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Title: Highly efficient visible colloidal lead-halide perovskite nanocrystal light-emitting diodes
Authors: Yan, Fei
Xing, Jun
Xing, Guichuan
Quan, Lina
Tan, Swee Tiam
Zhao, Jiaxin
Su, Rui
Zhang, Lulu
Chen, Shi
Zhao, Yawen
Huan, Alfred
Sargent, Edward H.
Xiong, Qihua
Demir, Hilmi Volkan
Keywords: Science::Physics
Issue Date: 2018
Source: Yan, F., Xing, J., Xing, G., Quan, L., Tan, S. T., Zhao, J., . . . Demir, H. V. (2018). Highly efficient visible colloidal lead-halide perovskite nanocrystal light-emitting diodes. Nano Letters, 18(5), 3157-3164. doi:10.1021/acs.nanolett.8b00789
Journal: Nano Letters
Abstract: Lead-halide perovskites have been attracting attention for potential use in solid-state lighting. Following the footsteps of solar cells, the field of perovskite light-emitting diodes (PeLEDs) has been growing rapidly. Their application prospects in lighting, however, remain still uncertain due to a variety of shortcomings in device performance including their limited levels of luminous efficiency achievable thus far. Here we show high-efficiency PeLEDs based on colloidal perovskite nanocrystals (PeNCs) synthesized at room temperature possessing dominant first-order excitonic radiation (enabling a photoluminescence quantum yield of 71% in solid film), unlike in the case of bulk perovskites with slow electron–hole bimolecular radiative recombination (a second-order process). In these PeLEDs, by reaching charge balance in the recombination zone, we find that the Auger nonradiative recombination, with its significant role in emission quenching, is effectively suppressed in low driving current density range. In consequence, these devices reach a maximum external quantum efficiency of 12.9% and a power efficiency of 30.3 lm W–1 at luminance levels above 1000 cd m–2 as required for various applications. These findings suggest that, with feasible levels of device performance, the PeNCs hold great promise for their use in LED lighting and displays.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.8b00789
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays
The Photonics Institute
NOVITAS, Nanoelectronics Centre of Excellence
MajuLab, CNRS-UCA-SU-NUS-NTU International Joint Research Unit
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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