溶胶-凝胶法制备的 Eu2+掺杂铝酸盐的结构与发光性能

Structural and Luminescent Properties of Eu2+-doped Aluminates Prepared by the Sol-gel Method.

作者信息

Celan-Korošin Nataša, Meden Anton, Bukovec Nataša

出版信息

Acta Chim Slov. 2012 Dec;59(4):912-9.

Abstract

Alkaline earth aluminates with the overall nominal compositions Mg0.5Sr0.5Al2O4 (MSA), Ca0.5Sr0.5Al2O4 (CSA) and Ca0.5Mg0.5Al2O4 (CMA) doped with 0.5 or 1 mol% of Eu2+ ions were obtained by a modified aqueous sol-gel method and annealed in a reductive atmosphere at 900, 1000, 1100 and 1300 °C. The sample compositions and their structures were studied by XRD employing the Rietveld method. Solid solubility was confirmed in CSA only, due to the similar ionic radii of Ca2+ and Sr2+. UV excited luminescence was observed in the blue region (λ = 440 nm) in samples of CSA and CMA containing the monoclinic phase of CaAl2O4 and in the green region (λ = 512 nm) in samples of MSA containing hexagonal or monoclinic phases of SrAl2O4.

摘要

通过改进的水溶胶 - 凝胶法制备了总体标称组成为Mg0.5Sr0.5Al2O4（MSA）、Ca0.5Sr0.5Al2O4（CSA）和Ca0.5Mg0.5Al2O4（CMA）且掺杂了0.5或1 mol% Eu2+离子的碱土铝酸盐，并在900、1000、1100和1300°C的还原气氛中进行退火。采用Rietveld方法通过XRD对样品组成及其结构进行了研究。由于Ca2+和Sr2+的离子半径相似，仅在CSA中证实了固溶体的存在。在含有CaAl2O4单斜相的CSA和CMA样品中，在蓝色区域（λ = 440 nm）观察到紫外激发发光；在含有SrAl2O4六方相或单斜相的MSA样品中，在绿色区域（λ = 512 nm）观察到紫外激发发光。