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Received July 3, 2009
Accepted July 28, 2009
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Enhanced efficiency of white polymer light-emitting diodes with inorganic nanodots
1School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea 2Advanced Materials and Process Research Center for IT, Sungkyunkwan University, Suwon 440-746, Korea
sungmcho@skku.edu
Korean Journal of Chemical Engineering, February 2010, 27(2), 683-687(5), 10.1007/s11814-010-0059-0
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Abstract
Enhanced efficiency of white polymer light-emitting diodes (PLEDs) was observed by incorporating polysilicic acid (PSA) nanodots into the hole-injection layer (HIL). The PLEDs employed three different phosphorescent dyes in a single emissive layer with a host polymer of poly(vinylcarbazole) (PVK). The optimal composition of the phosphorescent dyes has been found to accomplish the white emission. By incorporating 1.5 wt% of PSA nanodots into the HIL, the maximum efficiency has been found to increase about 65%, from 13.7 cd/A to 22.9 cd/A. This remarkable improvement in efficiency may be attributed to the introduction of the PSA nanodots, which leads to the better carrier balance in the PLEDs.
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