Temperature and concentration quenching of Tb³⁺ emissions in Y₄Al₂O₉ crystals

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• 作者：Z. Boruc^a ; ^{z.boruc@stud.elka.pw.edu.pl} ; B. Fetlinski^a ; M. Kaczkan^a ; S. Turczynski^b ; D. Pawlak^b ; M. Malinowski^a
• 关键词：Terbium ion ; Visible emission ; Energy transfer ; Fluorescence quenching ; Y4Al2O9
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 August, 2012
• 卷：532
• 期：Complete
• 页码：92-97
• 文件大小：903 K

摘要

Spectroscopic properties of trivalent terbium (Tb³⁺) activated Y₄Al₂O₉ (abbreviated YAM) crystals were studied. Concentration and temperature dependent emission spectra and fluorescence dynamics profiles have been investigated in YAM:Tb³⁺ in order to understand better processes responsible for quenching of the terbium ⁵D₃ and ⁵D₄ emissions. Decays were modelled using Inokuti-Hirayama approach to obtain information on the energy transfer mechanism. The cross-relaxation transfer rates were experimentally determined as a function of temperature and Tb³⁺ concentration. The investigation revealed strong influence of cross-relaxation process on ⁵D₃ emission quenching. The two different processes responsible for the increase of fluorescence quenching with growing temperature were observed, both related to thermal activation energy. For temperatures above 700 K, the temperature dependence of the emission intensity ratio (⁵D₃/⁵D₄) becomes linear and the decay times are rapidly decreasing monotonously with increasing temperature, what is confirming the potential of Y₄Al₂O₉:Tb³⁺ material in high temperature luminescence thermometry.