SILICATE PHOSPHOR, METHOD OF MANUFACTURING SILICATE PHOSPHOR, AND LIGHT-GENERATING DEVICE HAVING SILICATE PHOSPHOR
First Claim
1. A silicate phosphor having a γ
- -phase of an orthorhombic crystal structure of a Pbnm 62 space group, and being represented by the following Chemical Formula 1,
Ca2-x-y-zMxSiO4;
yCe3+,zN(0≦
x<
0.5,0<
y≦
0.1,0≦
z<
0.15)
<
Chemical Formula 1>
wherein M represents at least one member selected from the group consisting of Mg, Sr, Ba, Zn, Na, Al, Ga, Ge, P, As and Fe, and N represents at least one member selected from the group consisting of Eu2+, Mn2+, Tb3+, Yb2+ and Tm3+.
2 Assignments
0 Petitions
Accused Products
Abstract
A silicate phosphor composition is provided having a γ-phase of an orthorhombic crystal structure whose space group is Pbnm 62, and whose composition is represented by the following chemical formula:
Ca2-x-y-zMxSiO4:yCe3+,zN(0≦x<0.5,0<y≦0.1,0≦z<0.15)
In the formula, M represents at least one member selected from the group consisting of Mg, Sr, Ba, Zn, Na, Al, Ga, Ge, P, As and Fe, and N represents at least one member selected from the group consisting of Eu2+, Mn2+, Tb3+, Yb2+ and Tm3+. The silicate phosphor has a maximum absorbance for a wavelength of about 450 nm to about 475 nm corresponding to a main part of a blue excitation light, and has a great stability at a high temperature. As such the silicate phosphor may be used in combination with a blue light source to produce a white light.
-
Citations
20 Claims
-
1. A silicate phosphor having a γ
- -phase of an orthorhombic crystal structure of a Pbnm 62 space group, and being represented by the following Chemical Formula 1,
Ca2-x-y-zMxSiO4;
yCe3+,zN(0≦
x<
0.5,0<
y≦
0.1,0≦
z<
0.15)
<
Chemical Formula 1>wherein M represents at least one member selected from the group consisting of Mg, Sr, Ba, Zn, Na, Al, Ga, Ge, P, As and Fe, and N represents at least one member selected from the group consisting of Eu2+, Mn2+, Tb3+, Yb2+ and Tm3+. - View Dependent Claims (2, 3, 4)
- -phase of an orthorhombic crystal structure of a Pbnm 62 space group, and being represented by the following Chemical Formula 1,
-
5. A method of manufacturing a silicate phosphor, the method comprising:
-
preparing a raw-materials mixture including a Ca-containing compound, a Si-containing compound and a Ce-containing compound; sintering the raw-material mixture; and cooling the sintered raw-material mixture to obtain a solidified silicate phosphor having a γ
-phase of an orthorhombic crystal structure whose space group is Pbnm 62, and whose composition is represented by the following Chemical Formula 1,
Ca2-x-y-zMxSiO4;
yCe3+,zN(0≦
x<
0.5,0<
y≦
0.1,0≦
z<
0.15)
<
Chemical Formula 1>wherein M represents at least one member selected from the group consisting of Mg, Sr, Ba, Zn, Na, Al, Ga, Ge, P, As and Fe, and N represents at least one member selected from the group consisting of Eu2+, Mn2+, Tb3+, Yb2+ and Tm3+. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A light-emitting device comprising:
-
a light source structured for generating at least an excitational light having a predetermined excitational wavelength; and a silicate phosphor disposed to be excited by the excitational light to responsively emit a light having a wavelength longer than the predetermined excitational wavelength, the silicate phosphor having a γ
-phase of an orthorhombic crystal structure whose space group is Pbnm 62, and whose composition is represented by the following Chemical Formula 1,
Ca2-x-y-zMxSiO4;
yCe3+,zN(0≦
x<
0.5,0<
y≦
0.1,0≦
z<
0.15)
<
Chemical Formula 1>wherein M represents at least one member selected from the group consisting of Mg, Sr, Ba, Zn, Na, Al, Ga, Ge, P, As and Fe, and N represents at least member one selected from the group consisting of Eu2+, Mn2+, Tb3+, Yb2+ and Tm3+. - View Dependent Claims (17, 18, 19, 20)
-
Specification