title: 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.
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 × 1021cm-3through 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 × 1021to 8.3 × 1020cm-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.
authors.affiliation: School of Physics, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China. yxliu@nenu.edu.cn.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Yuxue
authors.initials: Y
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.forename: Hancheng
authors.initials: H
authors.lastname: Zhu
authors.forename: Duanting
authors.initials: D
authors.lastname: Yan
authors.forename: Xinyang
authors.initials: X
authors.lastname: Zhang
authors.forename: Chunguang
authors.initials: C
authors.lastname: Liu
authors.forename: Changshan
authors.initials: C
authors.lastname: Xu
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang