Design And Development Of Silicon/germanate Renewable Stress Luminescent Materials And Research On Their Luminescence Mechanism

Trap-mediated mechanoluminescence,featured by recoverable and quantitative luminescence in response to different mechanical stimuli,has attracted considerable interests in visual stress imaging,mechanically driven lighting and display,and security protection.However,the practical application of recoverable mechanoluminescent materials is limited.Firstly,the types of recoverable mechanoluminescent materials are rare,and high-performance materials are scarce.Secondly,recoverable mechanoluminescent materials are scarce,so that the mechanoluminescence law have not been summarized,so the development speed is slow.Therefore,we need to explore new development strategies for materials,consolidate the universal physical mechanism and promote the rapid development and practical process of materials.In this paper,We proposed a matrix ion replacement strategy to design four evolutionary matrices and introduce Mn²⁺activators to develop four new regenerative stress luminescent materials with different matrices,Na₂ZnSiO₄?Na₂ZnGeO₄?Na₂MgGeO₄?Li₂ZnGeO₄.Among them,Na₂ZnSiO₄,Na₂ZnGeO₄ and Na₂MgGeO₄ belong to the non-central symmetric space group P1n1,and Li₂ZnGeO₄ belongs to the central symmetric space group P2₁/n.It is confirmed that both the non-centrosymmetric intrinsic piezoelectric material and the centrally symmetric extrinsic piezoelectric material support the formation of mechanoluminescence,which expands the candidate matrix range of the novel materials.In addition,we studied the relationship between afterglow and mechanoluminescence,revealing the deeper distribution of mechanoluminescence traps relative to afterglow traps.Afterwards,the photoluminescence,afterglow and mechanoluminescence spectra of these four materials were compared.The red shift of the Mn²⁺emission spectrum of four materials with the evolution of the matrix crystal field was observed.The results can guide the fine adjustment of the luminescent color of mechanoluminescent materials.Finally,based on the comparison of the critical concentrations of photoluminescence,afterglow and mechanoluminescence doping activators of these four materials,the trap-mediated quenching process of mechanoluminescence is revealed,which guides the optimization of activator concentration of new materials.In summary,these findings have greatly expanded the design horizon of mechanoluminescent materials,deepening our understanding of trap-mediated mechanoluminescence mechanisms,and are expected to accelerate the development of new recoverable materials and promote their application in more fields.