| Summary: | 碩士 === 義守大學 === 電子工程學系 === 102 === In this study, we deposit Ag nanoparticles (Ag NPs)-doped carbon nanotube (CNT) suspension on metal by spray technique to produce a high current density carbon nanotube field emission electron source substrate. Field emission organic light-emitting diodes (FEOLEDs) are fabricated by combining the CNT field emission electron source with organic light-emitting diodes (OLEDs), which demonstrate a higher luminous efficiency than OLEDs.
The study of a CNT field emission electron source substrate is to enhance the field emission characteristics. First, Cu, Ag or Al is evaporated on the glass substrate to form the cathode. Ag NPs-doped multi-walled carbon nanotubes (MWCNTs) are deposited onto cathodes by spray technique. Doping Ag NPs into CNTs can improve the conductivity of CNTs film to further enhance the field emission properties. Experimental results reveal that a current density of 62.5 mA/cm2 at 1.78 V/μm has been obtained when Cu is used as a cathode and 6.6 wt% Ag NPs is doped into CNTs. When the above electron emitting source used as a substrate combines an OLED device to form a FEOLED, the luminance intensity is enhanced from 5857 cd/m2 to 7386 cd/m2 and the luminous efficiency is enhanced from 9.327 cd/A to 11.76 cd/A.
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