Rare earth oxysulfide phosphor and high resolution cathode ray tube employing it.

摘要

A rare earth oxysulfide phosphor of the formula (Ln1-x-yLaxLn'y)2O2S wherein Ln is at least one element selected from the group consisting of Y, Gd, Sc and Lu, Ln' is at least one element selected from the group consisting of Eu, Tb, Sm, Er, Tm, Dy, Ho, Nd and Pr, and x and y are numbers within ranges of 0.005<x</=0.07 and 0.0001</=y</=0.2, respectively.