Patent ID: 7651631

Claim:
A phosphor comprising: a composition represented by chemical formula 1: (Sr (1-x-y) Ca x Ba y )D a S 4 :Eu, where D is (Ga (1-m-n) Al m In n ) Chemical formula 1 wherein a concentration of europium (Eu) ranges from 1 to 9 mole percent, 0≦x≦1, 0≦y≦1, and x+y≦1, 0≦m≦1, 0≦n≦1, and m+n≦1, and a is about 2; and an excess of D, where any Ga, Al and In existing in the excess of D is in non-elemental form, wherein a total amount of D includes the D in the composition and the excess of D, and a ratio of the total amount of D to a total amount of (Sr+Ca+Ba) in the composition ranges from 2.8 to 5.9, and wherein a main absorption wavelength range of the excitation is any one of a first wavelength range that overlaps an entirety of a reference wavelength range ranging from 380 to 400 nm and extends to a shorter wavelength side and a second wavelength range that overlaps an entirety of the reference wavelength range and extends to a longer wavelength side according to the value a.