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Synthesis, Crystal Structure and luminescent Properties of Sr0.955Al2-xBxSi2O8: 0.025Eu2+ Phosphors
Author NameAffiliationE-mail
WANG Fei Experimental Center of Anhui Sanlian University, Hefei 230601, China
College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China 
wangfchina@163.com 
TIAN Yi-Guang College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China gytian@wzu.edu.cn 
ZHANG Qiao College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China  
Abstract: A series of luminescence phosphors Sr0.955Al2-xBxSi2O8:0.025Eu2+ (x=0~0.9) were prepared via solid-state reaction in a weak reductive atmosphere. The lattice positions and the luminescent mechanism of Eu2+ in the host were discussed, the effects of B(Ⅲ)-substitution on the host lattices and spectral properties were also investigated. It was found that the complete solid solutions were formed in the whole range of x=0~0.9, as B(Ⅲ) substituted for Al(Ⅲ) entered to SrAl2Si2O8. The lattice parameters (a, b, c) and unit cell volume (V) of phosphors Sr0.955Al2-xBxSi2O8:0.025Eu2+ (x=0~0.9) decreased linearly and lattice parameter (β) increased linearly as the increase of substitution amount of B(Ⅲ). A broad excitation spectrum consisted of four excitation bands, which was in a range of 225~400 nm, and an apparent peak at 350 nm. Full width at half maximum (FWHM) increased from 90 to 102 nm as increase of the substitution amount of B(Ⅲ). The emission spectrum was a broad-band in a range of 370~600 nm, which could be fitted two peaks of 409 and 447 nm, and its apparent peak was at 409 nm. Two fitted peaks were blue shifted and the intensity ratio of the fitted peaks decreased linearly as the increase of the substitution amount of B(Ⅲ)). The coordination number of Sr2+ was 9 in SrAl2Si2O8:Eu2+, which has been confirmed by the experimental results and empirical formula of Van Uitert. The distance between the luminescent center Eu and the ligand O increased due to the Al(Ⅲ) replaced by B(Ⅲ), so that the crystal field strength of Eu2+ decreased, and the 5d energy level split of the luminescent center Eu2+ decreased, the center of gravity of the lowest emission level of Eu2+ was shifted upward, and the two fitted peaks were linearly blue-shifted.
Keywords: luminescence  SrAl2Si2O8:Eu2+  B(Ⅲ)-substitution  crystal structure  luminescent properties
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WANG Fei,TIAN Yi-Guang,ZHANG Qiao.Synthesis, Crystal Structure and luminescent Properties of Sr0.955Al2-xBxSi2O8: 0.025Eu2+ Phosphors[J].Chinese Journal of Inorganic Chemistry,2019,35(6):1085-1092.
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Chinese Journal of Inorganic Chemistry