Image display device having a long-life phosphor layer

A display comprising a faceplate on which a phosphor layer is formed and an electron source which irradiates an electron beam onto said phosphor layer, wherein

• the phosphor constituting said phosphor layer has the component ZnS:M,N where M is one or more elements selected from Cu, Ag and Au, and N is one or more elements selected from Al, Ga, In, and Cl, and
• the temperature characteristics, which are obtained by detecting the amount of luminescence while increasing the temperature of the phosphor at a constant heating rate by exciting the phosphor with light of 168 nm vacuum-ultraviolet rays, have a peak in the amount of luminescence at around 190K
• wherein said phosphor layer comprises
• a highly crystalline first layer comprising ZnS:M,N and having a small amount of sulfur vacancies at the surface of the phosphor constituting said phosphor layer;
• and
• a second layer comprising ZnS:M,N and having a higher concentration of element M, and
• wherein the N/M mole ratio of said second layer is 0.5 or less, and the N/M mole ratio of the entire phosphor is 1.0 or more.