Synthesis and characterization of BaAl₂O₄:Eu²⁺ co-doped with different rare earth ions

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• 作者：M.A. Lephoto^a ; O.M. Ntwaeaborwa^a ; ^{ntwaeab@ufs.ac.za} ; ^{mothubm@unisa.ac.za} ; Shreyas S. Pitale^a ; H.C. Swart^a ; J.R. Botha^b ; B.M. Mothudi^c
• 关键词：Combustion synthesis ; Phosphors ; Photoluminescence ; Thermoluminescence
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 May, 2012
• 卷：407
• 期：10
• 页码：1603-1606
• 文件大小：723 K

摘要

Combustion method was used in this study to prepare BaAl₂O₄:Eu²⁺ phosphors co-doped with different trivalent rare-earths (Re³⁺=Dy³⁺, Nd³⁺, Gd³⁺, Sm³⁺, Ce³⁺, Er³⁺, Pr³⁺ and Tb³⁺) ions at an initiating temperature of 600 掳C. The phosphors were annealed at 1000 掳C for 3 h. As confirmed from the X-ray diffraction (XRD) data, both as prepared and post annealed samples crystallized in the well known hexagonal structure of BaAl₂O₄. All samples exhibited bluish-green emission associated with the 4f⁶5d¹鈫?f⁷ transitions of Eu²⁺ at 鈭?00 nm. Although the highest intensity was observed from Er³⁺ co-doping, the longest afterglow (due to trapping and detrapping of charge carriers) was observed from Nd³⁺ followed by Dy³⁺ co-doping. The traps responsible for the long afterglow were studied using thermoluminescence (TL) spectroscopy.