What is it about?

We measured the spectra of two-photon absorption in two different sizes of nanocrystalline silicon quantum dots by calibrating two-photon excited photoluminescence to a known reference standard. Excitation of photoluminescence by two-photon absorption can be advantageous for bio-imaging due to the ability to use redder light with deeper penetration depth in biological tissue and increased depth contrast. We simulated the efficiency of two-photon excited photoluminescence for bio-imaging applications of silicon quantum dots and compared them to other imaging agents and found that they were comparable or superior. Another advantage of silicon quantum dots in bio-imaging applications is their nontoxicity.

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Why is it important?

We present the first absolute measurement of two-photon absorption cross section spectra in two different sizes of nanocrystalline silicon quantum dots over a wide range of wavelengths. We also simulate their efficiency for bio-imaging applications and compare to other imaging agents to aid developers in this field.

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This page is a summary of: Two-Photon Excitation Spectroscopy of Silicon Quantum Dots and Ramifications for Bio-Imaging, ACS Nano, March 2022, American Chemical Society (ACS), DOI: 10.1021/acsnano.1c11428.
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