Efficient Red-to-Blue Triplet–Triplet Annihilation Upconversion Using the C₇₀-Bodipy-Triphenylamine Triad as a Heavy-Atom-Free Triplet Photosensitizer

Triplet Photosensitizers and Their Applications in Triplet–Triplet Annihilation Upconversion

“…Liu et al utilized C 70 with a twisted structure as spin converters in triplet PS to synthesize the C 70 -Bodipy-triphenylamine ( 51 ), which possesses an extended π-conjugation system, so that the excitation wavelength can reach the NIR range in TTA-UC. The photoexcitation of a 51 and 3 mixture at 663 nm produced emission of the 3 moiety as upconversion in the 440–540 nm range and 4% Φ UC was determined with an anti-Stokes shift of 0.88 eV …”

“…It is critical to explore the potential application of newly developed TTA-UC systems. TTA-UC has been used in luminescence bioimaging, photodriven actuators, solar cells, , photocatalysis, ,− temperature sensing, photolithography, and many external stimuli-responsive molecular systems. ,, …”

Heavy-atom-free BODIPY dendrimer: utilizing the spin-vibronic coupling mechanism for two-photon photodynamic therapy in zebrafish

“…However, the absorption wavelength of most heavy-atom-free BODIPY photosensitizers was unable to reach the near-infrared region (NIR), 20 which result in the development of heavy-atom-free NIR-BODIPY photosensitizers coming nearly to a standstill. Although there are some new reports on heavy-atom-free NIR-BODIPY photosensitizers, 21–24 most of them are relatively immethodical and are usually accompanied by problems of difficult synthesis or ambiguous design strategy, which is not conducive to their systematized development and future practical application. Hence, from our aspect and knowledge, the establishment of an explicit and convenient design strategy is actually the most urgent issue for the development of heavy-atom-free NIR-BODIPY photosensitizers, and the dendrimer design strategy seems to be a worthy attempt.…”