A new orange-emitting phosphor, (Ca, Mg)S:Mn, was developed to replace a Cd compound, Cd,~,(PO4),~C12:Mn, which is potentially an environmental problem. With 1.5% Mg and 0.8% Mn, the emission color of (Ca, Mg)S:Mn is equal to the brightness ofa 9 or 12 in. monochromatic tube and is 20% higher than that of Cd,,,(PO4)~Cl_
Elementary processes of hydrolysis were studied on
normalCaS:normalCe
and
false(normalCa,normalMgfalse)S:normalMn
phosphors by ion chromatography. Analysis of a phosphor suspension solution has shown that oxidation of SH− producing
SO32−
and
SO42−
, as well as formation of
CaCO3
accelerates the overall hydrolysis. On the basis of these results, methods of suppressing hydrolysis were examined and used to develop a screening process for monochromatic tubes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.