Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure

Jeonghun Kwak; Wan Ki Bae; Donggu Lee; Insun Park; Jaehoon Lim; Myeongjin Park; Hyunduck Cho; Heeje Woo; Do Y. Yoon; Kookheon Char; Seonghoon Lee; Changhee Lee

doi:10.1021/nl3003254

Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure

Jeonghun Kwak
, Wan Ki Bae
, Donggu Lee
, Insun Park
, Jaehoon Lim
, Myeongjin Park
, Hyunduck Cho
, Heeje Woo
, Do Y. Yoon
, Kookheon Char
, Seonghoon Lee
, Changhee Lee

Dong-A University
Los Alamos National Laboratory
Seoul National University

Research output: Contribution to journal › Article › peer-review

934 Scopus citations

Abstract

We report highly bright and efficient inverted structure quantum dot (QD) based light-emitting diodes (QLEDs) by using solution-processed ZnO nanoparticles as the electron injection/transport layer and by optimizing energy levels with the organic hole transport layer. We have successfully demonstrated highly bright red, green, and blue QLEDs showing maximum luminances up to 23 040, 218 800, and 2250 cd/m ², and external quantum efficiencies of 7.3, 5.8, and 1.7%, respectively. It is also noticeable that they showed turn-on voltages as low as the bandgap energy of each QD and long operational lifetime, mainly attributed to the direct exciton recombination within QDs through the inverted device structure. These results signify a remarkable progress in QLEDs and offer a practicable platform for the realization of QD-based full-color displays and lightings.

Original language	English
Pages (from-to)	2362-2366
Number of pages	5
Journal	Nano Letters
Volume	12
Issue number	5
DOIs	https://doi.org/10.1021/nl3003254
State	Published - 9 May 2012
Externally published	Yes

Keywords

electroluminescence
inverted device structure
quantum dot light-emitting diodes
Quantum dots
zinc oxide nanoparticles

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10.1021/nl3003254

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@article{5aca662eed2445da891ce035b75f51fe,

title = "Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure",

abstract = "We report highly bright and efficient inverted structure quantum dot (QD) based light-emitting diodes (QLEDs) by using solution-processed ZnO nanoparticles as the electron injection/transport layer and by optimizing energy levels with the organic hole transport layer. We have successfully demonstrated highly bright red, green, and blue QLEDs showing maximum luminances up to 23 040, 218 800, and 2250 cd/m 2, and external quantum efficiencies of 7.3, 5.8, and 1.7\%, respectively. It is also noticeable that they showed turn-on voltages as low as the bandgap energy of each QD and long operational lifetime, mainly attributed to the direct exciton recombination within QDs through the inverted device structure. These results signify a remarkable progress in QLEDs and offer a practicable platform for the realization of QD-based full-color displays and lightings.",

keywords = "electroluminescence, inverted device structure, quantum dot light-emitting diodes, Quantum dots, zinc oxide nanoparticles",

author = "Jeonghun Kwak and Bae, \{Wan Ki\} and Donggu Lee and Insun Park and Jaehoon Lim and Myeongjin Park and Hyunduck Cho and Heeje Woo and Yoon, \{Do Y.\} and Kookheon Char and Seonghoon Lee and Changhee Lee",

year = "2012",

month = may,

day = "9",

doi = "10.1021/nl3003254",

language = "English",

volume = "12",

pages = "2362--2366",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "5",

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TY - JOUR

T1 - Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure

AU - Kwak, Jeonghun

AU - Bae, Wan Ki

AU - Lee, Donggu

AU - Park, Insun

AU - Lim, Jaehoon

AU - Park, Myeongjin

AU - Cho, Hyunduck

AU - Woo, Heeje

AU - Yoon, Do Y.

AU - Char, Kookheon

AU - Lee, Seonghoon

AU - Lee, Changhee

PY - 2012/5/9

Y1 - 2012/5/9

N2 - We report highly bright and efficient inverted structure quantum dot (QD) based light-emitting diodes (QLEDs) by using solution-processed ZnO nanoparticles as the electron injection/transport layer and by optimizing energy levels with the organic hole transport layer. We have successfully demonstrated highly bright red, green, and blue QLEDs showing maximum luminances up to 23 040, 218 800, and 2250 cd/m 2, and external quantum efficiencies of 7.3, 5.8, and 1.7%, respectively. It is also noticeable that they showed turn-on voltages as low as the bandgap energy of each QD and long operational lifetime, mainly attributed to the direct exciton recombination within QDs through the inverted device structure. These results signify a remarkable progress in QLEDs and offer a practicable platform for the realization of QD-based full-color displays and lightings.

AB - We report highly bright and efficient inverted structure quantum dot (QD) based light-emitting diodes (QLEDs) by using solution-processed ZnO nanoparticles as the electron injection/transport layer and by optimizing energy levels with the organic hole transport layer. We have successfully demonstrated highly bright red, green, and blue QLEDs showing maximum luminances up to 23 040, 218 800, and 2250 cd/m 2, and external quantum efficiencies of 7.3, 5.8, and 1.7%, respectively. It is also noticeable that they showed turn-on voltages as low as the bandgap energy of each QD and long operational lifetime, mainly attributed to the direct exciton recombination within QDs through the inverted device structure. These results signify a remarkable progress in QLEDs and offer a practicable platform for the realization of QD-based full-color displays and lightings.

KW - electroluminescence

KW - inverted device structure

KW - quantum dot light-emitting diodes

KW - Quantum dots

KW - zinc oxide nanoparticles

UR - https://www.scopus.com/pages/publications/84861070261

U2 - 10.1021/nl3003254

DO - 10.1021/nl3003254

M3 - Article

AN - SCOPUS:84861070261

SN - 1530-6984

VL - 12

SP - 2362

EP - 2366

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -

Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure

Abstract

Keywords

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