Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

Himchan Cho, Su Hun Jeong, Min Ho Park, Young Hoon Kim, Christoph Wolf, Chang Lyoul Lee, Jin Hyuck Heo, Aditya Sadhanala, No Soung Myoung, Seunghyup Yoo, Sang Hyuk Im, Richard H. Friend, Tae Woo Lee

Research output: Contribution to journalArticlepeer-review

2379 Citations (Scopus)


Organic-inorganic hybrid perovskites are emerging low-cost emitters with very high color purity, but their low luminescent efficiency is a critical drawback.We boosted the current efficiency (CE) of perovskite light-emitting diodes with a simple bilayer structure to 42.9 candela per ampere, similar to the CE of phosphorescent organic light-emitting diodes, with two modifications: We prevented the formation of metallic lead (Pb) atoms that cause strong exciton quenching through a small increase in methylammonium bromide (MABr) molar proportion, and we spatially confined the exciton in uniform MAPbBr3 nanograins (average diameter = 99.7 nanometers) formed by a nanocrystal pinning process and concomitant reduction of exciton diffusion length to 67 nanometers. These changes caused substantial increases in steady-state photoluminescence intensity and efficiency of MAPbBr3 nanograin layers.

Original languageEnglish
Pages (from-to)1222-1225
Number of pages4
Issue number6265
Publication statusPublished - 2015 Dec 4
Externally publishedYes

ASJC Scopus subject areas

  • General


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