High Performance Fluorescent/Phosphorescent Hybrid White Organic Light-Emitting Diodes with High Phosphorescent Dopant Concentration and Low Efficiency Roll-Off
Two blue fluorophores with excellent hybridized local and charge-transfer(HLCT) and ”hot exciton” properties were developed as the blue emitter and the host of orange-red phosphor to achieve highly efficient fluorescent/phosphorescent (F/P) hybrid white organic light-emitting diodes (WOLEDs) in a single-emissive-layer single-dopant(single-EML-SD) architecture even at a high concentration of phosphorescent dopant.In the devices, part of the triplet excitons of the blue fluorophores can be utilized to realize reverse intersystem crossing from the triplet excited states to the singlet excited states for blue emission, and the diffusion volume range of the triplet excitons is reduced significantly.When the concentration of the phosphorescent dopant is up to 1.0 wt%,which is ten times higher than the traditional single-EML-SD F/P hybrid WOLEDs,highly efficient white emission was still achieved with maximum total external quantum efficiency (EQE) of 23.8%, current efficiency (CE) of 56.1 cd A-1, and power efficiency(PE) of 62.9 lm W-1.It opens a new avenue for achieving high performance F/P hybrid WOLEDs in a single-EML-SD architecture with easily controllable doping concentration.
Xinhua Ouyang Juan Wang Ziyi Ge
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo315201, P.R.China
国内会议
宁波
英文
621-638
2014-11-11（万方平台首次上网日期，不代表论文的发表时间）