Silicon nanocrystals with an average diameter of 5 nm and functionalized with 4,7-di(2-thienyl)-2,1,3-benzothiadiazole chromophores (TBT) and dodecyl chains exhibit near-infrared emission upon one-photon (1P) excitation at 515 nm and two-photon (2P) excitation at 960 nm. By using TBT chromophores as an antenna, we were able to enhance both 1P and 2P absorption cross-sections of the silicon nanocrystals to more efficiently excite their long-lived luminescence. These results chart a path to 2P-excitable imaging probes with long-lived oxygen-independent luminescence, a rare combination of properties that should allow for a substantial increase in imaging contrast.

Bright Long-Lived Luminescence of Silicon Nanocrystals Sensitized by Two-Photon Absorbing Antenna

RAVOTTO, LUCA;LOCRITANI, MIRKO;BERGAMINI, GIACOMO;NEGRI, FABRIZIA;CERONI, PAOLA
2017

Abstract

Silicon nanocrystals with an average diameter of 5 nm and functionalized with 4,7-di(2-thienyl)-2,1,3-benzothiadiazole chromophores (TBT) and dodecyl chains exhibit near-infrared emission upon one-photon (1P) excitation at 515 nm and two-photon (2P) excitation at 960 nm. By using TBT chromophores as an antenna, we were able to enhance both 1P and 2P absorption cross-sections of the silicon nanocrystals to more efficiently excite their long-lived luminescence. These results chart a path to 2P-excitable imaging probes with long-lived oxygen-independent luminescence, a rare combination of properties that should allow for a substantial increase in imaging contrast.
Ravotto, Luca; Chen, Qi; Ma, Yuguo; Vinogradov, Sergei A; Locritani, Mirko; Bergamini, Giacomo; Negri, Fabrizia; Yu, Yixuan; Korgel, Brian A.; Ceroni, Paola
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/585322
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