期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 3, 页码 717-723出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm02948c
关键词
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资金
- National Basic Research Program of China [2007CB935502, 2010CB327704]
- National Natural Science Foundation of China (NSFC) [50702057, 50872131, 20921002]
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 H-2(11/2) -> I-4(15/2) and S-4(3/2) -> I-4(15/2) 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 F-4(9/2) -> I-4(15/2) 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 D-1(2) -> F-3(4) and (1)G(4) -> H-3(6) 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).
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