Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK.
Nanoscale. 2013 Feb 7;5(3):1091-6. doi: 10.1039/c2nr33391k. Epub 2012 Dec 21.
Nanometre sized particles of terbium and erbium co-doped yttrium oxysulfide up-converting phosphors were prepared by a urea homogeneous-precipitation method. Results from X-ray powder diffraction (XRPD), scanning electron microscopy (SEM) and photoluminescence spectroscopy studies on the microstructure and luminescent properties of the materials are reported. Upconversion emission was observed from the Er(3+) cations when particles were excited with laser light of 632.8 nm wavelength. Under these conditions no interactions between the Er(3+) cations and the Tb(3+) cations were observed. In contrast there was evidence from the Stokes emission of the Er(3+) cations under 254 nm excitation for an interaction between the Er(3+) and Tb(3+) cations reducing intensity of the latter's blue and green emission bands by cross relaxation processes.
采用尿素均相沉淀法制备了铽和铒共掺杂的氧化钇硫氧酸盐纳米颗粒上转换荧光粉。报道了材料微观结构和发光性能的 X 射线粉末衍射（XRPD）、扫描电子显微镜（SEM）和光致发光光谱研究结果。当用波长为 632.8nm 的激光激发粒子时，观察到来自 Er(3+) 阳离子的上转换发射。在这些条件下，没有观察到 Er(3+) 阳离子与 Tb(3+) 阳离子之间的相互作用。相比之下，在 254nm 激发下，从 Er(3+) 阳离子的斯托克斯发射中可以看出，Er(3+) 和 Tb(3+) 阳离子之间存在相互作用，通过交叉弛豫过程降低了后者的蓝色和绿色发射带的强度。
