WO2011123987A1

WO2011123987A1 - Encapsulation structure and method for light wavelength converting material, and led

Info

Publication number: WO2011123987A1
Application number: PCT/CN2010/000466
Authority: WO
Inventors: 李屹; 吴忠威; 杨毅
Original assignee: 绎立锐光科技开发(深圳)有限公司
Priority date: 2010-04-09
Filing date: 2010-04-09
Publication date: 2011-10-13

Abstract

An encapsulation structure for light wavelength converting material comprises a light wavelength converting material (2), and a first and a second air insulation mediums (1, 5), wherein the light wavelength converting material (2) is sandwiched in between the first and second air insulation mediums (1, 5) from two sides. An encapsulation method includes a process of enclosing the light wavelength converting material (2) between the first and second air insulation mediums (1, 5) with a filling (3), and a process of hermetically connecting the air insulation mediums (1, 5) and/or the filling (3) using an adhesive medium (4). At least one of the first and second air insulation mediums (1, 5) is transparent. An LED (7) comprises a light wavelength converting material (2), an air insulation medium (1), a filling (3), and an adhesive medium (4).

Description

Package structure, method and LED of optical wavelength conversion material

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light wavelength conversion material, and more particularly to a packaging method and structure for moisture and oxidation resistance of a light wavelength conversion material.

BACKGROUND OF THE INVENTION With the development of technology and the expansion of application fields, there are more and more types of optical wavelength conversion materials. Phosphors are commonly used today, and their service life is greatly affected by the surrounding environment, such as moisture and air (oxygen in the air). Light wavelength conversion materials currently known are phosphors, dyes or nanoluminescent materials. It is important to protect these light wavelength conversion materials, including phosphors, from moisture and oxidation. The existing solution mainly involves coating a film of other material on the phosphor particles to insulate the air to protect the phosphor. The coated material includes silicon oxide, titanium oxide, aluminum oxide, aluminum phosphate, and the like. For example, Chinese Patent Application No. 98122739 discloses a solution for placing a treated electroluminescent powder into a specially formulated organic colloidal coating liquid, vacuum drying and high temperature sintering in air, in an electroluminescent material. The surface chemistry forms oxides, compound films, and composite films thereof. Chinese Patent Application No. 200710097598.0 discloses a solution for forming a film by mixing a transparent colloid such as silica gel or epoxy glue with a phosphor. A similar solution is also disclosed in US Patent Application No. US 2008/0003160 A1 and U.S. Patent No. 6,346,326 B1. The above prior art has the disadvantage that when the film is coated on the surface of the phosphor particles, the life of the phosphor can be prolonged, but the light from the phosphor is absorbed by the absorption and reflection of the light by the film itself. It is weakened, and the high process complexity of the oxidation treatment will bring about an increase in cost. When the silica gel or epoxy glue is used to form a film, although it helps to improve the utilization efficiency of the phosphor light intensity, it is due to the silica gel. Or epoxy glue generally does not function to block oxygen and water vapor in the air, which is not conducive to maximizing the life of the phosphor. In addition, the existing mixing or film coating process can also cause a certain agglomeration of the phosphor particles, and even the phosphor particles are destroyed, which will affect the luminescent properties of the phosphor powder or the fluorescent film.

1

Confirmation SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to address the deficiencies of the prior art, and to provide a packaging method and structure, and an LED light source using the same, so that the optical wavelength conversion material does not reduce the luminance of the light. It can also extend the service life. In order to solve the above technical problem, the basic idea of the present invention is: if a transparent material is used to integrally encapsulate the light wavelength conversion material, it is advantageous to maintain the light-emitting brightness of the material without changing the properties of the light wavelength conversion material; If a transparent material, such as glass, is used to seal the optical wavelength converting material together with the insulating filler to isolate it from the air, the purpose of extending the life of the optical wavelength converting material can be achieved at the same time. As a technical solution for implementing the inventive concept, a method for packaging a light wavelength conversion material is provided, and particularly comprising: a step of enclosing a light wavelength conversion material between the first and second air isolation media using a filler; The step of sealingly connecting the first and second air-isolated media and/or the filler with an adhesive medium; wherein at least one of the first and second air-isolated media is made of a transparent material.

The above solution further includes the step of plating an optical film on the transparent material; the optical film is for controlling the propagation of light from the light wavelength converting material.

In the above solution, the first or second air separation medium using the transparent material comprises a glass piece, an alumina piece, a sapphire piece, a quartz piece or a plexiglass piece.

In the above solution, the filler may include a metal, plastic or special tape that is impervious to water or air; or a glue that includes a low water permeability; or includes a pressure sensitive adhesive. In the above solution, the method further includes a step of reflecting a light from the light wavelength conversion material by applying a reflective tape or a reflective film on a surface of the first and second air isolation media; the surface is coated with a reflective tape or plated The medium of the reflective film may be made of an opaque heat-dissipating material, or a transparent material may be used together with the other of the air-isolated medium. In the above solution, the method further includes the step of providing a low refractive index dielectric layer between the first and second air isolation media such that the thickness of the filler is slightly larger than the thickness of the light wavelength conversion material. In the above solution, the thickness of the low refractive index dielectric layer is less than one tenth of the diameter of the circumcircle of the spot of the excitation light on the wavelength conversion material layer. As a technical solution for implementing the inventive concept, a package structure of a light wavelength conversion material is provided, and Including a light wavelength conversion material, in particular: further comprising first and second air isolation media sandwiching the light wavelength conversion material from both sides, surrounded by the first and second air isolation media a filler of the light wavelength conversion material, and an adhesion medium sealingly connecting the first and second air isolation media and/or the filler between the first and second air isolation media; At least one of the second air separation media is made of a transparent material. In the above solution, the adhesive medium is interposed between the first air separation medium and the filler, and between the second air separation medium and the filler. In the above solution, the adhesive medium is interposed between the first air isolation medium and the second air isolation medium to accommodate the filler. In the above solution, the first or second air separation medium surface of the enamel transparent material further includes an optical film layer for changing light propagation. In the above solution, one of the first and second air isolation media further includes a reflective film layer for reflecting light from the optical wavelength conversion material, the medium or the opaque heat dissipation material, or Another of the air isolation media utilizes a transparent material. As a technical solution for realizing the inventive concept, an LED light source is provided, including a light wavelength conversion material and an LED distributed on a substrate, the light wavelength conversion material surrounding a light emitting surface of the LED, in particular: The light source further includes an air isolating dielectric sheet using a transparent material covering the optical wavelength converting material; a filler filled between the substrate and the air isolating dielectric sheet and surrounding the optical wavelength converting material; A dielectric is filled between the substrate and the sheet of air-isolated dielectric to sealingly connect the substrate and the sheet of air-isolated media and/or the filler. In the above solution, a light collecting assembly having an open end is further included, and the LED and the light wavelength conversion material are contained on the substrate, and the LED is at a smaller open end thereof.上述Using the above various technical solutions, the optical wavelength conversion material has the advantages of simple structure, simple process, and easy realization at low cost, under the premise of optimally considering the brightness and the service life of the light wavelength conversion material.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view showing a package structure of a light wavelength conversion material of the present invention;

Figure 2 is a cross-sectional view taken along line A - A of the structure of Figure 1; Figure 3 is a schematic view showing the structure of the structure of Figure 1;

Figure 4 illustrates one of the variant embodiments of the structure of Figure 1 in use;

FIG. 5 illustrates the effect of the package structure of the present invention through a life curve diagram; FIG. 6 illustrates a second embodiment of the structure of the structure of FIG. 1 in the use of an LED light source; wherein, the reference numerals are: Transparent material layer, 2 - light wavelength conversion material, 3 - filler, 4 - one adhesion medium, 5 - a second transparent material layer, 6 - a base with a reflective surface, 7 - one LED, 8 a light collecting component,

12-one low refractive index dielectric layer. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be further described with reference to the preferred embodiments shown in the drawings. The method for packaging a light wavelength conversion material of the present invention comprises the steps of:

Using a filler to enclose the optical wavelength conversion material between the first and second air isolation media;

The first and second air-isolation media and/or the filler are sealingly connected using an adhesive medium; wherein at least one of the first and second air-isolated media is made of a transparent material. The structure of the package as described above can be illustrated by taking a cross-sectional view of Fig. 1 as an example. As shown, the first air separation medium 1 and the second air isolation medium 5 sandwich the optical wavelength conversion material 2 from the sides, for example, up and down, and the filler 3 is interposed between the first and second air. The optical wavelength converting material is surrounded between the media. The enveloping manner can be illustrated in more detail by the cross-sectional view of the structure shown in FIG. 2: the optical wavelength conversion material 2 is surrounded by the filler 3, and is further divided by the first air separation medium 1 and the second air isolation medium 5 Surrounded by.

An adhesive medium 4 interposed between the first and second air separation media for sealingly connecting the first air isolation medium 1, the second air isolation medium 5 or the filler 3 to make the wavelength of the light The conversion material 2 is completely sealed and isolated from the air. The structure may be as shown in FIG. 1, with an adhesive medium 4 interposed between the first air separation medium 1 and the filler 3, and between the second air separation medium 5 and the filler 3. .

The filler 3 may be metal, plastic or special tape that is impervious to water or air. Because the thickness of the layer where the light wavelength conversion material is generally small is small, compared with the prior art, most of the contact structure of the package structure is in contact with the outside, and the contact surface of the filler with the outside is relatively small. The filler 3 can also be used with materials that are not required for water permeability, such as glue, including 353ND glue supplied by Epo-tek or epoxy glue which can be cured under certain conditions. The adhesive medium 4 comprises glue or a pressure sensitive adhesive. The pressure sensitive adhesive is a pressure-sensitive adhesive Special double-sided tape for knotting.

In fact, in order to simplify the production process, in the case where the performance requirements are not critical, the adhesive medium 4 and the filler 3 may be combined into one, for example, a pressure sensitive adhesive, which avoids the glue contamination. The light wavelength conversion material ² has reached the original intention of sealing. For example, if the thickness of the light wavelength conversion layer is 0.1 mm, if the glue is directly used as the filler 3 and the adhesion medium 4, when the fluidity of the glue is relatively good, it is likely to be difficult to control and contaminate the light in the actual operation. The wavelength conversion material; in addition, compared with the structure of Fig. 1, the contact surface of the glue with the outside is relatively large (the thickness of the contact of the glue with the outside can be reduced to 0.005 mm in Fig. 1), thereby the transmittance of air and water vapor. Relatively large, the sealing effect will be worse. An improved structure as shown in Figure 3 will produce better results than Figure 1. Compared with FIG. 1, the adhesive medium 4 in the structure of FIG. 3 is interposed between the first air separation medium 1 and the second air separation medium 5, and accommodates the filler 3. Selecting such that the thickness of the filler 3 is slightly larger than the thickness of the light wavelength conversion material 2, at least one low between the first and second air isolation media 1, 5 and the light wavelength conversion material 2 may be disposed. Refractive index dielectric layer 12. The low refractive index dielectric layer may be a thin air layer, or a layer, or an inert gas layer having a refractive index lower than a refractive index of the optical wavelength conversion material. The low refractive index dielectric layer may also be a low refractive index epoxy layer having a refractive index of less than 1.38. Thus, the large-angle emergent light (including the excited light and the excitation light) from the light wavelength conversion material layer will be totally reflected back to the light wavelength conversion material layer 2, and the exit angle is changed by the scattering of the light wavelength conversion material, with a view to It is used twice, which ultimately helps to improve the wavelength conversion efficiency of light. In addition, when the adhesive medium 4 is glue, as shown in the figure, the glue only penetrates into the filler 3 and the first and second air separation media 1 and 5 based on the capillary phenomenon. The gap is not contaminated by the light wavelength converting material 2. Taking the packaged phosphor as an example, the test verifies that the thickness of the low refractive index dielectric layer is less than a predetermined degree, for example, one tenth of the diameter of the circumcircle of the spot of the excitation light on the phosphor layer, and the brightness of the excited light It is especially good to improve the effect. In the encapsulation method and structure of the present invention, at least one of the first and second air separation media 1 and 5 is made of a transparent material, which is advantageous for maintaining the brightness of the emitted light of the optical wavelength conversion material. Therefore, the first and second air separation media 1, 5 may be a glass piece, an alumina piece, a sapphire piece, a quartz piece or a plexiglass piece, composed of a dense material that is impermeable to air and moisture, or other water permeability. A medium composed of a low transparent material will also be within the scope of the present invention.

In the structure shown in FIG. 1 and FIG. 3, the first and second air isolation media 1, 5 may each adopt a transparent material. The materials are all in the form of flakes. The light wavelength conversion material thus encapsulated can be easily used by various products and is easy to replace, and the light wavelength conversion material can be prevented from being damp or oxidized during transportation and before use. In use, it is suitable for the case where the excitation light is incident from one side and the excitation light is emitted from the other side.

The method or structure of the present invention can be modified as shown in Figure 4 for the case where the excitation light and the excited light are incident and ejected from the same side. For example, a reflective tape (such as a tape available from 3M Company) or a reflective film is applied to the surface of the second air separation medium 5 (the second air separation medium 5 or even a transparent material) to reflect light from the surface. The wavelength of the material of the wavelength conversion material. The reflective film may be a metal plating film, a dielectric reflective film or a metal-medium mixed reflective film. In contrast to Figures 1 and 3, the second air separation medium 5 is replaced by a medium 6 with a reflective film layer in Figure 4 . The medium 6 may also be a heat sink base composed of an opaque heat conductive material such as, but not limited to, metal or silicon, and a side close to the light wavelength conversion material 2 includes a light reflecting film layer. The reflective film layer can even be replaced by a polished surface of the heat sink base. The method of the present invention also includes the step of plating an optical film on the transparent material; the optical film is used to control the propagation of light from the optical wavelength converting material, including changing the direction of propagation of a portion of the light or the range of the outgoing wavelength of the selected light. . The outer surface of the first air-isolation medium 1 in the structure of, for example, FIGS. 1, 3, and 4 includes an optical film layer, such as a filter film having an angle selection function, which allows excitation light to be emitted within a predetermined incident angle range, thereby improving The brightness of the emitted light of the light wavelength conversion material. Even the first air separation medium 1 is colored glass, and the color of the emitted light can be controlled. The invention has been experimentally verified, as shown in Fig. 5, taking the phosphor as an example, the conversion efficiency of the unsealed phosphor decreases rapidly with time, as indicated by the dotted line curve, and the conversion efficiency after 400 hours is only original. 20%. However, after encapsulation by the method of the present invention, as indicated by the solid curve, the conversion efficiency is still more than 95% after 1000 hours, and the service life and conversion efficiency are greatly improved. However, the prior art film coating method has been disclosed in the literature, and it is necessary to coat two or more oxide films to have a similar effect, but it is undoubtedly to lose part of the emitted light brightness, and the processing process is complicated and the cost is high. Applying the above structure to the LED light source, as shown in FIG. 6 : the light source comprises a light wavelength conversion material 2 and an LED 7 distributed on the substrate, the light wavelength conversion material 2 surrounding the light emitting surface of the LED 7; Also included is an air isolating dielectric sheet 1 using a transparent material covering the optical wavelength converting material 2; a filler 3 filling between the substrate and the air isolating dielectric sheet and surrounding the optical wavelength converting material 2 Adhesion medium, filled in the substrate and air separated The substrate and the air isolating dielectric sheet 1 and/or the filler 3 are hermetically sealed from between the dielectric sheets 1.

The light source further includes a light collecting assembly 8 open at both ends, on which the LED and the optical wavelength converting material 2 are contained, the LED 7 having a smaller open end therein. The light collecting assembly 8 can be a reflective cup.

Claims

Claim

A method of packaging a light wavelength conversion material, comprising:

a step of enclosing the optical wavelength converting material between the first and second air separating media using a filler; sealing the first and second air insulating media and/or the filler using an adhesive medium; Wherein at least one of the first and second air isolation media is made of a transparent material.

2. The method of packaging a light wavelength conversion material according to claim 1, wherein:

The light wavelength converting material comprises a phosphor, a dye or a nano luminescent material.

3. The method of packaging a light wavelength conversion material according to claim 1, further comprising:

a step of plating an optical film on the transparent material; the optical film is used to control the propagation of light from the optical wavelength conversion material.

4. The method of packaging a light wavelength conversion material according to claim 1 or 3, characterized in that:

The first or second air separation medium using the transparent material comprises a glass sheet, an alumina sheet, a sapphire sheet, a quartz sheet or a plexiglass sheet.

5. The method of packaging a light wavelength conversion material according to claim 1, wherein:

The filler may comprise a metal, plastic or special tape that is impervious to water or air; or a glue that includes a low water permeability.

6. The method of packaging a light wavelength conversion material according to claim 1, wherein:

The filler also includes a pressure sensitive adhesive.

7. The method of packaging a light wavelength conversion material according to claim 1, wherein:

The adhesive medium comprises a glue or a pressure sensitive adhesive.

8. The method of packaging a light wavelength conversion material according to claim 1, wherein the method comprises: applying a reflective tape or a reflective film on a surface of the first and second air isolation media to reflect The step of converting light of the wavelength conversion material;

The surface-attached reflective tape or reflective film-coated medium either uses an opaque heat-dissipating material or is made of a transparent material with another of the air-isolated media.

9. The method of packaging a light wavelength conversion material according to claim 1, comprising:

The step of providing a low refractive index dielectric layer between the first and second air isolation media such that the thickness of the filler is slightly larger than the thickness of the light wavelength conversion material.

10. The method of packaging an optical wavelength conversion material according to claim 9, wherein:

The low refractive index dielectric layer is either a thin air layer; or an inert gas layer; or a low refractive index epoxy layer having a refractive index of less than 1.38.

1 . The method of packaging a light wavelength conversion material according to claim 9, wherein:

The thickness of the low refractive index dielectric layer is less than one tenth of the circumscribed diameter of the spot of the excitation light on the wavelength converting material layer.

12. A package structure for a light wavelength conversion material, comprising a light wavelength conversion material, characterized by:

The first and second air isolation media sandwiching the light wavelength conversion material from both sides, and the filler surrounding the light wavelength conversion material between the first and second air isolation media, and An adhesive medium sealingly connecting the first and second air separation media and/or the filler between the first and second air separation media; at least one of the first and second air isolation media Use transparent materials.

13. The package structure of an optical wavelength conversion material according to claim 12, wherein:

The adhesive medium is interposed between the first air separation medium and the filler, and between the second air separation medium and the filler.

14. The package structure of an optical wavelength conversion material according to claim 13, wherein:

The adhesion medium and the filler are a unitary material.

15. The package structure of an optical wavelength conversion material according to claim 12, wherein:

The adhesive medium is interposed between the first air separation medium and the second air isolation medium to contain the filler.

16. The package structure of an optical wavelength conversion material according to claim 12, wherein:

The first or second air separation medium surface of the enamel transparent material further includes an optical film layer for changing light propagation.

17. The package structure of an optical wavelength conversion material according to claim 12, wherein:

One of the first and second air isolating media further includes a reflective film layer for reflecting light from the optical wavelength converting material, the dielectric or opaque heat dissipating material, or another The air isolation media are made of a transparent material.

18. The package structure of an optical wavelength conversion material according to claim 17, wherein:

The first or second air separation medium of the transparent material is in a sheet-like structure.

19. The package structure of an optical wavelength conversion material according to claim 17, wherein:

The first or second air separation medium including the reflective film layer is a heat dissipation base.

20. An LED light source comprising a light wavelength conversion material and an LED distributed on a substrate, the light wavelength conversion material surrounding a light emitting surface of the LED, wherein: the light source further comprises

An air isolating dielectric sheet using a transparent material covering the optical wavelength converting material;

a filler interposed between the substrate and the air isolation dielectric sheet and surrounding the optical wavelength conversion material; an adhesion medium filled between the substrate and the air isolation dielectric sheet to sealingly connect the substrate and Air isolating the sheet of media and/or the filler.

21. The LED light source of claim 20, wherein:

Also included is a light collecting assembly having an open end, the LED and the optical wavelength converting material being contained on the substrate, the LED having a smaller open end therein.

22. The LED light source of claim 20, wherein:

The light collecting component is a reflective cup.