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SYNTHESIS AND SPECTRA CHARACTERISTICS OF Ca 1-n Ba n S:Cu + ,Eu 2+ PHOSPHORS

The fluorescence of Cu + , Eu 2+ coactivated Ca 1-n Ba n S is reported in this paper The blue emission band (about 416 nm) of Cu + and the red emission band (about 630 nm) of Eu 2+ in the CaS host are shifted to the green area and the ratio of their intensity changes also with increasing Ba composition in Ca 1-n Ba n S The experimental results indicate that Ca 1-n Ba n S:0 005Cu + ,0 001 Eu 2+ is a light transforming material of monohost with two emissions, in which the red and blue emission intensities can be adjusted by changing Ba composition in the host