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


Type

Article

Change log

Authors

Cho, Himchan 
Jeong, Su-Hun 
Park, Min-Ho 
Kim, Young-Hoon 
Wolf, Christoph 

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.

Description

Keywords

0912 Materials Engineering

Journal Title

Science

Conference Name

Journal ISSN

0036-8075
1095-9203

Volume Title

350

Publisher

American Association for the Advancement of Science (AAAS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/M005143/1)
EPSRC (via Brunel University London) (unknown)
Engineering and Physical Sciences Research Council (EP/G060738/1)
This work was partially supported by Samsung Research Funding Center of Samsung Electronics under Project Number SRFC-MA-1402-07. A.S. was partially supported by the Engineering and Physical Sciences Research Council (UK).