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나노물질 및 화학반응 연구단
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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(s)
Lee, BR; Jung, ED; Park, JS; Nam, YS; Min, SH; Kim, BS; Lee, KM; Jeong, JR; Friend, RH; Kim, JS; Sang Ouk Kim; Song, MH
Publication Date
2014-09
Journal
NATURE COMMUNICATIONS, v.5, no., pp.4840 -
Publisher
NATURE PUBLISHING GROUP
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-MEþEA 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 A1 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
http://pr.ibs.re.kr/handle/8788114/1550
DOI
10.1038/ncomms5840
ISSN
2041-1723
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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