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Efficient Energy Transfer and Singlet Fission in Co-Deposited Thin Films of Pentacene and Anthradithiophene
Co-deposited molecular heterostructures with statistical intermixing of theconstituents are attractive candidates to tune the optical and the transportproperties, as well as the ability to promote photophysical processes likesinglet fission. In order to comprehend and control the singlet fissionmech...
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| Autoren: | , , , , , |
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| 格式: | 文件 |
| 语言: | 英语 |
| 出版: |
Philipps-Universität Marburg
2024
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| 总结: | Co-deposited molecular heterostructures with statistical intermixing of theconstituents are attractive candidates to tune the optical and the transportproperties, as well as the ability to promote photophysical processes likesinglet fission. In order to comprehend and control the singlet fissionmechanism in these systems, it is of utmost interest to study the underlyingexcited state dynamics. In this work, thin films of anthradithiophene blendedwith the efficient singlet fission material pentacene are investigated by meansof time-resolved and temperature-dependent photoluminescencespectroscopy with a time resolution of a few picoseconds. The analysis of thephotoluminescence dynamics points toward efficient funneling of excitonsfrom anthradithiophene via isolated pentacene molecules to agglomerates ofpentacene, where eventually singlet fission occurs. The efficient and largelytemperature-independent quenching of the luminescence inanthradithiophene is attributed to a favorable cascade-like alignment of theenergy levels, and it is hypothesized that Förster resonance energy transfer isthe main driving mechanism for exciton transport to pentacene agglomerates.The system investigated here can serve as a blueprint for the design of othermolecular heterostructures with spatially separated light harvesting andsinglet fission regions. |
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| Item Description: | Gefördert durch den Open-Access-Publikationsfonds der UB Marburg. |
| DOI: | 10.1002/admi.202300922 |