Lee, C. W., Chou, C. H., Huang, J. H., Hsu, C. S. & Nguyen, T. P. (2008) Investigations of organic light emitting diodes with CdSe(ZnS) quantum dots. Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. 147 307–311.
Added by: Laurent Cournède (2016-03-10 21:58:42)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0921-5107
Clé BibTeX: Lee2008b
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Mots-clés: cadmium selenide, cdse, co-polymer, Composites, conjugated polymers, electroluminescence, nanocrystals, nanoparticles, organic light emitting diodes, quantum dots
Créateurs: Chou, Hsu, Huang, Lee, Nguyen
Collection: Mater. Sci. Eng. B-Solid State Mater. Adv. Technol.
Consultations : 1/400
Indice de consultation : 2%
Indice de popularité : 0.5%
In this study, we report results on investigation of bilayer light emitting diodes made of organic capped CdSe(ZnS) core/shell type nanocrystals and poly [2-phenyl-3-(9,9-dihexyl-fluoren-2-yl) phenylene vinylene]-co-[2-methoxy-5-(2'-ethylhexyloxy) phenylene vinylene] (FP-PPV-co-MEH-PPV) electroluminescent co-polymer. Light emitting diodes of structure: indium-tin-oxide (ITO)/polyethylene dioxythiophene: polystyrene sulfonate (PEDOT:PSS)/FP-PPV-co-MEH-PPV/Ca/Al devices have been fabricated and studied. The co-polymer device emits a yellow light with a maximum brightness of 3949 cd/m(2) and a maximum external quantum efficiency of 0.27 cd/A at 10 V. Incorporation of CdSe(ZnS) quantum dots into the active polymer film resulted in an increase in device brightness, which reached 8192 cd/m(2) and in external quantum efficiency, which became 1.27 cd/A at 7 V with a lower turn-on voltage. The results indicate that CdSe(ZnS) quantum dots improved significantly the emission of the devices by modifying the injection and transport of the charge carriers. We suggest a non-uniform dispersion of QDs in the co-polymer layer with carrier blocking process by the particles, which produced a balanced charge distribution inside the co-polymer, and thus increased the emission efficiency. (c) 2007 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède