High efficiency yellow organic light-emitting diodes with a solution-process feasible iridium based emitter
JOURNAL OF MATERIALS CHEMISTRY C(2017)
摘要
Yellow emission plays an important role in many display and lighting applications, such as RGBY display or blue hazard free lighting sources, while a wet-process enables soft devices to be manufactured cost-effectively. We demonstrate here that high efficiency yellow organic light-emitting diodes can be made with an innovative solution-process viable iridium based material, bis[5-methyl-7-fluoro-8-trifluoromethyl-5H- benzo(c)(1,5) naphthyridin-6-one] iridium(picolinate) (FCF3BNO). The device exhibits a power efficacy of 49.2 lm W-1 at 1000 cd m(-2) with an external quantum efficiency of 22.7% with a spin-coated emissive layer. A National Television Standards Committee (NTSC) color saturation of 110% is achievable by employing the yellow emission along with the standard RGB. The high efficiency may be attributed to the electron-withdrawing F and CF3 substitutions in the emitter to prevent self-quenching from dense packing. We also found that high efficiency can be achieved for wet-processed devices simply by balancing the injected holes and electrons with the help of energy-level matching hosts. The resultant RGBY composed of pure white light is 8% more friendly than the typical RGB counterpart from a retina protection perspective and also 8% better with respect to melatonin secretion.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要