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Lasing in organic hybrid systems based on energy transfer.
The search for new luminescent dyes become nowadays increasingly focused on chemical compounds able to emit light in the region of near-infrared, due to their potential use in medicine and bio-medical imaging. Here we show that the shift between the excitation and emission wavelength can be enlarged by the cascade FRET effect, involving the assistance of chromophore aggregates, whose molecules could be forced by specific interactions with $e.g.$ lipids or higher-order protein structures. Additionally, we can observed coupling between lasing and random lasing emission, which is a consequence of multiple light scattering on the formed dye aggregates, or micro and nanocrystals.