Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Imaging in the short-wavelength infrared (SWIR, 1000-2000 nm) offers promising advantages over imaging in the visible or near-infrared spectral region, such as suppressed autofluorescence as well as reduced scattering and absorption by tissues. Imaging applications thus have the potential to achieve unprecedented resolution, penetration depths and acquisition speeds. However, to fully utilize the potential of SWIR imaging it is crucial to employ emitters that exhibit optical properties tailored for each individual application.
Here we present versatile, SWIR emissive InAs-based core-shell-shell quantum dots (CSS QDs) with tunable emission between 800-1400 nm, quantum yields up to 80% and narrow emission profiles. In a conclusive study we examine the kinetics that govern formation and growth of III-V QDs and use the insights to develop novel synthetic approaches toward the synthesis of large InAs QDs with narrow size distributions. Subsequently, we show the rational synthesis of CSS QDs with improved stability and brightness that facilitate straight forward phase transfer. Ultimately, we demonstrate the versatility of our particles through applications in ultra fast in vivo imaging of blood flow in brain tumors, as well as in two-photon SWIR microscopy for advanced z-sectioning and penetration depth.
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