Functionalized TiO2@ZrO2@Y2O3:Eu3+ core–multishell microspheres and their photoluminescence properties--颗粒学报PARTICUOLOGY

Sun, J., Gao, X., He, D., Chen, J., Meng, X., Zhang, Q., Shen, L., & Jiao, H. (2013). Functionalized TiO2@ZrO2@Y2O3:Eu3+ core–multishell microspheres and their photoluminescence properties. Particuology, 11(6), 776–781. https://doi.org/10.1016/j.partic.2013.03.001

Functionalized TiO₂@ZrO₂@Y₂O₃:Eu³⁺ core–multishell microspheres and their photoluminescence properties

Jiali Sun, Xuan Gao, Diping He, Juan Chen, Xin Meng, Qiao Zhang, Lili Shen, Huan Jiao^*

Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China

10.1016/j.partic.2013.03.001

Volume 11, Issue 6, December 2013, Pages 776-781

Received 9 July 2012, Revised 26 February 2013, Accepted 18 March 2013, Available online 29 May 2013.

E-mail: jiaohuan@snnu.edu.cn

Highlights

• TiO₂@ZrO₂@Y₂O₃:Eu³⁺ particles were synthesized via layer-by-layer self-assembly and sol–gel process.

• 14 nm thick ZrO₂ layer can obstruct effectively the reaction of TiO₂ core and Y₂O₃ shell.

• TiO₂@ZrO₂@Y₂O₃:Eu³⁺ particles annealed at 1000 °C exhibited strong red emission at 611 nm.

Abstract

TiO₂@ZrO₂@Y₂O₃:Eu³⁺ composite particles with a core–multishell structure were synthesized through the combination of a layer-by-layer (LBL) self-assembly method and a sol–gel process. The obtained samples were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and fluorescence spectrophotometry. The results showed that the composite particles had a core–multishell structure, spherical morphology, and a narrow size distribution. The presence of a ZrO₂ layer on the TiO₂ core can effectively prevent the reaction between the TiO₂ core and a Y₂O₃ shell; the temperature for the reaction between the TiO₂ core and the Y₂O₃ shell in the TiO₂@ZrO₂@Y₂O₃:Eu core–multishell phosphor can be elevated by 300 °C compared to that for TiO₂@Y₂O₃:Eu. Upon excitation of the core–multishell particles in the ultraviolet (254 nm), the Eu³⁺ ion in the Y₂O₃:Eu³⁺ shell shows its characteristic red emission (611 nm, ⁵D₀→⁷F₂), and the photoluminescence (PL) intensity of the phosphor with the core–multishell structure was obviously greater than that of the core–shell TiO₂@Y₂O₃:Eu phosphor.

Graphical abstract

Keywords

ZrO₂ interface; Red phosphors; Photoluminescence; Core–shell structure; Composite particles

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