Bag, Sayan Kumar and Mandal, Arnab and Mondal, Bijan and Patra, Abhijit and Thakur, Arunabha (2025) Improved and Controlled Singlet Oxygen Generation by Photoswitchable Organic Delayed Fluorescence Emitter. ADVANCED OPTICAL MATERIALS, 13 (19). p. 2500620. ISSN 2195-1071
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The construction of heavy atom or metal-free pure organic systems that can simultaneously generate singlet oxygen (1O2) with enhanced efficiency via the F & ouml;rster resonance energy transfer (FRET) process and have the ability to switch the 1O2 generation process with precise control is a challenging task. Herein, for the first time, we have designed and developed an all-organic scaffold comprising of core substituted naphthalene diimide (cNDI) as a sensitizer, naphthalimide (NI) as an energy booster and dithienylethene (DTE) as a controlling unit with state-of-the-art optical matching to obtain controlled and efficient 1O2 generation (yield Phi Delta similar to 0.71) in toluene. The generated 1O2 was detected indirectly as well as directly (through phosphorescence of 1O2 at 1270 nm) and it has been used for the controlled photooxidation of various organic molecules. The developed molecule is capable of harvesting triplet by delayed fluorescence having an average long-lived emission lifetime (tau similar to 6.1 mu s in solution and similar to 30 mu s in solid state) with a singlet-triplet energy gap (Delta EST) of 0.1 eV. The steady-state and time-resolved emission spectroscopy (TRES) analyses at room temperature as well as at 77 K along with DFT calculations offered a detailed understanding of energy transfer (ET) pathways involved in controlled 1O2 generation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOTOOXIDATION; PHOTOSENSITIZERS; EFFICIENCY; LIGHT; FRET; controlled singlet oxygen generation; delayed fluorescence; dithienylethene; energy transfer; photoswitching |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Apr 2026 04:49 |
| Last Modified: | 15 Apr 2026 04:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66931 |
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