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Gert Van der Zwan Popular answer

Do to excitonic coupling between the monomers the emission spectrum shifts to the red. See also the thread https://www.researchgate.net/post/Why_are_JC1_dye_monomers_and_dimers_excited_at_two_different_wavelengths

Gert Van der Zwan

BIN YU

many thanks for your answer, Gert