標題: Traps and performance of MEH-PPV/CdSe(ZnS) nanocomposite-based organic light-emitting diodes
作者: Lee, Chih-Wen
Renaud, Cedric
Hsu, Chain-Shu
Nguyen, Thien-Phap
應用化學系
Department of Applied Chemistry
公開日期: 12-Nov-2008
摘要: We 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.
URI: http://dx.doi.org/10.1088/0957-4484/19/45/455202
http://hdl.handle.net/11536/8148
ISSN: 0957-4484
DOI: 10.1088/0957-4484/19/45/455202
期刊: NANOTECHNOLOGY
Volume: 19
Issue: 45
結束頁: 
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