CuInS2‐Based Quantum Dot Light‐Emitting Electrochemical Cells (QLECs)

Quantum dot/electrolyte hybrid light‐emitting devices (QLECs) present a novel class of large‐area light‐emitting devices potentially combining the efficiency, robustness, and color‐tunability of colloidal quantum dots (QDs) with the simple device architecture and easy fabrication of light emitting electrochemical cells. In this work, a Cd‐free QLEC based on CuInS2/ZnS (CIS/ZnS) core/shell QDs is presented. The impact of the amount of ionic liquid on the QLEC device performance is systematically studied. The introduction of the additional electron injecting/hole blocking ZnO nanocrystal top layer as well as the proper adjustment of the ionic component leads to CIS‐based QLECs exceeding 350 cd m−2 in brightness. A Cd‐free quantum dot light‐emitting electrochemical cell (QLEC) based on CuInS2/ZnS core/shell quantum dots is presented. The impact of amount of ionic liquid on QLEC device performance is systematically studied. The introduction of additional electron injecting/hole blocking ZnO nanocrystal top layer as well as the proper adjustment of the ionic component leads to QLECs exceeding 350 cd m−2 in brightness.