Narrowband ultraviolet-B-emitting LiCaPO4:Gd3+ phosphor with super-long persistent luminescence over 100 h

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xihui Shan, Xulong Lv, Dongxun Chen, Yi Zhang, Lixin Ning, 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 that 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 LiCaPO4 host have been thoroughly studied. Besides, remarkable photochromic behavior when irradiating the phosphor with X-ray is also observed, and the possible intrinsic point defects that contribute to the colorization are proposed. This NB-UVB persistent phosphor shows great potentials in indoor optical tagging, optical information storage, and dermatological therapy.
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
CiteScore
8.30
自引率
3.40%
发文量
1601
期刊介绍: ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.
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