Spectroscopic properties of Nd³⁺ in MgAl₂O₄ spinel nanocrystals

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• 作者：P.J. Dere24 ; ; ^{P.Deren@int.pan.wroc.pl} ; K. Maleszka-Bagi24 ; ska ; P. G22 ; uchowski ; M.A. Ma22 ; ecka
• 关键词：Nanocrystallite ; MgAl2O4 spinel ; Nd3+ ; Cross-relaxation ; Sol&ndash ; gel process
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 June, 2012
• 卷：525
• 期：Complete
• 页码：39-43
• 文件大小：742 K

摘要

Nd³⁺ doped MgAl₂O₄ spinel nanocrystals have been prepared by the sol-gel method. Their size decreases from 12 to 7 nm with increasing Nd³⁺ concentration from 0.1 to 5%, respectively. Some crystal field components of the Nd³⁺ energy levels in MgAl₂O₄ spinel were found from the 300 K reflectance absorption and the 77 K emission spectra. The ⁴F_3/2 鈫?#xA0;⁴I_9/2 transition dominates in the emission spectra and accordingly spectroscopic-quality parameter (SQP) is equal to 3.3 for all samples. Decay time of the emission from the ⁴F_3/2 level in MgAl₂O₄:Nd³⁺ (0.1%) nanocrystals is equal to 90 渭s, and decreases with increasing neodymium concentration due to very efficient cross-relaxations. The slope of cross-relaxation rate is close to 2 which indicates fast donor-donor transfer.