Light-emitting device having a plurality of emission layers
First Claim
1. A light-emitting device comprising:
- a first emission layer formed apart from a light-emitting surface with a plurality of layers interposed therebetween, and having a first maximum wavelength region λ
X; and
a second emission layer formed on said first emission layer to provide a laminated structure, the second emission layer having a second maximum wavelength region λ
Y that is different from said first maximum wavelength region λ
X, wherein a first optical film thickness range L1 from a light-emitting position of said first emission layer to said light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of said second emission layer to said light-emitting surface, and respective film thicknesses of said plurality of layers, said first emission layer and said second emission layer are set, so as to increase the luminous intensity of color of an emission produced by mixing an emission from said first emission layer with an emission from said second emission layer.
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Accused Products
Abstract
A light-emitting device including a plurality of emission layers, which has improved luminous efficiency and improved emission lifetime, is provided. In the light-emitting device, a first optical film thickness range L1 from a light-emitting position of a first emission layer to a light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of a second emission layer to the device light-emitting surface, and film thicknesses of a plurality of layers between the light-emitting surface and the first emission layer, the first emission layer and the second emission layer are set so as to increase the luminous intensity of color of an emission produced by mixing an emission from the first emission layer with an emission from the second emission layer.
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Citations
14 Claims
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1. A light-emitting device comprising:
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a first emission layer formed apart from a light-emitting surface with a plurality of layers interposed therebetween, and having a first maximum wavelength region λ
X; and
a second emission layer formed on said first emission layer to provide a laminated structure, the second emission layer having a second maximum wavelength region λ
Y that is different from said first maximum wavelength region λ
X, wherein a first optical film thickness range L1 from a light-emitting position of said first emission layer to said light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of said second emission layer to said light-emitting surface, and respective film thicknesses of said plurality of layers, said first emission layer and said second emission layer are set, so as to increase the luminous intensity of color of an emission produced by mixing an emission from said first emission layer with an emission from said second emission layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light-emitting device comprising:
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a first emission layer formed apart from a light-emitting surface with a plurality of layers interposed therebetween, and having a first maximum wavelength region λ
X; and
a second emission layer formed on said first emission layer to provide a laminated structure, the second emission layer having a second maximum wavelength region λ
Y that is different from said first maximum wavelength region λ
X, whereina first optical film thickness range L1 from a light-emitting position of said first emission layer to said light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of said second emission layer to said light-emitting surface, and respective film thicknesses of said plurality of layers, said first emission layer and said second emission layer are set according to expressions as follows, so as to increase the luminous intensity of color of an emission produced by mixing an emission from said first emission layer with an emission from said second emission layer; L1=λ
X/4×
m1=n11d1+n21d2+ . . . +nk1dkL2=λ
Y/4×
m2=n12d1+n22d2+ . . . +nk2dkm1, m2;
positive integer equal to or larger than 1 (on conditions that decimal fractions of m1 and m2 are equal to or smaller than 0.2 or equal to or larger than 0.8)d1, d2, . . . dk;
film thickness of each layern11, n21, . . . nk1;
index of refraction of each layer at λ
Xn12, n22, . . . nk2;
index of refraction of each layer at λ
Y.
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8. A light-emitting device comprising:
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a first emission layer formed apart from a light-emitting surface with a plurality of layers interposed therebetween, and having a first maximum wavelength region λ
X; and
a second emission layer formed on said first emission layer to provide a laminated structure, the second emission layer having a second maximum wavelength region λ
Y that is different from said first maximum wavelength region λ
X, whereina first optical film thickness range L1 from a light-emitting position of said first emission layer to said light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of said second emission layer to said light-emitting surface, and respective film thicknesses of said plurality of layers, said first emission layer and said second emission layer are set, so as to increase the luminous intensity in the first maximum wavelength region λ
X of an emission spectrum provided by said first emission layer, and increase the luminous intensity in the second maximum wavelength region λ
Y of an emission spectrum provided by said second emission layer. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A light-emitting device comprising:
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a first emission layer formed apart from a light-emitting surface with a plurality of layers interposed therebetween, and having a first maximum wavelength region λ
X; and
a second emission layer formed on said first emission layer to provide a laminated structure, the second emission layer having a second maximum wavelength region λ
Y that is different from said first maximum wavelength region λ
X, whereina first optical film thickness range L1 from a light-emitting position of said first emission layer to said light-emitting surface of the device, a second optical film thickness range L2 from a light-emitting position of said second emission layer to said light-emitting surface, and respective film thicknesses of said plurality of layers, said first emission layer and said second emission layer are set according to expressions as follows, so as to increase the luminous intensity in the first maximum wavelength region λ
X of an emission spectrum provided by said first emission layer, and increase the luminous intensity in the second maximum wavelength region λ
Y of an emission spectrum provided by said second emission layer;L1=λ
X/4×
m1=n11d1+n21d2+ . . . +nk1dkL1=λ
Y/4×
m1=n12d1+n22d2+ . . . +nk2dkm1, m2;
positive integer equal to or larger than 1 (on conditions that decimal fractions of m1 and m2 are equal to or smaller than 0.2 or equal to or larger than 0.8)d1, d2, . . . dk;
film thickness of each layern11, n21, . . . nk1;
index of refraction of each layer at λ
X n12, n22, . . . nk2;
index of refraction of each layer at λ
Y.
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Specification