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Oxygen-Enhanced Upconversion of near Infrared Light from Below the Silicon Band Gap
preprintsubmitted on 13.03.2019, 00:41 and posted on 13.03.2019, 13:47 by Timothy Schmidt, Elham Gholizadeh, Shyamal Prasad, Zhi Li Teh, Thilini Ishwara, Sarah Norman, Anthony J Petty, John E. Anthony, Shujuan Huang
Here we demonstrate an upconversion composition using semiconductor nanocrystal sensitizers that employs molecular triplet states below the singlet oxygen energy. We show that, contrary to the usual expectation, the admission of oxygen enhances the intensity of upconverted light and significantly speeds up the photochemical processes involved. Further, we demonstrate photochemical upconversion from below the silicon band gap in the presence of oxygen.
ARC Centre of Excellence in Exciton Science
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