Tailoring the Energy Landscape in Quasi-2D Halide Perovskites Enables Efficient Green-Light Emission
Type
ArticleAuthors
Quan, Li Na
Zhao, Yongbiao
García de Arquer, F. Pelayo
Sabatini, Randy
Walters, Grant
Voznyy, Oleksandr

Comin, Riccardo
Li, Yiying
Fan, James Z.
Tan, Hairen

Pan, Jun

Yuan, Mingjian
Bakr, Osman

Lu, Zhenghong

Kim, Dong Ha

Sargent, Edward H.

KAUST Department
Functional Nanomaterials Lab (FuNL)KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
KUS-11-009-21Date
2017-05-102017-05-05
Online Publication Date
2017-05-10Print Publication Date
2017-06-14Permanent link to this record
http://hdl.handle.net/10754/623655
Metadata
Show full item recordAbstract
Organo-metal halide perovskites are a promising platform for optoelectronic applications in view of their excellent charge-transport and bandgap tunability. However, their low photoluminescence quantum efficiencies, especially in low-excitation regimes, limit their efficiency for light emission. Consequently, perovskite light-emitting devices are operated under high injection, a regime under which the materials have so far been unstable. Here we show that, by concentrating photoexcited states into a small subpopulation of radiative domains, one can achieve a high quantum yield, even at low excitation intensities. We tailor the composition of quasi-2D perovskites to direct the energy transfer into the lowest-bandgap minority phase and to do so faster than it is lost to nonradiative centers. The new material exhibits 60% photoluminescence quantum yield at excitation intensities as low as 1.8 mW/cm2, yielding a ratio of quantum yield to excitation intensity of 0.3 cm2/mW; this represents a decrease of 2 orders of magnitude in the excitation power required to reach high efficiency compared with the best prior reports. Using this strategy, we report light-emitting diodes with external quantum efficiencies of 7.4% and a high luminescence of 8400 cd/m2.Citation
Quan LN, Zhao Y, García de Arquer FP, Sabatini R, Walters G, et al. (2017) Tailoring the Energy Landscape in Quasi-2D Halide Perovskites Enables Efficient Green-Light Emission. Nano Letters. Available: http://dx.doi.org/10.1021/acs.nanolett.7b00976.Sponsors
This publication is based in part on work supported by award no. KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. L.N.Q. and D.H.K. acknowledge the financial support by National Research Foundation of Korea Grant funded by the Korean Government (2014R1A2A1A09005656 and 2015M1A2A2058365). F.P.G.d.A. acknowledges financial support from the Connaught fund.Publisher
American Chemical Society (ACS)Journal
Nano LettersPubMed ID
28475344Additional Links
http://pubs.acs.org/doi/full/10.1021/acs.nanolett.7b00976ae974a485f413a2113503eed53cd6c53
10.1021/acs.nanolett.7b00976
Scopus Count
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