Zeler Justyna, Jerzykiewicz Lucjan B, Zych Eugeniusz
Faculty of Chemistry, University of Wroclaw, 14. F. Joliot-Curie Street, 50-383 Wroclaw, Poland.
Wroclaw Research Centre EIT+, 147 Stablowicka Street, 54-066 Wroclaw, Poland.
Materials (Basel). 2014 Oct 20;7(10):7059-7072. doi: 10.3390/ma7107059.
Li₂SO₄ or (Li₂SO₄ + SiO₂)-mixture fluxes were used to prepare a Lu₂O₃:Eu powder phosphor as well as an undoped Lu₂O₃ utilizing commercial lutetia and europia as starting reagents. SEM images showed that the fabricated powders were non-agglomerated and the particles sizes varied from single microns to tens of micrometers depending largely on the flux composition rather than the oxide(s)-to-flux ratio. In the presence of SiO₂ in the flux, certain grains grew up to 300-400 μm. The lack of agglomeration and the large sizes of crystallites allowed making single crystal structural measurements and analysis on an undoped Lu₂O₃ obtained by means of the flux technique. The cubic structure with = 10.393(2) Å, and Ia space group at 298 K was determined. The most efficient radioluminescence of Lu₂O₃:Eu powders reached 95%-105% of the commercial Gd₂O₂S:Eu.
使用硫酸锂或硫酸锂与二氧化硅的混合助熔剂，以商用氧化镥和氧化铕为起始原料制备了氧化镥:铕粉末荧光粉以及未掺杂的氧化镥。扫描电子显微镜图像显示，制备的粉末没有团聚，颗粒尺寸从单微米到几十微米不等，这主要取决于助熔剂的组成，而不是氧化物与助熔剂的比例。在助熔剂中存在二氧化硅的情况下，某些晶粒生长到300 - 400微米。缺乏团聚以及大尺寸的微晶使得能够对通过助熔剂技术获得的未掺杂氧化镥进行单晶结构测量和分析。确定了在298 K时具有a = 10.393(2) Å的立方结构以及Ia空间群。氧化镥:铕粉末的最高效放射发光达到了商用硫氧化钆:铕的95% - 105%。
