Highly efficient and stable blue organic light-emitting diodes (OLEDs), although required for display and lighting applications, remain rare. Here we report a molecular perdeuteration strategy to stabilize blue thermally activated delayed fluorescence (TADF) emitters. Perdeuterated sky-blue TADF emitters exhibit higher efficiencies and doubled device lifetime in OLEDs compared with protonated emitters, owing to suppressed high-energy vibrations. Perdeuteration also leads to blue-shifted and narrowed spectra in the solid state, which in turn improves the Förster energy transfer to the deep-blue final emitter in TADF-sensitized fluorescent OLEDs. These devices exhibit a maximum external quantum efficiency of 33.1% and a lifetime to reach 80% of the initial luminance of 1,365 h with a Commission Internationale de l’Eclairage y coordinate of 0.20 at a luminance of 1,000 cd m⁻², even outperforming blue phosphorescent OLEDs. Our perdeuteration strategy improves the device performance of blue OLEDs, paving the way for their broader applications in displays and lightings.

尽管显示和照明应用需要高效且稳定的蓝色有机发光二极管 (OLED)，但它仍然很少见。在这里，我们报告了一种稳定蓝色热激活延迟荧光（TADF）发射器的分子全氘化策略。由于抑制了高能振动，与质子化发射器相比，全氘化天蓝色 TADF 发射器在 OLED 中表现出更高的效率和双倍的器件寿命。全氘化还会导致固态光谱发生蓝移和变窄，从而改善福斯特能量向 TADF 敏化荧光 OLED 中的深蓝色最终发射器的转移。这些器件的最大外量子效率为 33.1%，寿命达到初始亮度 1,365 小时的 80%，国际照明委员会y坐标为 0.20，亮度为 1,000 cd m ^-2，甚至优于蓝光磷光 OLED。我们的置换策略提高了蓝色 OLED 的器件性能，为其在显示器和照明领域的更广泛应用铺平了道路。