Revealing the Intrinsic Decay of Mechanoluminescence for Achieving Ultrafast‐Response Stress Sensing

Abstract

Converting mechanical energy into photon emission provides a promising route for intelligent sensing, self‐powered lighting, and distributed energy harvesting, which is of great significance for finding a feasible solution to the current sensing technical bottleneck and energy crisis. As the basis for understanding the conversion mechanism and realizing high‐frequency mechanical energy utilization, elucidating the dynamic process of intensity variation in the mechano‐to‐photon conversion remains a great challenge. Herein, a time‐domain characterization scheme that enables to unravel the intrinsic decay of mechanoluminescence (ML) with lifetimes from milliseconds down to tens of microseconds is constructed. It is demonstrated that ML decay characterization is an important tool to reveal the dynamics of charge migration in ML materials. The ML decay in a typical self‐reproducible ML material ZnS:Mn2+ shows temperature dependence and stress fluctuation resistance, which opens up a new reliable approach for self‐powered and remote temperature sensing. Finally, benefiting from the shortest ML lifetime recorded to date, an ultrafast‐response stress sensor that enables to detect individual pulses of ultrasonic waves with ML sensing technology is developed.

Ultrasensitive and robust mechanoluminescent living composites

“…Thus, our living composites outperformed those classical mechanoluminescent materials in terms of reusability and sensitivity. The response time (15 to 20 ms) of our living composites is comparable to that of the ceramic particle-filled soft mechanoluminescent materials ( 12 , 53 – 55 ).…”

Simultaneous NIR photoluminescence and mechanoluminescence from Cr3+ activated MgGa2O4 phosphors with multifunctions for optical sensing

“…At the same time, the PLE spectrum of MGO:Cr 3+ detected at 710 nm consists of two strong absorption bands centered at 440 ( 4 A 2 → 4 T 1 ) and 590 nm ( 4 A 2 → 4 T 2 ), which matches the commercial blue LED chip and can be better used as a device in the later stage. 32–34 Fig. 2b shows the PL spectrum of MGO: x %Cr 3+ ( x = 0–2).…”

Multi-Mode Luminescence in Smart Near-Infrared Cr3+/Pr3+ Codoped SrGa12O19 Phosphors Induced by Three Distinct Excitation Mechanisms

“…Widely embraced for its unique attributes, including high efficiency, speed, strong penetration, and invisibility, it has become an integral element in continuous advancements in food quality testing, anticounterfeiting security, etc . Concurrently, various luminescent driving forces, such as mechanical stimulation, current stimulation, and thermal stimulation, have elevated the application of NIR materials to new heights . Consequently, the development of high-performance, multistimulus intelligent NIR materials is pivotal for addressing the current challenges.…”

“…2 Concurrently, various luminescent driving forces, such as mechanical stimulation, current stimulation, and thermal stimulation, have elevated the application of NIR materials to new heights. 3 Consequently, the development of high-performance, multistimulus intelligent NIR materials is pivotal for addressing the current challenges.…”