The Polymer Society of Korea

대학원생 구두발표(발표15분)

구두발표

Bifunctional Ligands Enable Tunable Transition Dipole Moment Alignment in Perovskite Nanocrystal Light Emitting Diodes

Weiyang Zhou (전북대학교)

강재욱 (Department of Flexible and Printable Electronics, LANL-JBNU Engineering Institute-Korea, Jeonbuk National University)

Weiyang Zhou (전북대학교), 강재욱 (Department of Flexible and Printable Electronics, LANL-JBNU Engineering Institute-Korea, Jeonbuk National University)

Perovskite nanocrystal light emitting diodes suffer from severe optical losses, in which the orientation of transition dipole moments (TDMs) plays a decisive role in governing photon outcoupling. Here, we systematically investigate how nanocrystal shape and stacking behavior regulate the orientation of TDMs in the emissive layer. A facile ligand-exchange strategy using bifunctional 1,5-naphthalenedisulfonic acid (NDSA) is introduced to promote long-range NC stacking and tailor the dielectric environment, thereby enhancing the preferential in-plane alignment of TDMs. As a result, the fraction of in-plane TDMs increases from 60% to 70%, leading to a substantial improvement in light outcoupling efficiency (η_out) from 16.15% to 20.09%. Benefiting from the optimized optical configuration, the resulting devices achieve a peak external quantum efficiency (EQE) of 22.63% at 5127 cd m^-2, maintain EQE above 20% over a wide luminance range of 400-8000 cd m^-2.

O12-25

2026-04-08  15:00 - 15:15