Studies on new phosphors prepared by hybridization of lanthanides with polyctown ethers

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Fluorescence of Eu^<2+>-polycrown complexes has been studied. Blue bright emission was observed from the complex by 300nm excitation. Divalent europium ions in the complex were stable in air.A Eu^<2+> complex with poly(2-methacryloyloxymethyl-15-crown-5) was prepared by bulk polymerization of methacryloyloxymethyl-15-crown-5 using AIBN ( , '-Azobisisobutyronitrile) as an initiator at 60゜C.Bright emission was observed at 435nm by 400nm excitation with an intensity of 6.6% of that for CaWO_4:Pb (NBS 1026). The brightest emission was obtained when five crown rings in the polymer held one Eu^<2+> ion in the complex.Methacryloyloxymethyl-15-crown-5-methyl methacrylate copolymer was obtained by bulk copolymerization of methacryloyloxymethyl-15-crown-5 and methyl methacrylate using AIBN as an initiator. Methacryloyloxymethyl-15-crown-5 comonomer was synthesized by esterification of hydoxymethyl-15-crown-5 with methacryloyl chloride in chloroform using triethylamine.Emission of which intensity is 23.1% of that for CaWO_4:Pb was observed at 435nm under uv excitation. The Eu^<2+>-Sr^<2+> copolymer complex was more stable in the air and gave brighter emission than the Eu^<2+> copolymer complex did.E$fect of low molecular oligoethers on fluorscence properties of Eu^<2+>-poly-methacryloyloxymethyl-15・C・5 were studied. Eu^<2+>-PMA-15・C・5-15・C・5 complex yielded brighter emission than Eu^<2+>-PMA-15・C・5 complex did.