Citation: WANG Fei, TIAN Yi-Guang, ZHANG Qiao. Synthesis, Crystal Structure and luminescent Properties of Sr_0.955Al_2-xB_xSi₂O₈: 0.025Eu²⁺ Phosphors[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(6): 1085-1092. doi: 10.11862/CJIC.2019.126 shu

Synthesis, Crystal Structure and luminescent Properties of Sr_0.955Al_2-xB_xSi₂O₈: 0.025Eu²⁺ Phosphors

WANG Fei ^1,2,, ,
TIAN Yi-Guang ^3,, ,
ZHANG Qiao ³

1.
Experimental Center of Anhui Sanlian University, Hefei 230601, China
2.
College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
3.
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China

Corresponding author: WANG Fei, wangfchina@163.com TIAN Yi-Guang, gytian@wzu.edu.cn
Received Date: 27 December 2018
Revised Date: 10 April 2019

Figures(11)

A series of luminescence phosphors Sr_0.955Al_2-xB_xSi₂O₈:0.025Eu²⁺ (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 Sr_0.955Al_2-xB_xSi₂O₈:0.025Eu²⁺ (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.
- luminescence,
- SrAl₂Si₂O₈:Eu²⁺,
- B(Ⅲ)-substitution,
- crystal structure,
- luminescent properties
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沈阳化工大学材料科学与工程学院沈阳 110142

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通讯作者: 陈斌, bchen63@163.com

Synthesis, Crystal Structure and luminescent Properties of Sr_0.955Al_2-xB_xSi₂O₈: 0.025Eu²⁺ Phosphors