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Two polymorphs emitting near‐infrared (1 R form: α phase, λem=702 nm, Φf=0.41) and orange‐red fluorescence (1 O form: β phase, λem=618 nm, Φf=0.05) were synthesized by finely controlling the crystallization conditions of compound 1, a structurally simple excited‐state intramolecular proton transfer (ESIPT)‐active molecule. Multicolor amplified spontaneous emissions (ASEs) were realized, for the first...
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