Material for converting ultraviolet ray and display device using the same

A display device comprising

• a first substrate comprising a dielectric and a protective film for protecting the dielectric;
• a second substrate comprising a partition wall and a fluorescent material layer opposing to the first substrate;
• a rare gas filling space formed between the first substrate and the second substrate;
• an exciting means for exciting the fluorescent material layer by discharge of the dilute gas and for controlling lightening of a plurality of pixels;
• and
• a means for converting ultraviolet ray around the fluorescent material layer,
• wherein the material for converting ultraviolet ray comprises gadolinium in a base substrate, and generates, by ultraviolet ray irradiation, ultraviolet ray having a longer wavelength than the irradiated ultraviolet ray.