Synthesis of High Brightness Red Long Persistent Phosphor (Sr _1-X Ca _X)S: Eu, Dy by Sol-Gel Thermolysis Method

Abstract

The red long persistent phosphors (Sr 1-x Ca x) S: Eu 2+ , Dy 3+ (0≤x≤0.4) were prepared by sol-gel thermolysis method under reducing atmosphere. The results of XRD indiSuperscript textcated that the phosphor of the major phase was SrS (0≤x≤0.4) and the diffraction peak positions shift to higher angles with increase in x. The spectral properties are measured, and it found that the emission wavelength and decay properties of the phosphor varied with x. With increasing x, the luminescence intensity increased at beginning ,then decreased, and at x=0.3, the initial brightness and the afterglow time of the phosphor became maximal.