Chih-Wen Lee et al 2008 Nanotechnology 19 455202 doi:10.1088/0957-4484/19/45/455202
Chih-Wen Lee1,2, Cedric Renaud1, Chain-Shu Hsu2 and Thien-Phap Nguyen1
Show affiliationsWe report the fabrication and investigations of organic light-emitting diodes (OLEDs) using a composite made by mixing poly[2-methoxy-5(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) with CdSe/ZnS core/shell quantum dots (QDs). The electroluminescence efficiency of the studied devices was found to be improved as compared to devices using MEH-PPV. Moreover, the current density decreased with increasing QD concentration. We checked the effects of QDs on the electrical transport by determining the trap states, making use of the charge-based deep level transient spectroscopy (Q-DLTS) technique. The most striking result obtained is the decrease in trap density when adding QDs to the MEH-PPV polymer film. These results suggest that QDs would heal defects in nanocomposite-based devices and that CdSe/ZnS QDs prevent the trap center formation.
73.50.Gr Charge carriers: generation, recombination, lifetime, trapping, mean free paths
Condensed matter: electrical, magnetic and optical
Issue 45 (12 November 2008)
Received 17 July 2008, in final form 2 September 2008
Published 8 October 2008
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