title: Semitransparent quantum dot light-emitting diodes by cadmium-free colloidal quantum dots.
abstract: The InP/ZnSe/ZnS multishell colloidal quantum dots (QDs) were prepared by convenient heating-up method for an emission layer of semitransparent quantum dot light-emitting diodes (QD-LEDs). The synthesized InP/ZnSe/ZnS multishell QDs exhibited an emission peak at 545 nm for clear green color with a full-width at half-maximum (FWHM) of 50 nm, and photoluminescent (PL) quantum yield (QY) of 45%. The multishell on the indium phosphide (InP) core helped increasing QY and stability by reducing interfacial defects. Using a Ca/Ag cathode, the whole QD-LEDs were semitransparent throughout the visible wavelengths. The maximum brightness and currernt efficiency of semitransparent QD-LEDs reached 587 cd/m2 and 1.52 cd/A by controlling the thickness of Ca/Ag cathode, which is comparable to the device with opaque LiF/Al cathode (1444 cd/m2 and 1.98 cd/A). The performance of our semitransparent and eco-friendly device is not matched with traditional cadmium (Cd) based QD-LEDs yet, but it shows the great potential for various window-type information displays.
authors.forename: Yohan
authors.initials: Y
authors.lastname: Kim
authors.forename: Christian
authors.initials: C
authors.lastname: Ippen
authors.forename: Tonino
authors.initials: T
authors.lastname: Greco
authors.forename: Min Suk
authors.initials: MS
authors.lastname: Oh
authors.forename: Jong Han
authors.initials: JH
authors.lastname: Chul
authors.forename: Jeongno
authors.initials: J
authors.lastname: Lee
authors.forename: Armin
authors.initials: A
authors.lastname: Wedel
authors.forename: Jiwan
authors.initials: J
authors.lastname: Kim