Ideal conducting polymer anode for perovskite light-emitting diodes by molecular interaction decoupling

Abstract

An ideal conducing polymer anode (CPA) in organic and perovskite light-emitting diodes (LEDs) requires high electrical conductivity kappa, high work function WF, and prevention of exciton quenching between an anode and an overlying emitting layer. However, increasing the kappa and WF at the same time has been a very challenging unsolved issue due to their trade-off relationship: previous approaches to increase the WF have reduced the films kappa and vice versa. Therefore, delicate molecular scale control of the conducing polymer compositions are required to solve this fundamental issue. Here, we introduce an effective molecular scale control strategy to decouple the WF with kappa in a CPA while maintaining blocking capability of exciton quenching. This change resulted in a high current efficiency up to 52.86 cd A(-1) (10.93% ph el(-1)) in green polycrystalline perovskite LEDs. Our results provide a significant clue to develop effective CPAs for highly-efficient organic and perovskite LEDs.