A nitride phosphor having a composition containing Eu, Si, Al, N, and a group 2 element including at least one selected from the group consisting of Mg, Ca, Sr, and Ba. In the composition, a ratio of a total molar content of the group 2 element and Eu to a molar content of Al is 0.8 or more and 1.1 or less, a molar ratio of Eu is 0.002 or more and 0.08 or less, a molar ratio of Si is 0.8 or more and 1.2 or less, and a total molar ratio of Si and Al is 1.8 or more and 2.2 or less. The nitride phosphor has a first peak in a range of 17° 2θ or more and 19° 2θ or less and a second peak in a range of 34° 2θ or more and 35.5° 2θ or less in a CuKα powder X-ray diffraction pattern.

The present invention belongs to the technical field of inorganic luminescent materials, particularly relates to a nitride fluorescent material, and further discloses a light-emitting device containing such a fluorescent material. The nitride fluorescent material contains a compound with a structure like M.sub.mAl.sub.xSi.sub.yN.sub.3: aR, bEu, cCe. The fluorescent material has very high physical stability and chemical stability, and the fluorescent material is better in crystallization, and thus has relatively high external quantum efficiency. When being applied to a light-emitting device, the fluorescent material can fully exert the advantages of good stability and high external quantum efficiency, and the light-emitting efficiency and stability of the light-emitting device can be further improved.

An inorganic oxide of the present invention has a composition represented by General formula (1): M.sub.2LnX.sub.2(AlO.sub.4).sub.3 (where M includes Ca, Ln includes Tb, and X includes at least either one of Zr and Hf). Then, a number of Tb atoms in General formula (1) is 0.1 or more to 1 or less. Moreover, a crystal structure of the inorganic oxide is a garnet structure. A phosphor made of this inorganic oxide is capable of being excited by short-wavelength visible light, and can radiate narrow-band green light.

A light-emitting device (1) includes a substrate (2); a wiring pattern (3), an electrode land (4), a sealing resin layer (5), a wire (7), and a resin dam (9) that are disposed on the substrate (2); at least one light-emitting element (6) that emits light having a peak emission wavelength in a wavelength range of 430 to 480 nm; a green phosphor (10) that is excited by primary light emitted from the light-emitting element (6) to emit light having a peak emission wavelength in a green region; and a first red phosphor (11) that is excited by the primary light to emit light having a peak emission wavelength in a red region. The first red phosphor (11) emits no light in a wavelength range of 700 nm or more and absorbs no light in a wavelength range of 550 to 600 nm.

A luminescent composition of matter is characterized by the formula REM.sub.2+xE.sub.y, where RE may be one or more Rare Earth elements (for example, Eu or Gd), M may be one or more elements selected from the group Al, Ga, B, In, Sc, Lu, and Y; E is one or more elements selected from the group S, Se, O, and Te; x is greater than zero; and y has the value that achieves charge balance in the formula assuming that E has a charge of 2.

A semiconductor device or a crystal that suppresses phase transition of a corundum structured oxide crystal at high temperatures is provided. According to the present invention, a semiconductor device or a crystal structure is provided, including a corundum structured oxide crystal containing one or both of indium atoms and gallium atoms, wherein the oxide crystal contains aluminum atoms at least in interstices between lattice points of a crystal lattice.

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).

A phosphor is disclosed. In an embodiment a phosphor includes an inorganic substance which includes, in its composition, at least an element D, an element A1, an element AX, an element SX and an element NX where D includes one, two or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, alkali metals and Yb, A1 includes one, two or more elements selected from the group consisting of divalent metals not included in D, SX includes one, two or more elements selected from the group consisting of tetravalent metals, AX includes one, two or more elements selected from the group consisting of trivalent metals, and NX includes one, two or more elements selected from the group consisting of O, N, S, C, Cl, and F, wherein the inorganic substance has the same crystal structure as Sr(Sr.sub.aCa.sub.1-a)Si.sub.2Al.sub.2N.sub.61.

A phosphor is disclosed. In an embodiment a phosphor includes an inorganic substance which includes, in its composition, at least an element D, an element Al, an element AX, an element SX and an element NX where D includes one, two or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, alkali metals and Yb, Al includes one, two or more elements selected from the group consisting of divalent metals not included in D, SX includes one, two or more elements selected from the group consisting of tetravalent metals, AX includes one, two or more elements selected from the group consisting of trivalent metals, and NX includes one, two or more elements selected from the group consisting of O, N, S, C, Cl, and F, wherein the inorganic substance has the same crystal structure as Sr(Sr.sub.aCa.sub.1-a)Si.sub.2Al.sub.2N.sub.61.

Disclosed are smoothing phosphors for AC LED lighting that are capable of prolonging the light emission time of an AC LED (or array of AC LEDs) during a cycle response to a, phase change of the alternating current to substantially reduce flicker. The smoothing phoshor of the present teachings comprises a matrix represented by the formula: (1krv)M.Math.(mp)X.Math.(n0.5x0.5y)Al.sub.2O.sub.3:(x+p)MnO, ySiO.sub.2, kEu, rR, vLi, wherein M is at least one of La.sub.2O.sub.3, Ce.sub.2O.sub.3, Gd.sub.2O.sub.3, Lu.sub.2O.sub.3, Ba.sub.2OF.sub.2, Sr.sub.2OF.sub.2, Ca.sub.2OF.sub.2, Ba.sub.2OCl.sub.2, Sr.sub.2OCl.sub.2, Ca.sub.2OCl, BaO, SrO, CaO, or ZnO; provided that when M comprises BaO, SrO, CaO, or ZnO, M does not comprise La.sub.2O.sub.3, Ce.sub.2O.sub.3, Gd.sub.2O.sub.3, Lu.sub.2O.sub.3, Ba.sub.2OF.sub.2, Sr.sub.2OF.sub.2, Ca.sub.2OF.sub.2, Ba.sub.2OCl.sub.2, Sr.sub.2OCl.sub.2, or Ca.sub.2OCl.sub.2; X is at least one of MgO or ZnO; R is at least one of Sm, Pr, Tb, Dy, Er, or Ho; m=0 to 2; n=4 to 11; x=0.005 to 1; y=0.005 to 1; p=0 to 1; k=0 to 0.2; r=0 to 0.2; and v=0 to 0.2.