CsPbBr3 Quantum Dots 2.0: Benzenesulfonic Acid Equivalent Ligand Awakens Complete Purification

The stability and optoelectronic device performance of perovskite quantum dots (Pe‐QDs) are severely limited by present ligand strategies since these ligands exhibit a highly dynamic binding state, resulting in serious complications in QD purification and storage. Here, a “Br‐equivalent” ligand stra...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2019-07, Vol.31 (30), p.e1900767-n/a
Main Authors: Yang, Dandan, Li, Xiaoming, Zhou, Wenhan, Zhang, Shengli, Meng, Cuifang, Wu, Ye, Wang, Yue, Zeng, Haibo
Format: Article
Language:English
Subjects:
benzenesulfonic acid
Benzenesulfonic acids
Binding
CsPbBr3 quantum dots
Equivalence
equivalent ligand
Excitons
high stability
Lattice vacancies
Ligands
Optoelectronic devices
Perovskites
Photoluminescence
Purification
Quantum dots
quantum yield
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Summary:The stability and optoelectronic device performance of perovskite quantum dots (Pe‐QDs) are severely limited by present ligand strategies since these ligands exhibit a highly dynamic binding state, resulting in serious complications in QD purification and storage. Here, a “Br‐equivalent” ligand strategy is developed in which the proposed strong ionic sulfonate heads, for example, benzenesulfonic acid, can firmly bind to the exposed Pb ions to form a steady binding state, and can also effectively eliminate the exciton trapping probability due to bromide vacancies. From these two aspects, the sulfonate heads play a similar role as natural Br ions in a perfect perovskite lattice. Using this approach, high photoluminescence quantum yield (PL QY) > 90% is facilely achieved without the need for amine‐related ligands. Furthermore, the prepared PL QYs are well maintained after eight purification cycles, more than five months of storage, and high‐flux photo‐irradiation. This is the first report of high and versatile stabilities of Pe‐QD, which should enable their improved application in lighting, displays, and biologic imaging. A new equivalent ligand strategy with a strong ionic sulfonate head is demonstrated and the purification and storage problems of perovskite nanocrystals are overcome. Both theoretical and experimental results prove the elimination of nonradiative recombination and high quantum efficiency are maintained throughout purification, storage, and irradiation.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201900767