PHOSPHOR AND METHOD FOR PRODUCTION THEREOF, AND APPLICATION THEREOF
First Claim
1. A phosphor comprising a crystal phase having a chemical composition expressed by the following general formula [1], and providing an average variation rate of the emission intensity of 1.3 or less upon excitation with light having a peak in the wavelength range of 420 nm to 480 nm, the variation rate of the emission intensity being calculated by the following general formula [2]:
-
(Ln1-a-bCeaTbb)3M5O12
[1]wherein Ln is at least one element selected from the group consisting of Y, Gd, Sc, Lu, and La, M represents at least one element selected from the group consisting of Al, Ga, and In, and a and b satisfy 0.001≦
a≦
0.3 and 0≦
b≦
0.5, respectively.
Variation rate of emission intensity=[(I(λ
+1)−
I(λ
)/I(λ
)]2
[2]wherein I(λ
) is the emission intensity of the phosphor at an excitation wavelength of λ
nm, and I(λ
+1) is the emission intensity of the phosphor at an excitation wavelength of (λ
+1) nm.
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Accused Products
Abstract
A phosphor containing a crystal phase having a chemical composition expressed by the following general formula [1], and exhibiting an average variation rate of the emission intensity of 1.3 or less upon excitation with light having a peak in the wavelength range of 420 nm to 480 nm, the variation rate of the emission intensity being calculated by the following general formula [2].
(Ln1-a-bCeaTbb)3M5O12 [1]
- wherein Ln is at least one element selected from the group consisting of Y, Gd, Sc, Lu, and La, M represents at least one element selected from the group consisting of Al, Ga, and In, and a and b satisfy 0.001≦a≦0.3 and 0≦b≦0.5, respectively.
Variation rate of emission intensity=[(I(λ+1)−I(λ))/I(λ)]2 [2]
- wherein I(λ) is the emission intensity of the phosphor at an excitation wavelength of λnm, and I(λ+1) is the emission intensity of the phosphor at an excitation wavelength of (λ+1) nm.
-
Citations
23 Claims
-
1. A phosphor comprising a crystal phase having a chemical composition expressed by the following general formula [1], and providing an average variation rate of the emission intensity of 1.3 or less upon excitation with light having a peak in the wavelength range of 420 nm to 480 nm, the variation rate of the emission intensity being calculated by the following general formula [2]:
-
(Ln1-a-bCeaTbb)3M5O12
[1]wherein Ln is at least one element selected from the group consisting of Y, Gd, Sc, Lu, and La, M represents at least one element selected from the group consisting of Al, Ga, and In, and a and b satisfy 0.001≦
a≦
0.3 and 0≦
b≦
0.5, respectively.
Variation rate of emission intensity=[(I(λ
+1)−
I(λ
)/I(λ
)]2
[2]wherein I(λ
) is the emission intensity of the phosphor at an excitation wavelength of λ
nm, and I(λ
+1) is the emission intensity of the phosphor at an excitation wavelength of (λ
+1) nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 16, 19, 20, 21, 22, 23)
-
-
13. A phosphor which has an object color satisfying L*≧
- 90, a*≦
−
7, and b*≧
55 under a color system of L*, a*, and b*, comprises a crystal phase having a chemical composition expressed by the following general formula [1], and has a median diameter D50 of 15 μ
m or more;
(Ln1-a-bCeaTbb)3M5O12
[1]wherein Ln is at least one element selected from the group consisting of Y, Gd, Sc, Lu, and La, M represents at least one element selected from the group consisting of Al, Ga, and In, and a and b satisfy 0.001≦
a≦
0.3 and 0≦
b≦
0.5, respectively. - View Dependent Claims (14, 17, 18)
- 90, a*≦
Specification