Title of Paper:Synthesis and luminescence enhancement of CaySr4?x?yAl2O7:xEu2+phosphors by a novel halide-assisted solid-state reaction method

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Affiliation of Author(s):材料科学与技术学院

Journal:J Mater Sci Mater Electron

Abstract:Eu2+doped strontium aluminate phosphors CaySr4−x−yAl2O7:xEu2+(0 ≤ x ≤ 0.1, 0 ≤ y ≤ 0.1) were synthesized via a novel halide-assisted solid-state reaction method. The phase structure and photoluminescence properties of CaySr4−x−yAl2O7:xEu2+were characterized via X-ray diffraction (XRD) and fluorescence spectrophotometer. The XRD patterns indicate that the α-Sr4Al2O7phase structure with negligible impurities were produced in the samples of CaySr4−x−yAl2O7:xEu2+(x ≤ 0.1 and y ≤ 0.1) at 1450 °C. Photoluminescence results show that the CaySr4−x−yAl2O7:xEu phosphor with NH4I as reductant presents typical intense Eu2+red emission bands centered at 610 nm while excited by 450 nm. Accordingly, samples without NH4I only exhibit two weak Eu3+emission peaks located at 598 and 619 nm, respectively. It can be ascribed to the reduction characteristic of I−ion. Furthermore, by partial replacement of Sr2+with Ca2+in Sr4Al2O7host, the emission intensity is enhanced up to 260% with emission peak red shifted by 5–10 nm. These results indicate that partial substitution of Sr2+by Ca2+is an efficient way to increase the proportion of longer wavelength emission and luminescence intensity for Sr4Al2O7:Eu phosphors. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Volume:29

Issue:12

Page Number:10487-10493

ISSN No.:0957-4522

Translation or Not:no

Date of Publication:2018-06-01

Included Journals:EI