Citation: SHI Cai-Wen, JI Chang-Yan, ZENG Ting, HUANG Zhi, TIAN Xiu-Ying, PENG Yang-Xi. Synthesis and Luminescence Properties of Red Phosphor Sr₃La₂Ge₃O₁₂:Sm³⁺ with High Color Purity and Thermal Stability[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(5): 901-907. doi: 10.11862/CJIC.2020.112 shu

Synthesis and Luminescence Properties of Red Phosphor Sr₃La₂Ge₃O₁₂:Sm³⁺ with High Color Purity and Thermal Stability

1.
Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, Hunan 417000, China
2.
National Electronic Ceramics Product Quality Supervision and Inspection Center(Hunan), Loudi, Hunan 417000, China

Corresponding author: JI Chang-Yan, jcy20061986@126.com
Received Date: 23 February 2020
Revised Date: 11 March 2020

Figures(7)

A series of red emitting phosphors Sr₃La_2-xGe₃O₁₂:xSm³⁺ (0 ≤ x ≤ 0.04) were synthesized through a conventional high temperature solid state method, and the morphology, elemental composition, crystal structure, luminescence properties, and thermal stability were studied. The results showed that sample Sr₃La_1.97Ge₃O₁₂:0.03Sm³⁺ had a broad crystal size distribution. The energy dispersive spectrum (EDS) analysis predicted that there were only Sr, La, Ge, O, Sm elements in Sr₃La_1.97Ge₃O₁₂:0.03Sm³⁺. The Rietveld refinement patterns of Sr₃La_1.97Ge₃O₁₂:0.03Sm³⁺ crystallized in a hexagonal unit cell fitted well with the observed XRD results. The host lattice Sr₃La₂Ge₃O₁₂ exhibited an energy band gap of 5.54 eV which belongs to the class of wide band gap materials. Moreover, samples Sr₃La_2-xGe₃O₁₂:xSm³⁺ (0 ≤ x ≤ 0.04) exhibited a maximum emission peak located at 601 nm ascribed to the ⁶H_5/2→⁴L_13/2 energy level transitions of Sm³⁺ when excited at 404 nm. Significantly, sample Sr₃La_1.97Ge₃O₁₂:0.03Sm³⁺ not only possessed a relatively optimum photoluminescence properties with a Commission Internationale De I'eclairage (CIE) coordinates of (0.532 1, 0.460 1) and a color purity up to 94.2% among these synthesized materials, but also exhibited splendid thermal stability with the photoluminescence intensity remained 81.6% of its initial value when the temperature was 423 K.
- Sr₃La₂Ge₃O₁₂:Sm³⁺,
- high temperature solid state method,
- red phosphor,
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通讯作者: 陈斌, bchen63@163.com

Synthesis and Luminescence Properties of Red Phosphor Sr₃La₂Ge₃O₁₂:Sm³⁺ with High Color Purity and Thermal Stability