| 초록 |
The performance of alternating current driven electroluminescent devices significantly depends on the total amount of injected carriers as well as the balance of the number of injected carriers in an emission layer. Here, we demonstrate a new field-induced hole generation layer between an emission layer and an insulator for high performance AC-PEL. Our hole generation layer of doped PEDOT:PSS in the presence of multi-walled carbon nanotubes was also able to supply sufficient holes, giving rise to a good balance with the number of electrons readily injected from a top electrode. The resulting AC-PEL device exhibits high electroluminescence performance with a low turn-on voltage of 8.8 Vrms, a maximum luminance of 40919 cd m-2, a maximum current efficiency of 3.4 cd A-1 and a power efficiency of 3.25 lm W-1. Moreover, our hole generation layer enables us to develop an extremely flexible when combined with a polyemr insulator as well as a flexible transparent electrode. |
