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Ultrabright and stable top-emitting quantum-dot light-emitting diodes with negligible angular color shift.

Authors :
Li M
Li R
Wu L
Lin X
Xia X
Ao Z
Sun X
Chen X
Chen S
Source :
Nature communications [Nat Commun] 2024 Jun 17; Vol. 15 (1), pp. 5161. Date of Electronic Publication: 2024 Jun 17.
Publication Year :
2024

Abstract

Top emission can enhance luminance, color purity, and panel-manufacturing compatibility for emissive displays. Still, top-emitting quantum-dot light-emitting diodes (QLEDs) suffer from poor stability, low light outcoupling, and non-negligible viewing-angle dependence because, for QLEDs with non-red emission, the electrically optimum device structure is incompatible with single-mode optical microcavity. Here, we demonstrate that by improving the way of determining reflection penetration depths and creating refractive-index-lowering processes, the issues faced by green QLEDs can be overcome. This leads to advanced device performance, including a luminance exceeding 1.6 million nits, a current efficiency of 204.2 cd A <superscript>-1</superscript> , and a T <subscript>95</subscript> operational lifetime of 15,600 hours at 1000 nits. Meanwhile, our design does not compromise light outcoupling as it offers an external quantum efficiency of 29.2% without implementing light extraction methods. Lastly, an angular color shift of Δu'v' = 0.0052 from 0° to 60° is achieved by narrowing the emission linewidth of quantum dots.<br /> (© 2024. The Author(s).)

Details

Language :
English
ISSN :
2041-1723
Volume :
15
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
38886405
Full Text :
https://doi.org/10.1038/s41467-024-49574-6