Journal
SCIENCE ADVANCES
Volume 6, Issue 42, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb0253
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Funding
- Ontario Research Fund-Research Excellence Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Global Research Outreach program of Samsung Advanced Institute of Technology
- NSERC [216956-12]
- National Natural Science Foundation of China [11774304]
- Canada Foundation for Innovation
- Government of Ontario
- Ontario Research Fund-Research Excellence
- University of Toronto
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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)(2)SnI4 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 Sn2+-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 Sn4+ 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.
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