Phosphor, light-emitting device and use thereof

摘要

The present invention provides: a phosphor which can be combined with a blue LED to emit white light having a low color temperature as in the case where the phosphor is used singly, has a broad fluorescence spectrum, high light emission efficiency, and thermal/chemical stability, and rarely undergoes the deterioration in brightness at higher temperatures. This phosphor is represented by the general formula: Mx(Si,Al)2(N,O)3±y (wherein M independently represent Li or at least one alkali earth metal element; and x and y fulfill the requirement represented by the formulae: 0.52≦x≦0.9 and 0≦y≦0.3) wherein some of M are substituted by element Ce, and wherein the Si/Al atomic ratio is 1.5 to 6 inclusive, the O/N atomic ratio is 0 to 0.1 inclusive, 5-50 mol % of M's is Li, and 0.5-10 mol % of M is Ce.

主权项

1. A phosphor represented by formula Mx(Si,Al)2(N,O)3±y, provided that M is Li and at least one alkaline earth metal element, 0.52≦x≦0.9, 0.06≦y≦0.23, and part of M is replaced by element Ce, wherein an Si/Al atomic ratio is 1.5 or greater and 6 or less, an o/N atomic ratio is 0 or greater and 0.1 or less, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce, having an orthorhombic crystal structure and comprising a crystal with lattice constant a of 0.935 to 0.965 nm, a lattice constant b of 0.550 to 0.570 nm, and a lattice constant c of 0.480 to 0.500 nm.