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Modification of carbon nanotube transparent conducting films for electrodes in organic light-emitting diodes

机译：用于有机发光二极管中电极的碳纳米管透明导电膜的改性

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Single-walled carbon nanotube (SWCNT) transparent conducting films (TCFs) were fabricated for the electrodes of organic light-emitting diodes (OLEDs); three types of film were studied. The as-prepared SWCNT TCFs displayed a relatively low sheet resistance of 82.6 Ω/sq at 80.7 T% with a relatively large surface roughness of 30 nm. The TCFs were top-coated with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) to obtain PEDOT:PSS-coated TCFs. The PEDOT:PSS cover improved the conductivity and decreased the surface roughness to 12 nm at the cost of film transmittance. The SWCNT TCFs mixed with PEDOT:PSS (PM-TCFs) exhibited a high conductivity (70.6 Ω/sq at 81 T%) and a low surface roughness (3 nm) and were thus selected as the best TCFs for OLEDs. Blue flexible OLEDs with 4,4′-bis(2,2′- diphenylvinyl)-1,1′-biphenyl (Dpvbi) as the emitting layer were fabricated on TCFs with the same structures to evaluate the performances of the different types of SWCNT films for use in OLEDs. Of these three types of OLEDs, the PM-TCF devices exhibited the optimal performance with a maximum luminance of 2587 cd m-2 and a current efficiency of 5.44 cd A-1. This result was explored using field-emission scanning electron microscopy and atomic force microscopy to further study the mechanisms that are involved in applying SWCNT TCFs to OLEDs.
机译：为有机发光二极管（OLED）的电极制作了单壁碳纳米管（SWCNT）透明导电膜（TCF）。研究了三种类型的胶卷。所制备的SWCNT TCF在80.7 T％时显示出相对较低的薄层电阻（82.6Ω/ sq）和相对较大的30 nm表面粗糙度。将TCF用聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）进行顶涂，以获得PEDOT：PSS涂覆的TCF。 PEDOT：PSS覆盖层提高了电导率，并将表面粗糙度降低至12 nm，但以薄膜透射率为代价。与PEDOT：PSS（PM-TCFs）混合的SWCNT TCF表现出高电导率（81 T％时为70.6Ω/ sq）和低表面粗糙度（3 nm），因此被选为OLED的最佳TCF。在具有相同结构的TCF上制造了以4,4'-双（2,2'-二苯基乙烯基）-1,1'-联苯（Dpvbi）作为发光层的蓝色柔性OLED，以评估不同类型的SWCNT的性能用于OLED的薄膜。在这三种类型的OLED中，PM-TCF器件具有最佳性能，其最大亮度为2587 cd m-2，电流效率为5.44 cd A-1。使用场发射扫描电子显微镜和原子力显微镜对这一结果进行了探索，以进一步研究将SWCNT TCF应用于OLED所涉及的机制。

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