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.
authors.affiliation: Department of Electronic Engineering, Dong-A University, Busan 604-714, Korea.
authors.forename: Jeonghun
authors.initials: J
authors.lastname: Kwak
authors.forename: Wan Ki
authors.initials: WK
authors.lastname: Bae
authors.forename: Donggu
authors.initials: D
authors.lastname: Lee
authors.forename: Insun
authors.initials: I
authors.lastname: Park
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Lim
authors.forename: Myeongjin
authors.initials: M
authors.lastname: Park
authors.forename: Hyunduck
authors.initials: H
authors.lastname: Cho
authors.forename: Heeje
authors.initials: H
authors.lastname: Woo
authors.forename: Do Y
authors.initials: DY
authors.lastname: Yoon
authors.forename: Kookheon
authors.initials: K
authors.lastname: Char
authors.forename: Seonghoon
authors.initials: S
authors.lastname: Lee
authors.forename: Changhee
authors.initials: C
authors.lastname: Lee