Abstract
Recently varieties of Bodipy derivatives showing intersystem crossing (ISC) have been reported as triplet photosensitizers, and the application of these compounds in photocatalysis, photodynamic therapy (PDT), and photon upconversion are promising. In this review we summarized the recent development in the area of Bodipy-derived triplet photosensitizers and discussed the molecular structural factors that enhance the ISC ability. The compounds are introduced based on their ISC mechanisms, which include the heavy atom effect, exciton coupling, charge recombination (CR)-induced ISC, using a spin converter and radical enhanced ISC. Some transition metal complexes containing Bodipy chromophores are also discussed. The applications of these new triplet photosensitizers in photodynamic therapy, photocatalysis, and photon upconversion are briefly commented on. We believe the study of new triplet photosensitizers and the application of these novel materials in the abovementioned areas will be blooming.
Highlights
Triplet Photosensitizers (PSs) are compounds showing strong absorption of UV or visible light, efficient intersystem crossing (ISC), appropriate excited state redox potential, and long triplet-state lifetimes
We have summarized the recent development of the Boron dipyrromethene (Bodipy)-derived triplet PSs, ranging from the molecular structure design to the applications of these materials
We studied the triplet-state property of the 2,6-diiodobisstyrylBodipy; the triplet-state lifetime was determined as 1.8 μs, and the singlet oxygen quantum yield was determined as 69% (Huang et al, 2013b)
Summary
Triplet Photosensitizers (PSs) are compounds showing strong absorption of UV or visible light, efficient intersystem crossing (ISC), appropriate excited state redox potential, and long triplet-state lifetimes. Since these diiodoBodipy derivatives showed strong absorption of visible light, an efficient ISC, and a long-lived triplet state, we used these triplet PSs for TTA upconversion (Wu et al, 2011). We found that the triplet state in 8 was not quenched, as compared to that of 9, in both aspects of tripletstate lifetimes (126 μs for 8, 241 μs for 9) and ISC quantum yields (approximated with the O.D. values of the nanosecond transient absorption) (Lou et al, 2018).
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