Long afterglow material and preparation method thereof

Abstract

The invention provides a long afterglow material. The chemical formula of the long afterglow material is as follows: SrAl2O4:Eu<2+>, Dy<3+>. A preparation method of the long afterglow material, namely, a method for synthesizing SrAl2O4:Eu<2+>, Dy<3+> with a high temperature solid state method comprises the following steps: weighing a certain quantity of raw materials including Al2O3, SrCO3, Eu2O3,Dy2O3, and H3BO3 in a ratio of substance amounts, grinding and mixing the raw materials uniformly, then putting the mixed raw materials in a tube furnace, calcining the mixed raw materials at 1350 DEG C in a weak reducing atmosphere for 4 h, and performing grinding and pulverizing to obtain the long afterglow material SrAl2O4:Eu<2+>, Dy<3+> with good luminescent property. Release of electrons ina trap in the long afterglow material comprises two types: instantaneous release and delayed release, instantaneous release of the electrons and further transition luminescence are composition of fluorescence, and delayed release leads to afterglow luminescence.

Description

technical field [0001] The invention relates to material technology, in particular to a long afterglow material and a preparation method thereof. Background technique [0002] Long afterglow materials refer to materials that store the energy of sunlight, fluorescent lamps and other light, and release it slowly in the form of visible light under temperature shifting. Because it does not need to consume excess energy and has no pollution to the environment, it is an ideal energy storage material. Since the French sidot first discovered that ZnS phosphor has a long afterglow phenomenon in 1866, a large number of researchers have paid attention to this phosphor. Long afterglow materials have been studied extensively, ranging from sulfur oxides to aluminates, silicates, and phosphates, etc., and significant progress has been made in luminescent mechanisms and practical applications. There is a direct relationship between the long afterglow of the material and the trap energy lev...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a long afterglow material in view of many problems of the current long afterglow material. The release of electrons in the internal traps of the long afterglow material includes two types: instantaneous release and delayed release. Among them, the electrons are released instantaneously and then transition to luminescence Is a component of fluorescence, delayed release causes afterglow