P‐120: Over 60 cd/A Efficient Vacuum‐free‐processed Green Quantum Dot Light‐Emitting Diodes for Next Generation Displays. Issue 1 (2nd June 2017) - Peng, Huiren
Abstract : Efficient vacuum‐free‐processed quantum dot light‐emitting diodes (QLEDs) are reported in this paper. By printing liquid metal cathodes, vacuum‐free‐processed QLEDs exhibit a high current efficiency of ~60 cd/A and a maximum external quantum efficiency (EQE) of 14.8% for green devices, which are about 1.4‐fold higher than 42.5 cd/A (EQE 10.6%) for the devices with thermally evaporated Al cathodes. The improved performance is attributed to the reduction of electron injection caused by the GaOx thin film, which serves as an electron‐blocking layer, and thus improves the charge balance. The EGaIn based solvent‐free liquid metals are promising printable electrode materials for roll‐to‐roll manufacturing efficient QLED displays.