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2 Jul 2012

Volume 101, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 101, 013701 (2012); http://dx.doi.org/10.1063/1.4730945 (5 pages)

Frederick Gertz, Rustam Azimov, and Alexander Khitun
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Efficiency enhancement utilizing hybrid charge generation layer in tandem organic light-emitting diodes

J. Xiao, X. X. Wang, H. Zhu, X. Gao, Z. H. Yang, X. H. Zhang, and S. D. Wang

Appl. Phys. Lett. 101, 013301 (2012); http://dx.doi.org/10.1063/1.4732505 (4 pages) | Cited 4 times

Online Publication Date: 2 July 2012

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We report the incorporation of lithium fluoride doped 4,7-diphenyl-1,10-phenanthroline, Al, and molybdenum trioxide which is utilized to form the charge generation layer in tandem organic light-emitting diodes. Both the fluorescent and phosphorescent tandem devices based on this hybrid charge generation layer show the enhanced luminous efficiency and reduced operating voltage compared with the devices using conventional charge generation layer. The mechanism of the efficiency enhancement is ascribed to the improvement of charge balance due to the efficient charge separation in the hybrid charge generation layer. The hybrid layer can act as the effective charge injection buffer layer as well.
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85.60.Jb Light-emitting devices
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Hall-effect mobility of pentacene films prepared by the thermal evaporating method with different substrate temperature

Yow-Jon Lin (林祐仲), Hou-Yen Tsao (曹侯焱), and Day-Shan Liu (劉代山)

Appl. Phys. Lett. 101, 013302 (2012); http://dx.doi.org/10.1063/1.4733293 (3 pages) | Cited 1 time

Online Publication Date: 3 July 2012

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We studied the Hall-effect mobility of pentacene films prepared by the thermal evaporating method with different substrate temperature. A crossover from coherent bandlike charge transport with mobilities up to several tens of cm2/V-s at low temperature to an incoherent hopping motion at high temperature is observed. The carrier mobilities of pentacene exhibit a hopping-to-band transition around room temperature. An exhibition of high mobility of pentacene films prepared with substrate temperature of 90 °C is attributed to the increased spacing between molecules.
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73.61.Ph Polymers; organic compounds
68.55.ag Semiconductors
81.15.Dj E-beam and hot filament evaporation deposition
72.20.Ee Mobility edges; hopping transport
72.60.+g Mixed conductivity and conductivity transitions
73.50.Dn Low-field transport and mobility; piezoresistance
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Operational lifetime improvement of poly(9,9-dioctylfluorene) active waveguides by thermal lamination

M. Anni

Appl. Phys. Lett. 101, 013303 (2012); http://dx.doi.org/10.1063/1.4733325 (4 pages)

Online Publication Date: 3 July 2012

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We investigate the encapsulation performances of polyethylene terephthalate-poly (ethylene vinyl acetate) laminating pouches, thermally laminated on flexible poly(9,9-dioctylfluorene)(PF8) active waveguides showing amplified spontaneous emission (ASE). We show that the lamination process does not cause significant degradation of the PF8 emission properties and preserves the ASE properties of the waveguide, with an ASE threshold increase of only 15%. A clear increase of the ASE operational lifetime up to 2.3 times is observed after lamination, together with stable ASE threshold for more than 6 months after the device realization, thus proposing thermal lamination as a straightforward technique to encapsulate organic active waveguides, preserving the possibility to realize flexible devices.
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42.79.Gn Optical waveguides and couplers
42.70.Jk Polymers and organics
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