Strong Elastico-Mechanoluminescence in Diphase (Ba,Ca)TiO[sub 3]:Pr[sup 3+] with Self-Assembled Sandwich Architectures

Abstract

Ba,Ca TiO3:Pr3+ diphase ceramics with the self-assembled piezoelectric/phosphor/piezoelectric sandwich architectures have been synthesized using the solid-state reaction method. Their structure, elastico-mechanoluminescence EML property, and trap energy levels are characterized. In the diphase region, strong EML has been obtained and optimized. The relation between EML and electroluminescence EL has been investigated. The EML phenomenon under the strong pressure is explained by the piezoelectrically induced EL model. Whereas, the mechanoluminescene mechanism under the weak pressure is discussed using the piezoelectrically induced charge detrapping model.