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SUMMARY:Utilizing Triplet Energy Transfer for Photon Upconversion in Biolog
 ical Applications
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20211111T160000
UID:2026-04-10-01-25-24@natsci.colostate.edu
DTSTAMP:20260410T012524
Description:Literature Seminar:\n\nPhoton upconversion is a process that co
 nverts low energy light into higher energy light. This process has the pot
 ential to dramatically improve the interaction of light and biological tis
 sue through the local generation of visible light\, which can allow for de
 ep tissue bioimaging. However\, frequently utilized photon upconversion sy
 stems historically incorporate toxic materials\, such as cadmium or lead n
 anocrystals. Utilizing heavy metal nanocrystals as light absorbers limits 
 the potential for photon upconversion systems to function in biological en
 vironments. In this talk\, I will discuss research performed by Xia et. al
 . where they demonstrate photon upconversion through triplet energy transf
 er using nontoxic silicon nanocrystals attached with anthracene triplet ac
 ceptors. Through photoluminescence and transient absorption spectroscopy\,
  they show for the first time silicon with triplet-accepting molecules bei
 ng used as a photosensitizer for photon upconversion with a 7% efficiency.
  Additionally\, they highlight the feasibility of their system to function
  in biological environments through incorporating their photon upconversio
 n system in aqueous micelles. In doing so\, their system can potentially m
 eet the demands for biocompatible upconversion systems. The authors develo
 p a kinetic model to emphasize that the inefficiency of their system stems
  from heterogeneous nanocrystal size distribution. Future work such as imp
 roving synthetic methods to stabilize smaller silicon nanocrystals can imp
 rove the overall efficiency of their system.\n\n&nbsp\;\n\nPaper: Xia\, P.
 \; Raulerson\, E. K.\; Coleman\, D.\; Gerke\, C. S.\; Mangolini\, L.\; Tan
 g\, M. L.\; Roberts\, S. T. Achieving Spin-Triplet Exciton Transfer betwee
 n Silicon and Molecular Acceptors for Photon Upconversion. Nature Chemist
 ry 2019\, 12(2)\, 137–144. 4:00 pm
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