Multicolor Mechanoluminescence From Lu<sub>3</sub>Al<sub>2</sub>Ga<sub>3</sub>O<sub>12</sub>: Tb, Eu for Stress and Temperature Visual Sensing
Zhiyao Zhou, Sheng Wu, Binli Xiao, Yao Xiao, Peishan Shao, Pan Zheng, Jieni Ning, Yinzhen Wang, Puxian Xiong
Abstract
Abstract 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 Tb 3+ /Eu 3+ ‐doped Lu 3 Al 2 Ga 3 O 12 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 Eu 3+ concentration. In addition, LAGO: 0.25% Tb 3+ and LAGO: 1.5% Eu 3+ are physically mixed at different mass ratios, and the varied stimuli‐responsed emission characteristics of Tb 3+ and Eu 3+ 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 I R (I Tb /I Eu ). 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.