Cold cathode fluorescent lamp blue emitting alkaline earth chlorophosphate phosphor, a cold cathode fluorescent lamp, and the color liquid crystal display device.

摘要

(However, the present _{invention, (Sr 10-k-l-m-n} Ba _{k Ca} l Mg _m Eu _n) (PO ₄₎ 6 Cl ₂ 0 _k ≦ 1.5,0 ≦ l ≦ _1.2, blue light-emitting cold cathode fluorescent lamp for alkaline earth-chloro-phosphate phosphor represented by 0.05 ≦ n ≦ 0.3) and 0 ≦ _m ≦ _{0.25, (Sr 10-k-l-m-n} Ba However _{(, k} Ca _l Mg _m Eu _n) (PO ₄₎ 6 Cl ₂ 0.05 ≦ _n ≦ and 1.2,0 ≦ m ≦ 0.25 0 ≦ k ≦ 1.5,0 ≦ l ≦ 0. cold cathode fluorescent lamp using a blue light emitting phosphor expressed at 3), relates to a color liquid crystal display device used as a backlight for the lamp. UV under excitation wavelength 180~300nm, changes in emission chromaticity and emission brightness decreases with time is small, when used as a backlight of a liquid crystal display in particular, the phosphor of the present invention, an image display color reproduction range is wide it is possible to.