CN203510494U

CN203510494U - Multi-tooth cutter for machining LED surface strengthening light-emitting structure

Info

Publication number: CN203510494U
Application number: CN201320352730.9U
Authority: CN
Inventors: 夏宏荣; 袁冬; 汤勇; 万珍平; 陆龙生; 袁伟; 李宗涛
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2013-06-19
Filing date: 2013-06-19
Publication date: 2014-04-02
Anticipated expiration: 2023-06-19

Abstract

The utility model discloses a multi-tooth cutter for machining an LED surface strengthening light-emitting structure. The multi-tooth cutter comprises a cutter body and a plurality of cutter teeth which are arranged at the front end of the cutter body and are formed by machining focus plasma beams. The cutter teeth have the same front angle, the back angle and the cutting angle, wherein the front angle gamma ranges from 0 degree to -60 degrees, the back angle alpha ranges from 0 degree to +15 degrees, and the cutting angle theta ranges from 30 degrees to 150 degrees. The width of the cutter teeth is larger than or equal to the width of the LED surface strengthening light-emitting structure and the height of the cutter teeth is larger than or equal to the height of the LED surface strengthening light-emitting structure. The multi-tooth cutter has very high machining precision and machining efficiency, a part of light can be prevented from being absorbed by a chip due to full-reflection through the layer of surface micro-structure, the light emitted from the chip can be refracted to the outer surface of the chip most rapidly as much as possible, and therefore the light-emitting efficiency of the light-emitting diode chip can be improved.

Description

A kind of multitooth tool of processing LED surface peening light emitting structures

Technical field

The utility model relates to the technical field of cutting tool, particularly a kind of multitooth tool of processing LED surface peening light emitting structures.

Background technology

In the face of the severe energy, environmental pressure, the construction of accelerating resource-conserving and friendly environment society has become the strategic choice of national economy and social development.LED(Light Emitting Diode) having energy-saving and environmental protection, long-life three advantages, is the new generation of green light source after incandescent lamp, fluorescent lamp.According to statistics, at present electric consumption on lighting accounts for 19% of global total electricity consumption, utilizes existing LED efficient illumination solution at least can save 40% energy consumption, can discharge less every year 5.55 hundred million tons of carbon dioxide.China classifies " energy-efficient, long-life semiconductor lighting product " as " major fields and preferential theme thereof " in < < national science and technical development medium-term and long-term plans outline > >, and the application in city illumination, urban look, traffic lighting and resident's illuminating engineering is promoted as the energy-conservation special project of great science and technology using LED light source technology, be listed as " 12 " strategic new industry.

The luminous efficiency of LED chip depends on the product of internal quantum efficiency and external quantum efficiency (being light extraction efficiency).Along with the development of growth technology and multi-quantum pit structure, the internal quantum efficiency of LED chip has approached 100%.Yet, because the refractive index of epitaxial material is much larger than air refraction, makes light that active area produces because total internal reflection can not effectively be launched from LED, thereby cause the external quantum efficiency of LED very low.As for current widely used GaN base LED, the refractive index of GaN is 2.5, and critical angle is 23.6 °, the photon energy that only has sub-fraction light to only have incidence angle the to be less than 23.6 ° LED that escapes out, all the other photons are finally absorbed by LED in chip internal generation total reflection, thereby it is inner at LED chip to be converted into heat accumulation, existing large quantity research shows, along with the rising of LED chip junction temperature, light decay, look drift, the series of problems such as hot polymerization collection will occur, and even can cause the final inefficacy of light source device.Therefore the light extraction efficiency that, how to improve power LED chip is the key issue that LED must solve for general lighting.

Utility model content

The purpose of this utility model is that the shortcoming that overcomes prior art, with not enough, provides a kind of multitooth tool of the LED of processing surface peening light emitting structures.

In order to achieve the above object, the utility model is by the following technical solutions:

A kind of multitooth tool of processing LED surface peening light emitting structures of the utility model, comprise that cutter body and a plurality of uses that are arranged on cutter body front end focus on the cutter tooth that beam-plasmas process, and each cutter tooth has identical anterior angle, relief angle and cutting angle: wherein, anterior angle γ is 0 °～-60 °, relief angle α is 0 °～+ 15 °, cutting angle θ is 30 °～150 °, the facewidth of described cutter tooth is more than or equal to the width of LED surface peening light emitting structures, and the tooth depth of described cutter tooth is more than or equal to the height of LED surface peening light emitting structures.

Preferably, the multitooth tool material of described processing LED surface peening light emitting structures be sapphire, diamond one of them.

Preferably, the point of a knife of described cutter tooth is circular arc, and arc radius is 0.1～1 μ m

The utility model has following advantage and effect with respect to prior art:

(1) multitooth tool of processing LED surface peening light emitting structures of the present utility model carries out the processing method of secondary staggered cutting moulding to LED surface, can process at short notice LED surface peening bright dipping cone structure, and working (machining) efficiency is very high.

(2) compare with traditional LED strengthening bright dipping equipment needed thereby, adopt process tool processing of the present utility model LED surface only to need surface only to need high-accuracy mechanical system of processing, expense relatively reduces and is simple, convenient, cost savings.

Accompanying drawing explanation

Fig. 1 is the utility model embodiment flip chip type LED schematic diagram;

Fig. 2 is the schematic diagram of multitooth tool for the utility model embodiment micro-cutting;

Fig. 3 is the side schematic view of multitooth tool in Fig. 2;

Fig. 4 is the front schematic view of multitooth tool in Fig. 2;

Fig. 5 is the utility model embodiment multitooth tool cutting LED surface process schematic diagram;

Fig. 6 is that the utility model embodiment processes the schematic diagram after surface peening bright dipping micro-structural;

Fig. 7 is the schematic diagram of the utility model embodiment light emitting diode.

The specific embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.

Embodiment

The multitooth tool of a kind of LED of processing surface peening light emitting structures that the utility model provides, at utmost reduces chip surface to reflection of light, improves the light extraction efficiency of device.

Refer to shown in Fig. 1 to Fig. 7, the utility model is a kind of preparation method of multitooth tool of the LED of processing surface peening light emitting structures, and the manufacture method of the light-emitting diode of embodiment comprises:

Step 1: as shown in Figure 1, get a flip LED chips of having peeled off translate substrate; Described substrate be copper, silicon, carborundum, aluminium, gold-tin alloy, aluminium nitride one of them;

Step 2: utilize multitooth tool to form micro-groove at N-shaped semiconductor layer surface micro-cutting; Described micro-cutting processing and forming cutter material be sapphire, diamond one of them, corner radius is 0.1～1 μ m, cutting angle is 60～120 °, as shown in Figure 2;

Step 3: as shown in Figure 5, LED chip is rotated to an angle, utilize multitooth tool again to cut in N-shaped semiconductor layer surface, form taper strengthening bright dipping micro-structural; Described cutter staggered cutting path angle can be 30 °, 60 °, 90 ° or other any angles, this anglec of rotation can freely be selected according to actual situation, as shown in Figure 6, the height of described taper strengthening bright dipping micro-structural is 0.5～3 μ m, and the distance of adjacent taper strengthening bright dipping micro-structural is 1～5 μ m.

Below in conjunction with drawings and Examples, the concrete course of work is further described:

Embodiment: shown in Fig. 1-Fig. 7.Get a flip chip type LED chip of having peeled off translate substrate, be respectively from bottom to up substrate 1, p-type semiconductor layer 2, active layer 3 and N-shaped semiconductor layer 4, wherein said substrate 1 is copper substrate; Described p-type semiconductor layer 2 is p-type GaN material, and thickness is 150nm; Described active layer 3 is In0.1Ga0.9N/GaN multi-quantum pit structure, and thickness is 60nm; N-shaped semiconductor layer 4 is N-shaped GaN epitaxial layer, and thickness is 3000nm; Then utilize micro-cutting with multitooth tool 8(as shown in Figure 2) at the surperficial staggered cutting of N-shaped semiconductor layer 4, form taper strengthening bright dipping micro-structural 7, described cutter material is diamond, the wide 5mm of cutter, high 5mm, long 15mm, each tooth angle degree of cutter is 60 °; Described taper strengthening bright dipping micro-structural 7 is highly 0.5 μ m, and girth is 5 μ m; Then remake electrode 5,6, p-type GaN and p-type Ohm contact electrode 5 is electrically connected, N-shaped GaN and N-shaped Ohm contact electrode 6 are electrically connected, in order to forward voltage to be provided, final acquisition has LED that taper strengthens bright dipping micro-structural 7 as shown in Figure 7.

As shown in Figure 2, a kind of multitooth tool of processing LED surface peening light emitting structures in the present embodiment, include a plurality of uses and focus on the cutter tooth 9 that beam-plasma processes, and each cutter tooth has identical anterior angle, relief angle and cutting angle: as shown in Figure 3 and Figure 4, wherein, anterior angle γ is 0 °～-60 °, and relief angle α is 0 °～+ 15 °, and cutting angle θ is 30 °～150 °.

In order better to make LED surface peening light emitting structures, the facewidth of described cutter tooth is more than or equal to the width of LED surface peening light emitting structures, and the tooth depth of described cutter tooth is more than or equal to the height of LED surface peening light emitting structures.

For multitooth tool structure durable and cutting is met the requirements, described LED surface peening light emitting structures micro-cutting cutter material be sapphire, diamond one of them.

After above-mentioned multitooth tool cutting, the height of described strengthening bright dipping micro-structural is 0.5～3 μ m, and the distance of adjacent taper strengthening bright dipping micro-structural is 1～5 μ m.

Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.

Claims

1. a multitooth tool of processing LED surface peening light emitting structures, it is characterized in that, comprise that cutter body and a plurality of uses that are arranged on cutter body front end focus on the cutter tooth that beam-plasmas process, and each cutter tooth has identical anterior angle, relief angle and cutting angle: wherein, anterior angle γ is 0 °～-60 °, relief angle α is 0 °～+ 15 °, cutting angle θ is 30 °～150 °, the facewidth of described cutter tooth is more than or equal to the width of LED surface peening light emitting structures, and the tooth depth of described cutter tooth is more than or equal to the height of LED surface peening light emitting structures.

2. a kind of multitooth tool of processing LED surface peening light emitting structures according to claim 1, is characterized in that, the multitooth tool material of described processing LED surface peening light emitting structures be sapphire, diamond one of them.

3. a kind of multitooth tool of processing LED surface peening light emitting structures according to claim 1, is characterized in that, the point of a knife of described cutter tooth is circular arc, and arc radius is 0.1～1 μ m.