Probing of surface Eu ions present in ZnO:Eu nanoparticles by covering ZnO:Eu core with Y<sub>2</sub>O<sub>3</sub> shell: Luminescence study期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Probing of surface Eu ions present in ZnO:Eu nanoparticles by covering ZnO:Eu core with Y₂O₃ shell: Luminescence study

Authors:	L. Robindro Singh V. Sudarsan S.K. Kulshreshtha

Affiliation:	^a Department of Physics, Manipur University, Canchipur 795003, India ^b Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India

Abstract:	Eu³⁺ doped ZnO nanoparticles are known to have significance extent of surface Eu³⁺ ions due to a large difference in ionic radii. Effect of such Eu³⁺ ions on the luminescence properties of ZnO:Eu nanoparticles has been understood from the luminescence studies of ZnO:Eu nanoparticles covered with Y₂O₃ shell. Based on the asymmetric ratio of luminescence and extent of energy transfer, it is established that when ZnO:Eu nanoparticles are covered with Y₂O₃ shell, a part of Eu³⁺ ions present with ZnO:Eu core migrate to Y₂O₃ shell and occupy Y³⁺ lattice positions.

Keywords:	Nanoparticles Energy transfer Charge transfer Core-shell Asymmetry ratio
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