Unlocking Photoluminescence in 6,13-Bis(triisopropylsilylethynyl)pentacene: Singlet Fission Mitigation by 2D Material-Controlled Molecular Packing.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40734211.
- Also identified by DOI 10.1021/acsnano.5c07029.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Organic photoluminescent semiconductors hold significant potential for bioimaging, sensing, and light emitting devices. However, their practical use in optoelectronics is often limited by aggregation-caused quenching (ACQ) that drastically reduces the photoluminescence (PL) quantum yields in densely packed solids. Here we report the controlled molecular packing of 6,13-bis(triisopropylsilylethynyl)pentacene (TPn), a model organic semiconductor that typically exhibits negligible PL due to ultrafast singlet fission in its crystalline form. Using monolayer WS<sub>2</sub> (ML-WS<sub>2</sub>) as a growth substrate, we induced a transition from a standing-up to a reclining molecular orientation of TPn interfacial layers, effectively suppressing singlet fission and unlocking its PL emission. The type-I energy level alignment at the TPn/ML-WS<sub>2</sub> heterointerface further enhances TPn emission by exciton energy transfer from ML-WS<sub>2</sub>. This work provides an effective approach for tailoring the molecular packing of weakly emitting π-conjugated solids using two-dimensional nanomaterials, facilitating their application in optoelectronic devices.