Fig S1 to S6

See supplementary material for the device structure and EL spectrum of blue QLED, J-V-L characteristics of the pristine and shelf-aged blue QLEDs, C-V curves of the pristine and shelf-aged red QLEDs, C-V and dC/dV-V characteristics of pristine and shelf-aged blue devices at 100 Hz, luminance and EQE characteristics of blue QLED at different temperatures, original and fitting data of (C-Cg)-ω characteristic at 4.0 V.