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Size-dependent microstructure and europium site preference influence fluorescent properties of Eu3+-doped Ca10(PO4)6(OH)2 nanocrystal

Citation

Long, M and Hong, F and Li, W and Li, F and Zhao, H and Lv, Y and Li, H and Hu, F and Sun, L and Yan, C and Wei, Z, Size-dependent microstructure and europium site preference influence fluorescent properties of Eu3+-doped Ca10(PO4)6(OH)2 nanocrystal, Journal of Luminescence, 128, (3) pp. 428-436. ISSN 0022-2313 (2008) [Refereed Article]

Copyright Statement

Copyright 2007 Elsevier B.V.

DOI: doi:10.1016/j.jlumin.2007.09.012

Abstract

In this study, Eu3+-doped nanocrystalline Ca10(PO4)6(OH)2 (Ca10−xEux(PO4)6(OH)2) with different particle sizes have been prepared by the thermal decomposition of precursors. Size-dependent microstructure could be observed in nanocrystalline Ca10−xEux(PO4)6(OH)2. The lattices of Ca10−xEux(PO4)6(OH)2 nanocrystals were more distorted in comparison with the bulk, and the smaller the particle size, the more distorted the lattices. Room temperature photoluminescence showed europium site preference was also size-dependent, with the majority of Eu3+ ions occupying Ca(II) sites in the bulk, but more and more Eu3+ ions occupying Ca(I) sites in Ca10−xEux(PO4)6(OH)2 with decreasing particle size. Fluorescent properties of Ca10−xEux(PO4)6(OH)2 were considered to be influenced by both microstructure and site preference of Eu3+ ions. An abnormal strong intensity of 5D07F0 transition was observed in bulk and larger Ca10−xEux(PO4)6(OH)2 nanocrystals, but the relative intensities of 5D07F0 transition to 5D07F1,2,3,4 transition of Eu3+ became weaker as the particle sizes decreased. As the particle sizes became smaller, the ratios of the red emission transition (5D07F2) to the orange emission transition (5D07F1) (R/O values) first increased by comparing the bulk sample with 96 nm sample, and then decreased by comparing 96 nm sample to 57 nm sample. The quenching concentrations of Ca10−xEux(PO4)6(OH)2 samples increased with decreasing particle size. Possible mechanisms responsible for these phenomena were proposed. Since nanosized Ca10−xEux(PO4)6(OH)2 showed higher fluorescent intensities, higher R/O values and higher quenching concentrations, this material is considered to be a promising phosphor.

Item Details

Item Type:Refereed Article
Keywords:nanostructure, Eu ions, hydroxyapatite, fluorescence
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Wei, Z (Professor Zhenggui Wei)
ID Code:91147
Year Published:2008
Web of Science® Times Cited:39
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2014-05-09
Last Modified:2014-06-12
Downloads:0

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