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2024 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 124, no 4, article id 041106Article in journal (Refereed) Published
Abstract [en]
All-inorganic perovskite quantum dots (PeQDs) have aroused great research interest in white light-emitting diodes (WLED) due to their excellent optoelectronic properties, but the poor stability, caused by dynamically binding long-chain capping ligands, hinders their future practical applications. To address this issue, here, we exploit short-chain butyric acid (BA) to replace long-chain oleic acid (OA) as capping ligand of CsPbX3 PeQDs by a hot-injection method. The addition of BA not only makes the morphology of CsPbBr3 PeQDs uniform and improves the crystallinity but also effectively suppresses nonradiative recombination, achieving a near unit photoluminescence quantum yield of 96%. The BA capped CsPbBr3 PeQDs exhibit high stability up to 180 d stored in ambient environment and also significantly improved resistance against polar solvent, ultra-violet lamp irradiation, and heat, which is rationalized by the strong binding capacity and shortened distance of BA to the PeQDs through ab initio calculations. Furthermore, by combining green-emission CsPbBr3 and red-emission CsPbBr0.8I2.2 PeQDs with blue GaN chip, we achieved WLEDs with excellent luminous properties, showing their great potential in practical application of wide-color-gamut display and lighting.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2024
National Category
Materials Engineering Materials Chemistry
Research subject
Materials Science
Identifiers
urn:nbn:se:umu:diva-220079 (URN)10.1063/5.0176754 (DOI)001149415000002 ()2-s2.0-85183316634 (Scopus ID)
Funder
Bertil & Britt Svenssons Stiftelse för Belysningsteknik, No. 2019-8553
2024-01-272024-01-272024-05-27Bibliographically approved