Enhancing Light Outcoupling Efficiency via Anisotropic Low Refractive Index Electron Transporting Materials for Efficient Perovskite Light‐Emitting Diodes

Abstract Thanks to the extensive efforts toward optimizing perovskite crystallization properties, high‐quality perovskite films with near‐unity photoluminescence quantum yield are successfully achieved. However, the light outcoupling efficiency of perovskite light‐emitting diodes (PeLEDs) is impeded by insufficient light extraction, which poses a challenge to the further advancement of PeLEDs. Here, an anisotropic multifunctional electron transporting material, 9,10‐bis(4‐(2‐phenyl‐1H‐benzo[d]imidazole‐1‐yl)phenyl) anthracene (BPBiPA), with a low extraordinary refractive index ( n e ) and high electron mobility is developed for fabricating high‐efficiency PeLEDs. The anisotropic molecular orientations of…

• CI
  Collaborative Innovation Center of Suzhou Nano Science and Technology
• HE
  Higher Education Discipline Innovation Project