Water additives improve the efficiency of violet perovskite light-emitting diodes

Hu, Manchen; Fernández, Sebastian; Zhou, Qi; Narayanan, Pournima; Saini, Balreen; Schloemer, Tracy H.; Lyu, Junrui; Gallegos, Arynn O.; Ahmed, Ghada H.; Congreve, Daniel N.

doi:10.1016/j.matt.2023.05.018

Water additives improve the efficiency of violet perovskite light-emitting diodes

Journal Article · Wed May 31 00:00:00 EDT 2023 · Matter (Online)

DOI:https://doi.org/10.1016/j.matt.2023.05.018· OSTI ID:2425842

Hu, Manchen ^[1]; Fernández, Sebastian ^[1]; Zhou, Qi ^[1]; Narayanan, Pournima ^[1]; Saini, Balreen ^[1]; Schloemer, Tracy H. ^[1]; Lyu, Junrui ^[1]; Gallegos, Arynn O. ^[1]; Ahmed, Ghada H. ^[1]; ^[1]

Stanford University, CA (United States)

High external quantum efficiencies (EQEs) have been achieved for blue, green, red, and near-infrared perovskite light-emitting diodes (PeLEDs), and their energy efficiencies are approaching the efficiencies of III-V-based LEDs. Beyond the visible regime, ultraviolet light offers great promise for many applications such as disinfection. However, PeLEDs demonstrate poor performance in the violet/ultraviolet region, with reports of violet PeLED performance hindered by poor thin-film quality. In this work, we improve the uniformity of perovskite films by adding water into the precursor solution to engineer the crystallization process of spin-coated 2D perovskites. The resulting improved film uniformity, coupled with the reduction in nanoplate size, reduces leakage current and promotes faster recombination rates. The fabricated PeLEDs deliver bright violet emission at 408 nm with a maximum external quantum efficiency of 0.41%, a 5-fold increase over control devices. Furthermore, this work demonstrates viable steps toward cost-effective, efficient ultraviolet PeLEDs.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Defense Advanced Research Projects Agency (DARPA); National Science Foundation Graduate Research Fellowship; National Science Foundation (NSF)

Grant/Contract Number:: SC0014664

OSTI ID:: 2425842

Journal Information:: Matter (Online), Journal Name: Matter (Online) Journal Issue: 7 Vol. 6; ISSN 2590-2385

Publisher:: Cell Press/ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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