Host-sensitized luminescence of Dy{sup 3+}, Pr{sup 3+}, Tb{sup 3+} in polycrystalline CaIn{sub 2}O{sub 4} for field emission displays
- Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)
CaIn{sub 2}O{sub 4}:Dy{sup 3+}/Pr{sup 3+}/Tb{sup 3+} blue-white/green/green phosphors were prepared by the Pechini sol-gel process. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), diffuse reflectance, photoluminescence (PL) and cathodoluminescence (CL) spectra as well as lifetimes were utilized to characterize the samples. The XRD results reveal that the samples begin to crystallize at 800 deg. C and pure CaIn{sub 2}O{sub 4} phase can be obtained after annealing at 900 deg. C. The FE-SEM images indicate that the CaIn{sub 2}O{sub 4}:Dy{sup 3+}, CaIn{sub 2}O{sub 4}:Pr{sup 3+} and CaIn{sub 2}O{sub 4}:Tb{sup 3+} samples consist of spherical grains with size around 200-400 nm. Under the excitation of ultraviolet light and low-voltage electron beams (1-5 kV), the CaIn{sub 2}O{sub 4}:Dy{sup 3+}, CaIn{sub 2}O{sub 4}:Pr{sup 3+} and CaIn{sub 2}O{sub 4}:Tb{sup 3+} phosphors show the characteristic emissions of Dy{sup 3+} ({sup 4}F{sub 9/2}-{sup 6}H{sub 15/2} and {sup 4}F{sub 9/2}-{sup 6}H{sub 13/2} transitions, blue-white), Pr{sup 3+} ({sup 3}P{sub 0}-{sup 3}H{sub 4}, {sup 1}D{sub 2}-{sup 3}H{sub 4} and {sup 3}P{sub 1}-{sup 3}H{sub 5} transitions, green) and Tb{sup 3+} ({sup 5}D{sub 4}-{sup 7}F{sub 6,5,4,3} transitions, green), respectively. All the luminescence is resulted from an efficient energy transfer from the CaIn{sub 2}O{sub 4} host lattice to the doped Dy{sup 3+}, Pr{sup 3+} and Tb{sup 3+} ions, and the corresponding luminescence mechanisms have been proposed. - Graphical abstract: The CaIn{sub 2}O{sub 4}:Dy{sup 3+}/Pr{sup 3+}/Tb{sup 3+} blue-white/green/green phosphors were prepared by the Pechini sol-gel process. Under the excitation of ultraviolet light and low-voltage electron beams (1-5 kV), the CaIn{sub 2}O{sub 4}:Dy{sup 3+}, CaIn{sub 2}O{sub 4}:Pr{sup 3+} and CaIn{sub 2}O{sub 4}:Tb{sup 3+} phosphors show the characteristic emissions of Dy{sup 3+} ({sup 4}F{sub 9/2}-{sup 6}H{sub 15/2} and {sup 4}F{sub 9/2}-{sup 6}H{sub 13/2} transitions, blue-white), Pr{sup 3+} ({sup 3}P{sub 0}-{sup 3}H{sub 4}, {sup 1}D{sub 2}-{sup 3}H{sub 4} and {sup 3}P{sub 1}-{sup 3}H{sub 5} transitions, green) and Tb{sup 3+} ({sup 5}D{sub 4}-{sup 7}F{sub 6,5,4,3} transitions, green), respectively. All the luminescence is resulted from an efficient energy transfer from the CaIn{sub 2}O{sub 4} host lattice to the doped Dy{sup 3+}, Pr{sup 3+} and Tb{sup 3+} ions.
- OSTI ID:
- 21015792
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 4; Other Information: DOI: 10.1016/j.jssc.2007.01.034; PII: S0022-4596(07)00067-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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