Interfacial Interaction Modulated Radiation Defects for Self‐Charging Persistent Mechanoluminescence
Yingjuan Yan, Bo Zhou, Ziyi Guo, Xiao He, Wanyuan Wei, Shaofan Fang, Lei Zhao, Zhaofeng Wang
Abstract
Abstract Self‐charging persistent mechanoluminescence (SC‐PML) is of particular interest for stress sensing/visualization applications, as it not only notably extends the time window available for stress observation, but also avoids the pre‐charging with great convenience. However, the intrinsic physical principles of the SC‐PML are still unclear. Herein, a phosphor Sr 9 LiMg(PO 4 ) 7 : Dy 3+ with an initially clean trap structure is reported to exhibit repeatable SC‐PML up to 30 s when incorporated into a flexible polydimethylsiloxane. The observed divergence between the SC‐PML and the transient photoluminescence provides a unique insight in terms of the mechanics‐induced trap creation for delving into the fundamental mechanisms. The muti‐mode stimuli/irradiation tests further suggest the presence of a high‐energy process at interface associated with the mechanoluminescence. This process is capable of producing effects analogous to those of X‐ray irradiation, and sufficient to facilitate the generation of trapping centers within Sr 9 LiMg(PO 4 ) 7 : Dy 3+ lattice. The above findings provide a clear insight for SC‐PML, and the as‐developed SC‐PML material is further applied for the multi‐mode anticounterfeiting and stress‐sensing devices as representatives.