title: Bright, efficient, and color-stable violet ZnSe-based quantum dot light-emitting diodes.
abstract: In this paper, highly stable violet-blue emitting ZnSe/ZnS core/shell QDs have been synthesized by a novel "low temperature injection and high temperature growth" method. The resulting nearly monodisperse ZnSe/ZnS core/shell QDs exhibit excellent characteristics such as a high color saturation (typical spectral full width at half-maximum between 12 and 20 nm), good emission tunability in the violet-blue range of wavelengths from 400 to 455 nm, a high absolute PL quantum yield (up to 83%), and superior chemical and photochemical stability. By employing ZnSe/ZnS core/shell quantum dots (QDs) as emitters with a fully solution processable method, bright, efficient, and color-stable violet Cd-free quantum dot-based light-emitting diodes (QD-LEDs) with maximum luminance up to 2632 cd m(-2) and a peak EQE of 7.83% have been demonstrated successfully. Considering the factors of the photopic luminosity function, the brightness and efficiency results of such violet QD-LEDs not only represent a 12-fold increase in device efficiency and an extraordinary 100 times increase in luminance compared with previous Cd-free QD-LEDs but also can be much superior to the best performance (1.7%) of their Cd-based violet counterparts. These results demonstrate significant progress in short-wavelength QD-LEDs and shed light on the acceleration of commercial application of environmentally-friendly violet QD-based displays and lighting.
authors.affiliation: Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China. shenhuaibin@henu.edu.cn lsli@henu.edu.cn.
authors.forename: Aqiang
authors.initials: A
authors.lastname: Wang
authors.forename: Huaibin
authors.initials: H
authors.lastname: Shen
authors.forename: Shuaipu
authors.initials: S
authors.lastname: Zang
authors.forename: Qingli
authors.initials: Q
authors.lastname: Lin
authors.forename: Hongzhe
authors.initials: H
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Qian
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Niu
authors.forename: Lin
authors.initials: L
authors.lastname: Song Li