This disclosure discloses a method of manufacturing a light-emitting device, comprising proving a single growth substrate having a first major surface and a second major surface; forming a plurality of light-emitting stacks on the first major surface, wherein the light-emitting stacks are electrically connected to each other in series via a first electrical connecting structure; forming an electronic device on the second major surface; and forming a second electrical connecting structure extending from the first major surface to the second major surface and electrically connecting the first light-emitting stacks and the electronic device, wherein the electronic device comprises a resistance, an inductance, capacitance, or a rectifying device, and wherein the material of the resistance comprises tantalum nitride (TaN), silicon-chromium alloy (SiCr), or nickel-chromium alloy (NiCr).

TECHNICAL FIELD

The application relates to a light-emitting device, and more particularly to a light-emitting device comprising a substrate having a first major surface and a second major surface. A plurality of light-emitting stacks are on the first major surface, and at least one electronic device is on the second major surface, wherein the light-emitting stacks are electrically connected to the electronic device.

REFERENCE TO RELATED APPLICATION

The application claims the right of priority based on TW application Ser. No. 098123043 filed on Jul. 7, 2009, which is incorporated herein by reference and assigned to the assignee herein.

DESCRIPTION OF BACKGROUND ART

The light-emitting mechanism of the light-emitting diode is to take advantage of the energy difference of electrons between the n-type semiconductor and the p-type semiconductor and then to release the energy in the form of light, which is different from the light-emitting mechanism of the incandescent lamp, which is by heating. Therefore, the light-emitting diode is called the cold light source. Besides, the light-emitting diode has the advantages such as long endurance, long lifetime, light weight, and low power consumption. Therefore, the present illumination market expects the light-emitting diode as a new generation illumination to substitute for the traditional light source and apply it to various fields such as traffic signal, backlight module, street light, and medical apparatus.

FIG. 1is the illustration of a conventional AC light-emitting diode device. As shown inFIG. 1, the light-emitting device100comprises a substrate10, a plurality of light-emitting units12disposing on the substrate10and are serially connected to form circuit A and circuit B that are anti-parallel connected to each other later, and two electrodes14and16disposing on the substrate10and electrically connecting to the plurality of the light-emitting units12. When the alternative current flows into the light-emitting device100through the electrode14, the current passes through circuit A and triggers the light-emitting unit12in the circuit A to emit light. Correspondingly, when the alternative current flows into the light-emitting device100through the electrode16, the current passes through circuit B and triggers the light-emitting unit12in the circuit B to emit light.

Besides, the light-emitting device100could form a photoelectric apparatus by further connecting with other components.FIG. 2is the illustration for the conventional photoelectric apparatus. As shown inFIG. 2, a photoelectric apparatus200comprises a sub-mount20, which comprises at least one circuit202; a solder22located on the sub-mount20to attach the light-emitting device100on the sub-mount20and to electrically connect the substrate10of the light-emitting device100with the circuit202on the sub-mount20; and one electrically connecting structure24electrically connecting the electrode16of the light-emitting device100and the circuit202on the sub-mount20. The sub-mount20comprises a lead frame or a large-size mounting substrate to facilitate the circuit arrangement and to raise the heat dissipating efficiency.

Nevertheless, although the design of the light-emitting device100could be applied to the alternative current directly, only parts of the light-emitting units12emitting light at the same time often causes the waste of the light-emitting area on the light-emitting device.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a method of manufacturing a light-emitting device, comprising providing a single growth substrate having a first major surface and a second major surface; forming a plurality of first light-emitting stacks on the first major surface, wherein the first light-emitting stacks are electrically connected to each other via a first electrical connecting structure; forming an electronic device on the second major surface; and forming a second electrical connecting structure extending from the first major surface to the second major surface and electrically connecting the first light-emitting stacks and the electronic device, wherein the electronic device comprises a resistance, an inductance, capacitance, or a rectifying device, and wherein the material of the resistance comprises tantalum nitride (TaN), silicon-chromium alloy (SiCr), or nickel-chromium alloy (NiCr).

The present disclosure also provides a method of manufacturing a light-emitting device, comprising providing a single growth substrate having a first major surface and a second major surface; forming a plurality of first light-emitting stacks on the first major surface; wherein the first light-emitting stacks are electrically connected to each other via a first electrical connecting structure; forming an electronic device on the second major surface; forming a second electrical connecting structure extending from the first major surface to the second major surface and electrically connecting the first light-emitting stacks and the electronic device; and forming a heat dissipation layer on the second major surface of the single growth substrate, wherein the heat dissipation layer comprises a thermal conductivity larger than 50 W/mK.

The present disclosure further provides a method of manufacturing a light-emitting device, comprising providing a single growth substrate having a first major surface and a second major surface; forming a plurality of light-emitting stacks on the first major surface; and forming a bridge rectifying device and a passive device on the second major surface, wherein the light-emitting stacks, the bridge rectifying device, and the passive device are electrically connected to each other.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The following shows the description of the embodiments of the present disclosure in accordance with the drawings.

FIG. 3Ais the side view illustration in accordance with one embodiment in the present disclosure andFIG. 3Bis the circuit illustration in accordance with one embodiment of the present disclosure. As shown inFIGS. 3A and 3B, the light-emitting device comprises a substrate30having a first major surface302and a second major surface304; a plurality of light-emitting stacks32spacing at intervals mutually on the first major surface302, wherein the light-emitting stacks32electrically connecting to each other via a plurality of the first electrical connecting structures320; and at least one rectifying device34locating on the second major surface304of the substrate30, wherein the rectifying device34having a plurality of semiconductor stacks340, which are electrically connecting to each other via a second electrical connecting structure342and arranging in a bridge circuit form. Besides, the light-emitting stacks32electrically connect to the rectifying device34by the first electrical connecting structure36.

Besides, the light-emitting device300further comprises at least one bump pad38, which is electrically connecting to the rectifying device34and the AC power supplier (not shown in the figure) respectively, located on the second major surface304. When the alternative current flows into the light-emitting device300via the bump pad38, the current is converted into a direct current by passing through the bridge rectifying circuit, which is arranged by the plurality of the semiconductor stacks340located on the second major surface304, and then the current is transmitted to the light-emitting stacks through the third electrical connecting structure36, wherein the third electrical connecting structure36comprises the metal plug filled in the via hole passing through the substrate30, or the conductive wire extending from the first major surface302to the second major surface304.

In the light-emitting device300, the materials of the substrate30comprise the insulating materials such as sapphire, aluminum nitride (MN), glass, or diamond. The substrate30can also be a single layer structure formed by a single material. The substrate30in the embodiment is a single layer substrate made of sapphire. The light-emitting stacks32comprise one first conducting type semiconductor layer322formed on the substrate30, a light emitting layer324formed on the first conducting type semiconductor layer322, and a second conducting type semiconductor layer326formed on the light emitting layer324, wherein the materials of the light-emitting stacks32comprise semiconductor materials containing aluminum (Al), gallium (Ga), indium (In), nitrogen (N), phosphor (P), and/or arsenic (As), such as the Gallium Nitride (GaN) series materials or the Aluminum Gallium Indium Phosphide (AlGaInP) series materials. In the embodiment, the light-emitting stacks32are formed by the metal-organic chemical vapor deposition, and each light-emitting stack32comprises a partially exposed first conducting type semiconductor layer322formed by photolithography and the etching technology. The first electrical connecting structure320serially connects to the first conducting type semiconductor layer322of the light emitting stack32and the second conducting type semiconductor layer326of the adjacent light emitting stack32respectively.

Furthermore, the semiconductor stacks340for composing the rectifying device34comprise a plurality of the structures such as the light-emitting diode, the Zener diode, or the Schottky diode formed by the metal-organic chemical vapor deposition, the photolithography and the etching technology, and the materials comprise the III-V compounds or the Group IV elements such as the Gallium Nitride (GaN) series materials, the Aluminum Gallium Indium Phosphide (AlGaInP) series materials, or Silicon.

As shown inFIG. 4A, the first electrical connecting structure320comprises an insulating layer3202filled between the adjacent light-emitting stacks32to prevent the short circuit between the adjacent light-emitting stacks32and a metal layer3204that is located on the insulating layer3202and electrically connecting to the adjacent light-emitting stacks32. Besides, the first electrical connecting structure320could also be a metal wire as shown inFIG. 4B, and the two terminals of the metal wire are connected to the adjacent light-emitting stacks32respectively. The second electrical connecting structure342comprises an insulating layer3422filled between the adjacent semiconductor stacks340to prevent the short circuit between the connecting semiconductor stacks340and a metal layer3424that is located on the insulating layer3422and electrically connecting to the adjacent semiconductor stacks340. Besides, the second electrical connecting structure342can also be a metal wire as shown inFIG. 5B, and the two terminals of the metal wire are connected to the adjacent semiconductor stacks340respectively.

FIG. 6is the illustration of another embodiment. The light-emitting stacks32and the semiconductor stacks340of the light-emitting device300can be formed on the first major surface302and the second major surface304by the metal-organic chemical vapor deposition, the photolithography and the etching technology. Besides, an adhesive layer44can also be provided between the light-emitting stacks32, the semiconductor stacks340and the substrate30to attach the light-emitting stacks32and the semiconductor stacks340to the first major surface302and the second major surface306of the substrate30respectively. The yield of the products is therefore increased and the production cost is reduced. The material of the adhesive layer44comprises the metal material or the organic adhesive material.

FIG. 7is the illustration of another embodiment. As shown inFIG. 7, the light-emitting device300further comprises a passive device40located on the second surface304of the substrate30and electrically connecting to the rectifying device34. For example, the passive device40comprises a resistance, an inductance, or a capacitance serially connecting to the rectifying device34, or a capacitance parallelly connecting to the rectifying device34to provide the electric protection for the light-emitting device300or to adjust the electric characteristic of the light-emitting device300. The passive device can be a thin-film resistance, a thin-film capacitance, or a thin-film inductance integrated with the light-emitting device300as a single chip, and the material of the above mentioned thin-film resistance comprises tantalum nitride (TaN), silicon-chromium alloy (SiCr), or nickel-chromium alloy (NiCr).

FIG. 8is the illustration of another embodiment. As shown inFIG. 8, the light-emitting device300further comprises a wavelength converting structure42located on the light-emitting stacks32to absorb and convert the light emitted from the light-emitting stacks32. Wherein, the material of the wavelength comprises one or more than one fluorescent materials or phosphor materials, and the wavelength converting structure42can be a layer structure uniformly coated on the light-emitting stacks32or a glue comprising the fluorescent material to encapsulate the light-emitting stacks so the products with different optical properties are formed.

FIG. 9is the illustration of another embodiment. As shown inFIG. 9, the light-emitting device300further comprises a heat dissipation layer46, wherein the heat dissipation layer46can connect with the second major surface304of the substrate30or the passive device34to guide the heat produced from the elements in the light-emitting device300. Besides, the material of heat dissipation layer46has high thermal conductivity which is preferably larger than that of the substrate30or larger than 50 W/mK. The material of the heat dissipation layer46can be copper, silver, gold, nickel, diamond, diamond-like carbon (DLC), aluminum nitride (AlN), graphite, carbon nanotube (CNT), or the composite thereof. The thickness of the heat dissipation layer is preferably larger than 3 μm and the area of it is preferably not smaller than 30% of that of the substrate30.

Furthermore, the light-emitting devices300as shown inFIG. 3AtoFIG. 9can be applied to the lighting system, and the lighting system can be further applied to the illumination system, the display backlight module, or the vehicle lighting, and the light-emitting devices300can be adapted to the power supply with 100V, 110V, 220V, 240V, 12V, 24V, or 48V.

The present disclosure discloses the light-emitting device300disposing the device such as the rectifying device34, the bump pad38, the resistance, the inductance, the capacitance, and the heat dissipation layer46that are not for light emitting on the second major surface304of the substrate30and to dispose the light-emitting stacks32on the first major surface302of the substrate30. Such design uses the total surface where the light-emitting stacks32located on the light-emitting device300to be the light extraction surface and reduces the waste of light-emitting area.

The embodiments mentioned above are used to describe the technical thinking and the characteristic of the invention and to make the person with ordinary skill in the art to realize the content of the invention and to practice, which could not be used to limit the claim scope of the present invention. That is, any modification or variation according to the spirit of the present invention should also be covered in the claim scope of the present disclosure.