Abstract
Effects of single walled carbon nanotubes (SWNTs) on the electroluminescent performance of organic light-emitting diodes (OLEDs) have been investigated by mixing them in a hole-conducting layer and in a light-emitting layer in OLEDs. We found that SWNTs play different roles when used as polymer:SWNT composites in OLEDs. When used in a hole-conducting layer, SWNTs facilitate the charge transport in the transport layer and on the other hand they also act as the exciton quenching centers at the transporting/emitting interface provided their concentration is high enough. When used in a light-emitting layer, SWNTs act as an n-type dopant to increase electron transport in p-type electroluminescent film and subsequently improve the balancing degree of bipolar injection, leading to an enhancement in the electroluminescence efficiency.
| Original language | English |
|---|---|
| Pages (from-to) | 1098-1102 |
| Number of pages | 5 |
| Journal | Organic Electronics |
| Volume | 12 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2011 |
Funding
This research was supported by Center for Materials Processing at the University of Tennessee, Solid State Lighting Program of the Energy Efficiency and Renewable Energy, US Department of Energy. A portion of this research was conducted at the Center for Nanophase Materials Sciences through a user project (CNMS2009-055), which is sponsored at Oak Ridge National Laboratory by the Basic Energy Sciences, US Department of Energy. Authors express gratitude to Prof. Stanislaus S. Wong (Department of Chemistry, SUNY) for providing water-soluble SWNTs.
Keywords
- Carrier transport
- Electroluminescence
- Organic light-emitting diodes (OLEDs)
- Single walled carbon nanotubes (SWNTs)