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- W4313593321 abstract "The green-emitting SrSi2O2N2:Eu2+ and red-emitting Sr2Si5N8:Eu2+ phosphors for white LED application were prepared by direct silicon nitridation and Sr(NO3)2 as Sr and O2 sources. In addition, the effect of related synthesis parameters, including nitridation temperature, the particle size of silicon on the photoluminescence behaviors, and the microstructures of phosphors, were explored in detail. Results showed that the Sr2SiO4 and SrSi2O2N2 phases were first presented at 1370 °C. Then, the Sr2SiO4 phase gradually disappeared, and a pure SrSi2O2N2 phase was obtained. The emission intensity of SrSi2O2N2:Eu2+ phosphors at 530 nm increased with nitridation temperatures from 1370 to 1450 °C under 370 nm UV excitation. When the nitridation temperature was further raised to 1470 °C, the ratios of nitrogen to oxygen and Si to Sr increased. The Sr2Si5N8:Eu2+ phase was formed by dissipating SrSi2O2N2:Eu2+. Further, the particle size of starting silicon impacts the emission intensity and thermal quenching of SrSi2O2N2:Eu2+ phosphors. The smaller the particle size of Si powders, the stronger are the emission intensity at 530 nm and thermal quenching resistance of SrSi2O2N2:Eu2+ phosphors. The higher N/O ratio also leads to a slightly lower emission intensity and thermal quenching resistance of SrSi2O2N2:Eu2+. Moreover, the possible formation reaction mechanism of SrSi2O2N2 and Sr2Si5N8 was also discussed." @default.
- W4313593321 created "2023-01-06" @default.
- W4313593321 creator A5020471292 @default.
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- W4313593321 date "2023-03-01" @default.
- W4313593321 modified "2023-10-17" @default.
- W4313593321 title "The preparation of SrSi2O2N2:Eu2+ and Sr2Si5N8:Eu2+ phosphors by a direct silicon nitridation process and Sr(NO3)2 as strontium and oxygen sources" @default.
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- W4313593321 doi "https://doi.org/10.1016/j.matchemphys.2023.127317" @default.
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