Influence of the fuels on the Mechanoluminescence properties of Dy doped ZnAl2O4 phosphors

Abstract

Most of commercial phosphors consist of suitably doped polycrystalline compounds. The activation means has been usually discussed, less attention has been paid to the influence of fuels on host preparation in the final performance of the products. In this paper different fuels have been followed to synthesize phosphors based on Dy doped ZnAl₂O₄. The mechanoluminescence (ML) properties of the materials have been given special consideration. Finally, various ML curves have been recorded in order to assess which of the fuel yields the most efficient Dy doped ZnAl₂O₄ compound. Dy doped ZnAl₂O₄ compound has been prepared by solution combustion technique with fuels such as urea, hydrazine and carbohydrazide separately. It is observed that urea enhances the ML intensity of the sample used. XRD result confirms formation of the phosphor. It is suggested that recombination of the trapped charge carriers are responsible for ML in this system.

Keywords: Mechanoluminescence, defects, dislocations.