Semiconductor light emitting device provided with an alkaline earth metal boric halide phosphor for luminescence conversion
First Claim
1. A light emitting device comprising a semiconductor light emitting element and a phosphor which converts a part of a luminescence spectrum emitted from the semiconductor light emitting element;
- wherein said luminescence spectrum of said semiconductor light emitting element is located between a near ultraviolet region and a short-wavelength visible region,wherein said phosphor is made by adding a red luminescent activator to a base material of a blue luminescent phosphor,wherein said phosphor is represented by a general formula of (M1−
x−
yEuxM′
y)2B5O9M″
,where M is at least one selected from the group consisting of Mg, Ca, Ba, Sr, M′
is at least one selected from the group consisting of Mn, Fe, Cr, Sn, 0.0001≦
x≦
0.5, 0.0001≦
y≦
0.5, and M″
is at least one halogen selected from the group consisting of F, Cl, Br, I.
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Accused Products
Abstract
A light emitting device is provided that has a semiconductor light emitting element and a phosphor which converts a part of the luminescence spectrum emitted from the semiconductor light emitting element. The luminescence spectrum of the semiconductor light emitting element is located between a near ultraviolet region and a short-wavelength visible region, and the phosphor is made by adding a red luminescent activator to a base material of a blue luminescent phosphor. Thereby, improving the color shading generated by the dispersion of the spectra of the light emitting elements and obtaining the light emitting device having a high brightness and a good color rendering properties. With the light emitting device, it is possible to provide the light sources for the lighting apparatus of medical treatments, the flash plate of a copying machine, etc., in which a good color rendering property is required.
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Citations
5 Claims
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1. A light emitting device comprising a semiconductor light emitting element and a phosphor which converts a part of a luminescence spectrum emitted from the semiconductor light emitting element;
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wherein said luminescence spectrum of said semiconductor light emitting element is located between a near ultraviolet region and a short-wavelength visible region, wherein said phosphor is made by adding a red luminescent activator to a base material of a blue luminescent phosphor, wherein said phosphor is represented by a general formula of (M1−
x−
yEuxM′
y)2B5O9M″
,where M is at least one selected from the group consisting of Mg, Ca, Ba, Sr, M′
is at least one selected from the group consisting of Mn, Fe, Cr, Sn, 0.0001≦
x≦
0.5, 0.0001≦
y≦
0.5, and M″
is at least one halogen selected from the group consisting of F, Cl, Br, I.
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2. The light emitting device according to claim 1;
wherein the emission wavelength can be adjusted by the added ratio of said red luminescent activator.
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3. The light emitting device according to claims 1;
wherein said semiconductor light emitting element has a main peak wavelength more than 360 nm in the ultraviolet region.
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4. A light emitting device comprising a semiconductor light emitting element and a phosphor which converts a part of a luminescence spectrum emitted from the semiconductor light emitting element;
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wherein said luminescence spectrum of said semiconductor light emitting element is located between a near ultraviolet region and a short-wavelength visible region, wherein said phosphor is made by adding a red luminescent activator to a base material of a blue luminescent phosphor, wherein said phosphor is an alkaline earth metal boric halide phosphor activated by at least Mn and Eu.
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5. A light emitting device comprising;
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a semiconductor light emitting element of which luminescence spectrum is located between a near ultraviolet region and a short-wavelength visible region, a first phosphor which converts a part of a luminescence spectrum emitted from the semiconductor light emitting element, said first phosphor being made by adding an activator for red light emission to a base material of a blue emitting phosphor, a second phosphor which can convert a part of the light emitted from the first phosphor to a light having a wavelength in a range from blue region to red region, wherein a mixed light of the light emitted from the first phosphor and the light emitted from the second phosphor is outputted, said mixed light having a wavelength within a range of white region, wherein said first phosphor is represented by a general formula of (M1−
x−
yEuxM′
y)2B5O9M″
,where M is at least one selected from the group consisting of Mg, Ca, Ba, Sr, M′
is at least one selected from the group consisting of Mn, Fe, Cr, Sn, 0.0001≦
x≦
0.5, 0.0001≦
y≦
0.5, and M″
is at least one halogen selected from the group consisting of F, Cl, Br, I.
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Specification