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Enhanced emission of encaged-OH-free Ca12(1−x)Sr12xAl14O33:0.1%Gd3+ conductive phosphors via tuning the encaged-electron concentration for low-voltage FEDs

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Abstract

Encaged-OH-free Ca12(1−x)Sr12xAl14O33:0.1%Gd3+ conductive phosphors were prepared through a melt-solidification process in combination with a subsequent heat treatment. Absorption spectra showed that the maximum encaged-electron concentration was increased to 1.08 × 1021 cm−3 through optimizing the doping amount of Sr2+ (x = 0.005). Meanwhile, FTIR and Raman spectra indicated that pure Ca11.94Sr0.06Al14O33:0.1%Gd3+ conductive phosphor without encaged OH and C22− anions was acquired. For the conductive powders heat-treated in air for different times, the encaged-electron concentrations were tuned from 1.02 × 1021 to 8.3 × 1020 cm−3. ESR, photoluminescence, and luminescence kinetics analyses indicated that the emission at 312 nm mainly originated from Gd3+ ions surrounded by encaged O2− anions, while Gd3+ ions surrounded by encaged electrons had a negative contribution to the UV emission due to the existence of an energy transfer process. Under low-voltage electron-beam excitation (3 kV), enhanced cathodoluminescence (CL) of the conductive phosphors could be achieved by tuning the encaged-electron concentrations. In particular, for the encaged-OH-free conductive phosphor, the emission intensity of the CL was about one order of magnitude higher than that of the conductive phosphor containing encaged OH anions. Our results suggested that the encaged-OH-free conductive phosphors have potential application in low-voltage FEDs.

Graphical abstract: Enhanced emission of encaged-OH−-free Ca12(1−x)Sr12xAl14O33:0.1%Gd3+ conductive phosphors via tuning the encaged-electron concentration for low-voltage FEDs

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Publication details

The article was received on 17 Feb 2017, accepted on 13 Mar 2017 and first published on 15 Mar 2017


Article type: Paper
DOI: 10.1039/C7CP01064H
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Enhanced emission of encaged-OH-free Ca12(1−x)Sr12xAl14O33:0.1%Gd3+ conductive phosphors via tuning the encaged-electron concentration for low-voltage FEDs

    M. Zhang, Y. Liu, J. Yang, H. Zhu, D. Yan, X. Zhang, C. Liu, C. Xu and H. Zhang, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP01064H

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