# Patent

## Title
Semiconductor light-emitting device and method of fabricating the same

## Abstract

The invention provides a semiconductor light-emitting device package structure. The semiconductor light-emitting device package structure includes a substrate, N sub-mounts, and N semiconductor light-emitting die modules, wherein N is a positive integer lager than or equal to 1. Each of the sub-mounts is embedded on the substrate and exposed partially. Each of the semiconductor light-emitting die modules is mounted on the exposed surface of one of the sub-mounts.

## Background
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of co-pending U.S. utility application entitled “Semiconductor Light-Emitting Device and Method of Fabricating the Same” having Ser. No. 11/921,176, filed Nov. 28, 2007 which claims priority to the PCT application entitled “Semiconductor Light-Emitting Device and Method of Fabricating the Same”, having Ser. no. PCT/CN2006/001165, filed May 31, 2006, which also claims priority to Chinese application entitled “Semiconductor Light-Emitting Device and Method of Fabricating the Same”, having Ser. no. 200510074731.1, filed May 31, 2005, each of which is incorporated by reference herein in its entirety.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a semiconductor light-emitting device package structure, and more particularly, to a multi-chip module single package structure for semiconductor light-emitting dies.
2. Description of the Prior Art
Because of the advantages of long life span, light weight, low power consumption, and absence of mercury, semiconductor light-emitting devices, such as light-emitting diode (LED), has become an ideal light source, and it has been greatly developed. LED can be applied in many fields, including information, communication, consumer electronics, vehicles, traffic light, billboard, and illumination market.
However, current high power semiconductor light emitting devices face a problem of overheating after continued lighting for a period. Furthermore, current semiconductor light-emitting device package structures generally face the problem of exceeding heat resistance, which affects the power and efficiency of lighting. Therefore, conventional semiconductor light emitting device package structures can not reduce the temperature of the light emitting device by simply providing a heat sink. Accordingly, there is a need to provide a package structure with high heat dissipating efficiency to solve the problem of exceeding heat resistance between the interface of the package structure and the heat dissipating module.
SUMMARY OF THE INVENTION
Accordingly, a scope of the invention is to provide a semiconductor light-emitting device package structure for semiconductor light-emitting dies to solve the problem of the prior art.
In a preferred embodiment, a semiconductor light-emitting device package structure of the invention includes a substrate, a flat sub-mount, at least one semiconductor light-emitting die module, and a package material. The substrate thereon defines a top surface and a bottom surface, and a first recess is formed on the top surface, and a second recess is formed on the bottom surface. The second recess is passed through and linked together with the first recess. Furthermore, a protrusion is formed on the top surface along the edge of the first recess, and a plurality of outer electrodes are disposed on the top surface. The flat sub-mount is linked to the second recess and thereon defines a respective first surface and a respective second surface. The flat sub-mount is embedded in the second recess such that the first surface of the sub-mount is partially exposed within the first recess. Each of the at least one semiconductor light-emitting die includes a bottom portion and a inter electrode, the at least one semiconductor light-emitting die is mounted to the first surface of the sub-mount partially exposed within the first recess. Additionally, the package material is filled into the protrusion to cover the at least one semiconductor light-emitting die.
The scope of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment, which is illustrated in the various figures and drawings.



BRIEF DESCRIPTION OF THE APPENDED DRAWINGS
FIG. 1 is a top view of a semiconductor light-emitting device package structure of an embodiment of the invention.
FIG. 2 is a sectional view of a semiconductor light-emitting device package structure of an embodiment of the invention.
FIG. 3 is a sectional view of a semiconductor light-emitting device package structure of an embodiment of the invention.
FIG. 4 is a sectional view of a semiconductor light-emitting device package structure of an embodiment of the invention.



DETAILED DESCRIPTION OF THE INVENTION
The present invention is to provide a semiconductor light-emitting device package structure for semiconductor light-emitting dies. The preferred embodiments are disclosed as below.
Please refer to FIG. 1, which shows a top view of a semiconductor light-emitting device package structure of an embodiment of the invention. In the embodiment, the semiconductor light-emitting device package structure 1 includes a substrate 11, a sub-mount 12, and at least one semiconductor light-emitting die 13. The substrate has a top surface 111, and a plurality of outer electrodes 17 are disposed on the top surface 111. Furthermore, the sub-mount 12 has a first surface 121, and the at least one semiconductor light-emitting die 13 is mounted to the first surface 121 of the sub-mount 12 via the inter electrode of its bottom surface 131.
Please refer to FIG. 2, which shows a sectional view of a semiconductor light-emitting device package structure of an embodiment of the invention. The semiconductor light-emitting device package structure 1 includes a substrate 11, a sub-mount 12, at least one semiconductor light-emitting die 13, and a package material 14. The top surface 111 of the substrate 11 has a first recess 1111, and a bottom surface 112 is defined on the substrate 11. Furthermore, a second recess 1121 is formed on the bottom surface 112 which is passed through and linked together with the first recess 1111. The sub-mount 12 is embedded in the second recess 1121, and a second surface 122 is defined on the sub-mount 12, and the first surface 121 of the sub-mount 12 is exposed in the first recess 1111, and a protrusion 16 is formed on the top surface 111 along the edge of the first recess 1111. The at least one semiconductor light-emitting die 13 has a bottom 131 which mounted to the first surface 121 of the sub-mount 12 partially exposed within the first recess 1111. The package material 14 is filled into the protrusion 16 to cover the at least one semiconductor light-emitting die 13. Moreover, the at least one semiconductor light-emitting die 13 has inner electrodes which electrically coupled to the outer electrodes 17 on the top surface 111 via wires. In the embodiment, the inner electrodes of the at least one semiconductor light-emitting die 13 is connected to the outer electrodes 17 in series. However, the connection of the electrodes can be parallel connection to reach the goal of the invention.
A heat conductive paste 15 is disposed between the first surface 121 of the sub-mount 12 and the bottom of the first recess 1111 to combine the first substrate 11 and the sub-mount 12.
Please refer to FIG. 3, which shows a sectional view of a semiconductor light-emitting device package structure of an embodiment of the invention. As shown in FIG. 3, the second surface 122 of the flat sub-mount 12 is parallel to the bottom surface 112 of the substrate 11. Furthermore, the heat conductive paste 15 is coated under the second surface 122 of the flat sub-mount 12, so as to allow the second surface 122 of the sub-mount 12 and the bottom surface 112 of the substrate 11 to constitute into a plane.
Please refer to FIG. 4, which shows a sectional view of a semiconductor light-emitting device package structure of an embodiment of the invention. As shown in FIG. 4, the second surface 122 of the flat sub-mount 12 is parallel to the bottom surface 112 of the substrate 11. Furthermore, an heat conductive paste 15 is coated under the bottom surface 112 of the substrate 11, so as to allow the second surface 122 of the sub-mount 12 and the bottom surface 112 of the substrate 11 to constitute into a plane.
Obviously, the invention provides a package structure with high heat dissipating efficiency, and the package structure is used to package at least a semiconductor light-emitting device. Furthermore, the package structure of the invention can also be used to coordinate with a heat conducting device to further eliminate the heat generated by a high power semiconductor light emitting device, so as to solve the problem of exceeding heat resistance between the interface of the package structure and the heat dissipating module.
With the example and explanations above, the features and spirits of the invention will be hopefully well described. Those skilled in the art will readily observe that numerous modifications and alterations of the device may be made while retaining the teaching of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

## Claims

1. A semiconductor light-emitting device package structure, comprising:
a substrate with a top surface, a bottom surface, a plurality of outer electrodes and a shoulder, a first recess being formed on the top surface and a second recess being formed on the bottom surface, the second recess being linked together with the first recess, the plurality of outer electrodes being disposed on the top surface, and the shoulder is formed between the first recess and the second recess;
a sub-mount with a respective first surface and a respective second surface, the sub-mount being accommodated by the second recess of the substrate, the shoulder of the substrate defining a lower surface which faces toward the first surface of the sub-mount, an adhesive between the first surface of the flat sub-mount and the shoulder of the substrate, and the second surface of the sub-mount being parallel to the bottom surface to the substrate;
a plurality of semiconductor light-emitting dies, each of the semiconductor light-emitting dies with a bottom portion and an inter electrode, the bottom portion of each semiconductor light-emitting die being mounted on the first surface of the sub-mount such that each semiconductor light-emitting die is exposed within the first recess, wherein the inter electrodes of the plurality of semiconductor light-emitting dies and the plurality of outer electrodes of the substrate are electrically connected in series; and
a package material covering the plurality of semiconductor light-emitting dies.

2. The semiconductor light-emitting device package structure of claim 1, wherein no electrical connection through the adhesive between the first surface of the flat sub-mount and the shoulder of the substrate.

3. The semiconductor light-emitting device package structure of claim 1, wherein the substrate is constituted by a metal material, a ceramic material, a flexible circuit board, or a hard circuit board.

4. The semiconductor light-emitting device package structure of claim 1, wherein the sub-mount is a silicon sub-mount.

5. The semiconductor light-emitting device package structure of claim 1, the second surface of the sub-mount and the bottom surface to the substrate are substantially coplanar.