Color-pure red light-emitting diodes based on two-dimensional lead-free perovskites
Type
ArticleAuthors
Yuan, Fanglong
Zheng, Xiaopeng

Johnston, Andrew K.

Wang, Ya-Kun

Zhou, Chun
Dong, Yitong

Chen, Bin

Chen, Haijie

Fan, James Z.

Sharma, Geetu

Li, Peicheng
Gao, Yuan

Voznyy, Oleksandr

Kung, Hao-Ting
Lu, Zhenghong

Bakr, Osman

Sargent, E.

KAUST Department
Functional Nanomaterials Lab (FuNL)KAUST Catalysis Center (KCC)
Material Science and Engineering
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2020-10-14Online Publication Date
2020-10-14Print Publication Date
2020-10Submitted Date
2020-01-23Permanent link to this record
http://hdl.handle.net/10754/665768
Metadata
Show full item recordAbstract
It remains a central challenge to the information display community to develop red light-emitting diodes (LEDs) that meet demanding color coordinate requirements for wide color gamut displays. Here, we report high-efficiency, lead-free (PEA)2SnI4 perovskite LEDs (PeLEDs) with color coordinates (0.708, 0.292) that fulfill the Rec. 2100 specification for red emitters. Using valeric acid (VA)—which we show to be strongly coordinated to Sn$^{2+}$—we slow the crystallization rate of the perovskite, improving the film morphology. The incorporation of VA also protects tin from undesired oxidation during the film-forming process. The improved films and the reduced Sn$^{4+}$ content enable PeLEDs with an external quantum efficiency of 5% and an operating half-life exceeding 15 hours at an initial brightness of 20 cd/m$^{2}$. This work illustrates the potential of Cd- and Pb-free PeLEDs for display technology.Citation
Yuan, F., Zheng, X., Johnston, A., Wang, Y.-K., Zhou, C., Dong, Y., … Sargent, E. H. (2020). Color-pure red light-emitting diodes based on two-dimensional lead-free perovskites. Science Advances, 6(42), eabb0253. doi:10.1126/sciadv.abb0253Sponsors
E.H.S. and all coauthors from the Department of Electrical and Computer Engineering at the University of Toronto acknowledge the financial support from the Ontario Research Fund–Research Excellence Program, the Natural Sciences and Engineering Research Council of Canada (NSERC), and the Global Research Outreach program of Samsung Advanced Institute of Technology. Z.-H.L. and all coauthors from the Department of Materials Science and Engineering at the University of Toronto acknowledge the financial support from the NSERC (grant number 216956-12) and the National Natural Science Foundation of China (grant number 11774304). Computations were performed on the Niagara supercomputer at the SciNet HPC Consortium. SciNet is funded by the Canada Foundation for Innovation, the Government of Ontario, Ontario Research Fund–Research Excellence, and the University of Toronto.Journal
Science AdvancesPubMed ID
33055155PubMed Central ID
PMC7556835Additional Links
https://advances.sciencemag.org/lookup/doi/10.1126/sciadv.abb0253ae974a485f413a2113503eed53cd6c53
10.1126/sciadv.abb0253
Scopus Count
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