Nanotechnology Application Centre (Formerly Nanophosphor Application Centre), University of Allahabad, Allahabad 211 002, India.
Opt Lett. 2010 Jul 15;35(14):2331-3. doi: 10.1364/OL.35.002331.
Well-crystallized pure hexagonal phase YBO(3):Eu(3+) nanoparticles are prepared by the reverse micelles method. Vacuum ultraviolet photoluminescence (VUVPL) spectroscopy showed size-dependent nonlinear luminescence enhancement with remarkably improved chromaticity (0.62, 0.34), as compared to the commercial bulk YBO(3):Eu(3+) phosphor (0.56, 0.39). The quenching concentration of Eu(3+) doping and the ratio of red ((5)D(0)-->(7)F(2)) to orange ((5)D(0)-->(7)F(1)) emission was found significantly enhanced with the decrease in particle size, making it an ideal VUV phosphor for plasma display panels. The possible explanation for size dependence of the Eu-O charge transfer process via lowering of the structural symmetry is proposed in detail.
采用反胶束法制备了结晶良好的纯六方相 YBO(3):Eu(3+)纳米粒子。真空紫外光致发光(VUVPL)光谱显示，与商用块状 YBO(3):Eu(3+)荧光粉(0.56, 0.39)相比，尺寸依赖性的非线性发光增强，色坐标显著改善(0.62, 0.34)。Eu(3+)掺杂的猝灭浓度和红色((5)D(0)-->(7)F(2))与橙色((5)D(0)-->(7)F(1))发射的比值随着粒径的减小而显著增强，使其成为等离子体显示面板的理想 VUV 荧光粉。详细提出了通过降低结构对称性来解释 Eu-O 电荷转移过程的尺寸依赖性的可能解释。
