Fluorescent light overlays sky8/9/2023 ![]() Organic light-emitting diodes (OLEDs) are attractive technology for display and lighting due to their high flexibility, high efficiency and light-weight 1, 2, 3, 4, 5. This is the first demonstration of high-efficiency and stable sky-blue devices (CIE y < 0.4) based on delayed fluorescence, which represents an important advance in the field of blue organic light-emitting diode technology. The sky-blue device exhibits a superb LT 90 of 38 h. The device shows a sky-blue electroluminescence of 482 nm and achieves Commission Internationale de l’ Eclairage coordinates of (0.17, 0.36). A sky-blue device based on 3Ph 2 CzCzBN exhibits a high external quantum efficiency of 16.6% at 1000 cd m −2. Here, we report the design and synthesis of a new thermally activated delayed fluorescence emitter, 3Ph 2 CzCzBN. ![]() ![]() Sky-blue devices (CIE y 15%) at 1000 cd m −2 based on either delayed fluorescence or phosphorescence are still limited and very hard to achieve simultaneously. Organic light-emitting diodes utilizing thermally activated delayed fluorescence is a potential solution for achieving stable blue devices. ![]()
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