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30 Jun 2008

Volume 92, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 92, 264101 (2008); http://dx.doi.org/10.1063/1.2951485 (3 pages)

Wei Xiang Jiang, Tie Jun Cui, Qiang Cheng, Jessie Yao Chin, Xin Mi Yang, Ruopeng Liu, and David R. Smith
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Efficient single layer solution-processed blue-emitting electrophosphorescent devices based on a small-molecule host

Liudong Hou, Lian Duan, Juan Qiao, Wei Li, Deqiang Zhang, and Yong Qiu

Appl. Phys. Lett. 92, 263301 (2008); http://dx.doi.org/10.1063/1.2952483 (3 pages) | Cited 31 times

Online Publication Date: 30 June 2008

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We report highly efficient single layer solution-processed blue small-molecule electrophosphorescent organic light-emitting diodes with iridium (III) bis[2-(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic) doped into a wide-gap 9,9-bis[4-(3 c6-di-tert-butylcarbazol-9-yl)phenyl]fluorene (TBCPF) as the emission layer. An optimized device with 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxidiazolyl]phenylene as the electron-transporting component doped into the emission layer, with a blue electrophosphorescence peaked at 474 nm from FIrpic, shows a maximum luminance efficiency of 12.7 cd/A at 190 A/m2 and brightness of 19 900 cd/m2 at 20 V. We attribute the high performance to the excellent film forming ability and high triplet energy of TBCPF.
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85.60.Jb Light-emitting devices
78.55.-m Photoluminescence, properties and materials
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Organic solar cells with solution-processed graphene transparent electrodes

Junbo Wu, Héctor A. Becerril, Zhenan Bao, Zunfeng Liu, Yongsheng Chen, and Peter Peumans

Appl. Phys. Lett. 92, 263302 (2008); http://dx.doi.org/10.1063/1.2924771 (3 pages) | Cited 196 times

Online Publication Date: 1 July 2008

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We demonstrate that solution-processed graphene thin films can serve as transparent conductive anodes for organic photovoltaic cells. The graphene electrodes were deposited on quartz substrates by spin coating of an aqueous dispersion of functionalized graphene, followed by a reduction process to reduce the sheet resistance. Small molecular weight organic solar cells can be directly deposited on such graphene anodes. The short-circuit current and fill factor of these devices on graphene are lower than those of control device on indium tin oxide due to the higher sheet resistance of the graphene films. We anticipate that further optimization of the reduction conditions will improve the performance of these graphene anodes.
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84.60.Jt Photoelectric conversion
82.45.Fk Electrodes
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Dependence of field-effect mobility and contact resistance on nanostructure in regioregular poly(3-hexylthiophene) thin film transistors

K. A. Singh, G. Sauvé, R. Zhang, T. Kowalewski, R. D. McCullough, and L. M. Porter

Appl. Phys. Lett. 92, 263303 (2008); http://dx.doi.org/10.1063/1.2955515 (3 pages) | Cited 10 times

Online Publication Date: 2 July 2008

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The mobility and contact resistance of transistors based on regioregular poly(3-hexylthiophene) (P3HT) with Ti/Pt electrodes were investigated as a function of the molecular weight (MW) of P3HT. For an increase in MW from 5.5 to 11 kDa, the mobility increased from 0.04 to 0.16 cm2 V−1 s−1, whereas the contact resistance decreased from 1.7 to 0.6 M Ω. Further increases in MW yielded an apparent saturation in both the mobility and the contact resistance. A nanofibrilar morphology was observed where the width of the nanofibrils increases with MW. A qualitative model based on polymer chain folding is proposed to explain the electrical results.
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85.30.Tv Field effect devices
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Theoretical investigation of the negative differential resistance in squashed C60 molecular device

Zhi-Qiang Fan, Ke-Qiu Chen, Qing Wan, B. S. Zou, Wenhui Duan, and Z. Shuai

Appl. Phys. Lett. 92, 263304 (2008); http://dx.doi.org/10.1063/1.2952493 (3 pages) | Cited 40 times

Online Publication Date: 2 July 2008

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By applying nonequilibrium Green’s function and first-principles calculation, we investigate the transport behavior of squashed C60 molecular devices. The results show that the electronic transport properties are affected obviously by the deformation of C60 molecule. Negative differential resistance is found in such system and can be tuned by the deformation degree of the molecule. A mechanism for the negative differential resistance behavior is suggested.
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72.80.Rj Fullerenes and related materials
72.20.Ht High-field and nonlinear effects
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Cesium hydroxide doped tris-(8-hydroxyquinoline) aluminum as an effective electron injection layer in inverted bottom-emission organic light emitting diodes

Tao Xiong, Fengxia Wang, Xianfeng Qiao, and Dongge Ma

Appl. Phys. Lett. 92, 263305 (2008); http://dx.doi.org/10.1063/1.2955516 (3 pages) | Cited 13 times

Online Publication Date: 3 July 2008

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We demonstrate highly efficient inverted bottom-emission organic light-emitting diodes (IBOLEDs) by using cesium hydroxide (CsOH) doped tris-(8-hydroxyquinoline) aluminum (Alq3) as the electron injection layer on indium tin oxide cathode, which could significantly enhance the electron injection, resulting in a large increase in luminance and efficiency. The maximum luminance, current efficiency, and power efficiency reach 21 000 cd/cm2, 6.5 cd/A, and 3.5 lm/W, respectively, which are 40%–50% higher in efficiency than that of IBOLEDs with cesium carbonate (Cs2CO3) doped Alq3 as the electron injection layer, where the efficiencies are only 4.5 cd/A and 2.2 lm/W. Our results indicate that CsOH doped Alq3 should be an effective electron injection layer on a wide range of electrodes to fabricate high performance OLEDs.
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85.60.Jb Light-emitting devices
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