Статья

Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

Himchan ChoDepartment of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of KoreaSu-Hun JeongDepartment of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of KoreaMin Ho ParkDepartment of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of KoreaYoung‐Hoon KimDepartment of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of KoreaChristoph WolfDepartment of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of KoreaChang‐Lyoul LeeAdvanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of KoreaJin Hyuck HeoDepartment of Chemical Engineering, College of Engineering, Kyung Hee University, 1 Seochon-dong, Giheung-gu, Youngin-si, Gyeonggi-do 446-701, Republic of KoreaAditya SadhanalaCavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UKNoSoung MyoungAdvanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of KoreaSeunghyup YooDepartment of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of KoreaSang Hyuk ImDepartment of Chemical Engineering, College of Engineering, Kyung Hee University, 1 Seochon-dong, Giheung-gu, Youngin-si, Gyeonggi-do 446-701, Republic of KoreaRichard H. FriendCavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UKTae‐Woo LeeDepartment of Chemical Engineering, Division of Advanced Materials Science, School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 790-784, Republic of Korea

2015en

ABI

Аннотация

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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Идентификаторы

DOI: 10.1126/science.aad1818

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar