Research: Photon Upconversion and Downconversion
High efficiency photon upconversion and downconversion has the potential to revolutionize solar energy capture, photocatalysis, bioimaging, 3D printing, and low power lighting. Through leveraging electronic spin in molecular materials, triplet fusion and singlet fission present a platform for high efficiency and low power upconversion and downconversion.
Our focus lies in optimizing molecular materials for triplet fusion and singlet fission, and implementing these materials in state of the art devices. Previous work includes the first demostration of triplet fusion in a metal-organic framework, the development of high efficiency infrared to visible upconversion devices, and investigations into the diffusion and spin dynamics of these processes in a variety of systems.
Relevant Publications:
1 Ha, DG., Wan, R., Kim, C.A. et al. Exchange controlled triplet fusion in metal–organic frameworks. Nat. Mater. 21, 1275–1281 (2022). https://doi.org/10.1038/s41563-022-01368-1
2 Nanocrystal-Sensitized Infrared-to-Visible Upconversion in a Microcavity under Subsolar Flux. Mengfei Wu, Ting-An Lin, Jan O. Tiepelt, Vladimir Bulović, and Marc A. Baldo. Nano Letters 2021 21 (2), 1011-1016
3 A Heterogeneous Kinetics Model for Triplet Exciton Transfer in Solid-State Upconversion. Nadav Geva, Lea Nienhaus, Mengfei Wu, Vladimir Bulović, Marc A. Baldo, Troy Van Voorhis, and Moungi G. Bawendi. The Journal of Physical Chemistry Letters 2019 10 (11), 3147-3152. DOI: 10.1021/acs.jpclett.9b01058