Extremely high-efficiency and ultrasimplified hybrid white organic light-emitting diodes exploiting double multifunctional blue emitting layers

摘要

White organic light-emitting diodes (WOLEDs) with a simplified structure and very-high efficiency could lead to low-cost commercialization. Many hybrid WOLEDs have been developed recently, but their commercialization is hindered by the relatively low efficiency complex structures. Now, Baiquan Liu of the South China University of Technology and co-workers have fabricated hybrid WOLEDs that overcome both these problems. In particular, they claim that their hybrid WOLEDs have the highest efficiency reported to date for such devices. The key to this achievement is the use of two blue emitting layers, which also serve as an electron transport layers and highly effective bridges for allowing electrons to reach an adjacent orange emitting layer. This arrangement increases the device’s efficiency by ensuring that all the excitons generated within the WOLED can be harvested for light emission.