Triplet Excited State of BODIPY Accessed by Charge Recombination and Its Application in Triplet–Triplet Annihilation Upconversion

2017 ◽  
Vol 121 (40) ◽  
pp. 7550-7564 ◽  
Author(s):  
Kepeng Chen ◽  
Wenbo Yang ◽  
Zhijia Wang ◽  
Alessandro Iagatti ◽  
Laura Bussotti ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Recombination ◽  
Triplet Excited State ◽  
Triplet Triplet Annihilation

scholarly journals Making triplets from photo-generated charges: observations, mechanisms and theory

2020 ◽  
Vol 19 (2) ◽  
pp. 136-158 ◽  
Author(s):  
Dáire J. Gibbons ◽  
Aram Farawar ◽  
Paul Mazzella ◽  
Stéphanie Leroy-Lhez ◽  
René M. Williams
Keyword(s):  
Excited State ◽  
Electron Donor ◽  
Charge Recombination ◽  
Triplet Excited State ◽  
Spin Flip ◽  
Donor Acceptor ◽  
A Charge

Photo-excitation of electron donor–acceptor systems can lead to the generation of a charge separated state (CT). Sometimes the charge recombination occurs mainly to the local triplet excited state (T1). How does the spin flip?

Long-lived charge-separated states of simple electron donor-acceptor dyads using porphyrins and phthalocyanines

2008 ◽  
Vol 12 (09) ◽  
pp. 993-1004 ◽  
Author(s):  
Kei Ohkubo ◽  
Shunichi Fukuzumi
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Electron Donor ◽  
Driving Force ◽  
Reorganization Energy ◽  
Charge Recombination ◽  
Zinc Phthalocyanine ◽  
Intramolecular Electron Transfer ◽  
Triplet Excited State ◽  
Donor Acceptor

Control of electron-transfer processes is described for a number of electron donor-acceptor dyads containing porphyrins or phthalocyanines as models for the photosynthetic reaction center. The rates for intramolecular electron transfer in the dyads are controlled by the driving force and reorganization energy of electron transfer. The small reorganization energy of electron transfer reactions and large driving force of charge recombination are required to form long-lived charge-separated states. A directly linked zinc chlorin-fullerene dyad, especially, has the longest lifetime of charge-separated state at 120 s at -150 °C, which is a much longer lifetime and higher energy than those of natural photosynthetic reaction centers. On the other hand, the charge-separated states of the phthalocyanine-based donor-acceptor dyads (silicon phthalocyanine-fullerene, and zinc phthalocyanine-perylenebisimide) are short-lived since charge recombination forms the low-lying triplet excited state of the chromophore. The energy of the charge-separated state of a zinc phthalocyanine-perylenebisimide dyad is decreased by binding of metal ions to the radical anion moiety in order to be lower than the triplet excited state. This results in formation of a long-lived charge-separated state. The mechanistic viability of formation of long-lived charge-separated states is demonstrated by a variety of examples based on the Marcus theory of electron transfer.

Triplet excited state of diiodoBOPHY derivatives: preparation, study of photophysical properties and application in triplet–triplet annihilation upconversion

2016 ◽  
Vol 4 (8) ◽  
pp. 1623-1632 ◽  
Author(s):  
Caishun Zhang ◽  
Jianzhang Zhao
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Triplet Excited State ◽  
Triplet Triplet Annihilation

A pyrrole-BF2-based chromophore (BOPHY) was used for the preparation of triplet photosensitizers and the photophysical properties were studied using transient absorption spectroscopy.

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