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Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

Himchan Cho, Su‐Hun Jeong, Min Ho Park, Christoph Wolf, Chang‐Lyoul Lee, Jin Hyuck Heo, Aditya Sadhanala, NoSoung Myoung, Seunghyup Yoo, Sang Hyuk Im, Richard Henry Friend, Tae‐Woo Lee

Science · 2015 · 2,934 citations

doi.org/10.1126/science.aad1818

Abstract

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.

Cite this paper

Cho, H., Jeong, S., Park, M. H., Kim, Y.-H., Wolf, C., Lee, C., Heo, J. H., Sadhanala, A., Myoung, N., Yoo, S., Im, S. H., Friend, R. H., & Lee, T. (2015). Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes. Science, 350(6265), 1222–1225. https://doi.org/10.1126/science.aad1818

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