The effect of various additives (NaCl, DNA, and CPB surfactant) on the structure and optical properties of luminescent molecular nanoclusters, J-aggregates of L-21 polymethine dye, has been investigated using stationary and time-resolved optical spectroscopy. It has been shown that all investigated additives enhance the dye aggregation and change its aggregate structure as manifested in a change of tilt angle between molecules in the molecular chain. Salt causes the biggest change of tilt angle whereas surfactant causes the smallest. It has been found that a decrease of tilt angle leads to an increase of J-aggregate luminescence intensity. The addition of CPB surfactant is shown to modify the exciton dynamics in J-aggregates whereas the other additives affect only their structure.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 2, pp. 250–255, March–April, 2009.
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Sorokin, A.V. Control of optical properties of polymethine dye J-aggregates using different additives. J Appl Spectrosc 76, 234–239 (2009). https://doi.org/10.1007/s10812-009-9158-2
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DOI: https://doi.org/10.1007/s10812-009-9158-2