State Key Laboratory of Hollow Fiber Membrane Materials and Membrane Processing, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China.
Nanotechnology. 2013 Nov 1;24(43):435201. doi: 10.1088/0957-4484/24/43/435201. Epub 2013 Oct 2.
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.
单壁碳纳米管（SWCNT）透明导电薄膜（TCF）被制备为有机发光二极管（OLED）的电极；研究了三种类型的薄膜。所制备的 SWCNT TCF 的方阻在 80.7 T%时相对较低，为 82.6 Ω/sq，表面粗糙度相对较大，为 30nm。TCF 用聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）进行顶涂，得到 PEDOT：PSS 涂覆的 TCF。PEDOT：PSS 覆盖层提高了导电性，并降低了表面粗糙度至 12nm，但薄膜透光率降低。SWCNT TCF 与 PEDOT：PSS 混合（PM-TCF）表现出高导电性（81 T%时为 70.6 Ω/sq）和低表面粗糙度（3nm），因此被选为 OLED 最佳 TCF。在具有相同结构的 TCF 上制备了以 4,4'-双（2,2'-二苯基乙烯基）-1,1'-联苯（Dpvbi）为发射层的蓝色柔性 OLED，以评估不同类型的 SWCNT 薄膜在 OLED 中的应用性能。在这三种类型的 OLED 中，PM-TCF 器件表现出最佳性能，最大亮度为 2587cd/m²，电流效率为 5.44cd/A。使用场发射扫描电子显微镜和原子力显微镜进一步研究了将 SWCNT TCF 应用于 OLED 的机制，对这一结果进行了探讨。
