CaYAlO<sub>4</sub>: Tb<sup>3+</sup>绿色荧光粉的低温燃烧合成及发光性能

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Abstract The CaYAlO₄: Tb³⁺ green luminescent phosphors were synthesized by low temperature combustion using urea as fuel and ethylene glycol as complexing agent. The structures of the phosphors were analyzed by XRD to determine the optimum synthesis temperature and urea dosage. The morphology and luminescent effect of phosphors were observed and tested, the effects of the amount of Tb³⁺ doping on the luminescence properties of the phosphor were investigated. The results show that the optimum ratio of urea to CaYAlO₄ is n(CH4N₂O):n(Ca)=3:1, and the optimum synthesis temperature is 800 ℃. The synthesized samples are spherical particles with a diameter of about 15 nm. The excitation spectra of the phosphors is mainly composed of a broadband excitation band of O^2-→Y³⁺, O^2-→Tb³⁺, the excitation peak wavelength is 265 nm. The emission spectra consists of excitation peaks at 490, 545, 586 and 620 nm, which are derived from the ⁵D₄ to ⁷F_J(J=6, 5, 4, 3) transition of Tb³⁺, respectively. The 545 nm transition intensity is the largest and the phosphor glows green. The optimum doping concentration of Tb³⁺ is 0.06%. The concentration quenching is caused by exchange interaction. Under the excitation of UV 265 nm, the color coordinate of the emission spectrum of CaY_0.96AlO₄: 0.06Tb³⁺ phosphor is (0.320, 0.363), which is located at the junction of green-yellow-white light on the CIE1931 chromaticity diagram, and it is a potential single-doped green luminescent material for LED.

Key words： low temperature combustion method CaYAlO₄: Tb³⁺ phosphor excitation spectra emission spectra

Received: 27 November 2018 Published: 11 July 2019

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	Articles by authors
	WANG Shuxue
	DENG Jingyu
	YU Long
	LUO Hu
	GAO Xiaofeng
	ZHU Desheng

Cite this article:

WANG Shuxue,DENG Jingyu,YU Long, et al. Low temperature combustion synthesis and luminescence properties of CaYAlO₄: Tb³⁺ green phosphors[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 282-288.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I3/282

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