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Issue 10, 2012
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Nanocrystalline CaYAlO4:Tb3+/Eu3+ as promising phosphors for full-color field emission displays

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Abstract

Eu3+ and/or Tb3+-doped CaYAlO4 phosphor samples were synthesized by Pechini-type sol–gel method. X-Ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), photoluminescence (PL) and cathodoluminescence (CL) spectra were used to characterize the samples. For CaYAlO4:Tb3+, it is shown that the Tb3+-doping concentration has a significant effect on the 5D3/5D4 emission intensity of Tb3+, which is attributed to the cross relaxation from 5D3 to 5D4. Under the 4f8 → 4f75d excitation of Tb3+ or low-voltage electron beams excitation, the CaYAlO4:Tb3+ phosphors show tunable luminescence from blue to cyan, and then to green with the change of Tb3+-doping concentration. The CaYAlO4:Eu3+ samples exhibit a reddish-orange emission of Eu3+ corresponding to 5D0,17F0,1,2,3 transitions. Furthermore, a white emission can be realized in the single phase CaYAlO4 host by reasonably adjusting the doping concentrations of Tb3+ and Eu3+ under low-voltage electron beams excitation. Compared with the commercial blue (Y2SiO5:Ce3+) and green (ZnO:Zn) phosphors, CaYAlO4:0.1%Tb3+ and CaYAlO4:5%Tb3+ phosphors have higher CL intensity and stability under continuous electron bombardment. Due to the excellent CL properties and good CIE chromaticity coordinates, the as-prepared Tb3+/Eu3+-doped CaYAlO4 nanocrystalline phosphors have potential application in FEDs devices.

Graphical abstract: Nanocrystalline CaYAlO4:Tb3+/Eu3+ as promising phosphors for full-color field emission displays

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Publication details

The article was received on 20 Nov 2011, accepted on 03 Jan 2012 and first published on 27 Jan 2012


Article type: Paper
DOI: 10.1039/C2DT12222G
Citation: Dalton Trans., 2012,41, 3078-3086
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    Nanocrystalline CaYAlO4:Tb3+/Eu3+ as promising phosphors for full-color field emission displays

    D. Geng, G. Li, M. Shang, C. Peng, Y. Zhang, Z. Cheng and J. Lin, Dalton Trans., 2012, 41, 3078
    DOI: 10.1039/C2DT12222G

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