The disclosure provides an LED white light device, including a blue light chip and phosphors. The blue light chip has a band of (455-470) nm. The phosphors include a dual-band yellow phosphor and a red phosphor having an excited light peak wavelength range of (610-660) nm. The yellow phosphor and the red phosphor are mixed according to a proportion of 1:(0.03-0.2) and cover the blue light chip, such that blue light emitted by the packaged LED white light device has a peak wavelength range of (450-465) nm. The disclosure also provides a preparation method of an LED white light device and an LED backlight module adopting the above LED white light device. The disclosure achieves the effects of blue light prevention, high color gamut and pure white simultaneously, the color uniformity and consistency are good, and a blue-green-red three-color continuous spectrum is provided, which is closer to a solar spectrum.

Provided are an oxynitride fluorescent material, a light emitting device, and a method for producing an oxynitride fluorescent material. The oxynitride fluorescent material containing a composition represented by the following formula (I): (Ba.sub.1aEu.sub.a).sub.1bM.sub.bSi.sub.2O.sub.2+cN.sub.2+d (I), wherein in the formula (I), M represents at least one element selected from the group consisting of rare earth elements excluding Eu and Sm; and a, b, c, and d each satisfy 0<a1.0, 0<b0.07, 0.3<c<0.3, and 0.3<d<0.3.

Provided is a nitride phosphor having two or more maximum absorption points in a range of 3,200 to 3,300 cm.sup.1 in an infrared absorption (FT-IR) spectrum. The nitride phosphor of the present invention has excellent emission characteristics and is highly reliable when used in devices.

Provided is a phosphor which emits near-infrared light upon irradiation of visible light or ultraviolet light. A phosphor in an embodiment of the present invention includes an inorganic substance which contains at least an Eu element, an M[3] element (M[3] is at least one selected from the group consisting of Al, Y, La and Gd.), a Si element and nitrogen element, and also contains, if necessary, at least one element selected from the group consisting of M[1] element (M[1] is Li element.), an M[2] element (M[2] is at least one element selected from the group consisting of Mg, Ca, Ba and Sr.) and an oxygen element, while the phosphor has a maximum value of an emission peak at a wavelength in the range of 760 nm or more and 850 nm and less upon irradiation by an excitation source.

Provided are an oxynitride fluorescent material, a light emitting device, and a method for producing an oxynitride fluorescent material. The oxynitride fluorescent material containing a composition represented by the following formula (I); (Ba.sub.1aEu.sub.a).sub.1bM.sub.bSi.sub.2O.sub.2+cN.sub.2+d (I), wherein in the formula (I), M represents at least one element selected from the group consisting of rare earth elements excluding Eu and Sm; and a, b, c, and d each satisfy 0<a1.0, 0<b0.07, 0.3<c<0.3, and 0.3<d<0.3.

Embodiments of the invention include a wavelength-converting composition as defined by R.sub.3?x?y?2A.sub.x+yM.sub.zSi.sup.6?w1Al.sub.w1O.sub.3x+y+w1N.sub.11?7x/3?y?w1?2?2x/3, with ? being vacancies of the structure that are filled by oxygen atoms with 0<x?3, ?3?y<3, 0<z<1,0?w1?6, 0?x+y, x?y+z?3, 11?7/3x?y?w1?0, and 3x+y+w1?13. R is selected from the group comprising trivalent La, Gd, Tb, Y, Lu; A is selected from the group comprising bivalent Ca, Mg, Sr, Ba, and Eu; and M is selected from the group comprising trivalent Ce, Pr and Sm.

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 invention relates to a complex oxynitride phosphor which is efficiently excited in the UV to near-UV wavelength region and emits green to yellow light, and a light emitting device using the phosphor. The phosphor according to the present invention is characterized in that it is represented by general formula: M1.sub.aM2.sub.bRe.sub.cSi.sub.dO.sub.eN.sub.f; wherein M1 is one or more elements selected from Y, Sc, La, and Al; M2 is one or more elements selected from Zn, Sr, Ba, Ca, and Mg; Re is one or more elements selected from Ce, Pr, Sm, Eu, Dy, Ho, Er, Tm, Yb, Ti, Cr, and Mn among rare-earth elements and transition metal elements; and a, b, c, d, e, and fin the formula satisfy the relationships:
a+b+c=1,
0.20<b<0.50,
0.001<c<0.10,
2.5<d<4.1,
0.5<e<1.0, and
3.5<f<5.6.

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 invention relates to a complex oxynitride phosphor which is efficiently excited in the UV to near-UV wavelength region and emits green to yellow light, and a light emitting device using the phosphor. The phosphor according to the present invention is characterized in that it is represented by general formula: M1.sub.aM2.sub.bRe.sub.cSi.sub.dO.sub.eN.sub.f; wherein M1 is one or more elements selected from Y, Sc, La, and Al; M2 is one or more elements selected from Zn, Sr, Ba, Ca, and Mg; Re is one or more elements selected from Ce, Pr, Sm, Eu, Dy, Ho, Er, Tm, Yb, Ti, Cr, and Mn among rare-earth elements and transition metal elements; and a, b, c, d, e, and fin the formula satisfy the relationships:

a+b+c=1,

0.20<b<0.50,

0.001<c<0.10,

2.5<d<4.1,

0.5<e<1.0, and

3.5<f<5.6