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.

Low driving voltage in an organic light-emitting diode using MoO 3 /NPB multiple quantum well structure in a hole transport layer * Mu Xue(穆 雪) a) , Wu Xiao-Ming(吴晓明) a) † , Hua Yu-Lin(华玉林) a) , Jiao Zhi-Qiang(焦志强) a) , Shen Li-Ying(申利莹) a) , Su Yue-Ju(苏跃举) a) , Bai Juan-Juan(白娟娟) a) , Bi Wen-Tao(毕文涛) a) , Yin Shou-Gen(印寿根) a) , and Zheng Jia-Jin(郑加金) b)

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Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region * Bai Juan-Juan(白娟娟) a) , Wu Xiao-Ming(吴晓明) a) † , Hua Yu-Lin(华玉林) a) ‡ , Mu Xue(穆 雪) a) , Bi Wen-Tao(毕文涛) a) , Su Yue-Ju(苏跃举) a) , Jiao Zhi-Qiang(焦志强) a) , Shen Li-Ying(申利莹) a) , Yin Shou-Gen(印寿根) a) , and Zheng Jia-Jin(郑加金) b) a)

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In this study the performance of organic light-emitting diodes (OLEDs) are enhanced significantly, which is based on dual electron transporting layers (Bphen/CuPc). By adjusting the thicknesses of Bphen and CuPc, the maximal luminescence, the maximal current efficiency, and the maximal power efficiency of the device reach 17570 cd/m2 at 11 V, and 5.39 cd/A and 3.39 lm/W at 3.37 mA/cm2 respectively, which are enhanced approximately by 33.4%, 39.3%, and 68.9%, respectively, compared with those of the device using Bphen only for an electron transporting layer. These results may provide some valuable references for improving the electron injection and the transportation of OLED.

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