Journal article
Long-range order enabled stability in quantum dot light-emitting diodes
- Abstract:
- Light-emitting diodes (LEDs) based on perovskite quantum dots (QDs) have produced external quantum efficiencies (EQEs) of more than 25% with narrowband emission1,2, but these LEDs have limited operating lifetimes. We posit that poor long-range ordering in perovskite QD films—variations in dot size, surface ligand density and dot-to-dot stacking—inhibits carrier injection, resulting in inferior operating stability because of the large bias required to produce emission in these LEDs. Here we report a chemical treatment to improve the long-range order of perovskite QD films: the diffraction intensity from the repeating QD units increases three-fold compared with that of controls. We achieve this using a synergistic dual-ligand approach: an iodide-rich agent (aniline hydroiodide) for anion exchange and a chemically reactive agent (bromotrimethylsilane) that produces a strong acid that in situ dissolves smaller QDs to regulate size and more effectively removes less conductive ligands to enable compact, uniform and defect-free films. These films exhibit high conductivity (4 × 10−4 S m−1), which is 2.5-fold higher than that of the control, and represents the highest conductivity recorded so far among perovskite QDs. The high conductivity ensures efficient charge transportation, enabling red perovskite QD-LEDs that generate a luminance of 1,000 cd m−2 at a record-low voltage of 2.8 V. The EQE at this luminance is more than 20%. Furthermore, the stability of the operating device is 100 times better than previous red perovskite LEDs at EQEs of more than 20%.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
-
-
(Preview, Accepted manuscript, pdf, 4.1MB, Terms of use)
-
- Publisher copy:
- 10.1038/s41586-024-07363-7
Authors
- Publisher:
- Springer Nature
- Journal:
- Nature More from this journal
- Volume:
- 629
- Issue:
- 8012
- Pages:
- 586-591
- Place of publication:
- England
- Publication date:
- 2024-05-08
- Acceptance date:
- 2024-03-27
- DOI:
- EISSN:
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1476-4687
- ISSN:
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0028-0836
- Pmid:
-
38720080
- Language:
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English
- Pubs id:
-
1995419
- Local pid:
-
pubs:1995419
- Deposit date:
-
2024-05-22
Terms of use
- Copyright holder:
- Wang et al
- Copyright date:
- 2024
- Rights statement:
- © 2024, The Author(s), under exclusive licence to Springer Nature Limited
- Notes:
- This is the accepted manuscript version of the article. The final version is available from Springer Nature at: 10.1038/s41586-024-07363-7
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