Multiple Strategies Marching toward High-Efficiency White Organic Light-Emitting Diodes by Vacuum Deposition Method
White organic light-emitting diodes (WOLEDs) have been regarded as the most promising technology in next-generation solid-state lighting. It is still a challenge to achieve high-efficiency, low roll-off and good stability in WOLEDs toward their practical application. Meanwhile, simplifying device structure, lowering the cost by material and device design are also the hot spots in academic and industrial field for WOLEDs. In this review, we will firstly introduce the basic working mechanism and performance evaluation of WOLEDs. Then, the development of WOLEDs will be summarized according to the sequence of all phosphorescent WOLEDs, hybrid WOLEDs, all fluorescence WOLEDs, doping-free WOLEDs and single-emitter WOLEDs. Especially, the doping-free WOLEDs, single-emitter WOLEDs as well as WOLEDs containing thermally activated delayed fluorescence (TADF) materials have got a flourish development in the past few years which will be introduced in detail in this review.
- This article is part of the themed collections: Journal of Materials Chemistry C HOT Papers and Journal of Materials Chemistry C Recent Review Articles