Ultra-bright, highly efficient, low roll-off inverted quantum-dot light emitting devices (QLEDs)

We report an ultra-bright, highly efficient, low roll-off, inverted quantum dot-based red light emitting device (QLED) using solution-processed zinc oxide nanoparticles and cesium carbonate films as the electron injection and hole blocking layers, respectively. Record luminance of 165, 000 Cd/m² has been obtained at a current density of 1000 mA/cm² with a low driving voltage of 5.8 V for deep red device with C1E coordinates of (0.69, 0.31).