Wavelength-converting casting composition and white light-emitting semiconductor component
DC CAFCFirst Claim
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1. A wavelength-converting casting composition, comprising:
- a transparent epoxy casting resin;
an inorganic luminous substance pigment powder dispersed in said transparent casting resin, said pigment powder comprising luminous substance pigments selected from the group consisting of garnets doped with rare earths;
thiogallates doped with rare earths;
aluminates doped with rare earths; and
orthosilicates doped with rare earths; and
said luminous substance pigments having grain sizes ≦
20 μ
m and a mean grain diameter d50 ≦
5 μ
m.
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Abstract
The wavelength-converting casting composition is based on a transparent epoxy casting resin with a luminous substance admixed. The composition is used in an electroluminescent component having a body that emits ultraviolet, blue or green light. An inorganic luminous substance pigment powder with luminous substance pigments is dispersed in the transparent epoxy casting resin. The luminous substance is a powder of garnets, thiogallates, aluminates, or orthosilicates doped with rare earths, and preferably Ce-doped phosphors. The luminous substance pigments have particle sizes ≦20 μm and a mean grain diameter d50≦5 μM.
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Citations
21 Claims
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1. A wavelength-converting casting composition, comprising:
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a transparent epoxy casting resin;
an inorganic luminous substance pigment powder dispersed in said transparent casting resin, said pigment powder comprising luminous substance pigments selected from the group consisting of garnets doped with rare earths;
thiogallates doped with rare earths;
aluminates doped with rare earths; and
orthosilicates doped with rare earths; and
said luminous substance pigments having grain sizes ≦
20 μ
m and a mean grain diameter d50 ≦
5 μ
m.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
a) epoxy casting resin ≧
60% by weight;
b) luminous substance pigments >
0 and ≦
25% by weight;
c) thixotropic agent >
0 and ≦
10% by weight;
d) mineral diffusor >
0 and ≦
10% by weight;
e) processing adjuvant >
0 and ≦
3% by weight;
f) hydrophobic agent >
0 and ≦
3% by weight; and
g) adhesion promoters >
0 and ≦
2% by weight.
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6. The casting composition according to claim 1, wherein said luminous substance pigments are Ce-doped garnets.
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7. The casting composition according to claim 1, wherein said luminous substance pigments are YAG:
- Ce based particles.
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8. The casting composition according to claim 1, which comprises a content of iron ≦
- 20 ppm.
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9. The casting composition according to claim 1, wherein said luminous pigment are formed with a silicone coating.
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10. The casting composition according to claim 1, wherein said luminous substances pigment powder converts a wavelenght of ultraviolet, blue, or green light into a relatively longer wavelenght.
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11. The casting composition according to claim 1, which comprises light-scattering particles added to said casting resin.
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12. A light emitting semiconductor component, comprising;
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a semiconductor body formed of a semiconductor layer sequence and being capable, during an operation of the semiconductor component, of emitting electromagnetic radiation in a first spectral range selected from ultraviolet, blue, and green;
wavelength-converting casting composition disposed in a vicinity of said semiconductor body and formed of a transparent epoxy casting resin in an inorganic luminous substance pigment powder dispersed in said transparent casting resin;
said pigment powder comprising luminous substance pigments selected from the group consisting of garnets dopes with rare earths;
thiogallates doped with rare earths;
aluminates doped with rare earths; and
orthosilicates doped with rare earths; and
said luminous substance pigments having grain sizes ≦
20 μ
m and a mean grain diameter d50≦
5 μ
m and converting a portion of the radiation originating from said semiconductor component into radiation of a higher wavelength, such that the semiconductor component emits mixed radiation including the higher-wavelength radiation and radiation from the first spectral range.- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification