We employed oleylphosphonic acid (OLPA) for the synthesis of CsPbBr3 nanocrystals (NCs). Compared to phosphonic acids with linear alkyl chains, OLPA features a higher solubility in apolar solvents, allowing us to work at lower synthesis temperatures (100 °C), which in turn offer a good control over the NCs size. This can be reduced down to 5.0 nm, giving access to the strong quantum confinement regime. OLPA-based NCs form stable colloidal solutions at very low concentrations (∼1 nM), even when exposed to air. Such stability stems from the high solubility of OLPA in apolar solvents, which enables these molecules to reversibly bind/unbind to/from the NCs, preventing the NCs aggregation/precipitation. Small NCs feature efficient, blue-shifted emission and an ultraslow emission kinetics at cryogenic temperature, in striking difference to the fast decay of larger particles, suggesting that size-related exciton structure and/or trapping-detrapping dynamics determine the thermal equilibrium between coexisting radiative processes.

Zhang, B., Goldoni, L., Lambruschini, C., Moni, L., Imran, M., Pianetti, A., et al. (2020). Stable and Size Tunable CsPbBr3 Nanocrystals Synthesized with Oleylphosphonic Acid. NANO LETTERS, 20(12), 8847-8853 [10.1021/acs.nanolett.0c03833].

Stable and Size Tunable CsPbBr3 Nanocrystals Synthesized with Oleylphosphonic Acid

Pianetti A.;Pinchetti V.;Brovelli S.
;
2020

Abstract

We employed oleylphosphonic acid (OLPA) for the synthesis of CsPbBr3 nanocrystals (NCs). Compared to phosphonic acids with linear alkyl chains, OLPA features a higher solubility in apolar solvents, allowing us to work at lower synthesis temperatures (100 °C), which in turn offer a good control over the NCs size. This can be reduced down to 5.0 nm, giving access to the strong quantum confinement regime. OLPA-based NCs form stable colloidal solutions at very low concentrations (∼1 nM), even when exposed to air. Such stability stems from the high solubility of OLPA in apolar solvents, which enables these molecules to reversibly bind/unbind to/from the NCs, preventing the NCs aggregation/precipitation. Small NCs feature efficient, blue-shifted emission and an ultraslow emission kinetics at cryogenic temperature, in striking difference to the fast decay of larger particles, suggesting that size-related exciton structure and/or trapping-detrapping dynamics determine the thermal equilibrium between coexisting radiative processes.
Articolo in rivista - Articolo scientifico
NMR; oleylphosphonic acid; perovskite nanocrystals;
English
17-nov-2020
2020
20
12
8847
8853
open
Zhang, B., Goldoni, L., Lambruschini, C., Moni, L., Imran, M., Pianetti, A., et al. (2020). Stable and Size Tunable CsPbBr3 Nanocrystals Synthesized with Oleylphosphonic Acid. NANO LETTERS, 20(12), 8847-8853 [10.1021/acs.nanolett.0c03833].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/297042
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