Cross determination of exciton coherence length in J-aggregates
| Autor: | YURY RAKOVICH, Marek Grzelczak, Alexander S. Urban, Alba María Jumbo Nogales, Victor Krivenkov, Konstantin Rusakov |
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| Přispěvatelé: | Eusko Jaurlaritza, Office of Naval Research (US), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Popis: | The coherence length of the Frenkel excitons (Ncoh) is one of the most critical parameters governing many key features of supramolecular J-aggregates. Determining experimentally the value of Ncoh is a nontrivial task since it is sensitive to the technique/method applied, causing discrepancies in the literature data even for the same chemical compound and aggregation conditions. By using a combination of different experimental techniques including UV–vis–NIR, fluorescence emission, time-resolved photoluminescence, and transient absorption spectroscopies, we determined Ncoh values for J-aggregates of a cyanine dye. We found that the absorption spectroscopy alone - a widely used technique- fails in determining right value for Ncoh. The correct approach is based on the modification of photoluminescence lifetime and nonlinear response upon aggregation and careful analysis of the Stokes shift and electron–phonon coupling strength. This approach revealed that Ncoh of JC-1 J-aggregates ranges from 3 to 6. Y.R. acknowledges the support from the Basque Government (grants no. PIBA_2021_1_0026 and IT1526-22). Y.R. also acknowledges support from the Office of Naval Research Global (Award No. N62909-22-1-2031). The authors acknowledge support from MCIN/AEI/10.13039/501100011033 (Grant PID2019-111772RB-I00). V.K. has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 101025664 (QESPEM). |
| Databáze: | OpenAIRE |
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