Broadband Near-Infrared to Visible Upconversion in Quantum Dot-Quantum Well Heterostructures.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 26592258.
- Also identified by DOI 10.1021/acsnano.5b05329.
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Abstract
Upconversion is a nonlinear process in which two, or more, long wavelength photons are converted to a shorter wavelength photon. It holds great promise for bioimaging, enabling spatially resolved imaging in a scattering specimen and for photovoltaic devices as a means to surpass the Shockley-Queisser efficiency limit. Here, we present dual near-infrared and visible emitting PbSe/CdSe/CdS nanocrystals able to upconvert a broad range of NIR wavelengths to visible emission at room temperature. The synthesis is a three-step process, which enables versatility and tunability of both the visible emission color and the NIR absorption edge. Using this method, one can achieve a range of desired upconverted emission peak positions with a suitable NIR band gap.