Fluorescent Properties of Red-Emitting Europium-Activated Phosphors with Cathode Ray Excitation

Some years ago data were reported on the efficien-cies of phosphors for color television tubes and, more-over, the lumen contributions of the blue, green, and red phosphors required for obtaining a white fluores-cence were calculated (1, 2). These calculations were made for various sets of pr imary phosphors for color television. The factors which together determine the lumen contributions for each pr imary phosphor are: (a) the radiant efficiency; (b) the lumen equivalent (i.e., the lumen efficiency for 100 % radiant efficiency); (c) the