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23 Jul 2012

Volume 101, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 101, 043101 (2012); http://dx.doi.org/10.1063/1.4737152 (4 pages)

Toshiaki Tanigaki, Yoshikatsu Inada, Shinji Aizawa, Takahiro Suzuki, Hyun Soon Park, Tsuyoshi Matsuda, Akira Taniyama, Daisuke Shindo, and Akira Tonomura
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Triisopropylsilylethynyl-functionalized anthradithiophene derivatives for solution processable organic field effect transistors

K. Schulze, T. Bilkay, and S. Janietz

Appl. Phys. Lett. 101, 043301 (2012); http://dx.doi.org/10.1063/1.4739241 (4 pages) | Cited 2 times

Online Publication Date: 24 July 2012

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Two different solution processable anthradithiophenes were used as semiconductor material in top gate organic field effect transistors (OFETs) on flexible substrates. We observed good crystallization of the material in thin layers and determined charge carrier mobilities of up to 0.6 cm2/Vs. This value is only half of the mobility of the today best material triisopropylsilylethynyl-pentacene. Furthermore our OFETs show very good air stability over more than 20 months without significant changes of the mobility or on/off-ratio.
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85.30.Tv Field effect devices
81.05.Fb Organic semiconductors
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Influence of mobility on the dissociation probability of electron-hole pair in hopping system

Ling Li, Nianduan Lu, and Ming Liu

Appl. Phys. Lett. 101, 043302 (2012); http://dx.doi.org/10.1063/1.4737934 (3 pages)

Online Publication Date: 24 July 2012

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We propose a model to describe the dissociation probability of electron-hole pair in the presence of external field in the hopping systems. The influence of field dependent mobility on the dissociation probability has been extensively discussed. The results show that the field dependent mobility model has a major influence on the electron-hole dissociation probability. The application of the dissociation model has also been presented.
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72.20.Ee Mobility edges; hopping transport
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Effects of mixed host spatial distribution on the efficiency of blue phosphorescent organic light-emitting diodes

Sangmin Lee, Ching. W. Tang, and Lewis. J. Rothberg

Appl. Phys. Lett. 101, 043303 (2012); http://dx.doi.org/10.1063/1.4739499 (3 pages) | Cited 1 time

Online Publication Date: 27 July 2012

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We present a systematic study of how graded-host profile in the emissive layer (EML) affects the efficiency of blue phosphorescent organic light-emitting diodes. Three sets of devices with uniformly mixed and linearly graded mixed (LGM) hosts are fabricated with iridium-(III)-bis(4,6-difluorophenyl-pyridinato-N,C2) picolinate as dopant. By varying the position of the dopant within the emissive layer, we show that the LGM architecture improves device efficiency by moving the recombination zone further from the interface thereby reducing quenching due to interactions with charges in the transport layers.
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85.60.Jb Light-emitting devices
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