High efficiency phosphorescent white organic light-emitting diodes with an ultra-thin red and green co-doped layer and dual blue emitting layers

作者：Xu Lisong; Tang Ching W^*; Rothberg Lewis J

来源：Organic Electronics, 2016, 32: 54-58.

DOI：10.1016/j.orgel.2016.02.010

• Organic light-emitting diodes
• White OLED
• Ultra-thin layer
• High performance
• Exciton energy transfer
• Lifetime

Phosphorescent white organic light emitting diodes (WOLEDs) with a multi-layer emissive structure comprising two separate blue layers and an ultra-thin red and green co-doped layer sandwiched in between have been studied. With proper host and dopant compositions and optimized layer thicknesses, high-performance WOLEDs having a power efficiency over 40 lm/W at 1000 cd/m(2) with a low efficiency roll-off have been produced. Through a systematic investigation of the exciton confinement and various pathways for energy transfer among the hosts and dopants, we have found that both the ultra-thin co-doped layer and two blue emitting layers play a vital role in achieving high device efficiency and controllable white emission.

• 出版日期2016-5