Beilstein J. Org. Chem.2017,13, 768–778, doi:10.3762/bjoc.13.76
usage as energy down converting phosphors without employing inorganic transition or rare earth metals is reported in this article. Triethoxysilylpropyl-substituted derivatives of the blue emitting perylene, green emitting benzofurazane, and red emitting Nile red were synthesized and applied in the
convert the emitted UV light into light with correlated color temperatures of very cold white (41100 K, 10700 K) as well as a greenish white emission with correlated color temperatures of about 5500 K.
Keywords: benzofurazane; LED; luminophores; mesoporous silica hybrids; monoliths; Nile red; perylene
fluorophore derivatives 4 and 5 were accessible by Williamson ether synthesis [24]. The alkyne-functionalized green benzofurazane derivate 6 was obtained by nucleophilic aromatic substitution of 4-chloro-7-nitrobenzo[c][1,2,5]oxadiazole (3) with propargylamine. The alkyne-functionalized derivatives 4, 5 and 6
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Graphical Abstract
Scheme 1:
Synthesis of the triethoxysilyl-functionalized dye precursors 8, 9, and 10.