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Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

by Cho, Himchan , Heo, Jin Hyuck , Yoo, Seunghyup , Wolf, Christoph , Jeong, Su-Hun , Kim, Young-Hoon , Lee, Chang-Lyoul , Sadhanala, Aditya , Myoung, NoSoung , Lee, Tae-Woo , Park, Min-Ho , Friend, Richard H. , Im, Sang Hyuk

in Ammonium / Current efficiency / Emitters / Excitons / Halides / Hybridization / Lead (metal) / Light / Light emitting diodes / Luminescence / Nanostructure / Nanotechnology / Perovskites / Phosphorescence

2015

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Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

2015

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2015

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Journal Article

Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

Cho, Himchan,

Heo, Jin Hyuck,

Yoo, Seunghyup,

Wolf, Christoph,

Jeong, Su-Hun,

Kim, Young-Hoon,

Lee, Chang-Lyoul,

Sadhanala, Aditya,

Myoung, NoSoung,

Lee, Tae-Woo,

Park, Min-Ho,

Friend, Richard H.,

Im, Sang Hyuk

2015

Overview

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.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

/ Halides