Highly efficient inverted polymer light-emitting diodes using surface modifications of ​ZnO layer
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- Highly efficient inverted polymer light-emitting diodes using surface modifications of ​ZnO layer
- Lee, Bo Ram; Jung, Eui Dae; Park, Ji Sun; Nam, Yun Seok; Min, Sa Hoon; Kim, Byeong-Su; Lee, Kyung-Min; Jeong, Jong-Ryul; Friend, Richard H.; Kim, Ji-Seon; Kim, Sang Ouk; Song, Myoung Hoon
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE COMMUNICATIONS, v.5, pp.4840
- 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.
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