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

doi:10.1126/science.aad1818

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 journal › Article › peer-review

2102 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1222-1225
Number of pages	4
Journal	Science
Volume	350
Issue number	6265
DOIs	https://doi.org/10.1126/science.aad1818
Publication status	Published - 2015 Dec 4
Externally published	Yes

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title = "Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes",

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.",

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

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doi = "10.1126/science.aad1818",

language = "English",

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T1 - Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

AU - Cho, Himchan

AU - Jeong, Su Hun

AU - Park, Min Ho

AU - Kim, Young Hoon

AU - Wolf, Christoph

AU - Lee, Chang Lyoul

AU - Heo, Jin Hyuck

AU - Sadhanala, Aditya

AU - Myoung, No Soung

AU - Yoo, Seunghyup

AU - Im, Sang Hyuk

AU - Friend, Richard H.

AU - Lee, Tae Woo

PY - 2015/12/4

Y1 - 2015/12/4

N2 - 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.

AB - 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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SP - 1222

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JO - Science

JF - Science

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ER -

Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

Abstract

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