Thin film formation of the polyvinylpyrrolidone-added europium tetrakis (dibenzoylmethide)- triethylammonium and its mechanoluminescent properties

Abstract

Mechanoluminescence (ML) is a light emission from materials induced by any mechanical stress. We have synthesized europium tetrakis (dibenzoylmethide)- triethylammonium (EuD4TEA) and investigated its mechanoluminescent properties. The study has revealed that the ML intensity of EuD4TEA is enhanced by an addition of polyvinylpyrrolidone (PVP). Recently we have succeeded to form a thin film of the PVP-added EuD4TEA. The thin films with different amounts of the PVP addition are formed on an Al2O3 buffer layer prepared on Ni substrate. The present study has investigated a relationship between both the ML and the photoluminescence properties of thin films and the addition amount. The results suggest that the properties are strongly related to a crystallinity of the thin films.