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Photoluminescence properties of Y_(0.75-x)Gd_xAl_(0.10)BO_3:Eu_(0.10)~(3+),0.05R~(3+)(R= Sc,Bi) (0.00 ≤ x ≤ 0.45) 下载免费PDF全文
Y 0.75 -x Gd x Al 0.10 BO 3 :Eu0.10 3+, 0.05R 3+ (R=Sc, Bi) (0.00 ≤ x ≤ 0.45) powder samples are prepared by solid-state reaction and their luminescence properties are investigated. With the replacement of Y 3+ ions by Sc 3+ (or Bi 3+ ) and Gd 3+ ions in (Y,Al)BO 3 :Eu, the intensities of emission at 254 and 147 nm are remarkably improved, because Sc 3+ ions can absorb UV light and transfer the energy to Eu 3+ ions efficiently. Moreover, Gd 3+ and Bi 3+ ions act as an intermediate "bridge" between the sensitizer and the activator (Eu 3+ ) in energy transfer to produce light in the (Y, Gd)BO 3 :Bi 3+ , Eu 3+ system more effectively. After doping an appropriate concentration of Gd 3+ into Y 0.50 Gd 0.25 Al 0.10 BO 3 :Eu0.01 3+ , Bi0.05 3+ , the emission intensity reaches its maximum, which is nearly 110% compared with the red commercial phosphor (Y,Gd)BO 3 :Eu and better chromaticity coordinates (0.650, 0.350) are obtained. 相似文献
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This paper reports that the green phosphor BaAl11.9O19:0.1Mn2+ is prepared by a flux assisted solid state reaction method.The effect of flux systems on the crystal structure,morphology and luminescent properties of the phosphor are studied in detail.The samples are characterized by the application of x-ray diffraction patterns,scanning electron microscopy patterns,luminescent spectra and decay curves.The results show that a pure phase BaAl12O19 can be achieved at the firing temperature above 1300℃ by adding the proper flux system,the firing temperature is reduced at least 200℃ in comparison with the conventional solid state reaction method.Maximum photoluminescence emission intensity is observed at 517 nm for(AlF3+Li2CO3) flux system under vacuum ultraviolet region(147 nm) excitation.The photoluminescence emission intensity and the decay time of these phosphor is found to be more superior to that of the corresponding sample prepared by the conventional solid state reaction method implying the suitability of this route for the preparation of display device worthy phosphor materials. 相似文献
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Photoluminescence properties of Y0.75-xGdxAl0.10BO3:Eu3+0.10, 0.05R3+ (R= Sc, Bi) (0.00≤x≤0.45) 下载免费PDF全文
Y$_{0.75 -
x}$GdxAl0.10BO$3:Eu$^{3+}0.10, 0.05R3+
($R$=Sc, Bi) ($0.00 ≤ x ≤ 0.45$) powder samples are prepared
by solid-state reaction and their luminescence properties are
investigated. With the replacement of Y3+$ ions by Sc3+$
(or Bi3+)$ and Gd3+$ ions in (Y,Al)BO$3:Eu, the
intensities of emission at 254 and 147~nm are remarkably improved,
because Sc3+$ ions can absorb UV light and transfer the energy
to Eu3+$ ions efficiently. Moreover, Gd3+$ and Bi$^{3 +
}$ ions act as an intermediate ``bridge' between the sensitizer and
the activator (Eu3+)$ in energy transfer to produce light in
the (Y, Gd)BO$3:Bi3+$, Eu3+$ system more effectively.
After doping an appropriate concentration of Gd3+$ into
Y$_{0.50}$Gd$_{0.25}$Al0.10BO$3:Eu3+_{0.01}$,
Bi$^{3+}_{0.05}$, the emission intensity reaches its maximum, which
is nearly 110{\%} compared with the red commercial phosphor
(Y,Gd)BO$3:Eu and better chromaticity coordinates (0.650, 0.350)
are obtained. 相似文献
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