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SPECTROSCOPY AND SPECTRAL ANALYSIS  2022, Vol. 42 Issue (02): 381-385    DOI: 10.3964/j.issn.1000-0593(2022)02-0381-05
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Synthesis and Luminescence Properties of Yellow-Emitting Phosphor Y2.93Al5O12∶0.07Ce3+ Under Blue Light Excitation
LI Zhao, WU Kun-yao, WANG Ya-nan, CAO Jing, WANG Yong-feng, LU Yuan-yuan
School of Materials Engineering, Xi’an Aeronautical University, Xi’an 710077, China
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Abstract  Using Al2(SO4)3·18H2O and urea as raw materials, the spherical α-Al2O3 powder was prepared by hydrothermal-pyrolysis method. Using self-made α-Al2O3, Y2O3 and CeO2 as raw materials, Y2.93Al5O12∶0.07Ce3+ yellow phosphors for white light LEDs were prepared by solid-phase method. Through X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray energy spectroscopy (EDS) and fluorescence spectroscopy (PL) etc. to characterize the phase, morphology and photoluminescence properties of the product. The results showed that the hydrothermal-pyrolysis method prepared spherical α-Al2O3 powder with pure phase and good dispersibility. Using the α-Al2O3 as raw material, the synthesized α-Al2O3 could be effectively excited by 460 nm blue light, and the emission spectrum peaked at 550 nm. Broadband Y2.93Al5O12∶0.07Ce3+ phosphor with color coordinates (0.453, 0.531 9), The XRD pattern of Y2.93Al5O12∶0.07Ce3+ phosphor was refined with GSAS software. The refined pattern is completely consistent with the XRD test pattern. The four elements of Y, Al, Ce and O are evenly distributed in the yellow phosphor product. The excitation spectrum of Y2.93Al5O12∶0.07Ce3+ yellow phosphor consists of two parts. There are two pronounced absorption peaks at 340 and 460 nm. The 4f energy level of Ce3+ is split into two spectra due to spin-coupling. Branch terms 2F7/2 and 2F5/2, 2F5/2 is the base spectrum term. The excitation peak at 340 nm corresponds to the transition from 2F5/25D5/2, the excitation peak at 460 nm belongs to the transition from 2F7/25D3/2, and the excitation intensity at 460 nm is stronger than the excitation intensity at 340 nm. The emission spectrum obtained with 460 nm as the monitoring wavelength, the strongest emission peak is at 550 nm, Y2.93Al5O12∶0.07Ce3+ phosphor is a high-performance yellow phosphor suitable for white LEDs.
Key words:Y2.93Al5O12∶0.07Ce3+; WLED; Phosphor; Luminescence properties
Received: 2021-01-18     Accepted: 2021-04-26    
ZTFLH:  O469  
Cite this article:   
LI Zhao,WU Kun-yao,WANG Ya-nan, et al. Synthesis and Luminescence Properties of Yellow-Emitting Phosphor Y2.93Al5O12∶0.07Ce3+ Under Blue Light Excitation[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(02): 381-385.
URL:  
https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2022)02-0381-05     OR      https://www.gpxygpfx.com/EN/Y2022/V42/I02/381