| 초록 |
The performance of alternating current driven electroluminescent devices significantly depends on the total amounts of injected carriers as well as their number balance, which requires the careful design of the relative energy structures of constituent layers. Here, we demonstrate that PEDOT:PSS, which was used as a buffer layer, can act as a novel field-induced hole generation layer (HGL) for charge-balanced alternating current polymer electroluminescence (AC-PEL). Facile electron injection was achieved by good alignment of a top electrode with lowest unoccupied molecular orbital of an emission layer while sufficient holes were provided from a PEDOT:PSS HGL. Our AC-PEL device exhibits the high EL performance of maximum luminance of 40 919 cd m-2, maximum current efficiency of 3.74 cd A-1 and power efficiency of 3.25 lm W-1. |
