High-Performance Green Light-Emitting Diodes Based on MAPbBr3 with π-Conjugated Ligand

Hee Ju An, Yun Cheol Kim, Do Hoon Kim, Jae Min Myoung

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The morphology, crystal size, and trap density of perovskite films significantly affect the luminescent properties of perovskite light-emitting diodes (PeLEDs). Recently, numerous studies have been conducted on ligands that surround the surface of perovskite crystals and passivate the trap sites to improve the performance of PeLEDs. In this study, a 4-aminobenzonitrile (ABN) ligand improved the performance of methylammonium lead bromide (MAPbBr3)-based PeLEDs by reducing the MAPbBr3 crystal size to the nanoscale and reducing the trap density. Moreover, the properties of PeLEDs with ABN were further improved using a surface-modified hole-transport layer (HTL) with a hydrophilic polymer. Finally, a bright green PeLED was fabricated, which exhibited the maximum luminance of 3350 cd/m2 with an external quantum efficiency of 8.85%. Therefore, it is believed that the use of proper ligands for the perovskite layer and the optimization of the charge-transport layer have great potential for the development of high-performance PeLEDs.

Original languageEnglish
Pages (from-to)16726-16735
Number of pages10
JournalACS Applied Materials and Interfaces
Volume12
Issue number14
DOIs
Publication statusPublished - 2020 Apr 8

Bibliographical note

Funding Information:
This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1901-01.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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