Abstract
Two new urea-bipyridine derived bridged organosilanes (P5 and P6) have been synthesized and their hydrolysis–condensation under nucleophilic catalysis in the presence of Eu3+ salts led to luminescent bridged silsesquioxanes (M5-Eu and M6-Eu). An important loading of Eu3+ (up to 11%w) can be obtained for the material based on the 6,6′-isomer. Indeed the photoluminescence properties of these materials, that have been investigated in depth (photoluminescence (PL), quantum yield, lifetimes), show a significantly different complexation mode of the Eu3+ ions for M6-Eu, compared with M4-Eu (obtained from the already-reported 4,4′-isomer) and M5-Eu. Moreover, M6-Eu exhibits the highest absolute emission quantum yield value (0.18 ± 0.02) among these three materials. The modification of the sol composition upon the addition of a malonamide derivative led to similar luminescent features but with an increased quantum yield (0.26 ± 0.03). In addition, M6-Eu can be processed as thin films by spin-coating on glass subst...
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