Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan.
International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan.
Nat Commun. 2018 Nov 28;9(1):5036. doi: 10.1038/s41467-018-07482-6.
Organic light-emitting diodes utilizing thermally activated delayed fluorescence is a potential solution for achieving stable blue devices. Sky-blue devices (CIE < 0.4) with high stability and high external quantum efficiency (>15%) at 1000 cd m based on either delayed fluorescence or phosphorescence are still limited and very hard to achieve simultaneously. Here, we report the design and synthesis of a new thermally activated delayed fluorescence emitter, 3PhCzCzBN. A sky-blue device based on 3PhCzCzBN exhibits a high external quantum efficiency of 16.6% at 1000 cd m. The device shows a sky-blue electroluminescence of 482 nm and achieves Commission Internationale de l' Eclairage coordinates of (0.17, 0.36). The sky-blue device exhibits a superb LT of 38 h. This is the first demonstration of high-efficiency and stable sky-blue devices (CIE < 0.4) based on delayed fluorescence, which represents an important advance in the field of blue organic light-emitting diode technology.
利用热激活延迟荧光的有机发光二极管是实现稳定蓝色器件的一种潜在解决方案。基于延迟荧光或磷光的高效率 (>15%)和高稳定性的天蓝色器件（CIE < 0.4），亮度为 1000 cd m，仍然非常有限，并且很难同时实现。在这里，我们报告了一种新的热激活延迟荧光发射器 3PhCzCzBN 的设计和合成。基于 3PhCzCzBN 的天蓝色器件在 1000 cd m 时的外量子效率达到 16.6%。该器件发出 482 nm 的天蓝色电致发光，达到国际照明委员会的坐标为（0.17，0.36）。天蓝色器件的 LT 达到了 38 小时。这是首次基于延迟荧光实现高效率和稳定的天蓝色器件（CIE < 0.4）的演示，这代表了蓝色有机发光二极管技术领域的重要进展。
