Light-emitting diode package structure
A light-emitting diode package structure is provided. The light-emitting diode package comprises an insulating sub-mount, a first patterned conductive-reflective film, a second patterned conductive-reflective film and a light-emitting diode chip. The insulating sub-mount has a first surface and a cavity therein. The first and the second patterned conductive-reflective film are set over a portion of the first surface, a portion of the sidewalls of the cavity and a portion of the bottom surface of the cavity. The light-emitting diode chip is set up inside the cavity of the insulating sub-mount. The light-emitting diode has a pair of electrodes. The electrodes are electrically connected to the first and the second patterned conductive-reflective film respectively. Since the light-emitting diode structure of this invention incorporates the patterned conductive-reflective films, efficiency of the light-emitting diode is increased.
1. A light-emitting diode package structure, comprising:
a semiconductor sub-mount having a first surface with a cavity therein and comprising a first conductive type semiconductor substrate and a second conductive type region enclosed by the first conductive type semiconductor substrate;
a first patterned conductive-reflective film set up on a portion of the first surface, a first sidewall of the cavity and a bottom surface of the cavity, wherein the first patterned conductive-reflective film contacts with the first sidewall of the cavity and a part of the first conductive type semiconductor substrate;
a second patterned conductive-reflective film set up on a portion of the first surface, a second sidewall of the cavity and a bottom surface of the cavity, wherein the second patterned conductive-reflective film covers the second sidewall of the cavity;
an insulating layer only set up in-between the semiconductor sub-mount and the second patterned conductive-reflective film; and
a light-emitting diode chip set up inside the cavity of the semiconductor sub-mount, wherein the light-emitting diode has a first electrode and a second electrode electrically connected to the first patterned conductive-reflective film and the second patterned conductive-reflective film.
2. The light-emitting diode package structure of claim 1 , wherein the package further comprises a pair of bumps set up between the first electrode of the light-emitting diode and the first patterned conductive-reflective film as well as the second electrode of the light-emitting diode and the second patterned conductive-reflective film.
3. The light-emitting diode package structure of claim 2 , wherein material constituting the bumps comprises lead-tin, gold-tin alloy or gold.
4. The light-emitting diode package structure of claim 1 , wherein the package further comprises a first bonding pad and a second bonding pad set up on the first patterned conductive-reflective film and the second patterned conductive-reflective film for connecting electrically with an external circuit board.
5. The light-emitting diode package structure of claim 1 , wherein the sidewall and the bottom surface of the cavity form an obtuse angle.
6. The light-emitting diode package structure of claim 1 , wherein material constituting the semiconductor sub-mount comprises silicon, gallium arsenide, SiC, or zinc oxide.
7. The light-emitting diode package structure of claim 6 , wherein the first conductive type semiconductor substrate is an N-doped material layer and the second conductive type region is a P-doped material layer.
8. The light-emitting diode package structure of claim 6 , wherein the first conductive type semiconductor substrate is a P-doped material layer and the second conductive type region is an N-doped material layer.