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基于光学辐照方法调控荧光光强及显色性

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随着信息技术的发展,产品防伪和信息保护已成为许多行业密切关注的问题,研发防伪复杂度高的光学防伪材料受到研究人员越来越多的关注.选用Er3+掺杂Ca2SnO4基体,发现Er3+掺杂将占据4h位阳离子位置,在提升材料的光学性能过程中,具有两方面的作用.一方面,Er3+作为发光中心,380 nm激发下,分别产生以550 nm为主峰的绿光发射和以671 nm为主峰的红光发射.另一方面,非等价的取代掺杂在材料中引入缺陷陷阱捕获载流子形成色心,有助于材料具备光致变色能力.在UV光源辐照后,材料的光致发光光强和荧光寿命表现出衰减调制现象.同时,材料的荧光显色参数如CIE色度坐标、色纯度、相关色温也会因UV光源辐照被调控.最后,借助能量传递理论,分析得到由发光中心向色心的能量传递是材料荧光调控现象产生的原因.上述研究表明通过外部光源照射的方式能够对Er3+掺杂Ca2SnO4荧光光强及显色性产生调控,在光学防伪领域具有应用潜力.
Modulation of fluorescence intensity and color rendering based on optical irradiation methods
With the development of information technology,anti-counterfeiting and information protection have become a closely watched issue in many industries,and the development of optical anti-counterfeiting materials with high anti-counterfeiting complexity has received more and more attention from researchers.In this study,Er3+-doped Ca2SnO4 matrix was chosen to investigate the photoluminescence and fluorescence modulation prop-erties of the material.It is found that Er3+doped Ca2SnO4 matrix will occupy the 4h-site cationic position,which plays a twofold role in the process of enhancing the optical properties of the material.On the one hand,Er3+acts as a luminescent center and produces green light emission with 550 nm as the main peak and red emis-sion with 671 nm as the main peak under 380 nm excitation,respectively.On the other hand,non-equivalent substitutional doping introduces defect traps in the material to trap carriers to form color centers,which helps the material to have photochromic capability.After irradiation with a UV light source,the photoluminescence intensity and fluorescence lifetime of the material exhibit attenuation modulation.At the same time,the fluores-cent color rendering parameters of the material,such as C1E chromaticity coordinates,color purity,and corre-lated color temperature,are also modulated by irradiation with a UV light source.Finally,with the help of en-ergy transfer theory,the energy transfer from the luminescence center to the color center is analyzed and ob-tained as the reason for the fluorescence modulation phenomenon of the material.The above studies show that the fluorescence intensity and color rendering of Er3+-doped Ca2SnO4 can be modulated by external light source irradiation,which has potential application in the field of optical anti-counterfeiting.

optical anti-counterfeitinglight intensity modulationphotoluminescencecolor rendering modulation

陈浩、惠增哲、陈玉丽、龙伟、张小丽、丁礼磊

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安康学院电子与信息工程学院,陕西安康 725000

西安工业大学材料与化工学院,西安 710016

光学防伪 光强调控 光致发光 显色调控

国家自然科学基金项目陕西省教育厅一般专项项目陕西省教育厅一般专项项目陕西省高校科协青年人才托举计划项目安康市科学技术研究发展计划项目安康学院校级项目

1217400423JK027120JK047520220442AK2023-GY-082023AYPT09

2024

10.3969/j.issn.1001-9731.2024.06.020

功能材料
重庆材料研究院 中国仪器仪表学会仪表材料学会

功能材料

CSTPCD北大核心
影响因子：0.918
ISSN：1001-9731
年,卷(期)：2024.55(6)