Method for producing a light-emitting diode and light-emitting diode

Patent metadata

Field	Value
Publication number	US-9318667-B2
Application number	US-201214240481-A
Country	US
Kind code	B2
Filing date	Jul 16, 2012
Priority date	Aug 29, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A method of producing a light-emitting diode includes providing at least one light-emitting diode chip, providing a suspension comprising a solvent and particles of at least one luminescent material, arranging the at least one light-emitting diode chip in the suspension, electrophoretically depositing the particles on an outer face of the at least one light-emitting diode chip, and completing the light-emitting diode.

First claim

The invention claimed is:

1. A method of producing a light-emitting diode comprising:
providing at least one light-emitting diode chip,
applying an electrically conductive protective material to parts of an outer face of each light-emitting diode chip,
providing a suspension comprising a solvent and particles of at least one luminescent material,
arranging the at least one light-emitting diode chip in the suspension,
electrophoretically depositing the particles on an outer face of the at least one light-emitting diode chip,
fixing the particles on the outer face after depositing the particles,
removing the particles in places from the outer face after fixing the particles,
removing the electrically conductive protective material after the electrophoretic deposition, and
completing the light-emitting diode.

2. The method according to claim 1 , wherein a plurality of light-emitting diode chips are arranged jointly in the suspension.

3. The method according to claim 2 , wherein the light-emitting diode chips are in the form of an assembly during electrophoretic deposition and are singulated into individual light-emitting diode chips after electrophoretic deposition.

4. The method according to claim 1 , wherein each light emitting diode chip is arranged in a package.

5. The method according to claim 4 , wherein the particles are deposited electrophoretically in places on an outer face of the package.

6. The method according to claim 4 , wherein the electrically conductive protective material is applied to parts of the outer face of each light-emitting diode chip and of the package, which protective material is removed after the electrophoretic deposition.

7. The method according to claim 1 , further comprising, after removal of the electrically conductive protective material, and before completion of the light-emitting diode:
providing a further suspension comprising a solvent and particles of at least one further luminescent material,
arranging the at least one light-emitting diode chip at least in part in the further suspension, and
electrophoretically depositing the particles of the at least one further luminescent material on an outer face of the at least one light-emitting diode chip.

8. Method according to claim 7 , wherein the particles of the at least one luminescent material and the particles of the at least one further luminescent material on the outer face of the at least one light-emitting diode chip form a pattern of first regions with particles of a first luminescent material and second regions with particles of a second luminescent material.

9. The method according to claim 8 , wherein the pattern forms at least one photonic crystal.

10. The method according to claim 1 , wherein the electrically conductive protective material is applied to an electrical connection point on an outer face of each light-emitting diode chip before the electrophoretic deposition and after the electrophoretic deposition the particles deposited on the electrically conductive protective material are removed by partial removal of the electrically conductive protective material.

11. A method of producing a light-emitting diode comprising:
providing at least one light-emitting diode chip, wherein each light emitting diode chip is arranged in a package,
applying an electrically conductive protective material to parts of an outer face of the package,
providing a suspension comprising a solvent and particles of at least one luminescent material,
arranging the at least one light-emitting diode chip in the suspension,
electrophoretically depositing the particles on an outer face of the at least one light-emitting diode chip,
fixing the particles on the outer face after depositing the particles,
removing the particles in places from the outer face after fixing the particles,
removing the conductive protective material after the electrophoretic deposition, and
completing the light-emitting diode.

Assignees

• Stoll Ion
• Gallmeier Hans-Christoph
• Petersen Kirstin
• Osram Opto Semiconductors Gmbh

Inventors

• Stoll Ion
• Gallmeier Hans-Christoph
• Petersen Kirstin

Classifications

• H10H20/0361

  of wavelength conversion means · CPC title

• H10H20/8516

  having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer or wavelength conversion layer with a concentration gradient · CPC title

• H10H20/8513 Primary

  having two or more wavelength conversion materials · CPC title

• H10H20/8512 Primary

  Wavelength conversion materials · CPC title

• H01L33/502 Primary

  Electricity · mapped topic