Real-time stress sensing based on mechanoluminescence materials has been widely studied for structural health monitoring of bridges,buildings,high-pressure vessels,and other infrastructure surfaces.However,this approach is difficult to detect the stress information of closed mechanical structures.Here,we propose a delayed stress memory strategy to record the stress information of closed mechanical structure by the flexible film composed with CaA12O4:Eu2+,Sm3+phosphor.After the force is applied,the optical information on the film can be read out by the near-infrared laser after a period of time without real-time monitoring,and the stress distribution information of bearings and gears in the engine can be obtained.Furthermore,the regulation of trap depth from 0.662 to 1.042 eV allows the captured carriers to remain in the traps for a long time without being released as long persistent luminescence,which is beneficial to the delayed stress memory.Therefore,this work promotes the application prospect of mechanoluminescence materials in stress sensing,and provides a new idea to record the stress information of closed mechanical structures.

Yiyu CAI;Sibo LIU;Lei ZHAO;Chao WANG;Hongyu LV;Bitao LIU;Jianbei QIU;Xuhui XU;Xue YU

School of Mechanical Engineering,Institute for Advanced Materials,Chengdu University,Chengdu 610106,China;College of Materials Science and Engineering,Key Laboratory of Advanced Materials of Yunnan Province,Kunming University of Science and Technology,Kunming 650093,China;Department of Orthopedics,The First People's Hospital of Yunnan Province,Kunming 650093,China;School of Physics and Opto-Electronic Technology,Baoji University of Arts and Sciences,Baoji 721016,China;Research Institute for New Materials Technology,Chongqing University of Arts and Sciences,Chongqing 402160,China

先进陶瓷（英文版）

[1]Yiyu CAI;Sibo LIU;Lei ZHAO;Chao WANG;Hongyu LV;Bitao LIU;Jianbei QIU;Xuhui XU;Xue YU-.Delayed stress memory by CaAl2O4∶Eu2+mechanoluminescent phosphor with defect engineering regulation)[J].先进陶瓷（英文版）,2022(08):1319-1329

Eu2+mechanoluminescent,mechanoluminescence,CaA12O4,Sm3+phosphor

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