Self-assembly of di(p-methoxylphenyl)dibenzofulvene in the absence and presence of CTAB (cetyl trimethylammonium bromide) leads to three emission forms: strongly yellow-green- and blue-emissive crystalline forms (as microrods), and weakly orange-emissive amorphous form. Each of these three emission forms can be prepared by adjusting the concentration of CTAB.
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Gu et al. (2012) studied this question.