Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 52, Pages 27312-27317Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202113451
Keywords
colloids; film; lead halide perovskites; nanodots; nanosheets
Categories
Funding
- Spanish MICINN [CTQ2017-82711-P, PID2020-115710GB-100/AEI/10.13039/501100011033, FPU17/05564]
- Spanish MICINN (FEDER funds) [PID2019-111742GA-100, PID2019-104739GB-100/AEI/10.13039/501100011033]
- Spanish MICINN (Maria de Maeztu Programme for Units of Excellence in RD) [CEX2019-000919-M]
- European Union [ERC-2018StG 804110-2D-PnitoChem, 823717, 881603]
- Generalitat Valenciana (FEDER) [PROMETEO/2019/080, IDIFEDER/2018/064, CIDEGENT/2018/001, IDI-FEDER/2018/061]
- Government of Aragon [DGA E13-20R]
- Deutsche Forschungsgemeinschaft (DFG) [FLAG-ERA AB694/2-1]
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This study introduces highly (photo)chemical and colloidal stable hybrid lead halide perovskite nanosheets with deep blue emission, made possible by using p-toluenesulfonic acid/dodecylamine ligands and EuBr2 nanodots. The synthesized nanosheets can be preserved as a solid for at least one year and recovered from the solid when needed, making them promising candidates for manufacturing devices.
Ruddlesden-Popper lead halide perovskite (RP-LHP) nano-nanostructures can be regarded as self-assembled quantum wells or superlattices of 3D perovskites with an intrinsic quantum well thickness of a single or a few (n=2-4) lead halide layers; the quantum wells are separated by organic layers. They can be scaled down to a single quantum well dimension. Here, the preparation of highly (photo)chemical and colloidal stable hybrid LHP nanosheets (NSs) of ca. 7.4 mu m lateral size and 2.5 nm quantum well height (thereby presenting a deep blue emission at ca. 440 nm), is reported for the first time. The NSs are close-lying and they even interconnect when deposited on a substrate. Their synthesis is based on the use of the p-toluenesulfonic acid/dodecylamine (pTS/DDA) ligand pair and their (photo)chemical stability and photoluminescence is enhanced by adding EuBr2 nanodots (EuNDs). Strikingly, they can be preserved as a solid and stored for at least one year. The blue emissive colloid can be recovered from the solid as needed by simply dispersing the powder in toluene and then using it to prepare solid films, making them very promising candidates for manufacturing devices.
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