| 摘要 |
NEW MATERIAL:A compound shown by the formula [A is Mg, Sr, etc.; MI is Mn or Sm; MII is Sc, Y, etc.; MIII is Li, Na, etc.; MIV is Ce, Sb, etc.; alpha-epsilon are concentration (mol%) of activator based on parent material and alpha is 5X10<-6>-1X10<-1>; beta and epsilon are 0-1X10<-1> with the proviso that beta is 5X10<-7>-1X10<-1> when MI is Mn; gamma and delta are 1X10<-5>-1X10<-1>; epsilon is 0-1X10<-1>; x is composition ratio and 0-0.1]. EXAMPLE:A compound having a composition of CaS: 0.025 Mn, 0.006 Sc, 0.05 Cu, 0.06 Na. USE:A white luminescent fluorescent substance having high luminance and long afterglow suitable for Braun tube for display. The fluorescent substance is harmless and has no flicker, no color unevenness, etc. PREPARATION:For example, a raw material compound consisting of a Ca compound such as CaCO3, etc., an Mn compound such as manganese carbonate, etc., an Sc compound such as scandium oxide, etc., a copper compound such as copper oxide, etc., or an alkaline metallic compound such as sodium carbonate, etc., is calcined in a sulfurizing atmosphere.
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