白光有机发光二极管的研究进展

Progress of White Organic Light-Emitting Diodes

由于白光有机发光二极管(WOLED)具有效率高、亮度高、功耗低、视角广、响应速度快、主动发光、超薄超轻以及可柔性化等优异性能,并在显示和照明领域有广阔的应用前景,受到学者和业界的广泛重视而成为研究热点.本文首先介绍了实现WOLED的不同方法,然后从发光材料种类的角度,阐述了全荧光WOLED、全磷光WOLED、基于荧光/磷光杂化WOLED以及延迟荧光WOLED近年来的研究进展,并结合我们研究团队最近的工作详细地介绍了不同高性能WOLED的器件结构、设计思想、工作原理、物理机制以及发光过程;接着,简单介绍了柔性WOLED最近研究进展;最后探讨了WOLED目前存在的问题及其未来的发展趋势.

White organic light-emitting diodes（WOLEDs） are now approaching mainstream display markets,and they are also being aggressively investigated for next-generation lighting applications because of their extraordinary characteristics, such as high efficiency, high luminance, lower power consumption, wide viewing angle, fast switching, ultralight weight, and flexibility. In this paper, we first introduce the various approaches to realize WOLEDs, and then summarize the properties and differences of the four types of WOLEDs from the perspective of the emitting materials. The recent development of fluorescent, phosphorescent, fluorescent/phosphorescent hybrid, and delayed fluorescence WOLEDs is comprehensively illustrated. By combining with our published works, we systematically review the device structures, design strategies, working mechanisms,physical theories, and electroluminescent processes of the reported WOLEDs. Then, the development of flexible WOLED is presented. Finally, the existing problems and trends of WOLEDs are discussed.