The features of morphology and crystalline structure of the monodisperse Lu2O3:Eu3+ submicrospheres prepared by sol–gel method

✍ Scribed by Yulia Yermolayeva; Alexander Tolmachev; Valentin Tkachenko; Nikolay Danylenko; Ryhor Fedaruk

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 612 KB
• Volume: 317
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.01.025

✦ Synopsis

Monodisperse Lu 2 O 3 :Eu 3 + submicrospheres with the diameters ranging from 40 to 400 nm were obtained by the urea-based homogeneous precipitation technique with subsequent spheres crystallization during annealing. The inner structure, morphology of Lu 2 O 3 :Eu 3 + polycrystalline spheres and thermal stability of the particles shape were investigated by means of transmission electron microscopy (TEM), X-ray diffractometry (XRD) and electron paramagnetic resonance (EPR). Eu 3 +doped lutetium oxide spheres were characterized by effective luminescence under X-ray excitation in the l¼575-725 nm range corresponding to 5 D 0 -7 F J transitions (J ¼0-4) of Eu 3 + ions. Experimental data showed that the X-ray luminescence efficiency increases with the increase of the crystallites size, which occurred by the annealing temperature and particles diameter.