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- W1964393725 abstract "The electronic relaxation processes of a photoexcited linear perylenediimide−perylenemonoimide (PDI-PMI) acceptor−donor dyad were studied. PDI-PMI serves as a model compound for donor−acceptor systems in photovoltaic devices and has been designed to have a high-energy PDI−•-PMI+• charge transfer (CT) state. Our study focuses on the minimal Gibbs free energy (ΔGET) required to achieve quantitative CT and on establishing the role of charge recombination to a triplet state. We used time-resolved photoluminescence and picosecond photoinduced absorption (PIA) to investigate excited singlet (S1) and CT states and complemented these experiments with singlet oxygen (1Δg) luminescence and PIA measurements on longer timescales to study the population of triplet excited states (T1). In an apolar solvent like cyclohexene (CHX), photoinduced electron transfer does not occur, but in more polar solvents such as toluene (TOL) and chlorobenzene (CB), photoexcitation is followed by a fast electron transfer, populating the PDI−•-PMI+• CT state. We extract rate constants for electron transfer (ET; S1→CT), back electron transfer (BET; S1←CT), and charge recombination (CR) to lower-energy states (CT→S0 and CT→T1). Temperature-dependent measurements yield the barriers for the transfer reactions. For ET and BET, these correspond to predictions from Marcus−Jortner theory and show that efficient, near quantitative electron transfer (kET/kBET ≥ 100) can be obtained when ΔGET ≈ −120 meV. With respect to triplet state formation, we find a relatively low triplet quantum yield (ΦT < 25%) in CHX but much higher values (ΦT = 30−98%) in TOL and CB. We identify the PDI−•-PMI+• state as a precursor to the T1 state. Recombination to T1, rather than to the ground-state S0, is required to rationalize the experimental barrier for CR. Finally, we discuss the relevance of these results for electron donor−acceptor films in photovoltaic devices." @default.
- W1964393725 created "2016-06-24" @default.
- W1964393725 creator A5009116442 @default.
- W1964393725 creator A5028259338 @default.
- W1964393725 creator A5038975929 @default.
- W1964393725 creator A5073629238 @default.
- W1964393725 date "2008-08-27" @default.
- W1964393725 modified "2023-10-16" @default.
- W1964393725 title "Enhanced Intersystem Crossing via a High Energy Charge Transfer State in a Perylenediimide−Perylenemonoimide Dyad" @default.
- W1964393725 cites W112056368 @default.
- W1964393725 cites W127007680 @default.
- W1964393725 cites W182669160 @default.
- W1964393725 cites W1963538656 @default.
- W1964393725 cites W1964189177 @default.
- W1964393725 cites W1964464265 @default.
- W1964393725 cites W1969723408 @default.
- W1964393725 cites W1975235909 @default.
- W1964393725 cites W1976866402 @default.
- W1964393725 cites W1977282984 @default.
- W1964393725 cites W1978890358 @default.
- W1964393725 cites W1979963997 @default.
- W1964393725 cites W1980667568 @default.
- W1964393725 cites W1982341705 @default.
- W1964393725 cites W1982703701 @default.
- W1964393725 cites W1983507278 @default.
- W1964393725 cites W1987679241 @default.
- W1964393725 cites W1988893778 @default.
- W1964393725 cites W1989446365 @default.
- W1964393725 cites W1989533513 @default.
- W1964393725 cites W1991733573 @default.
- W1964393725 cites W1992526463 @default.
- W1964393725 cites W1993002778 @default.
- W1964393725 cites W1994083940 @default.
- W1964393725 cites W1995173183 @default.
- W1964393725 cites W2000364980 @default.
- W1964393725 cites W2002420733 @default.
- W1964393725 cites W2003350932 @default.
- W1964393725 cites W2005045749 @default.
- W1964393725 cites W2008193594 @default.
- W1964393725 cites W2008631597 @default.
- W1964393725 cites W2008979257 @default.
- W1964393725 cites W2010518362 @default.
- W1964393725 cites W2011880719 @default.
- W1964393725 cites W2012489083 @default.
- W1964393725 cites W2012546369 @default.
- W1964393725 cites W2012815733 @default.
- W1964393725 cites W2012869390 @default.
- W1964393725 cites W2013290148 @default.
- W1964393725 cites W2014152544 @default.
- W1964393725 cites W2014816627 @default.
- W1964393725 cites W2015257245 @default.
- W1964393725 cites W2015376344 @default.
- W1964393725 cites W2017216815 @default.
- W1964393725 cites W2019919654 @default.
- W1964393725 cites W2019949060 @default.
- W1964393725 cites W2020856089 @default.
- W1964393725 cites W2024507748 @default.
- W1964393725 cites W2024556718 @default.
- W1964393725 cites W2024954708 @default.
- W1964393725 cites W2025758176 @default.
- W1964393725 cites W2030414476 @default.
- W1964393725 cites W2030572740 @default.
- W1964393725 cites W2032774458 @default.
- W1964393725 cites W2034078366 @default.
- W1964393725 cites W2035000362 @default.
- W1964393725 cites W2044073391 @default.
- W1964393725 cites W2044145417 @default.
- W1964393725 cites W2044548394 @default.
- W1964393725 cites W2044864642 @default.
- W1964393725 cites W2047951832 @default.
- W1964393725 cites W2048972050 @default.
- W1964393725 cites W2049571054 @default.
- W1964393725 cites W2050105423 @default.
- W1964393725 cites W2052753905 @default.
- W1964393725 cites W2054006338 @default.
- W1964393725 cites W2055275145 @default.
- W1964393725 cites W2059860200 @default.
- W1964393725 cites W2062459557 @default.
- W1964393725 cites W2063302169 @default.
- W1964393725 cites W2064911269 @default.
- W1964393725 cites W2067197794 @default.
- W1964393725 cites W2067259576 @default.
- W1964393725 cites W2070127296 @default.
- W1964393725 cites W2073293561 @default.
- W1964393725 cites W2074573245 @default.
- W1964393725 cites W2075800930 @default.
- W1964393725 cites W2079149536 @default.
- W1964393725 cites W2079936715 @default.
- W1964393725 cites W2080548811 @default.
- W1964393725 cites W2082245656 @default.
- W1964393725 cites W2084286835 @default.
- W1964393725 cites W2085644131 @default.
- W1964393725 cites W2086181997 @default.
- W1964393725 cites W2086297882 @default.
- W1964393725 cites W2087461504 @default.
- W1964393725 cites W2089662716 @default.
- W1964393725 cites W2090391132 @default.
- W1964393725 cites W2093549529 @default.