CHEN Jiang ¹, JIANG Guojian ¹, ZHOU Peng ¹, LUO Jiawen ¹, SHEN Qingyi ²
(1. College of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China; 2. Repair Department
of Shanghai Stomatological Dispensary, Shanghai 200031, China)

Abstract: In this paper, Sr₂MgSi₂O₇: Eu²⁺, Eu³⁺, Dy³⁺ yellow long afterglow phosphors were synthesized by combustion synthesis method, using acid silica sol as raw material. X-ray powder diffraction (XRD) and fluorescence spectrophotometer as well as scanning electron microscopy (SEM) were used to analyze the phase, luminescent properties and morphology of the products, respectively. The results showedthat, it was easy for Sr₂MgSi₂O₇: Eu²⁺, Eu³⁺, Dy³⁺ powders to be crushed. The excitation peak was located at 350 nm. The main emission peak and the secondary emission peak were 568 nm and 475 nm, respectively. The afterglow time was able to reach 5 h.

Key words: Sr₂MgSi₂O₇; long afterglow phosphors; acid silica sol; combustion synthesis method