Phosphors used in CRTs have been coated with In
2O
3 conductive layer derived from the hydrolysis of indium chloride. It was found that brightness of the phosphors rises initially with the amount of ...InCl
3, reaches a maximum at 10
wt.% InCl
3 and then decreases when more InCl
3 was added. With 10
wt.% InCl
3 coating, the brightness of ZnS:Cu, Al phosphor increases by 24% at 800
V and 1
μA while very little changes were observed in the luminescent emission peak and CIE color loci. The luminescence decay times increase with the increase of the conductive coating. However, they are shorter than 0.7
μs for samples with the amount of coating ranging from 0 to 20
wt.% InCl
3 and are suitable for display applications. Conductive coating affects the surface chemistry of the phosphor particles, enhances the zeta potential of ZnS:Cu, Al in IPA solution, and, consequently, increases the electrophoretic deposition rate of the phosphors onto substrate. The zeta potential of 10
wt.% InCl
3 coated ZnS:Cu, Al in isopropyl alcohol solution is 32
mV as compared to 1.2
mV of that of the uncoated ZnS:Cu, Al. Besides, the electrophoretic deposition rate of the 10
wt.% InCl
3 coated ZnS:Cu, Al (0.23
mg/s) is larger than that of the uncoated phosphor (0.17
mg/s).
碩士
國防大學理工學院
電子工程碩士班
99
ABSTRACT
Two L-shaped printed slot antennas of broadband and dual-band circular- polarization operations are proposed in this thesis. The main features of the broad band ...circular polarized (CP) printed slot antenna are an L-shaped slot and a pair of inverted L-shaped corner slits. In this design, a higher CP frequency band created by a pair of inverted L-shaped corner slits and a lower CP frequency band created by a pair of inverted L-shaped corner slits can be combined to from a wide CP bandwidth of larger than 40 %. The main features of the dual-band CP printed slot antenna are an embedded slot into the feeding signal line and a pair of inverted L-shaped slits at two corners of L-slot. The lower CP frequency band is created by the original L-shaped slot. The embedded slot is employed to create a first high-frequency CP band, while a pair of inverted L-shaped corner slits to create a second higher-frequency CP band. The two high-frequency CP band can be integrated to a CP band. The CP
PDF
