Due to the partially reduced π-conjugation of the fullerene cage, multi-functionalized fullerene derivatives exhibit remarkable fluorescent properties compared to pristine fullerenes, which have high potential for application in organic light-emitting diodes (OLEDs). In this study two multi-functionalized C derivatives, C(OCH)[C(COOEt)] and C(OCH)[C(COOEt)], with excellent fluorescence properties, were designed and synthesized. Compared with C(OCH) containing a single kind of functional group, both the C(OCH)[C(COOEt)] and C(OCH)[C(COOEt)] exhibited enhanced fluorescence properties with blue fluorescence emission. The fluorescence quantum yields of the C(OCH)[C(COOEt)] and C(OCH)[C(COOEt)] were 1.94% and 2.30%, respectively, which were about ten times higher than that of C(OCH). The theoretical calculations revealed that the multi-functionalization of the C increased the S-T energy gap, reducing the intersystem crossing efficiency, resulting in the higher fluorescence quantum yield of the C derivatives. The results indicate that multi-functionalization is a viable strategy to improve the fluorescence of fullerene derivatives.
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| http://dx.doi.org/10.3390/nano12091426 | DOI Listing |
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