Abstract

A brief review of the theory of phosphors is given in terms of the electron-band picture of impurity semiconductors in order to show the reasons for researches designed to obtain the optical properties of phosphors. The automatic spectroradiometer is described since it is an instrument which yields so much information of value in phosphor research, development, and quality control. Some problems of spectroradiometer standardization are discussed in some detail, since the data obtained cannot be correctly interpreted by the I.C.I. system of color specification and interpretation unless satisfactory standards are maintained and used. A brief discussion is given of the application of the I.C.I. system to help in the choice of phosphors required to produce a suitable “white” for television cathode-ray tubes. Other researches discussed include the determination of phosphor excitation curves, the emission of light as a function of temperature and of time, and the correlation of spectral excitation and absorption data.

© 1949 Optical Society of America

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