Structure and luminescence properties of Li2Gd4(MoO4)7:Sm3+ orange-red phosphor for solid-state lighting

Lu Jing-Wen; Zhao Jin; Zhang Yong-Chun; Tu Ru-Ting; Liu Fu-Ni; Leng Zhi-Hua

doi:10.7498/aps.73.20241017

Abstract

White LEDs have the broad application prospect and market demand, while the red phosphor can greatly affect the color temperature and color rendering index of the modulated white light. In this work, a series of Li₂Gd_4–x Sm_x(MoO₄)₇ (x = 0.01–0.13) phosphors is prepared by the high-temperature solid phase method. The successful doping of Sm³⁺ into Li₂Gd₄(MoO₄)₇ is confirmed by X-ray diffractometry (XRD) and does not lead to any change in crystal structure. The samples are detected by scanning electron microscope (SEM) to have irregular blocky structures with particle size less than 20 μm. The existence of Li, Gd, Mo, O and Sm elements in the phosphor is confirmed by energy dispersive X-ray spectroscopy (EDS). The observation of X-ray photoelectron spectroscopy (XPS) shows that the activators are successfully doped into materials. Under 406 nm excitation, the emission peaks of the samples are located at 563, 598, 645 and 706 nm respectively, which are caused by the 4f-4f transition of Sm³⁺, and the strongest emission peak comes from ⁴G_5/2→⁶H_9/2 transition. It is found that optimal concentration of Sm³⁺ is 0.07. With the increase of Sm³⁺ concentration, the fluorescence lifetime decreases gradually. The temperature-dependent emission of phosphor is also studied. The emission intensity at 473 K is still 79% of that at 298 K, indicating that the sample has excellent heat resistance. The CIE chromaticity diagram shows the luminescence of the prepared phosphor is located in the orange-red region and the color purity is high (99%). Moreover, a white LED is fabricated using the optical doped phosphor, which has CIE coordinates of (0.3788, 0.3134) that are located in the circle of white light. Research shows that the Li₂Gd₄(MoO₄)₇:Sm³⁺ phosphor is a promising orange-red phosphor for white LEDs.

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Corresponding author: Zhao Jin, zhaojin@xauat.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11804265), the Key Science and Technology Innovation Team of Shaanxi Province, China (Grant No. 2022TD-30), and the Natural Science Basic Research Program of Shaanxi Province, China (Grant No. 2024JC-YBMS-384).

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Concentration of Sm³⁺	CIE coordinates (x, y)	Color purity/%
x = 0.01	(0.6311, 0.3682)	99.77
x = 0.03	(0.6314, 0.3679)	99.86
x = 0.05	(0.6315, 0.3678)	99.89
x = 0.07	(0.6315, 0.3679)	99.89
x = 0.09	(0.6318, 0.3676)	99.98
x = 0.11	(0.6313, 0.3680)	99.83
x = 0.01	(0.6312, 0.3681)	99.80

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Vol. 73, Issue 21 - 2024-11-05

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