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

被引：0
作者：
Bo Ram Lee
Eui Dae Jung
Ji Sun Park
Yun Seok Nam
Sa Hoon Min
Byeong-Su Kim
Kyung-Min Lee
Jong-Ryul Jeong
Richard H. Friend
Ji-Seon Kim
Sang Ouk Kim
Myoung Hoon Song
机构：
[1] School of Materials Science and Engineering and KIST-UNIST Ulsan Center for Convergent Materials,Department of Chemistry and Department of Energy Engineering
[2] Ulsan National Institute of Science and Technology (UNIST),Department of Materials Science and Engineering
[3] Energy Nano Materials Research Center,Department of Physics and Centre for Plastic Electronics
[4] Korea Electronics Technology Institute (KETI),Department of Materials Science & Engineering
[5] Ulsan National Institute of Science and Technology (UNIST),undefined
[6] Graduate School of Green Energy Technology,undefined
[7] Chungnam National University,undefined
[8] Cavendish Laboratory,undefined
[9] Imperial College London,undefined
[10] Center for Nanomaterials and Chemical Reactions,undefined
[11] Institute for Basic Science (IBS),undefined
[12] KAIST,undefined
来源：
Nature Communications | / 5卷
关键词：
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
引用
收藏
相关论文
共 90 条
  • [1] Burroughes JH(1990)Light-emitting-diodes based on conjugated polymers Nature 347 539-541
  • [2] Friend RH(1999)Electroluminescence in conjugated polymers Nature 397 121-128
  • [3] Tang CW(1987)Organic electroluminescent diodes Appl. Phys. Lett. 51 913-915
  • [4] Vanslyke SA(1994)Angular-dependence of the emission from a conjugated polymer light-emitting diode—implications for efficiency calculations Adv. Mater. 6 491-494
  • [5] Greenham NC(2000)Improvement of output coupling efficiency of organic light-emitting diodes by backside substrate modification Appl. Phys. Lett. 76 1650-1652
  • [6] Friend RH(2005)Theoretical analysis on light-extraction efficiency of organic light-emitting diodes using FDTD and mode-expansion methods Org. Electron. 6 3-9
  • [7] Bradley DDC(2010)Light extraction from organic light-emitting diodes enhanced by spontaneously formed buckles Nat. Photonics 4 222-226
  • [8] Madigan CF(2012)Light extraction of organic light emitting diodes by defective hexagonal-close-packed array Adv. Funct. Mater. 22 3454-3459
  • [9] Lu MH(2006)Encapsulation-free hybrid organic-inorganic light-emitting diodes Appl. Phys. Lett. 89 183510-150
  • [10] Sturm JC(2008)Inverted solution processable OLEDs using a metal oxide as an electron injection contact Adv. Funct. Mater. 18 145-1845
123456789