There is a [ess absorption to the blue light when chromoticity coordinates of the color-body of yellow-component in white phosphor decreases to

x

=0.4599

y

=0.4224. The color temperature of white phosphor doesn't change with coating density.This paper has discussed the quantitative-relation of phosphor's color tem-perature with the factors

such as

weight coating density

dispersivity and particle size etc. The formcla W-kd

c

has been introduced to compute the proper weight according to the differences of the particle sizes of phosphor. And indicate that increasing the dispersion and decreasing the suitable weight of phosphor will cause the results

that is

excellent screens color uniformity and higher resolving power are obtained and"yellow-centr"as been improved.