Effect of Lu2O3 Coating on Structural and Luminescent Properties of Y2O3:Eu3+ Nanoparticles
The construction of core–shell nanostructures is a common strategy to improve the luminescent efficiency of nanophosphors. The core Y2O3:Eu3+ and the core–shell Y2O3:Eu3+@Lu2O3 nanoparticles
with different shell thickness were prepared by homogeneous precipitation method. X-ray diffraction patterns and scanning electron microscopy images demonstrate that all the as-prepared samples crystallize in cubic phase with spherical shape and the mean size of the core is about 65 nm. Energy-dispersive
X-ray spectrum provides evidence for the growth of Lu2O3 shell around the core Y2O3:Eu3+. The effect of the shell Lu2O3 on the luminescence properties of Y2O3:Eu3+ was discussed in
detail. In comparison to the bare core, the emission intensities for the core–shell Y2O3:Eu3+@ Lu2O3 nanoparticles are enhanced when the molar ratio Y3+:Lu3+ = 4:1, 2:1, 1:1, indicating that the shell with proper
thickness minimizes surface quenching induced emission loss. But the emission intensity decreases when the shell thickness is further increased, resulting from the reduction of Eu3+ concentration. The decay time of Eu3+
5D0 state increases with the
increase of the shell thickness. The enhanced luminescence intensity and lifetime will be achieved by coating the nanoparticles with a shell in similar structure and with proper thickness.
Keywords: Core–Shell Formation; Luminescence; Nanoparticles; Y2O3:Eu3+
Document Type: Research Article
Affiliations: Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China
Publication date: 01 November 2018
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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