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Photoluminescent properties of Eu 3+ ‐Eu 2+ activated MAl 2 Si x O 2 x + 4 (M = Mg, Ca, Sr, Ba) phosphors prepared in air
Author(s) -
Li Songchu,
Yu Lixin,
Man Xiaoqin,
Zhong Jianlin,
Sun Wei
Publication year - 2018
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3426
Subject(s) - photoluminescence , europium , phosphor , doping , alkaline earth metal , analytical chemistry (journal) , ion , alkali metal , aluminosilicate , materials science , luminescence , emission intensity , metal , inorganic chemistry , mineralogy , chemistry , catalysis , metallurgy , biochemistry , optoelectronics , organic chemistry , chromatography
In this paper, MAl 2 Si x O 2 x +4 :Eu 2+ /Eu 3+ (Eu 2+ + Eu 3+ = 2%, molar ratio; M = Mg, Ca, Sr, Ba; x = 0, 0.5, 1, 1.5, 2) phosphors with different SiO 2 concentrations (the ratio of SiO 2 to MAl 2 O 4 is n %, n = 0, 50, 100, 150, 200, respectively) were prepared by high‐temperature solid‐state reaction under atmospheric air conditions. Their structures and photoluminescent properties were systematically researched. The results indicate that Eu 3+ ions have been reduced and Eu 2+ ions are obtained in air through the self‐reduction mechanism. The alkaline earth metal ions and doping SiO 2 strongly affect the crystalline phase and photoluminescent properties of samples, including microstructures, relative intensity of Eu 2+ to Eu 3+ , location of emission lines/bands. It is interesting and important that the emission color and intensities of europium‐doped various phosphors which consist of aluminosilicate matrices prepared under atmospheric air conditions could be modulated by changing the kinds of alkaline earth metal and the content of SiO 2 .