Synthesis of Long Afterglow Phosphors MAl2O4:Eu2+, Dy3+(M=Ca, Sr, Ba) by Microemulsion Method and Their Luminescent Properties

Xiao Linjiu¹，Chen Yongjie¹，Qiu Guanming³，Tian Yiguang⁴，Sun Yanbin¹，Geng Xiujuan²

(1.School of Materials and Metallurgy, Northeastern University, Shenyang 110006, China;
2.School of Applied Chemistry, Shenyang Institute of Chemical Technology, Shenyang 110142, China;
3.School of Materials and Engineering, Changchun Science and Technology University, Changchun 130022, China;
4.Department of Chemistry, Wenzhou University, Wenzhou 325027, China;
5.College of Materials Science and Engineering, Jilin University, Changchun 130026, China)

Abstract:Long afterglow phosphors MAl2O4:Eu2+, Dy3+ (M=Ca, Sr, Ba) were synthesized by microemulsion method, and their crystal structure and luminescent properties were compared and investigated. XRD patterns of samples indicate that phosphors CaAl2O4:Eu2+, Dy3+ and SrAl2O4:Eu2+, Dy3+ are with monoclinic crystal structure and phosphor BaAl2O4:Eu2+, Dy3+ is with hexagonal crystal structure. The wide range of excitation spectrum of phosphors MAl2O4:Eu2+, Dy3+ (M=Ca,Sr,Ba) indicates that the luminescent materials can be excited by light from ultraviolet ray to visible light and the maximum emission wavelength of phosphors MAl2O4:Eu2+, Dy3+ (M=Ca, Sr, Ba) is found mainly at λem of 440 nm (M=Ca), 520 nm (M=Sr) and 496 nm (M=Ba) respectively, the corresponding colors of emission light are blue, green and cyna-green respectively. The afterglow decay tendency of phosphors can be summarized as three processes: initial rapid decay, intermediate transitional decay and very long slow decay. Afterglow decay curves coincide with formula I=At-n, and the sequence of afterglow intensity and time is Sr＞Ca＞Ba.

Key words:inorganic non-metal materials; microemulsion method; long afterglow phosphor; luminescent properties; rare earths;

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