TWM496850U - LED package structure - Google Patents

Description

Light emitting diode package structure

The present invention relates to a package structure, and more particularly to a light emitting diode package structure.

Light-emitting diodes have the advantages of solid-state lighting, high power, and power saving. Therefore, more and more lighting devices currently use light-emitting diodes as light sources. In the known light-emitting diode package, the color rendering index is often improved by adding red phosphor powder. Referring to FIG. 1 , an illuminable package provided in the patent application No. I435479 includes a carrier 11 having a recess 111, a luminescent wafer 12 disposed on the carrier 11, and a carrier. a stopper 13 having a first phosphor powder 14 on a bottom surface 112, a first encapsulant 15 formed on the carrier 11 to cover the luminescent wafer 12 and the stopper 13, and a first encapsulant 15 formed thereon The second encapsulant 16 on the first encapsulant 15 and having the second phosphor powder 17. The carrier 11 has a reflective surface 113 surrounding the periphery of the recess 111. The first phosphor 14 is red or orange, and the second phosphor 17 is yellow or green. By blending the first phosphor 14 , the light emitted by the first phosphor 14 is matched with the light emitted from the light-emitting chip 12 and the second phosphor 17 to improve color rendering.

However, since the stopper 13 containing the first phosphor 14 is located only on the bottom surface 112 of the carrier 11 and does not abut the reflective surface 113 surrounded by the four sides, the periphery of the stopper 13 is not supported. In addition, the stopper 13 has a certain height protruding upward from the upright, and the structure of the stopper 13 is relatively fragile, is relatively easy to be damaged, and is cumbersome to manufacture. When the stopper 13 is damaged or broken, the effect of the first fluorescent powder 14 on the excitation light is affected, so that the color rendering property is lowered.

Therefore, the object of the present invention is to provide a light-emitting diode package structure which is structurally innovative, can maintain luminance and enhance color rendering.

Therefore, the novel LED package structure comprises: a base including a bearing surface, a light-emitting unit disposed on the bearing surface and capable of emitting a first color light, and a red powder disposed along the bearing surface a layer of glue, and a layer of phosphor glue. The phosphor layer covers the light emitting unit and is excited by the first color light to emit a second color light. The layer of red powder can be excited by at least one of the first color light and the second color light to emit red light.

The utility model has the advantages that the red powder adhesive layer is covered on the bearing surface, and the red powder adhesive layer is flaky and can be supported by the bearing surface, so the red powder adhesive layer has stable structure and good strength. The red powder layer can absorb at least one of the first color light and the second color light in an all-round manner, thereby emitting red light, which can improve the color rendering of the light, and the novel can maintain the advantages of high brightness and high light extraction efficiency.

2‧‧‧Base

21‧‧‧ bearing surface

3‧‧‧Lighting unit

30‧‧‧External electrode

301‧‧‧ wire

31‧‧‧Lighting body

32‧‧‧ electrodes

4‧‧‧Red powder layer

5‧‧‧Fluorescent rubber layer

51‧‧‧First Department

52‧‧‧Second floor

53‧‧‧ Third Floor

54‧‧‧Fourth Department

6‧‧‧Package colloid

7‧‧‧reflective layer

8‧‧‧Insulation

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic cross-sectional view of a known illuminable package; FIG. 2 is a novel light-emitting diode of the present invention. FIG. 3 is a cross-sectional view showing a second embodiment of the present invention; FIG. 3 is a cross-sectional view showing a second embodiment of the novel LED package structure; FIG. 4 is a third embodiment of the novel LED package structure. A cross-sectional view of an embodiment; and FIG. 5 is a cross-sectional view of a fourth embodiment of the novel light emitting diode package structure.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, a first embodiment of the novel LED package structure includes a base 2, a light emitting unit 3, a red powder layer 4, a phosphor layer 5, and an encapsulant 6.

The base 2 can be made of a ceramic material and has good heat dissipation properties. The base 2 includes a horizontal and upwardly facing bearing surface 21.

The light emitting unit 3 is disposed on the carrying surface 21 and can emit a first color light. The light emitting unit 3 of this embodiment is a blue light emitting diode, and the first color light is blue light. The illuminating unit 3 includes a illuminating body 31, and two electrodes 32 at the bottom of the illuminating body 31. The electrodes 32 is respectively in contact with two external electrodes 30 disposed on the susceptor 2, so that the illuminating unit 3 can be connected to an external circuit via the external electrodes 30. The light emitting unit 3 of the present embodiment is a package using a flip chip LED. The flip-chip LED is on the package, and since the flip-chip directly contacts the lower heat-dissipating substrate, the heat dissipation is good, the life of the LED chip can be prolonged, and the current can be used. Moreover, since it is free from wire during packaging, it can avoid the risk of wire breakage, and it also has the advantage of facilitating small-sized design.

The red powder layer 4 is disposed on the bearing surface 21 along the bearing surface 21 , and the red powder layer 4 is located between the bearing surface 21 and the encapsulant 6 , and is also located on the bearing surface 21 and the light emitting unit. 3 rooms. The red powder layer 4 is actually formed by mixing red luminescent powder in a permeable colloid, such as silicone or epoxy.

The phosphor layer 5 covers the light-emitting unit 3 and is excited by the first color light to emit a second color light, the second color light being different from the first color light. The phosphor layer 5 includes a first layer portion 51 covering the light emitting unit 3, a second layer portion 52 extending downward from the periphery of the first layer portion 51 and surrounding the light emitting unit 3, and a The third layer portion 53 between the electrodes 32 of the light-emitting unit 3. The phosphor layer 5 is actually formed by mixing a phosphor powder in a permeable colloid, such as silicone or epoxy. The phosphor powder of the phosphor layer 5 of the present embodiment is a yellow phosphor powder, and the second color light is yellow light.

The encapsulant 6 is disposed on the red powder layer 4 and the phosphor layer 5, and covers the phosphor layer 5 and the light emitting unit 3. The encapsulant 6 is made of a light transmissive material such as silicone or epoxy.

When the embodiment is used, the first color light (for example, blue light) emitted by the light emitting unit 3 can excite the fluorescent glue layer 5 to emit the second color light (for example, yellow light), and the fluorescent glue layer 5 covers the light. The light-emitting unit 3 causes the light-emitting unit 3 to absorb light from the phosphor layer 5 to excite the second color light regardless of whether the light is emitted upward or toward the side, thereby achieving a good excited light effect. The red powder layer 4 can be excited by at least one of the first color light and the second color light to emit red light, that is, the red powder layer 4 emits red light, which may be part of absorbing the light emitting unit 3. The first color light emitted downward is excited light, or the second color light is absorbed by the second color light, and the second color light absorbed by the red powder layer 4 is mainly from the first layer of the phosphor layer 5 The second floor portion 52. The first color light and the second color light of the embodiment can be mixed to form white light, and the red light transmitted through the red powder layer 4 is mixed with the white light to improve the color rendering of the light. Finally, the light will be emitted upward through the encapsulant 6. Since the red powder layer 4 is covered with a large area along the bearing surface 21 of the susceptor 2, it has a wide absorption range and thus has a good excitation light effect. Moreover, the red powder layer 4 can be formed on the bearing surface 21 by coating, and the process is simple and easy to carry out.

In summary, the red powder adhesive layer 4 is extended on the bearing surface 21, and can be completed only by a simple coating process, which has the advantages of being easy to manufacture, and the red powder adhesive layer 4 is a sheet-like structure. The whole body is supported by the bearing surface 21, so the layer structure is stable and the strength is good. The red powder layer 4 can absorb at least one of the first color light and the second color light in an all-round manner, thereby emitting red light, which can enhance the color rendering of the light, and the novel can maintain the advantages of high brightness and high light extraction efficiency.

Referring to FIG. 3, the second embodiment of the present invention is substantially the same as the first embodiment. The difference is that the embodiment further includes a bearing surface 21 disposed on the base 2 and the A reflective layer 7 between the red powder layers 4. The reflective layer 7 extends along the bearing surface 21 to extend. The reflective layer 7 can be made of a material having good light reflection, such as a metal, a metal oxide or a white glue, and the reflective layer 7 can be formed by stacking a single layer or a plurality of layers. The reflective layer 7 is used to reflect the light emitted by the light-emitting unit 3 in the light-emitting direction. In the present embodiment, the light is reflected upward, thereby improving the light utilization efficiency.

Referring to FIG. 4, the third embodiment of the novel LED package structure is substantially the same as the second embodiment. The difference is that the phosphor layer 5 of the embodiment has a wider extension range, and the phosphor paste is wider. The layer 5 is further coated on the red powder layer 4, and the phosphor layer 5 further includes a fourth layer portion 54 connected to the bottom periphery of the second layer portion 52 and located on the top surface of the red powder layer 4. The second layer portion 54 is directly coated on the red powder layer 4, so that the second color light emitted by the fourth layer portion 54 can be directly absorbed by the red powder layer 4, so that the red powder layer 4 is excited. The light effect is good, and it can emit red light, which is beneficial to improve the color rendering of light.

Referring to FIG. 5 , the fourth embodiment of the novel LED package structure is substantially the same as the first embodiment. The difference is that the susceptor 2 of the embodiment is made of a metal material and the pedestal 2 is above. There is an insulating layer 8. Moreover, the present embodiment includes an external electrode 30 located above the susceptor 2, and the external electrode 30 can be actually divided into two parts, respectively contacting the electrode 32 of the illuminating unit 3, and the two parts are respectively connected with a wire 301. To connect external circuits. The insulating layer 8 is disposed between the susceptor 2 and the external electrode 30.

However, the above description is only for the embodiments of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent changes and modifications made by the present patent application scope and the contents of the patent specification are still It is within the scope of this new patent.

2‧‧‧Base

21‧‧‧ bearing surface

3‧‧‧Lighting unit

30‧‧‧External electrode

31‧‧‧Lighting body

32‧‧‧ electrodes

4‧‧‧Red powder layer

5‧‧‧Fluorescent rubber layer

51‧‧‧First Department

52‧‧‧Second floor

53‧‧‧ Third Floor

6‧‧‧Package colloid

Claims (10)

A light emitting diode package structure comprising: a base comprising a bearing surface; a light emitting unit disposed on the bearing surface and capable of emitting a first color light; a red powder layer disposed along the bearing surface And a phosphor layer covering the light emitting unit and being excited by the first color light to emit a second color light; the red powder adhesive layer being capable of receiving at least one of the first color light and the second color light Excite and emit red light. The light emitting diode package structure of claim 1, further comprising a reflective layer disposed between the red powder layer and the bearing surface. The light emitting diode package structure according to claim 2, wherein the reflective layer is made of metal, metal oxide or white glue. The light emitting diode package structure according to claim 2, wherein the reflective layer is formed by stacking more than one layer. The light emitting diode package structure of claim 2, wherein the phosphor layer is further coated on the red powder layer. The light emitting diode package structure according to claim 1, wherein the base material is a ceramic material. The light emitting diode package structure of claim 1, wherein the base material is made of a metal material, and an insulating layer is disposed above the base. The LED package structure of claim 7, further comprising an external electrode above the pedestal, wherein the insulating layer is disposed on the pedestal Between the external electrodes. The light emitting diode package structure of claim 1, wherein the first color light is blue light. The light emitting diode package structure of claim 1, further comprising an encapsulant disposed on the carrying surface and covering the light emitting unit.