Ion beam induced amorphization and bond breaking in Zn₂SiO₄:Eu³⁺ nanocrystalline phosphor

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• 作者：D.V. Sunitha^a ; H. Nagabhushana^a ; ^{bhushanvlc@gmail.com} ; Fouran Singh^b ; S.C. Sharma^a ; N. Dhananjaya^c ; B.M. Nagabhushana^d ; R.P.S. Chakradhar^e ; ¹ ; ^{chakra@nal.res.in}
• 关键词：Phosphor ; Luminescence ; FT-IR ; Swift heavy ion irradiation
• 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：May, 2012
• 卷：90
• 期：Complete
• 页码：18-21
• 文件大小：561 K

摘要

This paper reports on the ionoluminescence (IL) of Zn₂SiO₄:Eu³⁺ nanophosphors bombarded with 100 MeV Si⁷⁺ ions with fluences in the range (3.91-21.48) 脳 10¹² ions cm^鈭?. The prominent IL emission peaks recorded at 580, 590, 612, 650 and 705 nm are attributed to the luminescence centers activated by Eu³⁺ ions. It is observed that IL intensity decreases and saturates with increase of Si⁷⁺ ion fluence. Fourier transform infrared (FT-IR) studies confirm surface/bulk amorphization for a fluence of (3.91-21.48) 脳 10¹³ ions cm^鈭?. These results show degradation of SiO (2谓₃) bonds present on the surface of the sample and/or due to lattice disorder produced by dense electronic excitation under heavy ion irradiation. These results are discussed in detail.