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19 Nov 2007

Volume 91, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 91, 212501 (2007); http://dx.doi.org/10.1063/1.2813047 (3 pages)

M. V. Milošević, G. R. Berdiyorov, and F. M. Peeters
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Enhanced circular dichroism via slow light in dispersive structured media

Jesper Pedersen and Niels Asger Mortensen

Appl. Phys. Lett. 91, 213501 (2007); http://dx.doi.org/10.1063/1.2814937 (3 pages) | Cited 4 times

Online Publication Date: 19 November 2007

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Circular dichroism (CD) is in widespread use as a means of determining enantiomeric excess. We show how slow-light phenomena in dispersive structured media allow for a reduction in the required optical path length of an order of magnitude. The same ideas may be used to enhance the sensitivity of CD measurements while maintaining the same optical path length through the sample. Finally, the sensitivity may be enhanced in frequency regimes where CD data are typically not accessible due to a modest chiral response of the enantiomers.
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78.20.Fm Birefringence

Efficient white-light-emitting diodes based on polyfluorene doped with fluorescent chromophores

Suqin Fan, Mingliang Sun, Jian Wang, Wei Yang, and Yong Cao

Appl. Phys. Lett. 91, 213502 (2007); http://dx.doi.org/10.1063/1.2812569 (3 pages) | Cited 11 times

Online Publication Date: 21 November 2007

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Orange-red emitting small molecule chromorephores, 4,7-di-2-thienyl-2,1,3-benzothiadiazole, 4,7-(2′-diselenophenyl)-2,1,3-benzothiadiazole, and 4,7-bis(N-methylpyrrol-2-yl)-2,1,3-benzo-thiadiazole were synthesized and used for fabrication of fluorescent white-emitting device with polyfluorene (PFO) as host by solution processing. By careful controlling of dopant concentration, balanced narrow band-gap (NGB) electroluminescence (EL) emission can be obtained by solution processing due to the incomplete energy transfer from PFO to narrow band gap molecules. EL spectra of the obtained devices were very stable at a wide range of operating voltage. The best white-emitting device reached luminous efficiency of 7.54 cd/A with the CIE coordinates (0.33, 0.34) at luminance over 1000 cd/m2.
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85.60.Jb Light-emitting devices
85.60.Bt Optoelectronic device characterization, design, and modeling
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