Solidarity means strength: In new silole luminogens, the solid aggregates are stronger emitters than isolated molecules. The solid-state emission is tunable by varying molecular structures of the luminogens. Increasing bulkiness of the substituents weakens intermolecular interactions and restricts intramolecular rotations, leading to a blue shift in emission color and a great increase in emission efficiency (see examples in picture).
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Zhao et al. (2009) studied this question.
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