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14 Jan 2013

Volume 102, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 102, 023901 (2013); http://dx.doi.org/10.1063/1.4773526 (4 pages)

Yoshihiro Gohda and Shinji Tsuneyuki
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The charge-trapping and triplet-triplet annihilation processes in organic light-emitting diodes: A duty cycle dependence study on magneto-electroluminescence

Qiming Peng, Ping Chen, and Feng Li

Appl. Phys. Lett. 102, 023301 (2013); http://dx.doi.org/10.1063/1.4788681 (5 pages) | Cited 1 time

Online Publication Date: 17 January 2013

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We studied the magneto-electroluminescence (MEL) in tri-(8-hydroxyquinoline)-aluminum (Alq3)-based organic light-emitting devices through both steady-state and transient methods. As the magnetic field increases, the MEL exhibits a rapid rise, followed by the saturation tendency at all voltages in the steady-state measurement, but in the transient measurement it first increases to a maximum and then decreases to negative values when the driving voltages are higher than 8V. Furthermore, we found that the MEL strongly depends on the duty cycle of the pulse voltage. Finally, by employing the triplet-triplet annihilation model combined with the charge trapping effects, we explained the duty cycle dependence of MELs.
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85.60.Jb Light-emitting devices
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Hole injection enhancement by sparsely dispersed Au nanoparticles on indium tin oxide electrode in organic light emitting devices

D. Wang, K. Yasui, M. Ozawa, K. Odoi, S. Shimamura, and K. Fujita

Appl. Phys. Lett. 102, 023302 (2013); http://dx.doi.org/10.1063/1.4776664 (3 pages)

Online Publication Date: 17 January 2013

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Gold nanoparticles stabilized by a hyper-branched polystyrene and adhered sparsely on indium tin oxide electrode can enhance hole injection to hole transport layer of N,N′-diphenyl-N,N′-bis(1-naphthyl)(1,1′-biphenyl)-4,4′-diamine. Although surface coverage by nanoparticles is less than 1%, the current density increases almost 1.5 orders of magnitude in hole-only device compared with the identical device without nanoparticles. This nanoparticle is also applied in typical organic light emitting diode. The driving voltage can be significantly lowered accompany with almost six times higher current density and luminance at 6 V. The local electric field induced by negatively charged nanoparticles should bring about the hole injection enhancement.
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85.60.Jb Light-emitting devices
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Organic field-effect transistor nonvolatile memories based on hybrid nano-floating-gate

Xu Gao, Xiao-Jian She, Chang-Hai Liu, Qi-Jun Sun, Jie Liu, and Sui-Dong Wang

Appl. Phys. Lett. 102, 023303 (2013); http://dx.doi.org/10.1063/1.4776677 (4 pages)

Online Publication Date: 17 January 2013

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High performance organic field-effect transistor nonvolatile memory is achieved by integrating gold nanoparticles and graphene oxide sheets as the hybrid nano-floating-gate. The device shows a large memory window of about 40 V, high ON/OFF ratio of reading current over 104, excellent programming/erasing endurance, and retention ability. The hybrid nano-floating-gate can increase the density of charge trapping sites, which are electrically separate from each other and thus suppress the stored charge leakage. The memory window is increased under illumination, and the results indicate that the photon-generated carriers facilitate the electron trapping but have almost no effect on the hole trapping.
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84.30.Sk Pulse and digital circuits
85.30.Tv Field effect devices
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