![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
The present paper reports the effect of temperature on the mechanoluminescence (ML) intensity of certain fluorescent and phosphorescent molecular crystals. The ML intensity decreases with temperature and follows the relation IT = IO T (1 - T/Tc ) n. The value of n lies between 0.90 and 1.10 for the piezoelectric crystals. Generally the ML of piezoelectric crystals ceases near their melting point, however, it disappears in non-piezoelectric crystals much below their melting points. It is shown that the decrease of ML efficiency with temperature should involve both, the change in crystal properties with temperature and the usual decrease in quantum yield caused by increased radiationless transition.
