Abstract
Supramolecular assemblies based on luminescent components offer significant advantages over their discrete counterparts, including improved quantum yields, stability, and tunability. Following interest as advanced optoelectronic materials, thermally activated delayed fluorescence (TADF) emitters are incorporated into a range of supramolecular structures. Herein, a summary of the known examples of emissive supramolecular systems that operate via a TADF mechanism with comparisons, where possible, with their discrete counterparts is presented. While the types of supramolecular structures are diverse, there are limited examples shown for each class. With the increase in photophysical performance and/or emergence of new photochemical properties upon going from molecular to supramolecular, the potential that these systems hold becomes apparent.
Highlights
Supramolecular assemblies based on luminescent components offer significant thermally activated delayed fluorescence (TADF) emitters coupled with their loweradvantages over their discrete counterparts, including improved quantum yields, stability, and tunability
The authors propose that a hot-exciton mechanism is the source of TADF, whereby an exciton forms at the T2 state and undergoes RISC to the S1 state; this is possible due to the small energy gap between T2 and S1 compared with the much larger energy gap between T2 and T1.[73]. Incorporation of 7 as a component of the crystalline MetalÀOrganic Frameworks (MOFs)-2 results in decreased molecular vibrations, giving rise to high ISC and reverse intersystem crossing (rISC) rates of 6.94 Â sÀ1 and 1.91 Â sÀ1, respectively, at 300 K
We have presented a diverse set of examples of supramolecular systems that exhibit TADF
Summary
Compared with 1, 1-Co had a lower photoluminescence quantum yield and decreased lifetime (ΦPL 1⁄4 2.9%, τPL 1⁄4 13.8 μs), both attributed to photoinduced electron transfer (PET) from 1 to the cobalt centers. The authors note that CoIIÀÀ cannot be reduced by 1* due to the less negative potential of E(1þ/1*) versus E(CoII/CoIÀÀ) (À0.71 vs À1.12 V), supporting their proposed mechanism; other plausible pathways exist such as homolysis of CoIIIÀH.[40]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
