Color-Tunable, Spectra-Stable Flexible White Top-Emitting Organic Light-Emitting Devices Based on Alternating Current Driven and Dual-Microcavity Technology

White top-emitting organic light-emitting diodes (TOLEDs) are attractive due to their freedom of choice in substrates. However, tunable color and stable spectra for white TOLED remain considerable challenges. Here, we conceive a novel, in-planar-electrodes, dual-microcavity OLED driven by alternating current signals to build white TOLEDs. Consequently, the microcavity effect in the dual-microcavity OLED can be separately optimized for blue and yellow emissive units. The color temperature of the device also can be adjusted by using alternating current signals. We finally achieve color-tunable, spectra-stable, flexible, white TOLEDs on polyethylene terephthalate (PET) substrate and paper substrate. This work will be beneficial to the further development of white, top-emitting devices, even including quantum dots LEDs and perovskite LEDs.