Method of producing a wavelength-converting casting composition

• US 7,235,189 B2
• Filed: 12/06/2000
• Issued: 06/26/2007
• Est. Priority Date: 09/20/1996
• Status: Expired due to Fees

• Current Assignee: OSRAM GmbH (Ams-Osram AG)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Schlotter, Peter, Schmidt, Ralf, Hohn, Klaus, Debray, Alexandra, Schneider, Ju
• Primary Examiner(s): Koslow; C. Melissa
• Application Number:
  US09/731,406
• Publication Number:
  US 20010045647A1
• Time in Patent Office: 2,393 Days
• Field of Search: 252/301.36, 252/301.4 R
• US Class Current: 252/301.36
• CPC Class Codes: C09K 11/7718 with alkaline earth metals
• CPC Class Codes: C09K 11/7746 with alkaline earth metals
• CPC Class Codes: C09K 11/7767 Chalcogenides
• CPC Class Codes: C09K 11/7769 Oxides C09K11/7768 takes precedence
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/48472 the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 24/73 Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/502 : Wavelength conversion materials
• CPC Class Codes: H01L 33/56 : Materials, e.g. epoxy or silicone resin
• CPC Class Codes: Y02B 20/00 : Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

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 phosphorous group of the general formula A₃B₅X₁₂:M, and the luminous substance pigments have particle sizes ≦20 μm and a mean grain diameter d₅₀≦5 μm.

Claims

1. A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body, the wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m, the method which comprises;

providing a base of transparent epoxy casting resin;

providing the luminous substance pigments from a phosphorus group having the general formula A₃B₅X₁₂;

M, where A is at least one element selected from the group consisting of Y, Gd, Lu, Sc. and La;

B is at least one element selected from the group consisting of Al and Ga;

X is oxygen; and

M is at least one element selected from the group consisting of Ce, Eu, Cr, Nd, Er, and Tb; and

mixing the luminous substance pigments with the base.

2. The method according to claim 1, which comprises, prior to the mixing step, slurrying the luminous substance pigments in a high-boiling alcohol and subsequently drying the luminous substance pigments.

3. The method according to claim 1, which comprises, prior to the mixing step, adding hydrophobic silicone wax to the luminous substance pigments.

4. The method according to claim 1, which comprises surface-modifying the luminous substance pigments at elevated temperatures with alcohols, glycol ethers and silicones.

14. The method according to claim 1, wherein the mean grain diameter d₅₀ of the luminous substance pigments is between one and two micrometers.

15. The method according to claim 1, which comprises adding light-scattering particles to the casting composition.

16. The method according to claim 1, wherein the casting composition comprises a content of iron ≦

20 ppm.

17. The method according to claim 1, which further comprises, prior to the mixing step, tempering the luminous substance pigments at a temperature of ≧

200°

C.

5. A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body, the wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m, the method which comprises;

providing a base of transparent epoxy casting resin;

providing the luminous substance pigments selected from the group consisting of Ce-doped phosphors;

garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates doped with rare earths; and

orthosilicates doped with rare earths;

mixing the luminous substance pigments with the base; and

prior to the mixing step, adding hydrophobic silicone wax to the luminous substance pigments.

6. A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body, the wavelength-converting casting containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m, the method comprising;

providing a base of transparent epoxy casting resin;

providing the luminous substance pigments selected from the group consisting of Ce-doped phosphors;

garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates doped with rare earths; and

orthosilicates doped with rare earths;

mixing the luminous substance pigments with the base; and

surface-modifying the luminous substance pigments at elevated temperatures with alcohols, glycol ethers and silicones.

7. A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body component, the wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m, the method comprising;

providing a base of transparent epoxy casting resin;

providing the luminous substance pigments selected from the group consisting of Ce-doped phosphors;

garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates doped with rare earths; and

orthosilicates doped with rare earths; and

mixing the luminous substance pigments with the base,

wherein the mean grain diameter d₅₀ of the luminous substance pigments is between one and two micrometers.

8. A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body, the wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m, the method comprising;

providing a base of transparent epoxy casting resin;

providing the luminous substance pigments selected from the group consisting of Ce-doped phosphors;

garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates doped with rare earths; and

orthosilicates doped with rare earths;

mixing the luminous substance pigments with the base; and

adding light-scattering particles to the casting composition.

9. A method of producing a wavelength-converting casting composition for application on an ultraviolet, blue or green light emitting body, the wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m, the method comprising;

providing a base of transparent epoxy casting resin;

providing the luminous substance pigments selected from the group consisting of Ce-doped phosphors;

garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates doped with rare earths; and

orthosilicates doped with rare earths; and

mixing the luminous substance pigments with the base,

wherein the casting composition comprises a content of iron ≦

20 ppm.

10. A method of producing a wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m for a white light emitting semiconductor component having an electroluminescing semiconductor body emitting blue light, the method comprising;

providing a base of transparent epoxy casting resin,

providing the luminous substance pigments selected from the group consisting of garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates dopes with rare earths; and

orthosilicates doped with rare earths;

which pigments shift some of the blue light emitted by the semiconductor body into the green and red spectral range;

mixing the luminous substance pigments with the base; and

prior to the mixing step, slurrying the luminous substance pigments in a high-boiling alcohol and subsequently drying the luminous substance pigments.

11. A method of producing a wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m for a white light emitting semiconductor component having an electroluminescing semiconductor body emitting blue light, the method comprising;

providing a base of transparent epoxy casting resin,

providing the luminous substance pigments selected from the group consisting of garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates dopes with rare earths; and

orthosilicates doped with rare earths;

which pigments shift some of the blue light emitted by the semiconductor body into the green and red spectral range;

mixing the luminous substance pigments with the base; and

surface-modifying the luminous substance pigments at elevated temperatures with alcohols, glycol ethers and silicones.

12. A method of producing a wavelength-converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m for a white light emitting semiconductor component having an electroluminescing semiconductor body emitting blue light, the method comprising;

providing a base of transparent epoxy casting resin,

providing the luminous substance pigments selected from the group consisting of garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates dopes with rare earths; and

orthosilicates doped with rare earths;

which pigments shift some of the blue light emitted by the semiconductor body into the green and red spectral range;

mixing the luminous substance pigments with the base; and

prior to the mixing step, adding hydrophobic silicone wax to the luminous substance pigments.

13. A method of producing a wavelength converting casting composition containing luminous substance pigments having grain sizes ≦

20 μ

m and a mean grain diameter d₅₀≦

5 μ

m for a white light emitting semiconductor component having an electroluminescing semiconductor body emitting blue light, the method comprising;

providing a base of transparent epoxy casting resin,

providing the luminous substance pigments selected from the group consisting of garnets doped with rare earths;

thiogallates doped with rare earths;

aluminates dopes with rare earths; and

orthosilicates doped with rare earths;

which pigments shift some of the blue light emitted by the semiconductor body into the green and red spectral range; and

mixing the luminous substance pigments with the base; and

wherein the casting composition comprises a content of iron ≦

20 ppm.