Embodiments of the invention include a wavelength-converting material defined by AE.sub.3x1y+zRE.sub.3x2+yz[Si.sub.9wAl.sub.w(N.sub.1yC.sub.y).sup.[4](N.sub.16zwO.sub.z+w).sup.[2]]:Eu.sub.x1,Ce.sub.x2, where AE=Ca, Sr, Ba; RE=Y, Lu, La, Sc; 0x10.18; 0x20.2; x1+x2>0; 0y1; 0z3; 0w3.

A family of optionally substituted oxonitridoberyllosilicate photoluminescent compositions (i.e., phosphors) is characterized by the formula AE.sub.1?x?y?uA.sub.y+uBe.sub.1?y?z?vB.sub.y+z+vSi.sub.1?z Al.sub.zO.sub.1?vN.sub.2+v: Eu.sub.x,Ce.sub.u, where AE=Ba, Sr, Ca, Mg; A=Li, Na, K, Rb; 0?x?0.1; 0? u?0.1; 0<(x+u); 0?y?1; 0?z?1; (y+z+v)?1; and (x+y+u)?1. These phosphors may be used in phosphor converted LEDs which may be advantageously employed in illumination and display applications, for example.

Phosphors include a CaAlSiN.sub.3 family crystal phase, wherein the CaAlSiN.sub.3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

Embodiments of the invention include a wavelength-converting material defined by AE.sub.3x1y+zRE.sub.3x2+yz[Si.sub.9wAl.sub.w(N.sub.1yC.sub.y).sup.[4](N.sub.16zwO.sub.z+w).sup.[2]]:Eu.sub.x1,Ce.sub.x2, where AE=Ca, Sr, Ba; RE=Y, Lu, La, Sc; 0x10.18; 0x20.2; x1+x2>0; 0y1; 0z3; 0w3.

Embodiments of the invention include a wavelength-converting material defined by AE.sub.3x1y+zRE.sub.3x2+yz[Si.sub.9wAl.sub.w(N.sub.1yC.sub.y).sup.[4](N.sub.16zwO.sub.z+w).sup.[2]]Eu.sub.x1,Ce.sub.x2, where AE=Ca, Sr, Ba; RE=Y, Lu, La, Sc; 0x10.18; 0x20.2; x1+x2>0; 0y1; 0z3; 0w3.

The present disclosure relates to a fluorescent powder and a light-emitting device including the same. The fluorescent powder includes an inorganic compound. The inorganic compound contains components including an element M, an element A, an element D, an element E, and an element R. The element M is selected from Eu, Ce, Mn, Tb, Dy, and Tm, the element A is selected from Mg, Ca, Sr, and Ba, the element D is selected from B, Al, Ga, In, La, Gd, Sc, Lu, and Y, the element E is selected from Si, Ge, Zr, and Hf, and the element R is at least two elements selected from N, O, F, and Cl. In a powder X-Ray Diffraction (XRD) spectrum with CoK radiation, the inorganic compound at least has diffraction peaks within ranges of an Bragg angle (2) from 27.3 to 28.3, 29.7 to 30.7, 41.9 to 42.9, and 43.5 to 44.5.

Provided are an oxynitride phosphor comprising a JEM crystal as a main component and being characterized by light-emitting properties (light emission color or excitation property, light emission spectrum) that is different from the known JEM phosphor, and an application thereof. The phosphor of the present invention comprises the JEM crystal activated with Eu and represented by MAl(Si, Al).sub.6(O, N).sub.10 (where the M element is one or more elements selected from the group consisting of Ca, Sr, Eu, La, Sc, Y, and lanthanoid elements; and includes at least Eu as well as Ca and/or Sr).

The present invention discloses a nitroxide fluorescent powder comprising an inorganic compound containing M, A, B, O, N, and R elements; in which the M element is at least one of Ca, Sr, Ba, Mg, Li, Na, and K, the A element is at least one of B, Al, Ga, and In, the B element is at least one of C, Si, Ge, and Sn, the R element is at least one of Ce, Eu, Lu, Dy, Gd, and Ho, characterized in that the inorganic compound forms a crystal in a crystalline phase, and the oxygen atom content in the crystal in a crystalline phase is in an increasing structural distribution from a core to surface of the crystal. The nitroxide fluorescent powder and the nitroxide illuminant of the present invention have the advantages of good chemical stability, good aging and light decay resistance, and high luminescent efficiency, and are useful for various luminescent devices. The preparation method of the present invention is easy and reliable and useful for industrial mass production.

The present invention discloses a nitroxide fluorescent powder comprising an inorganic compound containing M, A, B, O, N, and R elements; in which the M element is at least one of Ca, Sr, Ba, Mg, Li, Na, and K, the A element is at least one of B, Al, Ga, and In, the B element is at least one of C, Si, Ge, and Sn, the R element is at least one of Ce, Eu, Lu, Dy, Gd, and Ho, characterized in that the inorganic compound forms a crystal in a crystalline phase, and the oxygen atom content in the crystal in a crystalline phase is in an increasing structural distribution from a core to surface of the crystal. The nitroxide fluorescent powder and the nitroxide illuminant of the present invention have the advantages of good chemical stability, good aging and light decay resistance, and high luminescent efficiency, and are useful for various luminescent devices. The preparation method of the present invention is easy and reliable and useful for industrial mass production.

Phosphors include a CaAlSiN.sub.3 family crystal phase, wherein the CaAlSiN.sub.3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.