Which mechanism causes increased light absorption when dye molecules aggregate on a surface?

💡 Explanation

When dye molecules aggregate, exciton splitting occurs due to the interaction between the highest occupied molecular orbitals (HOMO) and lowest unoccupied molecular orbitals (LUMO) of adjacent molecules, leading to altered energy levels and a broader absorption spectrum. Therefore increased light absorption results, rather than reduced emission, enhanced scattering, or broadened bandwidth which require different conditions.

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