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Issue 18, 2012
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LaOF : Eu3+ nanocrystals: hydrothermal synthesis, white and color-tuning emission properties

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Abstract

Uniform LaOF and LaOF : Eu3+ nanocrystals of the γ-form have been successfully synthesized under mild conditions via a facile hydrothermal method followed a heat treatment of their bastnaesite-type precursor (LaCO3F). The synthetic details, investigations into the phase purity and the presence of the oxocarbonate anion CO32– proven by IR measurements and EDX, as well as X-ray powder diffraction data, are given. Photoluminescence (PL) and cathodoluminescence (CL) spectra were utilized to characterize the luminescence properties of the LaCO3F : Eu3+ and LaOF : Eu3+ samples. Under ultraviolet light excitation, the LaCO3F : Eu3+ precursor shows an orange emission of Eu3+ (dominated by 5D07F1), while the product of heat treatment, LaOF : Eu3+, shows the characteristic emissions of Eu3+ (5DJ7FJJ, J′ = 0, 1, 2, 3 transitions). Under the excitation of UV and low-voltage electron beams, the emission color (including white) of LaOF : Eu3+ can be tuned by adjusting the doping concentration of Eu3+. The corresponding luminescence mechanisms have been discussed in detail.

Graphical abstract: LaOF : Eu3+ nanocrystals: hydrothermal synthesis, white and color-tuning emission properties

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Publication details

The article was received on 12 Jan 2012, accepted on 15 Feb 2012 and first published on 14 Mar 2012


Article type: Paper
DOI: 10.1039/C2DT30082F
Citation: Dalton Trans., 2012,41, 5571-5580
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    LaOF : Eu3+ nanocrystals: hydrothermal synthesis, white and color-tuning emission properties

    M. Shang, G. Li, X. Kang, D. Yang, D. Geng, C. Peng, Z. Cheng, H. Lian and J. Lin, Dalton Trans., 2012, 41, 5571
    DOI: 10.1039/C2DT30082F

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