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Research Article | Open Access

Delayed stress memory by CaAl2O4:Eu2+ mechanoluminescent phosphor with defect engineering regulation

Yiyu CAIa,b,Sibo LIUc,Lei ZHAOdChao WANGbHongyu LVbBitao LIUeJianbei QIUbXuhui XUa,b( )Xue YUa,b( )
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

† Yiyu Cai and Sibo Liu contributed equally to this work.

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Graphical Abstract


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 CaAl2O4: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.

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Journal of Advanced Ceramics
Pages 1319-1329
Cite this article:
CAI Y, LIU S, ZHAO L, et al. Delayed stress memory by CaAl2O4:Eu2+ mechanoluminescent phosphor with defect engineering regulation. Journal of Advanced Ceramics, 2022, 11(8): 1319-1329.








Web of Science






Received: 03 February 2022
Revised: 04 May 2022
Accepted: 17 May 2022
Published: 11 July 2022
© The Author(s) 2022.

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