TY JOUR TI Glass composite materials for light converters of optoelectronic devices KW low-melting glasses KW phosphor KW light-converting coatings KW bismuth oxide KW boron oxide JO Technique and technology of silicates AU Bobkova, N.M. AU Trusova, E.E. PY 2018 IS 25 PB Individual Entrepreneur Svetlana Vasilievna Samchenko