SIZE VARIATION OF Tb-DOPED Gd2O3 NANOPARTICLES STUDIED BY X-RAY EXCITED LUMINESCENCE AND DIFFRACTION

Autor:	Yun-Liang Soo, Y. W. Yang, S. W. Huang, V. Chhabra, R. N. Bhargava, Y. H. Kao, L. J. Lai, B. Kulkami, J. V. D. Veliadis
Rok vydání:	2001
Předmět:	Diffraction Materials science Chemical physics Quantum dot Excited state Doping Nanoparticle Statistical and Nonlinear Physics Electronic structure Condensed Matter Physics Luminescence Powder diffraction
Zdroj:	Modern Physics Letters B. 15:205-211
ISSN:	1793-6640 0217-9849
DOI:	10.1142/s021798490100163x
Popis:	Post-fabrication heat treatment has been found as an effective means for controlling the size distribution of Tb-doped Gd 2 O 3 nanoparticles. Variations in the electronic structure and structural order of these doped quantum dots are investigated by using the techniques of X-ray excited luminiscence and diffraction. From room temperature to 1000°C X-ray powder diffraction of this nanoparticle system shows a three-stage transition from featureless data to that of the bulk crystalline structure with increasing particle size. However, substantial changes found in the X-ray excited luminescence are not directly related to the crystalline structure of the nanoparticles. These observations also indicate that bulk-like crystalline phase of the quantum dot material is not a necessary condition for generating the X-ray induced optical effects which are useful for some technological applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4f2cc3d9f22bf05263875e8385864b99 https://doi.org/10.1142/s021798490100163x Zobrazit plný text záznamu