Photochemical upconversion of near-infrared light from below the silicon bandgap
| Autor: | Thilini Ishwara, Jared H. Cole, Shyamal K. K. Prasad, Richard D. Tilley, Soshan Cheong, Shujuan Huang, Elham M. Gholizadeh, John E. Anthony, Timothy W. Schmidt, Anthony J. Petty, Sarah Norman, Zhi Li Teh |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Violanthrone
Materials science Silicon Singlet oxygen Infrared Physics::Optics chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Photochemistry 7. Clean energy 01 natural sciences Atomic and Molecular Physics and Optics Photon upconversion Electronic Optical and Magnetic Materials 010309 optics Condensed Matter::Materials Science chemistry.chemical_compound chemistry Quantum dot 0103 physical sciences Singlet fission 0210 nano-technology Visible spectrum |
| Zdroj: | Nature Photonics. 14:585-590 |
| ISSN: | 1749-4893 1749-4885 |
| DOI: | 10.1038/s41566-020-0664-3 |
| Popis: | Photochemical upconversion is a strategy for converting infrared light into more energetic, visible light, with potential applications ranging from biological imaging and drug delivery to photovoltaics and photocatalysis. Although systems have been developed for upconverting light from photon energies in the near-infrared, upconversion from below the silicon bandgap has been out of reach. Here, we demonstrate an upconversion composition using PbS semiconductor nanocrystal sensitizers that absorb photons below the bandgap of silicon and populate violanthrone triplet states below the singlet oxygen energy. The triplet-state violanthrone chromophores luminesce in the visible spectrum following energy delivery from two singlet oxygen molecules. By incorporating organic chromophores as ligands onto the PbS nanocrystals to improve energy transfer, we demonstrate that violanthrone upconverts in the absence of oxygen by the triplet–triplet annihilation mechanism. The change in mechanism is shown by exploiting the magnetic field effect on triplet–triplet interactions. Photochemical upconversion of light with photon energy below the silicon bandgap has remained elusive, but the feat has now been demonstrated using PbS semiconductor nanocrystals and violanthrone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink