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28 Jun 2010

Volume 96, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 96, 261101 (2010); http://dx.doi.org/10.1063/1.3456618 (3 pages)

I. V. Konoplev, L. Fisher, A. W. Cross, A. D. R. Phelps, K. Ronald, and C. W. Robertson
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Solvent-free, direct printing of organic semiconductors in atmosphere

Shaurjo Biswas, Kevin P. Pipe, and Max Shtein

Appl. Phys. Lett. 96, 263301 (2010); http://dx.doi.org/10.1063/1.3455840 (3 pages) | Cited 5 times

Online Publication Date: 28 June 2010

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Additive, solvent-free printing of molecular organic semiconductors in ambient atmosphere is demonstrated, by evaporating organic source material into nitrogen carrier gas, collimating and impinging it onto a substrate where the organic molecules condense. A surrounding annular guard flow focuses the primary jet and shields it from contact with the ambient oxygen and moisture, enabling device-quality deposits. As an example, electroluminescence efficiency of organic light emitting devices (OLEDS) with emissive layers printed in air is shown to increase with guard flow rate, attaining parity with all-vacuum thermally evaporated OLEDs.
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81.65.Cf Surface cleaning, etching, patterning
81.05.Fb Organic semiconductors
78.60.Fi Electroluminescence
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Light-emitting dendrimer film morphology: A neutron reflectivity study

S. V. Vickers, H. Barcena, K. A. Knights, R. K. Thomas, J.-C. Ribierre, S. Gambino, I. D. W. Samuel, P. L. Burn, and Giovanna Fragneto

Appl. Phys. Lett. 96, 263302 (2010); http://dx.doi.org/10.1063/1.3457438 (3 pages) | Cited 4 times

Online Publication Date: 29 June 2010

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We have used neutron reflectivity (NR) measurements to probe the physical structure of phosphorescent dendrimer films. The dendrimers consisted of fac-tris(2-phenylpyridyl)iridium(III) cores, biphenyl-based dendrons (first or second generation), and perdeuterated 2-ethylhexyloxy surface groups. We found that the shape and hydrodynamic radius of the dendrimer were both important factors in determining the packing density of the dendrimers. “Cone” shaped dendrimers were found to pack more effectively than “spherical” dendrimers even when the latter had a smaller radius. The morphology of the films determined by NR was consistent with the measured photoluminescence and charge transporting properties of the materials.
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85.60.Jb Light-emitting devices
78.55.Kz Solid organic materials
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Intense photoluminescence from pentacene monolayers

Rui He, Nancy G. Tassi, Graciela B. Blanchet, and Aron Pinczuk

Appl. Phys. Lett. 96, 263303 (2010); http://dx.doi.org/10.1063/1.3458816 (3 pages) | Cited 4 times

Online Publication Date: 30 June 2010

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Sharp and intense excitonic photoluminescence is observed at low temperatures in highly uniform pentacene monolayers deposited on a compliant polymeric substrate. The free exciton (FE) emission displays characteristic intensity that grows quadratically with the number of monolayers N. The energy of the FE band redshifts with increasing N revealing impact of molecular overlap on the FE state.
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78.66.Qn Polymers; organic compounds
71.35.-y Excitons and related phenomena
78.55.Kz Solid organic materials
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Surface-emitting dye-doped polymer laser coupled with stimulated resonant Raman scattering

Hisao Yanagi, Hidetaka Miyamoto, Atsushi Ishizumi, Satoshi Tomita, Kenichi Yamashita, and Kunishige Oe

Appl. Phys. Lett. 96, 263304 (2010); http://dx.doi.org/10.1063/1.3459967 (3 pages) | Cited 1 time

Online Publication Date: 1 July 2010

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Surface-emitting polymer laser was fabricated with 1,4-bis[2-[4-[N,N-di(p-totyl)amino]phenyl]vinyl]benzene-doped poly(vinyl-pyrrolidone) thin films sandwiched between two distributed Bragg reflector (DBR) mirrors. Under pulsed optical pumping, Fabry–Perot (FP) type resonation resulted in multi-mode laser oscillations depending upon the active film thickness. With increasing excitation wavelengths, an emission peak based on stimulated resonant Raman scattering (SRRS) was superimposed on the multimode band region. When the SRRS peak just overlapped with one of the FP modes, the emission intensity was enhanced and the line width was considerably narrowed. Such SRRS-coupled FP oscillations can be applied to realize a tunable single-mode surface-emitting polymer laser.
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42.55.Px Semiconductor lasers; laser diodes
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
78.66.Qn Polymers; organic compounds
78.40.Me Organic compounds and polymers
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