Light emitting device
First Claim
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1. A light emitting device, comprising:
- a light-emitting element comprising a Group III nitride compound semiconductor and including a light-emitting layer emitting light with an emission peak wavelength in an ultraviolet region and light with an emission peak wavelength in a visible region; and
a fluorescent material excited by said light in the ultraviolet region to emit light with a wavelength different from that of said excitation light, wherein the light-emitting layer includes a region of Alx1Ga1-x1-x2Inx2N(0<
x1<
1, 0<
x2<
1, x1>
x2) emitting the light in the ultraviolet region and a region of Aly1Ga1-y1-y2Iny2N(0<
y1<
1, 0<
y2<
1, y1<
y2) emitting the light in the visible region.
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Abstract
According to the invention, a Group III nitride compound semiconductor light-emitting element is provided with a light-emitting layer comprising two layers of different in ratio of AlGaInN composition, and emitting light with an emission peak wavelength in an ultraviolet region and light with an emission peak wavelength in a visible region. The light-emitting element and a fluorescent material excited by light in the ultraviolet region are combined to configure a light emitting device.
113 Citations
10 Claims
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1. A light emitting device, comprising:
-
a light-emitting element comprising a Group III nitride compound semiconductor and including a light-emitting layer emitting light with an emission peak wavelength in an ultraviolet region and light with an emission peak wavelength in a visible region; and
a fluorescent material excited by said light in the ultraviolet region to emit light with a wavelength different from that of said excitation light, wherein the light-emitting layer includes a region of Alx1Ga1-x1-x2Inx2N(0<
x1<
1, 0<
x2<
1, x1>
x2) emitting the light in the ultraviolet region and a region of Aly1Ga1-y1-y2Iny2N(0<
y1<
1, 0<
y2<
1, y1<
y2) emitting the light in the visible region. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light emitting device, comprising:
-
a light-emitting element comprising a Group III nitride compound semiconductor and including a light-emitting layer emitting light with an emission peak wavelength in an ultraviolet region and light with an emission peak wavelength in a visible region; and
a fluorescent material excited by said light in the ultraviolet region to emit light with a wavelength different from that of said excitation light, wherein the light-emitting layer includes a region of AlxGa1-xN(0≦
x≦
1) emitting the light in the ultraviolet region and a region of InyGa1-yN (0y≦
1) emitting the light in the visible region. - View Dependent Claims (8)
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9. A light emitting device, comprising:
-
a light-emitting element comprising a Group III nitride compound semiconductor and including a light-emitting layer emitting light with an emission peak wavelength in an ultraviolet region and light with an emission peak wavelength in a visible region; and
a fluorescent material excited by said light in the ultraviolet region to emit light with a wavelength different from that of said excitation light, wherein the light emitting direction is shielded by a light transmitting material dispersed with the fluorescent material. - View Dependent Claims (10)
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Specification