| abstract |
(57) [Abstract] (With correction) [Problem] When a fluorescent film of a color cathode ray tube is formed, the adhesive strength, cutting, and filling rate of the fluorescent film are improved, and the fog on the glass surface is reduced, so that high definition and high resolution are achieved. Providing a bright fluorescent film. SOLUTION: The area and perimeter of a projected image of a particle when the particle is projected from one direction are S and M, respectively. When the length of the circumference of a perfect circle whose area is the same as the area of the projected image is L, and L / M is defined as the circularity of each particle, the average value of the circularity of each particle. Is a zinc sulfide phosphor composed of a group of particles having a particle size of 0.955 or more. |