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

被引：130

作者：

Lee, Bo Ram ^{[1
,2
]}

Jung, Eui Dae ^{[1
,2
]}

Park, Ji Sun ^{[3
]}

Nam, Yun Seok ^{[1
,2
]}

Min, Sa Hoon ^{[4
,5
]}

Kim, Byeong-Su ^{[4
,5
]}

Lee, Kyung-Min ^{[6
]}

Jeong, Jong-Ryul ^{[6
]}

Friend, Richard H. ^{[7
]}

Kim, Ji Seon ^{[8
,9
]}

Kim, Sang Ouk ^{[10
]}

Song, Myoung Hoon ^{[1
,2
]}

机构：

[1] UNIST, Ulsan Ctr Convergent Mat, Sch Mat Sci & Engn, Ulsan 689798, South Korea

[2] UNIST, Ulsan Ctr Convergent Mat, KIST, Ulsan 689798, South Korea

[3] KETI, Energy Nanomat Res Ctr, Songnam 463816, Gyeonggi Do, South Korea

[4] UNIST, Dept Chem, Ulsan 689798, South Korea

[5] UNIST, Dept Energy Engn, Ulsan 689798, South Korea

[6] Chungnam Natl Univ, Grad Sch Green Energy Technol, Dept Mat Sci & Engn, Taejon 305764, South Korea

[7] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[8] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[9] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[10] Korea Adv Inst Sci & Technol, Ctr Nanomat & Chem React, Inst Basic Sci, Dept Mat Sci & Engn, Taejon 305701, South Korea

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

英国工程与自然科学研究理事会;

关键词：

STABLE METAL-OXIDES; CONJUGATED POLYMER; EXTRACTION; DEVICES; BLENDS; OUTPUT;

D O I：

10.1038/ncomms5840

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

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

页数：8

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