Package method and package

• US 10,090,445 B2
• Filed: 06/19/2017
• Issued: 10/02/2018
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Genesis Photonics Inc.
• Inventors: Hung, Chin-Hua, Lee, Hao-Chung, Lin, Yu-Feng
• Primary Examiner(s): Ho, Anthony
• Assistant Examiner(s): Quinto, Kevin
• Application Number:
  US15/627,430
• Publication Number:
  US 20170288100A1
• Time in Patent Office: 470 Days
• Field of Search: None
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/52 Encapsulations

Abstract

A package method includes steps of providing a light emitting module, a mold and a molding compound, wherein the light emitting module includes a substrate and at least one light emitting unit disposed on the substrate, the mold has at least one recess, and a side wall of the recess is parallel to a side surface of the light emitting unit; filling the recess with the molding compound; placing the substrate on the mold reversely, so that the light emitting unit is immersed into the recess and the molding compound directly encapsulates the light emitting unit; and heating and pressing the substrate and the mold, so as to solidify the molding compound.

Claims

1. A package comprising:

a substrate;

a light emitting unit disposed on the substrate, the light emitting unit having a main light emitting surface; and

a molding compound disposed on the substrate and directly encapsulating the light emitting unit, the molding compound comprising a plurality of first phosphor particles and a plurality of second phosphor particles, an emission wavelength of the first phosphor particles being smaller than an emission wavelength of the second phosphor particles, the first phosphor particles in the molding compound having a first concentration per unit volume, the second phosphor particles in the molding compound having a second concentration per unit volume, the first concentration per unit volume being larger than the second concentration per unit volume at a position away from the main light emitting surface, the first concentration per unit volume being smaller than the second concentration per unit volume at a position close to the main light emitting surface, wherein a distance between the main light emitting surface and an upper surface of the molding compound is smaller than a distance between a first side surface of the light emitting unit and a second side surface of the molding compound.

2. The package of claim 1, wherein the light emitting unit is a blue light emitting diode, the emission wavelength of the first phosphor particles is between 490 nm and 570 nm, and the emission wavelength of the second phosphor particles is between 620 nm and 750 nm.

3. The package of claim 1, wherein the molding compound has an upper surface, the main light emitting surface is parallel to the upper surface, and a distance between the main light emitting surface and the upper surface is between 90 μ

m and 200 μ

m.

4. The package of claim 1, wherein a first side surface of the light emitting unit is substantially parallel to a second side surface of the molding compound.

5. A package comprising:

at least one light emitting unit having a main light emitting surface; and

a molding compound directly encapsulating the light emitting unit, wherein the molding compound has a plurality of first phosphor particles and a plurality of second phosphor particles, and an emission wavelength of the first phosphor particles is smaller than an emission wavelength of the second phosphor particles, wherein the first phosphor particles in the molding compound has a first concentration per unit volume, and the first concentration per unit volume at a first position away from the main light emitting surface is larger than the first concentration per unit volume at a second position that is closer to the main light emitting surface than the first position, wherein a concentration per unit volume of the second phosphor particles increases gradually in a direction away from the main light emitting surface.

6. The package of claim 5, wherein the light emitting unit is a blue light emitting diode, the first phosphor particles is green phosphor, and the second phosphor particles is red phosphor.

7. The package of claim 5, wherein the molding compound has an upper surface, the main light emitting surface is parallel to the upper surface, and a distance between the main light emitting surface and the upper surface is between 90 μ

m and 200 μ

m.

8. The package of claim 5, wherein a first side surface of the light emitting unit is substantially parallel to a second side surface of the molding compound.

9. The package of claim 5, wherein a distance between the main light emitting surface and an upper surface of the molding compound is smaller than a distance between a first side surface of the light emitting unit and a second side surface of the molding compound.

10. A package comprising:

at least one light emitting unit having a main light emitting surface; and

a molding compound directly encapsulating the light emitting unit, wherein the molding compound has a plurality of first phosphor particles and a plurality of second phosphor particles, and an emission wavelength of the first phosphor particles is smaller than an emission wavelength of the second phosphor particles, wherein the first phosphor particles in the molding compound has a first concentration per unit volume, and the first concentration per unit volume at a first position away from the main light emitting surface is larger than the first concentration per unit volume at a second position that is closer to the main light emitting surface than the first position, wherein a distance between the main light emitting surface and an upper surface of the molding compound is smaller than a distance between a first side surface of the light emitting unit and a second side surface of the molding compound.

11. The package of claim 10, wherein the light emitting unit is a blue light emitting diode, the first phosphor particles is green phosphor, and the second phosphor particles is red phosphor.

12. The package of claim 10, wherein the molding compound has an upper surface, the main light emitting surface is parallel to the upper surface, and a distance between the main light emitting surface and the upper surface is between 90 μ

m and 200 μ

m.

13. The package of claim 10, wherein a first side surface of the light emitting unit is substantially parallel to a second side surface of the molding compound.