KR20070039728A - High efficiency led and led package of using uv epoxy, and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a high-efficiency light emitting diode, a package, and a manufacturing method thereof, comprising a light generating part formed of a semiconductor, a reflecting part, and a light extracting part forming a structure using a UV curable epoxy. Invention regarding a diode and forming a light generating part formed of a semiconductor layer, forming a reflecting plate, applying a UV curable epoxy, and forming a structure for light extraction, high efficiency light emitting diodes The invention relates to a manufacturing method.

And a light extracting portion for forming a structure using a package frame, a semiconductor light generating portion, and a UV curable epoxy to form a structure, and connecting the light emitting diode and the package frame to the inside of the package frame. The present invention relates to a method of manufacturing a high-efficiency light emitting diode package, comprising the steps of filling and curing a UV curable epoxy, applying a UV curable epoxy, and forming a structure for light extraction.

Such highly efficient light emitting diodes, packages, and manufacturing methods thereof are made of UV-curable epoxy, which enables easy mass production with low-cost equipment and simple processes, and easily realizes a new type of light extraction layer with excellent characteristics. Diodes and packages can be manufactured more easily.

Light Emitting Diode, Light Emitting Diode Package, Photo Extraction, UV Curing Epoxy, Pn Junction Diode

Description

High efficiency LED and LED package of using UV epoxy, and manufacturing method

1 is a view for explaining a conventional technology that improves the light extraction efficiency by forming irregularities on the surface during the growth of GaN LED,

2 is a view showing a light emitting diode having a conventional reverse pyramid type extraction structure;

3 is a view showing a light emitting diode in which a structure is formed on a surface by using a conventional photolithography method;

4 is a view showing a light emitting diode forming an extraction structure inside a conventional diode;

5 is a view showing a light emitting diode forming an extraction structure using a conventional dicing saw, etc.

6 is a view showing a structure of a general resin storage type light emitting diode package and a pattern from which light is emitted;

7 is a view showing the structure of a high-efficiency light emitting diode in which a structure is formed using a UV-curable epoxy as a first embodiment of the present invention;

8 is a view showing a structure of a high-efficiency light emitting diode in which a light extraction portion is formed of a UV curable epoxy powder mixed with a fluorescent material according to a second embodiment of the present invention;

9A to 9D illustrate a flow of a process of forming a structure using a UV curable epoxy as a first embodiment of the method of manufacturing a high efficiency light emitting diode of the present invention;

10A to 10E illustrate a flow of a process of forming a light extraction part from a UV curable epoxy mixed with a fluorescent material as a second embodiment of the method of manufacturing a high efficiency light emitting diode of the present invention;

11A is a view showing the structure of a package in which a structure is formed using a UV curable epoxy as a first embodiment of the high-efficiency light emitting diode package of the present invention;

11B is a view showing a structure in which a light extraction part is formed of a UV-curable epoxy mixed with a fluorescent material as a second embodiment of the high-efficiency LED package of the present invention;

12 is a view showing a structure in which a structure is formed by using a UV curable epoxy on both a light emitting diode inside a package and a resin surface outside the package as a third embodiment of the high-efficiency light emitting diode package of the present invention;

13A to 13D are views illustrating a flow of a process of forming a structure using a UV curable epoxy as a first embodiment of the method of manufacturing a high efficiency LED package of the present invention.

The present invention relates to a high-efficiency light emitting diode, a package, and a method of manufacturing the same. More particularly, in order to increase the extraction efficiency of light that is totally internally reflected and cannot escape from the inside, The present invention relates to a highly efficient light emitting diode, a package, and a method of manufacturing the same, which can be easily formed by using equipment and a simple process.

Light emitting diodes (LEDs) are semiconductor devices that move electrons from a high energy level to a low one when a current flows, and emits light of a specific wavelength. LEDs are used as light sources in a variety of applications, such as small green lights that flash when the hard disk spins on the computer body, large billboards on city buildings, and twinkling lights on cell phones.

This luminescence generated when a voltage is applied to a semiconductor is called electric luminescence (electroluminescence), and it is known from the observation of emission of silicon carbide crystals in 1923, and since 1923, high efficiency emission at gallium arsenide pn junction was discovered. The research was vigorously advanced to practical use in the late 1960s.

Suitable materials for the light emitting diode include ① the light emission wavelength in the visible or near-infrared region, ② high luminous efficiency, and ③ production of pn junctions. Gallium arsenide GaAs, gallium phosphide GaP, gallium-arsenic-phosphorus GaAs _1-x P _x , gallium-aluminum-arsenic Ga _{1 - x} Al _x As, indium phosphide InP, indium-gallium-phosphor ln _1-x Ga _{Although the} 2 element or 3 element compound semiconductor which is 3B and 5B groups, such as xP, is used, the research is also progressing about 2B, 6B group, 4A, and 4B group.

GaN is one of the hardest semiconductor materials that has a bandgap of 3.4 eV and is chemically very stable and does not contain environmentally harmful substances such as arsenic (As) and mercury (Hg). to be.

In addition, gallium nitride semiconductors have a strong electron affinity, which is excellent in optical properties as well as electron mobility, electron saturation speed and field breakdown voltage characteristics. It is a semiconductor material that has attracted much attention in electronic device applications.

In particular, it is known that gallium nitride semiconductor (GaN) can emit light in the blue and near-ultraviolet region, and blue LED and color conversion type white LED using the same have become a practical wavelength in the industry.

As a result of the development of gallium nitride semiconductor devices, high brightness light emitting diodes (LEDs) are realized in the entire visible light region, and high brightness white light emitting diodes (LEDs) for use as light sources have begun to be developed.

Combination of high-brightness RGB (Red Green Blue) light-emitting diodes (LEDs), single-chip light-emitting diodes (LEDs) through multi-layer structure or wafer fusion, and high-brightness blue light emission A combination of a diode (LED) and a yellow phosphor (Phosphor), a method of exciting a phosphor (Phosphor) using an ultraviolet light emitting diode (LED) (in a manner similar to a fluorescent lamp) has been developed, and various applications are expected.

The light emitting mechanism of LED is largely divided by (1) by recombination of free carrier and (2) by recombination at impurity emission center. The emission wavelength at (1) is approximately equal to ch / Eg (c is the luminous flux, h is Planck's constant, and Eg is the band width of the forbidden band). In the case of gallium arsenide, it becomes near infrared light of about 900 nm. In gallium arsenic phosphor, Eg increases with increasing phosphorus content, making it a visible light emitting diode.

On the other hand, in (2), the light emission wavelength varies depending on the type of impurities added to the semiconductor. In the case of gallium phosphide, light emission involving zinc and oxygen atoms is red (wavelength 700 nm), and light emission involving nitrogen atoms is green (wavelength 550 nm). The light emitting diode is smaller in size than the conventional light source, has a long lifetime, and has low power and good efficiency because electrical energy is directly converted into light energy.

Although there are various indicators indicating the performance of such LEDs, the luminous efficiency (%), the external quantum efficiency (%), etc. are important parameters indicating the performance of the LED.

Looking at the extraction efficiency (Extraction efficiency) which is a problem associated with the present invention, the extraction efficiency (%) is determined by the ratio of electrons injected into the LED and the photons emitted out of the LED, the higher the extraction efficiency means a brighter LED do. Extraction efficiency of LED is highly influenced by chip shape, surface shape, chip structure, and packaging type, so it requires careful attention when designing LED.

Due to the difference in refractive index between the materials constituting the light emitting diode, total reflection may occur at the interface of the materials. On the other hand, the light generated inside the light emitting diode is radiated in all directions, and light incident above the critical angle at the interface does not escape the light emitting diode. Therefore, a considerable amount of light generated inside the light emitting diode does not escape the light emitting diode.

Therefore, a light extraction layer is formed in the light emitting diode in order to efficiently exit the light generated inside the light emitting diode. The light extraction layer reduces the angle of incidence at the interface so that as much light can escape as possible.

In FIG. 1, when the GaN LED is grown, irregularities are formed on the surface to improve light extraction efficiency. As shown in the AFM image of FIG. 1 (a), it can be seen that a roughness surface was formed on the epi surface by several hundred nm in size. In the TEM image of FIG. It can be seen that it has a form.

1 (c) illustrates the effect of the uneven surface on the light extraction, and it can be seen that the uneven surface of the surface helps to extract light more easily by changing the critical angle of the light. As such, GaN LEDs having irregularities on the surface exhibit improved light emission efficiency characteristics of about twice that of GaN LEDs having flat surfaces.

However, in the method of forming a structure for light extraction, a lot of difficulties appear in the effort to improve the light extraction efficiency because of the complex process and the characteristics change in the LED device.

In more detail, as shown in the accompanying FIG. 2, the shape of the chip is in the form of inverted pyramid (US Pat. No. 6,229,160), which has a structure like the active light emitting diode 13 and the semiconductor layer 12, The reflecting plate 11 consists of a board | substrate.

Since the light emitted from the active layer 13 is formed of the inverse pyramid type 16, the light is reflected from the sidewall 15 and thus the incident angle is decreased, thereby reducing the internal reflectance, thereby allowing more light to escape to the outside of the light emitting diode. However, such a structure is difficult to fabricate due to the complicated process due to the difficulty of forming the structure through accurate calculation of the reflection angle and the slope (β) of the laminated structure.

There is also a method of inducing diffuse reflection by forming a light emitting diode layer and then forming a groove in the upper layer of the light emitting diode (US Pat. No. 6,258,618) or forming a structure as shown in FIG. 3 (US Pat. No. 6,657,236).

However, these structures have a disadvantage of affecting the electrode formation to reduce the electro-optic efficiency of the light emitting diode.

In addition, in the process of forming the light extraction structure 39 as shown in FIG. 3, this method forms a spreading layer on the semiconductor layer 14, and the semiconductor layer by chemical vapor deposition (CVD) or sputtering. After the deposition, the photoresist is again applied to form the structure 39 by a photolithography method, and thus, a process is difficult and expensive equipment is required.

In FIG. 4, the diffuse reflection layer 45 is formed inside the light emitting diode (Korean Patent Application No. 10-2004-700976), which affects crystal growth by the internal diffuse reflection layer, which also lowers the electro-optic efficiency of the light emitting diode. .

As shown in FIG. 5, there is a method of increasing light extraction efficiency by etching a substrate or forming a structure with a dicing saw or the like, but this also requires expensive equipment such as a dicing saw machine.

As such, attempts have been made to form structures or diffuse reflection layers in various ways to improve light extraction efficiency, but there are problems that mass production is difficult due to expensive equipment, complicated processes, and changes in characteristics.

In addition, as shown in FIG. 6, a general light emitting diode package is also trapped inside the package due to total reflection of light emitted from a diode (LED). However, as described above, there are many problems in terms of complicated process and cost.

In order to solve the above problems, the present invention, by forming a light extraction layer to improve the light extraction efficiency using a UV-curable epoxy, to solve the problems of expensive equipment complex process, such as low-cost equipment and simple manufacturing process The present invention provides a highly efficient light emitting diode, a package, and a method of manufacturing the same.

In order to achieve the above object, the high-efficiency light emitting diode according to the first aspect of the present invention is a light generating unit formed of a semiconductor, a reflecting unit for collecting the generated light, and a UV curable type to extract the collected light. It includes a light extraction portion to form a structure using the epoxy.

In addition, the light generating unit preferably includes a P-type or N-type first semiconductor layer, an active layer formed on the first semiconductor layer, and a second semiconductor layer of opposite polarity to the first semiconductor layer formed on the active layer. The reflector may be formed of a metal thin film.

Furthermore, the light extraction portion may be coated with a UV curable epoxy to form a structure by applying a cured first layer and a UV curable epoxy mixed with a fluorescent material on the cured first layer.

In addition, the light extraction portion is formed by a method comprising the steps of irradiating UV through a patterned mask on the UV-curable epoxy coated layer, and etching the UV-irradiated epoxy layer using a solvent (solvant) It may be.

On the other hand, the method of manufacturing a high efficiency light emitting diode according to the second aspect of the present invention comprises the steps of forming a light generating unit consisting of a semiconductor layer on a transparent substrate, applying a UV curable epoxy on the transparent substrate and for light extraction on the applied epoxy layer Forming a structure.

The forming of the semiconductor layer may include forming a p-type or n-type first semiconductor layer, forming an active layer on the first semiconductor layer, and a second semiconductor having a polarity opposite to that of the first semiconductor layer on the active layer. It is preferred to include the step of forming a layer.

The applying of the UV curable epoxy may be performed by spin coating or roller method. The applying of the UV curable epoxy may be performed by curing the applied epoxy with UV. It is preferable to include the step of forming a layer, and forming a second layer by applying a UV-curable epoxy mixed with a fluorescent material on the first layer.

In addition, the forming of the structure may include irradiating UV through a patterned mask on the UV-curable epoxy-coated layer, and etching the UV-irradiated epoxy layer using a solvent. desirable.

The high-efficiency light emitting diode package according to the third aspect of the present invention uses a package frame to which a lead frame is attached, a light generating portion formed of the light emitting diode, and a UV curable epoxy to extract light emitted from the light generating portion. It includes a light extraction portion to form a structure.

Furthermore, the inside of the package may be filled with a UV curable epoxy, and preferably, the light extracting part is coated with a UV curable epoxy, and a fluorescent material is mixed on the cured first layer and the cured first layer. It is also possible to include a structure for light extraction on the second layer formed by applying and forming a UV-curable epoxy.

And the light extraction portion is formed by a method comprising the step of irradiating UV through a patterned mask on the UV-curable epoxy coating layer, and etching the solvent on the UV-irradiated epoxy layer (solvant) It may be.

In addition, the diode may be a diode formed with a light extraction portion forming a structure on one surface of the diode using a UV curable epoxy.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a light emitting diode package, the method comprising: attaching a light emitting diode to a lead frame in a package frame and connecting the light emitting diode with a metal wire; filling and curing the UV curable epoxy in the package frame; And applying a UV curable epoxy on the upper frame of the curable epoxy, and forming a structure for light extraction on the applied epoxy layer.

Also preferably, the light emitting diode may be a diode in which a light extraction part for forming a structure is formed on one surface of the diode using a UV curable epoxy.

In addition, the step of applying the UV-curable epoxy may be to spin coating (spin coating) or roller method (roller method), preferably, the step of applying the UV-curable epoxy curing the applied epoxy with UV (curing) ) To form a first layer, and to form a second layer by applying a UV-curable epoxy mixed with a fluorescent material on the first layer.

The forming of the structure may include irradiating UV through a patterned mask on the UV-curable epoxy-coated layer, and etching the UV-irradiated epoxy layer using a solvent. It is desirable to.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to a preferred embodiment of a high-efficiency light emitting diode, a package and a manufacturing method according to the present invention.

As a first embodiment of the present invention, FIG. 7 is a view showing the structure of a high-efficiency light emitting diode having a structure for light extraction using a UV curable epoxy.

The structure 70 is formed by using the light generating units 20, 30, and 40 formed of a semiconductor, a reflecting unit 50 for collecting the generated light, and UV curable epoxy to extract the collected and emitted light. It consists of a light extraction part.

UV curable epoxy is an epoxy resin as a main raw material, and refers to a resin that is cured in a relatively short time by the chemical action of ultraviolet rays emitted from an ultraviolet irradiation device or the like.

Looking at the advantages of such a UV-curable epoxy resin, hardening in a short time to improve productivity, and does not require BAKING during curing, less energy waste. In addition, since it is a solvent-free type, it is possible to coat a thick film by preventing environmental pollution and coating once, and it is not only applicable to a material that is difficult to heat treatment, but also easy to handle since it is a liquid type.

Therefore, by using the UV-curable epoxy in the photolithography method and the like in connection with the present invention, in forming the structure for the light extraction, it is possible to simplify the process without changing the electro-optic properties of the diode itself and to manufacture with low-cost equipment Will be.

The UV curable epoxy is Norland's NOA60 series, Summers

Optical J-91, etc. can be used, and in addition to this, any conventional UV curable epoxy that can transmit light can be used.

In addition, the light generating units 20, 30, and 40 are formed on the first semiconductor layer 20 of the P type or the N type, the active layer 30 formed on the first semiconductor layer 20, and the active layer 30 on the active layer 30. It consists of the 1 semiconductor layer 20 and the 2nd semiconductor layer 40 of opposite polarity.

Forming such a P-N junction diode and inducing light emission by D-N (donor-acceptor) recombination in the active layer 30 can further increase the light generation efficiency according to the doping material or the doping method of the active layer.

And it is preferable that the reflector 50 is formed of a metal thin film having a very high reflectance. This is to increase the extraction efficiency by collecting the emitted light to one side, and also to serve as an electrode that uniformly transmits the current to the entire surface of the semiconductor layer 40 by using a metal film.

In FIG. 8 attached as another embodiment of the present invention, the fluorescent material is mixed with the structure itself, and thus acts as a new wavelength LED.

The UV curable epoxy 70 is applied on the transparent substrate to form a structure by applying the cured first layer and the UV curable epoxy 80 mixed with fluorescent material on the cured first layer 70.

This allows the light emitted from the light generator to be absorbed by the above phosphor, and the phosphor emits light of a different wavelength from the light emitted from the light generator, thereby enabling the emission of light of various wavelengths. In particular, it is possible to act as a white LED.

And the method of forming the above structure is formed by a photolithography method by UV, as shown in Figure 9c to 9d, specifically, a patterned photo on the layer 111 coated UV curable epoxy The structure is formed by irradiating the UV 113 through the mask 112 and etching the solvent on the epoxy layer 111 irradiated with the UV 113 by a solvent.

Herein, the solvent for removing the epoxy may be acetone, ethanol, methanol, or the like. In addition, a solvent for UV curing epoxy applied to the present invention may be used.

The thickness of the coated layer 111 may be adjusted according to a method of applying a UV curable epoxy, and various types of patterns may be formed by appropriately adjusting the thickness of the UV curable epoxy, the spacing of the pattern, and the amount of UV irradiation. .

In the formation of such a pattern, a structure having a curvature which is not irradiated vertically precisely due to the diffraction phenomenon at the edge of the mask when light passes through the photomask 112 but rather reduces the incident angle of the emitted light. It can be easily formed.

Therefore, if the thickness, UV irradiation amount, time, etc. of the UV-curable epoxy is appropriately controlled, there is an advantage that various shapes having an optimal light extraction structure can be formed without changing the electro-optic properties of the diode.

As a second embodiment of the present invention, FIGS. 9A to 9D show a process related to a method of manufacturing a high efficiency light emitting diode in which a light extraction structure is formed using a UV curable epoxy.

9A, after forming the light generating units 120, 130, and 140 formed of the semiconductor layer on the transparent substrate 110, the reflective plate 150 is formed on the upper semiconductor layer, and the transparent substrate 110 is again formed as shown in FIG. 9B. After the UV curable epoxy layer 111 is formed on the substrate, a light emitting diode having a high light extraction structure as shown in FIG. 9D is manufactured by forming a structure using the UV curable epoxy of FIG. 9C.

The UV curable epoxy can be used with NOA60 series of Norland, J-91 of Summers Optical, etc. In addition to this, all UV curable epoxy that can transmit light can be used.

Here, the solvent for removing the epoxy (solvant) may generally be acetone, ethanol, methanol, and the like, in addition to that can be used a solvent exclusive of the UV curable epoxy applied to the present invention.

The thickness of the coated layer 111 may be adjusted according to a method of applying a UV curable epoxy, and various types of patterns may be formed by appropriately adjusting the thickness of the UV curable epoxy, the spacing of the pattern, and the amount of UV irradiation.

By using the UV-curable epoxy, in forming a structure for light extraction, it is possible to simplify the process and to manufacture a low-cost equipment without changing the electro-optical properties of the diode.

In the forming of the semiconductor layer, the p-type or n-type first semiconductor layer 120 is formed on the transparent substrate 110 of FIG. 9A, and the active layer 130 is formed on the semiconductor layer 120. And forming a second semiconductor layer 140 of opposite polarity to the first semiconductor layer 120 on the active layer 130.

This is to form a pn junction diode and induce light emission by DN (donor-acceptor) recombination in the active layer 130 to further increase the light generation efficiency according to the doping material or the doping method of the active layer. For sake.

In addition, the first semiconductor layer 120 is exposed by etching part of the second semiconductor layer 140 and the active layer 130 so that current can be applied through the semiconductor layer and the active layer, thereby exposing the exposed first semiconductor layer 120. The electrode 160 may be formed on an upper portion and a portion of the upper portion of the reflective plate 150.

In addition, the step of applying the UV curable epoxy in Figure 9b can be formed by spin coating (spin coating) or roller method (roller method), it is possible to easily adjust the thickness of the UV curable epoxy according to the spin speed.

In addition, Figure 10a to 10e attached as another embodiment shows a process of manufacturing a high efficiency light emitting diode manufacturing a light extraction structure using a UV-curable epoxy mixed with a fluorescent material.

In more detail, the UV curable epoxy 211 is coated on the transparent substrate 210 in FIG. 10A, and the UV curable epoxy layer 211 is cured by applying UV 213 to the UV curable epoxy layer 211 coated in FIG. 10B. In the UV-curable epoxy 214 mixed with a fluorescent material is applied.

In FIG. 10D, the UV-curable epoxy layer 214 is irradiated with UV 213 through a patterned photomask 212, and then etched with a solvent to form a structure for light extraction, as shown in FIG. 10E. 215 is formed.

In this way, the light emitted from the photo-generator is absorbed by the above phosphor, and the phosphor emits light of a different wavelength from the light emitted from the photo-generator, which makes it possible to emit light of various wavelengths. In particular, it is possible to act as a white LED, thereby producing a selective and efficient high efficiency light emitting diode.

In addition, it is also possible to use a low-cost UV fluorescent lamp as an ultraviolet light emitting device, and since the mask pattern does not need to be elaborate, the low-cost photomask 212 can easily form a pattern.

As a third embodiment of the present invention, FIG. 11A is a view illustrating a structure of a high-efficiency light emitting diode package in which a structure is formed using a UV curable epoxy for light extraction.

Specifically, the light generating unit formed of the package frame 310 and the light emitting diode 330 to which the lead frame 320 is attached, and the structure using a UV curable epoxy to extract light emitted from the light generating unit It consists of the light extraction part 360 to form.

By using the UV-curable epoxy, it is possible to easily form the structure with low-cost equipment and processes, by reducing the incident angle of the emitted light, the structure is totally reflected to prevent the escape from the inside of the package 310 It is possible to effectively increase the light extraction efficiency.

In addition, the package frame 310 may be filled with a UV curable epoxy in FIG. 11A. Since the light emitting diode 330 and the lead frame 320 are connected to the bonding wire 350, the UV cure epoxy may be wrapped and protected with UV curable epoxy. Done.

Furthermore, in FIG. 11B, the light extracting part 360 is coated with a UV curable epoxy and a UV curable epoxy mixed with a fluorescent material on the cured first layer 360 and the cured first layer 360. To form the structure 361.

In this way, the light emitted from the photo-generator is absorbed by the above phosphor, and the phosphor emits light of a different wavelength from the light emitted from the photo-generator, thereby enabling the emission of light of various wavelengths. In particular, it becomes possible to act as a white LED.

The structure 360 of the light extraction part may be formed by irradiating UV through a patterned mask on a UV-curable epoxy-coated layer, and etching the UV-etched epoxy layer using a solvent. Can be.

In this case, it is also possible to use a low-cost UV fluorescent lamp as an ultraviolet light emitting device, and since the mask pattern does not need to be elaborated, the pattern can be easily formed with a low-cost photomask 212, and the extraction efficiency is improved. Various structures can be formed that can be increased.

In addition, as shown in FIG. 12, the light generating unit is composed of a high-efficiency light emitting diode 313 in which a structure is formed using a UV-curable epoxy, thereby forming a light emitting diode package capable of increasing light extraction efficiency in twofold.

As a fourth embodiment of the present invention, FIGS. 13A to 13D illustrate a process related to a method of manufacturing a high-efficiency light emitting diode package in which a structure for light extraction is formed using a UV curable epoxy.

More specifically, as shown in FIG. 13A, the light emitting diode 403 is attached to the lead frame 402 in the package frame 401, connected to the metal wire 405, and UV inside the package frame 401. By filling the curable epoxy 404 to form a cured epoxy layer 400 to enable the structure can be formed.

In FIG. 13B, a UV curable epoxy is coated on the cured epoxy layer 400, and the coating may be performed by spin coating or a roller method. This can easily control the thickness of the UV curable epoxy according to the spin speed.

In addition, as shown in FIG. 11B, the step of applying the UV curable epoxy may be performed by curing the applied epoxy with UV to form a first layer 360, and then applying a UV curable epoxy mixed with a broadening material thereon. The structure 360 may be formable. As a result, a white LED package and a highly efficient light emitting diode package capable of generating light of various wavelengths can be manufactured.

13C is then irradiated with UV 430 through a patterned photo mask 460 to the UV curable epoxy layer 410, and then a solvent ( By etching using a solvant), the structure 460 for light extraction of FIG. 13D can be formed with low cost equipment and a simple process.

In addition, as shown in Figure 12 by using a light emitting diode in the package frame as a light emitting diode 313 formed a structure for light extraction by using a UV-curable epoxy, double light extraction structure to achieve a higher light extraction efficiency High efficiency LED package can be manufactured.

While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

As described above, by providing a highly efficient light emitting diode, a package, and a method of manufacturing the same, a structure for light extraction using a UV-curable epoxy, mass production is easy with low-cost equipment and a simple process, Since the light extraction layer can be easily implemented, a highly efficient light emitting diode and a package having excellent characteristics can be more easily manufactured.

Claims (20)

In the light emitting diode, A light generator formed of a semiconductor; A reflector for collecting the generated light; And, A light emitting diode having high efficiency comprising a light extraction unit to form a structure using a UV-curable epoxy to extract the collected and emitted light. The method of claim 1, The photo-generator includes a first semiconductor layer of P type or N type; An active layer formed on the first semiconductor layer; And, And a second semiconductor layer having a polarity opposite to that of the first semiconductor layer formed on the active layer. The method of claim 1, The reflector is a high efficiency light emitting diode, characterized in that formed of a metal thin film. The method of claim 1, The light extraction portion is coated with a UV curable epoxy cured (curing) first layer, A high-efficiency light emitting diode comprising a structure formed by applying a UV-curable epoxy mixed with a fluorescent material on the cured first layer. The method of claim 1, Irradiating UV through the patterned mask on the UV-curable epoxy-coated layer; A high efficiency light emitting diode, characterized in that formed by a method comprising the step of forming a structure by etching using a solvent (solvant) to the UV-irradiated epoxy layer. In the manufacturing method of the light emitting diode, Forming a light generating unit including a semiconductor layer on the transparent substrate; Forming a reflector on the second semiconductor layer; Applying a UV curable epoxy on the transparent substrate; And, Forming a structure for light extraction on the applied epoxy layer comprising the step of forming a high efficiency light emitting diode. The method of claim 6, The forming of the semiconductor layer may include forming a p-type or n-type first semiconductor layer on the transparent substrate; Forming an active layer on the first semiconductor layer; And, And forming a second semiconductor layer having a polarity opposite to that of the first semiconductor layer on the active layer. The method of claim 6, The step of applying the UV-curable epoxy is a method of manufacturing a high efficiency light emitting diode, characterized in that by spin coating (roller method) or a roller method (roller method). The method of claim 6, The coating of the UV curable epoxy may include forming a first layer by curing the applied epoxy with UV. And forming a second layer by applying a UV-curable epoxy mixed with a fluorescent material on the first layer. The method of claim 6, The forming of the structure may include irradiating UV through a patterned mask on the UV-curable epoxy-coated layer; Method for producing a high-efficiency light emitting diode comprising the step of etching by using a solvent (solvant) to the UV-irradiated epoxy layer. In the light emitting diode package, A package frame to which a lead frame is attached; A light generator formed of a light emitting diode; And, A high efficiency light emitting diode package comprising a light extraction unit for forming a structure using a UV-curable epoxy to extract light emitted from the light generating unit. The method of claim 11, High efficiency light emitting diode package, characterized in that the inside of the package is filled with a UV curable epoxy. The method of claim 11, The light extraction portion is coated with a UV curable epoxy cured (curing) first layer, A high-efficiency light emitting diode package comprising applying a UV-curable epoxy mixed with a fluorescent material on the cured first layer to form a structure. The method of claim 11, Irradiating UV through the patterned mask on the UV-curable epoxy-coated layer; A high-efficiency light emitting diode package formed by the method comprising the step of etching using a solvent (solvant) to the UV-irradiated epoxy layer. The method of claim 11, The light emitting diode is a high-efficiency light emitting diode package, characterized in that the diode is formed with a light extraction portion forming a structure on one surface of the diode using a UV curable epoxy. In the method of manufacturing a light emitting diode package, Attaching a light emitting diode to a lead frame in the package frame and connecting the metal wire with a metal wire; Filling and curing the UV curable epoxy in the package; Applying a UV curable epoxy to the cured UV curable epoxy layer, and The method of manufacturing a high-efficiency light emitting diode package comprising the step of forming a structure for light extraction on the applied epoxy layer. The method of claim 16, The step of applying the UV curable epoxy is a method of manufacturing a high-efficiency light emitting diode package, characterized in that the spin coating (spin coating) or roller method (roller method). The method of claim 16, The coating of the UV curable epoxy may include forming a first layer by curing the applied epoxy with UV. And forming a second layer by applying a UV-curable epoxy mixed with a fluorescent material on the first layer. The method of claim 16, The forming of the structure may include irradiating UV through a patterned mask on the UV-curable epoxy-coated layer; Method of manufacturing a high-efficiency light emitting diode package, characterized in that it comprises the step of etching by using a solvent (solvant) to the UV-irradiated epoxy layer. The method of claim 16, The light emitting diode is a method of manufacturing a high-efficiency light-emitting diode package, characterized in that the diode formed with a light extraction portion forming a structure on one surface of the diode using a UV curable epoxy.

Images