Europium- and strontium-based phosphor

1. A phosphor of formula:

M 1 ′ a′ Sr b′ Ca c′ M 2 ′ d′ Al e′ Si f′ N g′

wherein a′, b′, c′, d′, e′, f′, and g′ satisfy:

0.00001≦a′≦0.15;

0.6≦b′≦0.99999;

0≦c′<1;

0≦d′<1;

a′+b′+c′+d′=1;

0.5≦e′≦1.5;

0.5≦f′≦1.5; and

2.5≦g′≦3.5;

M 1 ′ is Eu;

M 2 ′ is Mg, Ba, or both;

at least 85 mol % of M 1 ′ is Eu 2+ ;

the phosphor has a peak emission wavelength of from 590 nm to 650 nm; and

the phosphor comprises oxygen in an amount of 5 wt % or less.

2. The phosphor according to claim 1 ,

wherein, in a Fourier transform of an EXAFS spectrum of an Eu-L 3 absorption edge or an Eu—K absorption edge, the phosphor has an intensity of a peak corresponding to a first vicinal atom of 50% or more of an intensity of a peak corresponding to a second vicinal atom;

the first vicinal atom is an N anion or an O anion; and

the second vicinal atom is a Si cation, an Al cation, a Sr cation, or a Ca cation.

3. A composition comprising the phosphor according to claim 1 and a liquid medium.

4. A light-emitting device, comprising:

an excitation light source; and

a phosphorescent body suitable for converting a wavelength of at least a portion of light emitted from the excitation light source;

wherein the phosphorescent body comprises a first phosphor that is the phosphor according to claim 1 .

5. The light-emitting device according claim 4 ,wherein the phosphorescent body further comprises a second phosphor having a different peak emission wavelength from the first phosphor.

6. A display, comprising the light-emitting device according to claim 4 .

7. A lighting system, comprising the light-emitting device according to claim 4 .