Color-pure red light-emitting diodes based on two-dimensional lead-free perovskites

Fanglong Yuan, Xiaopeng Zheng, Andrew Johnston, Ya Kun Wang, Chun Zhou, Yitong Dong, Bin Chen, Haijie Chen, James Z. Fan, Geetu Sharma, Peicheng Li, Yuan Gao, Oleksandr Voznyy, Hao Ting Kung, Zheng Hong Lu*, Osman M. Bakr, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Scopus citations


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 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/m2. This work illustrates the potential of Cd- and Pb-free PeLEDs for display technology.

Original languageEnglish (US)
Article numbereabb0253
JournalScience Advances
Issue number42
StatePublished - Oct 2020

ASJC Scopus subject areas

  • General


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