| abstract |
A lighting apparatus comprising: a light source configured to emit radiation with a peak intensity at a wavelength between 250 nm and 550 nm; and a phosphorus composition comprising a blue-green to green phosphorus having a peak emission wavelength between 485 nm and 540 nm, using an excitation wavelength of 405 nm, configured to be radiatively coupled to the light source, of formula ((Sr1-zMz) 1- (x + w) AwCex) 3 (Al1-ySiy) O4 + y + 3 (xw) F1-y-3 (xw), in which 0 <x <= 0, 0 <= y <= 0.5, 0 <= z <= 0.5, 0 <= w <= x, A is Li, Na, K, or any combination thereof, and M is Ca, Ba, Mg or any combination thereof. |