Two new coumarin-based fluorescent probes were synthesized and successfully applied for the efficient detection of ClO− as turn-on fluorescence chemosensors by the oxidative cleavage of C–O and CN, the detection limits (LOD) for the two probes are 154 nM and 32 nM, respectively.
The BaAl 2 Si 2 O 8 :Eu 2+ blue emitting phosphor was obtained through the one-step calcination process of precursors prepared by chemical co-precipitation method. The phase structure and luminescence propertied of the phosphor were investigated using X-ray diffraction (XRD) and a fluorescence spectrophotometer. The excitation spectrum exhibited a broad band between 230 nm and 400 nm and the emission peaking at about 470 nm was observed, which originated from the allowed f-d transition of Eu 2+ ions at Ba 2+ sites. Owing to the different optimal concentrations under different excitation wavelengths (254 nm and 365 nm), the energy-transfer mechanism in this phosphor has changed from the dipole-dipole interaction to the exchange interaction of Eu 2+ ions. phosphor, BaAl 2 Si 2 O 8 :Eu 2+ , luminescence properties, white LED PACS: 78.55.Hx, 42.55.Px
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