Molecular analogues of the green fluorescent protein (GFP) fluorophore have been designed by these authors (see Figure, X=NC4H9 or O). It is shown that by varying the donor and acceptor groups of the oxazolone (X=O) analogue the fluorescence emission can be tuned from blue to green to orange. The utility of these artificial fluorophores is explored by incorporating them into organic LEDs.
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You et al. (2000) studied this question.