Carbon nanotube transparent conducting films as electrodes for organic light-emitting diodes

Purified single-walled carbon nanotubes (SWCNTs) were dispersed in water using sodium dodecyl benzene sulfonate (SDBS) as dispersant for SWCNT transparent conducting films (TCFs). The optimal ratio of SWCNT/SDBS was found according to the film resistance of before and after post-treatment by nitric acid [1]. The TCFs were then further treated with thionyl chloride to improve their conductivity. Low sheet resistance and the high transmittance TCFs were achieved [2]. The TCFs were selected for electrodes of organic lightemitting diodes (OLEDs). The as prepared SWCNT-TCFs displayed a rather large surface roughness of 30 nm. The TCFs was top-coated with poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS) to achieve PEDOT:PSS coated TCFs and the surface roughness decreased to 12 nm. The SWCNT-TCFs mixed with PEDOT:PSS (PM-TCFs) achieving high conductivity, low surface roughness (3 nm). Flexible OLEDs were fabricated