Substrate for mounting a light-emitting element and circuit board for mounting a light-emitting element that includes it, and light-emitting element module

Patent metadata

Field	Value
Publication number	US-11769864-B2
Application number	US-201816636537-A
Country	US
Kind code	B2
Filing date	Sep 26, 2018
Priority date	Sep 28, 2017
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A substrate for mounting a light-emitting element according to the present disclosure contains a crystal particle of aluminum oxide and is composed of an alumina-based ceramic that contains 97% by mass or more of Al as a value of an Al2O3 equivalent among 100% by mass of all components thereof. An average value of an equivalent circle diameter of the crystal particle is 1.1 μm or greater and 1.8 μm or less and a standard deviation of an equivalent circle diameter thereof is 0.6 μm or greater and 1.4 μm or less.

First claim

The invention claimed is:

1. A substrate for mounting a light-emitting element-that contains a crystal particle of aluminum oxide and is composed of an alumina-based ceramic that contains 97% by mass or more of Al as a value of an Al 2 O 3 equivalent among 100% by mass of all components thereof, wherein an average value of an equivalent circle diameter of the crystal particle is 1.1 μm or greater and 1.8 μm or less and a standard deviation of an equivalent circle diameter thereof is 0.6 μm or greater and 1.4 μm or less, wherein a number of a crystal particle with an equivalent circle diameter that is 2 μm or greater and an aspect ratio that is 2 or greater is 10 or more and 25 or less, within a range of a surface area of 1344 μm 2 on a surface thereof.

2. The substrate for mounting a light-emitting element according to claim 1 , wherein a ratio of B/A is 0.6 or greater and 0.8 or less where A is an average value of an equivalent circle diameter of the crystal particle and B is a standard deviation of an equivalent circle diameter of the crystal particle.

3. The substrate for mounting a light-emitting element according to claim 1 , wherein a crystal particle with an equivalent circle diameter that is 0.8 μm or less is at 25% or more and 40% or less among 100% of a total number of the crystal particle.

4. The substrate for mounting a light-emitting element according to claim 1 , wherein a skewness of a distribution curve of an equivalent circle diameter of the crystal particle is greater than 0.

5. The substrate for mounting a light-emitting element according to claim 1 , having a plurality of pores, wherein a porosity thereof is 4% by surface area or greater and 7% by surface area or less and an average value of distances between centroids of the plurality of pores is 3 μm or greater and 9 μm or less.

6. A circuit board for mounting a light-emitting element, comprising a base that is provided as a piece from the substrate for mounting a light-emitting element according to claim 1 and a metal layer that is located on the base.

7. A light-emitting element module, comprising the circuit board for mounting a light-emitting element according to claim 6 and a light-emitting element that is located on the metal layer.

Assignees

• Kyocera Corp

Inventors

• Matsushita Kouji

Classifications

• H10H20/0364

  of interconnections · CPC title

• H10H20/856

  Reflecting means · CPC title

• H10H20/857 Primary

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• H10H20/8581

  characterised by their material · CPC title

• H01L33/62 Primary

  Electricity · mapped topic