Eu3+/Dy3+共掺Sr3Y2(BO3)4荧光粉的发光性质研究

doi:10.3964/j.issn.1000-0593(2022)07-2063-06

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Abstract Rare earth-doped luminescent materials have always been a hot spot in the field of scientific research and are widely used in the fields of white light LEDs, temperature sensing, display imaging, new energy and lasers. The matrix structure has a significant influence on the photoluminescence properties of rare-earth ions. Among many luminescent matrix materials, borate has the advantages of a wide range of light transmission, high optical damage threshold, better thermal stability and chemical stability. Alkaline-earth and rare-earth metal borates Sr₃Y₂(BO₃)₄ have excellent optical properties, and the study of its luminescence properties is of great significance. The rare-earth ion Eu³⁺ ions have a 4f⁶ electron layer, which is a typical down-conversion luminescence center ion, and is often selected as an activator of red luminescent materials. Dy³⁺ ions have a 4f⁹ electron layer, a typical down-conversion luminescence center ion. Under the excitation of ultraviolet light, there is a strong fluorescence emission in the blue and orange light areas. This paper synthesised, Sr₃Y₂(BO₃)₄∶Eu³⁺/Dy³⁺ phosphors by high-temperature solid-phase method. XRD and SEM characterized the structure and morphology of the samples. XRD results showed that when sintered at 1 000 ℃ for 5 hours, 20% excess of H₃BO₃ is the best preparation conditions, and doping with a small amount of Eu³⁺ ions and Dy³⁺ ions did not change the lattice structure of Sr₃Y₂(BO₃)₄. The SEM image shows that the average grain size of the Sr₃Y₂(BO₃)₄ matrix is 2~4 μm, compared with the SEM image of the 10% Eu³⁺ single-doped sample and 5% Eu³⁺/5% Dy³⁺ double-doped sample, the morphology and size of the matrix Sr₃Y₂(BO₃)₄ did not change significantly. The luminescence results of Sr₃Y₂(BO₃)₄∶Eu³⁺ samples show that the main luminescence of Eu³⁺ mono-doped Sr₃Y₂(BO₃)₄ phosphors at concentrations of 5%, 10% and 15% under excitation at 395nm and 466 nm is located at 593 and 613 nm. For red light emission, the peak intensity increases first and then decreases with the increase of Eu³⁺ concentration. When the doping concentration is 10%, the luminescence intensity is the highest, indicating a concentration quenching phenomenon. The CIE chromaticity coordinates results show that the excitation wavelength changes from 395 to 466 nm, and the emission color of Sr₃Y₂(BO₃)₄∶Eu³⁺ phosphor changes from orange-red to red. After the introduction of Dy³⁺, the emission spectrum of Sr₃Y₂(BO₃)₄∶Eu³⁺/Dy³⁺ samples showed the 486 nm blue emission (⁴F_9/2→⁶H_15/2) and 576 nm orange emission (⁴F_9/2→⁶H_13/2) of Dy³⁺, And with the increase of Dy³⁺ ions concentration, it has an inhibitory effect on the ⁵D₀→⁷F_{1, 2, 3, 4} transition of Eu³⁺. The CIE coordinates results show that by adjusting the ratio of doped ions Eu³⁺ and Dy³⁺, the color of Sr₃Y₂(BO₃)₄∶Eu³⁺/Dy³⁺ phosphor can be changed from the red area to the orange area, indicating that it has a good application prospect in the display.

Key words：Sr₃Y₂(BO₃)₄∶Eu³⁺/Dy³⁺; Color adjustable; Downconversion luminescence

Received: 2021-06-02 Accepted: 2021-11-21

ZTFLH:

O469

Corresponding Authors: LI Shuang E-mail: lishuang_317@126.com

Cite this article:

HU Xin-yan,CAO Long-fei,LI Jin-hua, et al. Eu³⁺/Dy³⁺ Co-Doped Sr₃Y₂(BO₃)₄ Phosphor Luminous Properties Research[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(07): 2063-2068.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2022)07-2063-06 OR https://www.gpxygpfx.com/EN/Y2022/V42/I07/2063