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Heavy-atom functionalization promotes triplet-assisted charge-transfer exciton transport in organic cocrystals
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Heavy-atom functionalization promotes triplet-assisted charge-transfer exciton transport in organic cocrystals
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Journal Article
Heavy-atom functionalization promotes triplet-assisted charge-transfer exciton transport in organic cocrystals
2026
Overview
Charge-transfer (CT) states with long transport distance are highly desirable for boosting the performance of organic optoelectronic devices. Although micron-scale CT transport has been observed in cocrystals, effective strategies for enhancing the diffusivity of CT excitons remain a challenge. Herein, based on heavy atom effect (HAE), we successfully promote CT exciton transport in thermally activated delayed fluorescence (TADF) cocrystals through bromine-atom functionalization. In Br-functionalized cocrystal, the diffusivity of triplet CT excitons is enhanced by an order of magnitude, enabling a long-distance triplet-assisted CT transport exceeding 16 μm. By adjusting the Br content, the CT transport and TADF-related kinetics can be effectively modulated, thereby significantly enhancing the utilization of CT excitons and the photocurrent responses of cocrystals. Our findings provide compelling evidence that heavy-atom functionalization can serve as an effective strategy to promote CT transport, which is of great significance for the performance optimization of organic optoelectronic devices.
Charge-transfer states with long transport distance have potential in organic optoelectronic devices, but it can be challenging to improve this. Here, the authors report the promotion of exciton transport in thermally activated delayed fluorescence cocrystals by bromine-atom functionalisation.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
