Bifunctional Ligand-Driven Transition Dipole Moment Alignment for Enhanced Light Outcoupling in Perovskite Quantum Dot Light-Emitting Diodes
발표자
Weiyang Zhou (전북대학교)
연구책임자
강재욱 (유연인쇄전자전문대학원)
초록
내용
As the internal quantum efficiency of the state-of-the-art perovskite quantum dot light-emitting diodes (PeQLEDs) losses approaches unity, enhancing photon extraction becomes critical due to severe optical. The orientation of transition dipole moments (TDMs) plays a key role in determining the light outcoupling efficiency (η out ). Herein, we investigated the influence of nanocrystal (NC) shape and stacking behavior on the alignment of TDMs in the emissive layer. To modulate the TDMs, we proposed a facile ligand exchange strategy with bifunctional 1,5-naphthalenedisulfonic acid, which increased the proportion of horizontally oriented TDMs in the film from 60% to 70% by enhancing the long-range stacking order of NCs. This improved orientation was instrumental in η out from 16.15% to 20.09%. As a result, devices with NDSA modified exhibit a peak external quantum efficiency of 22.63% at 5,127 cd/m² and a maximum luminance of 13,950 cd/m².