Converter material, method for producing a converter material, and optoelectronic component

• US 10,297,727 B2
• Filed: 11/04/2013
• Issued: 05/21/2019
• Est. Priority Date: 11/07/2012
• Status: Active Grant

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Stoll, Ion, Gootz, Britta
• Primary Examiner(s): Yasmeen, Nishath
• Application Number:
  US14/441,154
• Publication Number:
  US 20150255688A1
• Time in Patent Office: 2,024 Days
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/08 containing inorganic luminescent materials
• CPC Class Codes: C09K 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: H01L 2224/48091 Arched
• 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 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

A converter material includes a porous inorganic matrix material having a multiplicity of pores. A multiplicity of inorganic nanoparticles are applied on the surface of the matrix material. The nanoparticles are suitable for converting electromagnetic radiation in a first wavelength range into electromagnetic radiation in a second wavelength range. A method for producing such a converter material and an optoelectronic component that includes such a converter material are furthermore specified.

Claims

1. A converter material comprising:

a porous inorganic matrix material having a plurality of pores, each pore having an interior surface; and

a first plurality of inorganic nanoparticles in direct contact with the interior surface within each pore, wherein the first nanoparticles are spaced apart from each other on the interior surface within each pore, and wherein the first nanoparticles are suitable for converting electromagnetic radiation in a first wavelength range to electromagnetic radiation in a second wavelength range.

2. The converter material according to claim 1, wherein the pores have an average diameter of between 2 nanometers and 50 nanometers inclusive.

3. The converter material according to claim 1, wherein the first nanoparticles have a diameter of between 1 nanometer and 50 nanometers inclusive.

4. The converter material according to claim 1, further comprising a second plurality of nanoparticles in direct contact with the interior surface within each pore, and wherein the second nanoparticles are suitable for converting the electromagnetic radiation in the first wavelength range to electromagnetic radiation in a third wavelength range.

5. The converter material according to claim 1, wherein the converter material forms a plurality of converter particles.

6. The converter material according to claim 5, wherein the converter particles have a diameter of between 1 micrometer and 50 micrometers inclusive.

7. The converter material according to claim 5, wherein the converter particles have a diameter of between 20 nanometers and woo nanometers inclusive.

8. The converter material according to claim 1, wherein the converter material is shaped as a planar plate or as a domed plate.

9. The converter material according to claim 1, wherein the porous inorganic matrix material comprises an oxide of one of the following materials or of a mixture of the following materials:

silicon, aluminum, tantalum, titanium, zirconium, cerium, tin, or niobium.

10. The converter material according to claim 1, wherein the first nanoparticles comprise one of the following materials:

zinc sulfide, cadmium sulfide, zinc selenide, zinc oxide, cadmium selenide, cadmium oxide, indium phosphide, copper indium sulfide, or lead sulfide.

11. The converter material according to claim 1, wherein the first nanoparticles are core-shell nanoparticles.

12. The converter material according to claim 1, wherein the first nanoparticles are arranged only on the interior surface within each pore, while a volume region inside each pore is free of the first nanoparticles.

13. The converter material according to claim 1, wherein the converter material forms a plurality of converter particles;

and

wherein the first nanoparticles are arranged only on the interior surface within each pore, while a volume region inside each pore is free of the first nanoparticles.

17. The converter material according to claim 1, wherein the first nanoparticles are distributed randomly through the porous inorganic matrix material.

14. An optoelectronic component comprising:

a semiconductor body configured to emit electromagnetic radiation in a first wavelength range from a radiation exit surface during operation; and

a converter material adjacent to the radiation exit surface of the semiconductor body, wherein the converter material comprises a porous inorganic matrix material having a plurality of pores, wherein a plurality of inorganic nanoparticles are in direct contact with an interior surface within each pore, wherein the nanoparticles are spaced apart from each other on the interior surface within each pore, and wherein the nanoparticles are suitable for converting the electromagnetic radiation in the first wavelength range to electromagnetic radiation in a second wavelength range.

15. The optoelectronic component according to claim 14, wherein the converter material is present as converter particles in a potting.

16. A converter material comprising:

a porous inorganic matrix material having a plurality of pores; and

a plurality of inorganic nanoparticles suitable for converting electromagnetic radiation in a first wavelength range into electromagnetic radiation in a second wavelength range,

wherein the nanoparticles are located only on an interior surface within each pore, such that the nanoparticles are spaced apart from each other and in direct contact with the interior surface within the pore, while a volume region inside each pore is free of the nanoparticles,

wherein the matrix material has an open porosity of between 0.05 and 0.75, inclusive, and

wherein the nanoparticles have an outer shell comprising an organic material.