Structural and spectroscopic diagnosis of Eu:ZnO and Eu:Yb:ZnO glass and ceramics

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• 作者：A. Bahadur ; Y. Dwivedi ; S.B. Rai ; ^{sbrai49@yahoo.co.in}
• 关键词：Luminescence ; Rare earth ions ; Wide band gap semiconductor ; ZnO ; Spectroscopy ; Eu2O3
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：June, 2012
• 卷：91
• 期：Complete
• 页码：217-221
• 文件大小：935 K

摘要

Eu and Eu:Yb codoped ZnO nanocrystals embedded in B₂O₃ glass matrix were synthesized and their structural, optical properties were discussed. On excitation with 532 nm laser radiation intense orange/red emissions from Eu³⁺ ions were observed. The fluorescence intensity was found to enhance on annealing. Frequency upconversion emissions from Eu³⁺ ions were observed in presence of Yb³⁺ ions on excitation with NIR (976 nm) laser. The enhancement in emission intensity was explained and the photo-physics involved is linked with the unique structural properties of the crystallites formed. Ion interactions and the different energy transfer parameters were also calculated.