Multicolor Mechanoluminescence From Lu3Al2Ga3O12: Tb, Eu for Stress and Temperature Visual Sensing

• Published in: Advanced optical materials 2025-01, Vol.13 (1), p.n/a
• Main Authors: Zhou, Zhiyao, Wu, Sheng, Xiao, Binli, Xiao, Yao, Shao, Peishan, Zheng, Pan, Ning, Jieni, Wang, Yinzhen, Xiong, Puxian
• Format: Article
• Language: English
• Subjects: Europium; Mass ratios; Mechanoluminescence; multicolor; Structural safety; Tb3+/Eu3; temperature/stress dual sensing; Terbium; Visual stimuli
• ISSN: 2195-1071; 2195-1071
• DOI: 10.1002/adom.202401993

Mechanoluminescence (ML) refers to the luminescence phenomenon that occurs when a material is under external mechanical stimuli. However, relying solely on stress information to obtain ML signals is prone to test errors in complex test conditions. In this work, a Tb3+/Eu3+‐doped Lu3Al2Ga3O12 multicolor ML material is reported, in which the ML color can be adjusted from white to red (CIE color coordinates: from (x = 0.313, y = 0.3293) to (x = 0.6183, y = 0.379)) by changing the Eu3+ concentration. In addition, LAGO: 0.25% Tb3+ and LAGO: 1.5% Eu3+ are physically mixed at different mass ratios, and the varied stimuli‐responsed emission characteristics of Tb3+ and Eu3+ ions are used to develop a stress and temperature dual sensing device. Stress and temperature information can be further reflected simultaneously through the blue/red emission ratio IR (ITb/IEu). As the temperature increases, the color changes from white to red (CIE color coordinates: from (x = 0.3259, y = 0.306) to (x = 0.4707, y = 0.3625)), and the relative temperature sensitivity (Sr) is as high as 1.209% K−1 at 298 K. This sensing device provides a new idea for potential structural safety monitoring, multi‐modal anti‐counterfeiting technology, etc. In this work, by altering the doping concentration of Eu3+, a color‐tunable ML compound has been prepared. A stress‐temperature dual‐mode imaging system is constructed by utilizing the different responses of Tb3+ and Eu3+ ions to stress and temperature. Calculating IR (ITb /IEu) and observing the corresponding color provide a solution for accurately obtaining real‐time stress and temperature data. It has potential application prospects in human‐computer interaction, structural safety detection, and multi‐modal information storage.