Highly efficient inverted polymer light-emitting diodes using surface modifications of ​ZnO layer

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Title
Highly efficient inverted polymer light-emitting diodes using surface modifications of ​ZnO layer
Author
Lee, Bo RamJung, Eui DaePark, Ji SunNam, Yun SeokMin, Sa HoonKim, Byeong-SuLee, Kyung-MinJeong, Jong-RyulFriend, Richard H.Kim, Ji-SeonKim, Sang OukSong, Myoung Hoon
Issue Date
2014-09
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.5, pp.4840
Abstract
Organic light-emitting diodes have been recently focused for flexible display and solid-state lighting applications and so much effort has been devoted to achieve highly efficient organic light-emitting diodes. Here, we improve the efficiency of inverted polymer light-emitting diodes by introducing a spontaneously formed ripple-shaped nanostructure of ​ZnO and applying an amine-based polar solvent treatment to the nanostructure of ​ZnO. The nanostructure of the ​ZnO layer improves the extraction of the waveguide modes inside the device structure, and a ​2-ME+​EA interlayer enhances the electron injection and hole blocking in addition to reducing exciton quenching between the polar-solvent-treated ​ZnO and the emissive layer. Therefore, our optimized inverted polymer light-emitting diodes have a luminous efficiency of 61.6 cd A−1 and an external quantum efficiency of 17.8%, which are the highest efficiency values among polymer-based fluorescent light-emitting diodes that contain a single emissive layer.
URI
https://scholarworks.unist.ac.kr/handle/201301/8481
URL
https://www.nature.com/articles/ncomms5840
DOI
10.1038/ncomms5840
ISSN
2041-1723
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