Hetero-junction assisted improved luminescence of Eu³⁺ doped ZnO-SnO₂ nanocomposite

详细信息    查看全文

• 作者：Ishant Chauhan¹ ; Sandeep Nigam ; ^{snigam@barc.gov.in" class="auth_mail" title="E-mail the corresponding author} ; V. Sudarsan ; R.K. Vatsa
• 关键词：Nano-composite ; Hetero-junction ; Improved luminescence ; Europium
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：176
• 期：Complete
• 页码：124-129
• 全文大小：943 K

文摘

In the present work it has been demonstrated that Eu doped ZnO–SnO₂ nanocomposite shows enhanced photoluminescence in comparison to individual ZnO:Eu or SnO₂:Eu. Luminescence studies have confirmed that Eu³⁺ ions mainly occupy Sn⁴⁺ sites in the SnO₂ part of the composite. Hetero-junction assisted energy transfer from ZnO to SnO₂:Eu³⁺ has been assigned as the reason for this relative improvement in luminescence behavior. Based on the X-ray diffraction nuclear magnetic resonance studies it is confirmed that at higher annealing temperature, Zn₂SnO₄ phase forming at the interface of SnO₂ and ZnO prevents the energy transfer between ZnO and SnO₂:Eu and thereby decreases photoluminescence intensity. Deterrent of ZnO and SnO₂ interaction via silica dispersion of nanocomposite resulted in deterioration of luminescence properties further reaffirms the role of ZnO:SnO₂ hetero-junction.