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.
Original language | English |
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Pages (from-to) | 446-452 |
Number of pages | 7 |
Journal | ACS Nano |
Volume | 10 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 26 2016 |
Keywords
- Interband absorption
- Intraband absorption
- Near-infrared
- Quantum dot-quantum well
- Semiconductor nanocrystals
- Upconversion
ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
- Physics and Astronomy(all)