Journal article

Photochemical upconversion of near-infrared light from below the silicon bandgap

Elham M Gholizadeh, Shyamal KK Prasad, Zhi Li Teh, Thilini Ishwara, Sarah Norman, Anthony J Petty, Jared H Cole, Soshan Cheong, Richard D Tilley, John E Anthony, Shujuan Huang, Timothy W Schmidt



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 ..

View full abstract

University of Melbourne Researchers


Awarded by Australian Research Council (Centre of Excellence in Exciton Science)

Funding Acknowledgements

This work was supported by the Australian Research Council (Centre of Excellence in Exciton Science CE170100026). The research used facilities supported by Microscopy Australia at the Electron Microscope Unit (EMU) and the Solid State and Elemental Analysis Unit within the Mark Wainwright Analytical Centre (MWAC) at UNSW Sydney.