Citation: ZHENG Xue, CHEN Yue, JIA Ying-Hua, CHEN Xuan-Feng, MU Zhe, WANG Xiao-Fang, MA Chi, ZHOU Wen-Li, LIAN Shi-Xun. Composition-Screening and Luminescent Mechanism in Ca_2-ySr_ySiO₄: Ce³⁺, Li⁺ for High Quantum Efficiency and Thermally Stable Blue-Emitting Phosphor[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(9): 1659-1668. doi: 10.11862/CJIC.2020.185 shu

Composition-Screening and Luminescent Mechanism in Ca_2-ySr_ySiO₄: Ce³⁺, Li⁺ for High Quantum Efficiency and Thermally Stable Blue-Emitting Phosphor

Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research(Ministry of Education), Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province College, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China

Corresponding author: LIAN Shi-Xun, sxlian@hunnu.edu.cn
Received Date: 7 February 2020
Revised Date: 9 April 2020

Figures(7)

Ca_2-x-ySr_y-xSiO₄:xCe³⁺, xLi⁺ solid solution phosphors were designed and prepared by a high temperature solid-state reaction in a reductive atmosphere. The results of the XRD reveal that as-synthesized samples are single-phase compounds, and a phase transition from monoclinic β-Ca₂SiO₄ to orthogonal α'-Ca₂SiO₄ exists (y=0~0.25). The excitation and emission spectra of the phosphors showed a gradual redshift with the increase of Sr content (y) from 0 to 0.25, which showed the largest Stokes shift (73 nm) for Ca_1.75Sr_0.25SiO₄, and subsequently a blueshift showed up after a further increase of y value. Moreover, the host of Ca_1.1Sr_0.9SiO₄ can induce Ce³⁺ ions preferentially to occupy the ten-coordinated Sr²⁺ sites (SrO10) while Li⁺ ions replace the eight-coordinated Ca²⁺ sites (CaO8). The optimized phosphor Ca_1.05Sr_0.85SiO₄:0.05Ce³⁺, 0.05Li⁺ (CS_0.85SO:Ce) possessed a high internal quantum efficiency (IQE) reached 91.18%. The temperature-dependent photoluminescence (PL) spectra showed that the PL intensity of CS_0.85SO:Ce at 200℃ maintained 98.70% of that at room temperature. The luminescent mechanisms were discussed in detailed according to crystal structure, crystal field theory and the Dorenbos model.
- solid solution,
- Ca_1.1Sr_0.9SiO₄:Ce³⁺,
- blue phosphor,
- quantum efficiency,
- thermal stability
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Composition-Screening and Luminescent Mechanism in Ca2-ySrySiO4: Ce3+, Li+ for High Quantum Efficiency and Thermally Stable Blue-Emitting Phosphor

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通讯作者: 陈斌, bchen63@163.com

Composition-Screening and Luminescent Mechanism in Ca_2-ySr_ySiO₄: Ce³⁺, Li⁺ for High Quantum Efficiency and Thermally Stable Blue-Emitting Phosphor