Two diketopyrrolopyrrole derivatives (DPP1 and DPP2) are used for generating multiple luminescent colors (yellow-orange-red-deep red) in solution, nanoparticle, aggregate and solid states through an aggregation-induced emission (AIE) coupled excited-state intramolecular proton transfer (ESIPT) process. They are potentially useful for bioimaging due to their good biocompatibility and large Stoke shifts.
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Wu et al. (2018) studied this question.
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