Patent ID: 8394295

Claim:
A lighting device, comprising: an LED that emits light having a wavelength of 330 nm to 420 nm, and a fluorescent material, wherein the fluorescent material includes at least an oxynitride fluorescent material comprising a JEM phase as a mother crystal; and a luminescence center element Ce, wherein the JEM phase is expressed as a general formula MA1(Si 6-z Al z )N 10-z O z , where M is at least an element selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu and 0.1≦z≦3, and M, Si, Al, O, and N are expressed as a compositional formula M a Si b Al c O d N e , where a=1, and satisfying all of the following conditions: b =(6 −z )× f (i), c =(1 +z )× g (ii), d=z×h (iii), e =(10 −z )× i (iv), 0.1 ≦z≦ 3 (v), 0.7 ≦f≦ 1.3 (vi), 0.7 ≦g≦ 3 (vii), 0.7 ≦h≦ 3 (viii), and 0.7 ≦i≦ 1.3 (ix), and the oxynitride fluorescent material has a fluorescence spectrum with a maximum emission wavelength of 420 nm to 500 nm inclusive and an excitation spectrum with a maximum excitation wavelength of 250 nm to 400 nm inclusive, and the fluorescent material further includes a yellow fluorescent material that emits light having a wavelength of 550 nm to 600 nm inclusive in response to excitation light of 330 nm to 420 nm so as to emit white light.