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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2022

Room-Temperature Doping of CsPbBr3 Nanocrystals with Aluminum

Résumé

B-site doping is an emerging strategy for tuning the emission wavelength of cesium lead halide ABX3 nanocrystals. We present a simple method for the post-synthetic doping of CsPbBr3 nanocrystals with aluminum at room temperature by exposing them to a solution of AlBr3 in dibromomethane. Despite the much smaller ionic radius of Al3+ compared to Pb2+, nominal doping levels in a range from 8.1% to 24.3% were obtained when increasing the Al/Pb feed ratio from 1 to 4.5. Al3+ introduction leads to a hypsochromic shift of the photoluminescence (PL) emission of the CsPbBr3 nanocrystals. The PL peak position is highly stable over at least 6 months and tunable in a range of 510 to 480 nm by increasing the doping level. Structural analyses revealed a linear correlation between the PL energy and the lattice parameter with a slope of -1.96 eV/Å.
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Dates et versions

hal-03671437 , version 1 (08-11-2022)

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Tuan Duong, Dmitry Aldakov, Stéphanie Pouget, Wai-Li Ling, Le Si Dang, et al.. Room-Temperature Doping of CsPbBr3 Nanocrystals with Aluminum. Journal of Physical Chemistry Letters, 2022, 13 (20), pp.4495-4500. ⟨10.1021/acs.jpclett.2c01021⟩. ⟨hal-03671437⟩
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