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Improved photon absorption in dye-functionalized silicon nanocrystals synthesized via microwave-assisted hydrosilylation

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Abstract

Herein, we report a method to produce luminescent silicon nanocrystals (SiNc) that strongly absorb ultraviolet–visible light (300–550 nm) and emit in the near-infrared range (700–1000 nm) with a high photoluminescence quantum yield (PLQY). Using microwave-assisted hydrosilylation and employing reactive chromophores – such as ethenyl perylene, ethynyl perylene and ethylene-m-phenyl BODIPY – we are able to achieve a 10- and 3-fold enhancement of the absorption in the blue and green spectral range, respectively. The investigated dyes function both as passivating agents and highly efficient antenna, which absorb visible light and transfer the energy to SiNc with an efficiency of >95%. This enhanced absorption leads to a significant photoluminescence enhancement, up to ∼270% and ∼140% under excitation with blue and green light, respectively. Despite the gain in absolute brightness of the emission, we demonstrate that back energy transfer from the SiNc to the dyes leads to a decrease in the PLQY for dye-modified SiNc, as compared to unmodified SiNc. The synthesis of the SiNc-dye conjugates opens up new possibilities for applications of this abundant and non-toxic material in the field of solar energy harvesting, optical sensing and bioimaging via achieving strong NIR PL excited with visible light.

Graphical abstract: Improved photon absorption in dye-functionalized silicon nanocrystals synthesized via microwave-assisted hydrosilylation

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Supplementary files

Article information


Submitted
22 Nov 2019
Accepted
27 Jan 2020
First published
28 Jan 2020

This article is Open Access

Dalton Trans., 2020, Advance Article
Article type
Paper

Improved photon absorption in dye-functionalized silicon nanocrystals synthesized via microwave-assisted hydrosilylation

D. Beri, M. Jakoby, I. A. Howard, D. Busko, B. S. Richards and A. Turshatov, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04497C

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