Zhao Xucai, Yu Qingqing, Zhang Lili, Wei Rongfei, Guo Hai
Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining, XinJiang 835000, China.
Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Apr 15;331:125789. doi: 10.1016/j.saa.2025.125789. Epub 2025 Jan 22.
As emerging anti-counterfeiting materials, persistent luminescence (PersL) materials have attracted much attention owing to their particular luminescent properties, including durable luminescence, facile identification, high security and environment-friendly. Especially, exploiting color-tunable dynamic afterglow materials that facilitate the use of advanced technology such as multi-mode dynamic anti-counterfeiting remains of great realistic significance. Herein, a series of BaSrGaGdO:Bi phosphors with tunable photoluminescence and PersL were synthesized by the cationic substitution strategy. The displacement of Ga by Gd induces an additional blue emission owing to the generation of a new Bi luminescence center. The pure white light is realized in BaSrGaGdO:0.8 %Bi,0.25 %K when excited by 325 nm light. Besides, color-tunable emission is triggered by changing the excitation wavelength or temperature. Significantly, excellent room-temperature PersL and dramatically intensified PersL with tunable color output under thermal stimulation are clearly discernible. Such properties result from the existence of multiple Bi luminescent centers and traps. These findings open up new ideas to produce color-tunable dynamic PersL materials for advanced anti-counterfeiting, information storage and encryption.
作为新兴的防伪材料，长余辉（PersL）材料因其独特的发光特性，包括持久发光、易于识别、高安全性和环境友好性而备受关注。特别是，开发颜色可调的动态余辉材料，以促进多模动态防伪等先进技术的应用，仍然具有重大的现实意义。在此，通过阳离子取代策略合成了一系列具有可调光致发光和长余辉的BaSrGaGdO:Bi荧光粉。Gd取代Ga会由于产生新的Bi发光中心而诱导额外的蓝光发射。当用325nm光激发时，在BaSrGaGdO:0.8%Bi,0.25%K中实现了纯白光。此外，通过改变激发波长或温度可触发颜色可调发射。值得注意的是，在室温下具有出色的长余辉，并且在热刺激下具有明显增强的、颜色输出可调的长余辉。这些特性源于多个Bi发光中心和陷阱的存在。这些发现为生产用于先进防伪、信息存储和加密的颜色可调动态长余辉材料开辟了新思路。
