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Issue 3, 2011
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Controllable and white upconversion luminescence in BaYF5:Ln3+ (Ln = Yb, Er, Tm) nanocrystals

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Abstract

BaYF5:Yb3+, Er3+, Tm3+ nanocrystals have been successfully synthesized via a hydrothermal process. SEM and TEM images indicate that the size of the nanocrystals is about 20 nm. Under the excitation of a 980 nm single-wavelength diode laser, BaYF5:Er3+ nanocrystals give strong green upconversion (UC) emission centered at 523 and 541 nm, which is assigned to 2H11/24I15/2 and 4S3/24I15/2 transitions of Er3+, respectively. When Yb3+ is codoped in BaYF5:Er3+, red emission around 652 nm can be observed in the emission spectrum. This emission can be assigned to the 4F9/24I15/2 transition of Er3+. The intensity ratio of the green luminescence to the red luminescence decreases with increasing Yb3+ concentration in BaYF5:Yb3+, Er3+ nanocrystals. The blue UC emissions of BaYF5:Yb3+, Tm3+ nanocrystals appeared near 464 and 480 nm and are assigned to the 1D23F4 and 1G43H6 transitions of Tm3+, respectively. Based on the generation of red, green, and blue emissions, the BaYF5:Yb3+, Er3+, Tm3+ nanocrystals can produce different colors, including white, by controlling the doping concentration of Yb3+ in the BaYF5 nanocrystals. The BaYF5:40%Yb3+, 0.5%Er3+, 0.5%Tm3+nanocrystals show proper intensities of blue, green, and red emissions, which result in the production of white light (CIE: x = 0.346, y = 0.336).

Graphical abstract: Controllable and white upconversion luminescence in BaYF5:Ln3+ (Ln = Yb, Er, Tm) nanocrystals

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Publication details

The article was received on 05 Sep 2010, accepted on 30 Sep 2010 and first published on 10 Nov 2010


Article type: Paper
DOI: 10.1039/C0JM02948C
J. Mater. Chem., 2011,21, 717-723

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    Controllable and white upconversion luminescence in BaYF5:Ln3+ (Ln = Yb, Er, Tm) nanocrystals

    C. Zhang, P. A. Ma, C. Li, G. Li, S. Huang, D. Yang, M. Shang, X. Kang and J. Lin, J. Mater. Chem., 2011, 21, 717
    DOI: 10.1039/C0JM02948C

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