Improved Outcoupling Efficiency and Stability of Perovskite Light-Emitting Diodes using Thin Emitting Layers

Lianfeng Zhao, Kyung Min Lee, Kwangdong Roh, Saeed Uz Zaman Khan, Barry P. Rand

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

Hybrid organic–inorganic perovskite semiconductors have shown potential to develop into a new generation of light-emitting diode (LED) technology. Herein, an important design principle for perovskite LEDs is elucidated regarding optimal perovskite thickness. Adopting a thin perovskite layer in the range of 35–40 nm is shown to be critical for both device efficiency and stability improvements. Maximum external quantum efficiencies (EQEs) of 17.6% for Cs0.2FA0.8PbI2.8Br0.2, 14.3% for CH3NH3PbI3 (MAPbI3), 10.1% for formamidinium lead iodide (FAPbI3), and 11.3% for formamidinium lead bromide (FAPbBr3)-based LEDs are demonstrated with optimized perovskite layer thickness. Optical simulations show that the improved EQEs source from improved light outcoupling. Furthermore, elevated device temperature caused by Joule heating is shown as an important factor contributing to device degradation, and that thin perovskite emitting layers maintain lower junction temperature during operation and thus demonstrate increased stability.

Original languageEnglish (US)
Article number1805836
JournalAdvanced Materials
Volume31
Issue number2
DOIs
StatePublished - Jan 11 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Joule heating
  • light outcoupling
  • organic–inorganic hybrid perovskites
  • perovskite light-emitting devices
  • thermal management

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