52.4: Suppression of Initial Degradation for High‐Efficiency Solution‐Processed Organic Light Emitting Diodes

In OLED display, the burn‐in usually appears when the luminance is reduced by 3% or 5 % (LT97 or LT95). This means that extending the LT95 or LT97 is essential to bring OLED display one step closer to becoming a dominant display technic. Here, we report an improvement in initial stability by designing a double electron transport layer which results in overshooting effect. This effect can suppressed the initial degradation in the device. We successfully increased the LT95 by 7.3 times and LT97 by 8.8 times. Simultaneously, the trade‐off between lifetime and efficiency was eliminated as we also obtained very high efficiency of 91.8 cd/A and 26.5% EQE.