Study on the preparation and luminescence performance of rare earth-doped silica core-shell structured yttrium borate
Using borate as the matrix material,spherical and sea urchin-like silicon nanospheres with varying specific surface areas were prepared as precursors through sol-gel-high-temperature solid phase method.Single-doped YBO3∶Eu3+and co-doped YBO3∶Eu3+,Tb3+-coated SiO2 nanosphere core-shell structured fluorescent materials were synthesized by co-precipitation method-temperature solid phase method.The morphology and the luminescent performance of the generated fluorescent materials were analyzed using XRD,FT-IR,SEM,TEM,fluorescence spectrum representation,and CIE chromaticity calculations.The results proved that after doping with Eu3+,a slight distortion in the YBO3 lattice occurred,accompanied by minor shifts in absorption peaks in the FT-IR spectrum,which proved that Eu3+was successfully doped into the YBO3 lattice.YBO3 was wrapped on the surface of the SiO2 core with a block structure.Under the excitation of 395nm light,the emission peak strength at 612nm of the single-doped Eu3+fluorescent material was the strongest,which was a 5 D0→7F2 electric puppet transition of Eu3+.The matrix material exhibited self-excited blue light under 456 nm light excitation.Tb3+with green light was added for white light modulation.Under 275 nm excitation,the SiO2@YBO3∶5％Eu34,7％Tb3+produced chromaticity coordinate of(0.3130,0.2936),with a correlated color temperature of 6834.43K and color purity of 7.4％,making it a near-white light core-shell structured fluorescent material with potential for WLED core-shell composite application.
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