Citation: WANG Xiao-Hui, LI Gui-Fang, WEI Yun-Ge, GUAN Xu-Feng. Morphology-Controlled Synthesis and Luminescence Properties of Red-Emitting NaCaGd(WO₄)₃: Eu³⁺ Phosphors[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(10): 1881-1890. doi: 10.11862/CJIC.2020.216 shu

Morphology-Controlled Synthesis and Luminescence Properties of Red-Emitting NaCaGd(WO₄)₃: Eu³⁺ Phosphors

School of Advanced Materials and Nano Technology, Xidian University, Xi'an 710071, China

Corresponding author: LI Gui-Fang, gfli@mail.xidian.edu.cn
Received Date: 1 April 2020
Revised Date: 21 August 2020

Figures(12)

NaCaGd(WO₄)₃:Eu³⁺ red phosphors with controllable morphology were synthesized via the hydrothermal method. The influences of pH value, reaction temperature and Eu³⁺ concentration on the crystal structure, morphology and photoluminescence properties of NaCaGd(WO₄)₃:Eu³⁺ phosphors were investigated in detail. The results show that the pure tetragonal sheelite structure NaCaGd(WO₄)₃ with uniform tetragonal plate-like nanocrystallines was obtained when pH value was 9 and reaction temperature of 180℃. Under the excitation of 394 nm, the phosphors displayed a bright red emission corresponding to the characteristic 4f-4f transitions of Eu³⁺, and the intensity of emission peak mainly depends on the pH value, the reaction temperature and Eu³⁺ doped concentration. The optimum photoluminescence performance is achieved for NaCaEu(WO₄)₃ (x=1.0) phosphors synthesized at pH=9 under the reaction temperature 180℃. In addition, the thermal stability of the phosphors was analyzed under different ambient temperatures between 303 and 513 K. The result exhibits that the emission intensity of phosphor decreases with the increase of ambient temperature. Finally, the corresponding chromaticity coordinate and color purity were calculated to (0.658, 0.341) and 96.1%, which is close to the standard CIE chromaticity coordiante values for red light (0.673, 0.327).
- hydrothermal method,
- photoluminescence,
- phosphors,
- Eu³⁺ doping concentration
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Morphology-Controlled Synthesis and Luminescence Properties of Red-Emitting NaCaGd(WO4)3: Eu3+ Phosphors

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Morphology-Controlled Synthesis and Luminescence Properties of Red-Emitting NaCaGd(WO₄)₃: Eu³⁺ Phosphors