Eu3+/Dy3+ Co-Doped Sr3Y2(BO3)4 Phosphor Luminous Properties
Research
HU Xin-yan1, CAO Long-fei1, LI Jin-hua1, 2, 3, LI Shuang1*
1. School of Physics, Changchun University of Science and Technology, Changchun 130022, China
2. Key Laboratory of Cross-scale Micro-Nano Manufacturing, Ministry of Education, Changchun 130022, China
3. Jilin Provincial Key Laboratory of Nanophotonics and Biophotonics, Changchun 130022, China
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 (4F9/2→6H15/2) and 576 nm orange emission (4F9/2→6H13/2) of Dy3+, And with the increase of Dy3+ ions concentration, it has an inhibitory effect on the 5D0→7F1, 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
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