVB phosphors rely on photoluminescence, which requires constant external excitation. This common but inconvenient photoluminescence style significantly slows down the progress of NB-UVB luminescence technology. Herein, we report the design and synthesis of a new Gd3+-doped NB-UVB-emitting persistent phosphor, LiCaPO4:Gd3+, which shows strong NB-UVB persistent luminescence peaking at 312 nm and a super-long persistence time of >100 h after ceasing X-ray excitation. Owing to the zero-background noise from the ambient light, a UVB camera can detect the NB-UVB light emission originating from the charged LiCaPO4:Gd3+ phosphor in a bright indoor environment. Through spectroscopic investigations and first-principles calculations, the nature of energy traps and the persistent luminescence mechanism of Gd3+ in the LiCaPO4 host have been thoroughly studied. Besides, remarkable photochromic behavior when irradiating the phosphor with X-rays is also observed, and the possible intrinsic point defects that contribute to the colorization are proposed. This NB-UVB persistent phosphor shows great potential in indoor optical tagging, optical information storage, and dermatological therapy.

Abstract Image

窄带紫外线-B 发光 LiCaPO4:Gd3+ 荧光粉,持续发光时间超长达 100 小时
过去几十年来,由于光化学和光医药应用需求的不断增长,人们对在窄带紫外线-B(NB-UVB;310-313 纳米)光谱区发光的无机发光材料的兴趣大增。然而,现有的大多数 NB-UVB 荧光粉都依赖于需要持续外部激发的光致发光。这种常见但不方便的光致发光方式大大延缓了 NB-UVB 发光技术的发展。在此,我们报告了一种新型掺杂 Gd3+ 的 NB-UVB 发光持久荧光粉 LiCaPO4:Gd3+的设计与合成,它在 312 纳米波长处显示出强烈的 NB-UVB 持久发光峰,并且在停止 X 射线激发后具有 100 小时的超长持久发光时间。由于环境光的零背景噪声,UVB 摄像机可以在明亮的室内环境中检测到带电 LiCaPO4:Gd3+ 荧光粉发出的 NB-UVB 光。通过光谱研究和第一原理计算,我们深入研究了能量陷阱的性质以及 Gd3+ 在 LiCaPO4 中的持续发光机制。此外,在用 X 射线照射荧光粉时,还观察到了明显的光致变色行为,并提出了导致着色的可能的内在点缺陷。这种 NB-UVB 持久荧光粉在室内光学标签、光学信息存储和皮肤病治疗方面具有巨大潜力。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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