Improved efficiencies in organic light emitting diodes made with CdSe/ZnS quantum dots and a semiconducting polymer

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Abstract

In this study, we report the fabrication and characterization of organic/inorganic hybrid polymer light emitting diodes (PLEDs) made with ZnS-capped CdSe core/shell type nanocrystals and a light-emitting polymer poly[2-phenyl-3-(9,9-dihexylfluoren-2-yl)-1,4-phenylene vinylene]-co-[2-methoxy- 5-(2'-ethylhexyloxy)-1,4-phenylene vinylene]. The device using pristine polymer as active layer emitted yellow light with a maximum brightness of 3949 cd/m 2 and maximum external quantum efficiency of 0.27 cd/A at 10 V. After blending with the CdSe/ZnS quantum dots (QDs), the device showed a much higher brightness of 8192 cd/m 2 and external quantum efficiency of 1.27 cd/A at 7 V, while the driving voltage was lowered. The experimental results revealed that CdSe/ZnS QDs act as a hole-blocker in the devices. More efficient electron-hole recombination process inside polymer layer results in large improvement in luminescence and efficiency

Original languageEnglish
Pages (from-to)2076-2080
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number3
DOIs
StatePublished - 1 Mar 2009

Keywords

  • Nano-Composite
  • Organic light emitting diode
  • Quantum dot

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