Sotiriou Georgios A, Schneider Melanie, Pratsinis Sotiris E
Particle Technology Laboratory, Institute of Process Engineering Department of Mechanical and Process Engineering, Sonneggstrasse 3, CH-8092 Zurich, Swiss Federal Institute of Technology, ETH Zurich, Switzerland.
J Phys Chem C Nanomater Interfaces. 2011 Feb 3;115(4):1084-1089. doi: 10.1021/jp106137u.
Rare-earth phosphors with tunable optical properties are used in display panels and fluorescent lamps and have potential applications in lasers and bio-imaging. Here, non-aggregated YO nanocrystals either doped with Tb (1-5 at%) or co-doped with Tb (2 at%) and Eu (0.1-2 at%) ions are made in one-step by scalable flame spray pyrolysis. The morphology of these nanophosphors is investigated by X-ray diffraction, electron microscopy and N adsorption while their optical properties are monitored by photoluminescent spectroscopy. When yttria nanocrystals are doped with terbium, a bright green emission is obtained at an optimum Tb-content of 2 at%. When, however, europium is added, the emission color of these Tb-doped yttria nanophosphors can be tuned precisely from green to red depending on the Tb/Eu ratio. Furthermore, energy-transfer from Tb to Eu is observed, thus allowing the control of the excitation spectra of the co-doped nanophosphors.
具有可调光学性质的稀土磷光体用于显示面板和荧光灯，并且在激光和生物成像方面具有潜在应用。在此，通过可扩展的火焰喷雾热解一步制备了掺杂Tb（1-5原子%）或共掺杂Tb（2原子%）和Eu（0.1-2原子%）离子的非聚集YO纳米晶体。通过X射线衍射、电子显微镜和N吸附研究了这些纳米磷光体的形态，同时通过光致发光光谱监测它们的光学性质。当氧化钇纳米晶体掺杂铽时，在铽含量为2原子%的最佳条件下获得亮绿色发射。然而，当添加铕时，这些掺杂铽的氧化钇纳米磷光体的发射颜色可以根据Tb/Eu比率从绿色精确调节到红色。此外，观察到了从Tb到Eu的能量转移，从而可以控制共掺杂纳米磷光体的激发光谱。
