Abstract
This paper highlights our work on the recent progress in novel elastico-mechanoluminescence (EML) materials CaZnOS : Mn 2+ and CaZr ( PO 4)2: Eu 2+, which can simultaneously "feel" (sense) and "see" (image) the applied mechanical stress as an intense and proportional luminescence. CaZnOS : Mn 2+ can sense various types of mechanical stress, including ultrasonic vibration, impact, friction and compression because of the large piezoelectric coefficient. CaZr ( PO 4)2: Eu 2+ with multiple trap levels shows a broad measurement range for dynamic load. Both of CaZnOS : Mn 2+ and CaZr ( PO 4)2: Eu 2+ belong to the defect-controlled type piezoelectric phosphors, and their EML mechanisms could be explained using the piezoelectrically induced carrier de-trapping model.
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