Effects of Charge Compensators on Structure and Luminescent Properties of Microwave Synthesized CaMoO₄:Eu³⁺ Red Phosphors

Abstract:

Red phosphors CaMoO₄:Eu³⁺ were synthesized by microwave method with MnO₂ as microwave absorbent. The phase structure and luminescent properties of the as-synthesized phosphors were investigated by X-ray powder diffraction and Fluorescence spectrophotometer. The results show that when the reaction time was 40 min, microwave power was medium-high fire (~560 W), we got the tetragonal CaMoO₄:Eu³⁺ pure phase. The excitation spectrum of CaMoO₄:Eu³⁺ was composed by a broad band between 200 nm and 350 nm and a series of peaks from 350 nm to 500 nm. The main peak was at 305 nm. The emission spectrum was composed of a series of peaks in the range of 550~750 nm and the main peak was at 617 nm due to the ⁵D₀→⁷F₂ transition of Eu³⁺. Doping charge compensator Li⁺, Na⁺ or K⁺ could improve the luminous intensity of the sample. When the doping amount of Li⁺, Na⁺ or K⁺ were 8 mol%, the luminous intensity of the sample reached the maximum. The intensity of the emission peak at 617 nm was 4.04, 3.42, 3.48 times of sample without doping charge compensator.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 592-597
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.592
• Online since: January 2017
• Authors: Ying Han, Zhi Lin Li, Wan Zhang, Yan Jie Yin, Yan Mei Li, Li Li Wang, Yong Qing Zhai*
• Keywords: Camoo₄:Eu³⁺, Charge Compensator, Microwave Method, Red Phosphor

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