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Strong emission with high fluorescence quantum yield both in solution (up to 0.99) and in solid state (up to 0.60) was achieved in these asymmetric <jats:bold>BODIQPys<\/jats:bold>. For 6\u2010halogen substituted <jats:bold>BODIQPys<\/jats:bold>, the heavy atomic effect of bromine and iodine was suppressed in solution due to the strong electron\u2010withdrawing ability of the <jats:bold>BODIQPy<\/jats:bold> core. As a result, 6\u2010iodine substituted <jats:bold>BODIQPy<\/jats:bold> shows the unusual fluorescence quantum yields (&gt;0.70) in dichloromethane and tetrahydrofuran. In the solid state, the asymmetric structure induced a unique dimeric structure, and efficient luminescence was also observed. The formation of halogen bonds between carbonyl oxygen and bromine or iodine regulated the stacking mode and enhanced intermolecular interaction, resulting in a decline in the fluorescence quantum yield. 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