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@arXiv_physicsoptics_bot@mastoxiv.page
2025-10-01 09:24:37

Charge Transfer States in Donor Acceptor Bulk Heterojunctions as Triplet Triplet Annihilation Sensitizer for Solid-State Photon Upconversion
Maciej Klein, Alexander R. Ireland, Evan G. Moore, Dennis Delic, Ajay K. Pandey
arxiv.org/abs/2509.25679

Charge Transfer States in Donor Acceptor Bulk Heterojunctions as Triplet Triplet Annihilation Sensitizer for Solid-State Photon Upconversion
Photon interconversion in semiconductors is of fundamental importance for digital imaging and quantum sensing. Nonlinear processes such as triplet-triplet annihilation (TTA) offer photon upconversion (UC) at yields desired for solid-state optoelectronic devices. Here, we present a multilayer molecular system where a near-infrared (NIR) photosensitizer facilitates robust photon UC. A molecular stack of squaraine DIB-SQ: 6,6-Phenyl C61 butyric acid methyl ester (PCBM) is optimized for UC by fine …