Transparent, conductive, and flexible carbon nanotube films and their application in organic light-emitting diodes.
We have carried out comparative studies on transparent conductive thin films made with two kinds of commercial carbon nanotubes: HiPCO and arc-discharge nanotubes. These films have been further exploited as hole-injection electrodes for organic light-emitting diodes (OLEDs) on both rigid glass and flexible substrates. Our experiments reveal that films based on arc-discharge nanotubes are overwhelmingly better than HiPCO-nanotube-based films in all of the critical aspects, including surface roughness, sheet resistance, and transparency. Further improvement in arc-discharge nanotube films has been achieved by using PEDOT passivation for better surface smoothness and using SOCl2 doping for lower sheet resistance. The optimized films show a typical sheet resistance of approximately 160 Omega/ square at 87% transparency and have been used successfully to make OLEDs with high stabilities and long lifetimes.
Zhang
Daihua
D
Department of E.E.-Electrophysics, University of Southern California, Los Angeles, California 90089, USA.
Ryu
Koungmin
K
Liu
Xiaolei
X
Polikarpov
Evgueni
E
Ly
James
J
Tompson
Mark E
ME
Zhou
Chongwu
C
D004548:Elasticity; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D008422:Materials Testing; D008567:Membranes, Artificial; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D009930:Organic Chemicals / Q000737:chemistry; D012666:Semiconductors
D008567:Membranes, Artificial; D037742:Nanotubes, Carbon; D009930:Organic Chemicals