Novel elastico-mechanoluminescence materials CaZnOS:Mn2+ and CaZr(PO4)2:Eu2+

Abstract

This paper highlights our work on the recent progress in novel elastico-mechanoluminescence (EML) materials CaZnOS:Mn2+ and CaZr(PO4)2:Eu2+, which can simultaneously "feel" (sense) and "see" (image) the applied mechanical stress as an intense and proportional luminescence. CaZnOS:Mn2+ can sense various types of mechanical stress, including ultrasonic vibration, impact, friction and compression because of the large piezoelectric coefficient. CaZr(PO4)2:Eu2+ with multiple trap levels shows a broad measurement range for dynamic load. Both of CaZnOS:Mn2+ and CaZr(PO4)2:Eu2+ belong to the defect-controlled type piezoelectric phosphors, and their EML mechanisms could be explained using the piezoelectrically induced carrier de-trapping model.

Keywords

• Mechanoluminescence
• stress
• phosphor
• piezoelectricity
• trap