期刊
CRYSTAL GROWTH & DESIGN
卷 20, 期 6, 页码 3851-3860出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.0c00154
关键词
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资金
- National Key R&D Program of China [2016YFB400605]
- Youth Research Fund of GRINM Group Co., Ltd.
Near-infrared (NIR) phosphors with capability for blue light to 850 nm broadband NIR emission conversion are highly desirable for security-monitoring LEDs. Targeted phosphor LaSc2.93-yGayB4O12(LSGB): 0.07Cr(3+) (y = 0.6) is designed from the initial model of LaSc2.93B4O12(LSB): 0.07Cr(3+) by chemical composition modification. The correlations among crystal-field environment, structural evolution, and luminescence properties of LSGB: 0.07Cr(3+) (0 = y = 1.5) are elucidated by the Dq/B values, decay curves, and polyhedron distortion. The substitution of Sc3+ by Ga3+ in LSGB: Cr3+ (0 = y = 1.5) leads to decreasing structural polyhedron distortion and strengthened crystal field, consequently resulting in the blue-shift of broadband emission and enhanced thermal stability of LSGB: 0.07Cr(3+) (y = 0.6) compared to that of LSB: 0.07Cr(3+). The above results demonstrate that the superiority of blue-shift and enhanced thermal stability of LSGB: 0.07Cr(3+) (y = 0.6) make it more suitable for the blue-pumped securitymonitoring LEDs.
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