luminescent sheets of high intrinsic brilliance

luminescent sheets also relates to the manufacture of luminescent materials and luminescent members for use in my improved types of lamps. It is therefore a further object of my invention to 5( provide a method of manufacturing luminescent materials and luminescent members particularly, although not exclusively, for lamp use and with which exceptionally high intrinsic brilliancies may be obtained. In accordance with photoluminescent pigment I provide a fluorescent lamp excitable by corpuscular energy such as alpha-particles, mercury vapor discharge vapor-rare gas discharge, electron discharge, or by radiant energy such as ultra violet radiation, radioactive disintegration products, X-rays or combinations thereof, wherein the material which becomes excited under the incident energy comprises elongated phosphor bodies of luminescing solids. Further in accordance with photoluminescent pigments I provide means, to utilize the cumulative effect of a plurality of luminescing solids comprising transparent phosphor members and/or an extended excitation volume in a transparent luminescent solid. Still further in accordance with my invention I provide a new form of fluorescent member and a method of manufacturing the materials comprising such members whereby large elongated crystals of solid phosphor are obtained.