Citation: HOU Xiao-Fei, ZHAO Wan-Nan, MA Jing, SUN Ji-Qiang, LI Yan-Hong. Synthesis and Luminescence Properties of Eu³⁺ doped LaBO₃ Phosphors[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(2): 276-282. doi: 10.11862/CJIC.2020.016 shu

Synthesis and Luminescence Properties of Eu³⁺ doped LaBO₃ Phosphors

School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Corresponding author: LI Yan-Hong, lyhciom@126.com
Received Date: 3 August 2019
Revised Date: 8 November 2019

Figures(9)

LaBO₃:Eu³⁺ phosphors with different crystal phase were prepared by heat treatment precursor prepared by hydrothermal method. The structure, morphology and luminescence properties of the samples were characterized with X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), infrared spectroscopy and fluorescence spectroscopy. The effects of boric acid dosage, heat treatment temperature, and initial solution pH of precursor on structure and luminescence properties of the samples were studied. The results of XRD showed that the phosphors with orthogonal structure, monoclinic structure and both phase mixed structure can be obtained. LaBO₃ with pure orthogonal structure can be obtained by heating treatment at 700℃ for precursors synthesized with initial solution pH=8 and molar ratio of rare earth ions to boric acid of 1:3 and 1:4, respectively. It is convenient to obtained phosphors with orthogonal structure at proper boric acid dosage, higher heat treatment temperature and higher initial solution pH value. Infrared spectra showed that the change of initial solution pH and boric acid dosage effected the composition of precursor, and the heat treatment temperature effected the crystal phase transformation. SEM showed that particle size of LaBO₃:Eu³⁺ phosphor decreased with the increase of initial solution pH, which were consistent with the results calculated from XRD. The excitation spectra of samples consisted of the broad band in a range of 200~350 nm and another weak narrow lines in a range of 350~450 nm, which were assigned to O^2--Eu³⁺ charge transfer band and f-f transitions of Eu³⁺ ions, respectively. The emission spectra of samples consisted of sharp lines ranging from 500 to 750 nm, which are associated with the transitions from the excited ⁵D₀-⁷F_J (J=1, 2, 3, 4) of Eu³⁺ ions. The main emission peak at 615 nm was due to the ⁵D₀-⁷F₂ transitions of Eu³⁺, the peak at 593 nm was attributed to ⁵D₀-⁷F₁ transitions of Eu³⁺. The excitation and emission intensities are related to the structure of the samples. LaBO₃:Eu³⁺ with orthogonal structure has higher ultraviolet absorption and higher emission intensity with pure red light.
- phosphors,
- LaBO₃:Eu³⁺,
- hydrothermal method,
- heat treatment,
- luminescence
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通讯作者: 陈斌, bchen63@163.com

Synthesis and Luminescence Properties of Eu³⁺ doped LaBO₃ Phosphors