CN108321285A - A kind of white light LEDs patterned fluorescent membrane structure and preparation method thereof - Google Patents

Abstract

The invention discloses a patterned fluorescent film structure for white light LEDs and a preparation method thereof. The method comprises the following steps: (1) Weighing several groups of fluorescent powders and adhesives as raw materials and mixing them uniformly to form several groups of Fluorescent glue mixture; (2) Vacuum and defoam several groups of fluorescent glue mixtures that are uniformly mixed; (3) Inject several groups of fluorescent glue mixtures into different parts of the designed mold to form different types (4) heating and curing several groups of fluorescent glue mixture poured into the mold together with the mold, and obtaining a patterned fluorescent film for white LEDs after demoulding. The invention solves the problem of the reabsorption effect of the red fluorescent powder on the yellow or green fluorescent powder caused by the mixing of fluorescent powder in the traditional glue dispensing method, and reduces the loss of light.

Description

A patterned fluorescent film structure for white light LED and its preparation method

technical field

The invention belongs to the field of LED packaging, and relates to a patterned fluorescent film structure for white LEDs and a preparation method thereof.

Background technique

As a new type of high-efficiency solid-state light source, white LED has attracted extensive attention from experts and scholars in the field due to its remarkable advantages such as energy saving, high efficiency, environmental protection, pollution-free, and long life. One of the new industries, it is considered to be the fourth generation of lighting sources with broad application prospects.

At present, industrialized white LEDs realize white light through light conversion methods. The traditional packaging method is to coat a mixture of phosphor powder and silica gel on the surface of blue LED chips. The specific implementation process is as follows: first, fix the blue LED chip on the bracket, connect the circuit, weigh a certain amount of silica gel or epoxy resin and phosphor powder, mix the phosphor powder and silica gel or epoxy resin evenly in an appropriate proportion, and pump After vacuum and defoaming, use a glue dispenser to apply phosphor glue on the surface of the blue-ray chip, and finally put it in an oven to cure it. This method is commonly known as glue dispensing. Combine one or more LEDs together and connect the circuit to form the desired LED light.

However, there are still important problems in the following aspects in the current LED packaging process:

First, the packaging method of industrialized LEDs is dispensing, so it is difficult to keep the concentration of phosphor powder consistent. This is because the fluorescent powder glue drops on the LED chip by gravity during dispensing, and the density of the phosphor powder is also higher than that of silica gel. There must be continuous precipitation of the phosphor powder in the silica gel or epoxy resin as the dispensing time goes by. At the same time, as the dispensing process goes on, since the phosphor powder and glue mixture is placed in the feeding cylinder in a vertical state, the phosphor powder will inevitably settle to the bottom of the feeding cylinder, which will lead to the loss of phosphor powder when dispensing later. The concentration is getting less and less, and eventually the same batch or different batches of LED light chromaticity are not exactly the same, so the factory has to re-split light according to different light color parameters of LEDs, which increases the cost of manpower and material resources;

Second, the thickness of a single LED dispensing is also difficult to achieve consistency. For a single LED package, the fluorescent powder glue is approximately spherical and drips from the dispensing head on the chip. After the fluorescent glue is naturally leveled and cured, the surface is convex, thick in the middle and thin around the periphery, so the light color in the middle and surrounding of the LED is also the same. necessarily inconsistent;

Third, the heat dissipation of LEDs and the thermal aging of phosphors. LEDs will generate a lot of heat after working for a long time. The traditional dispensing method of fluorescent powder glue wraps the LED chip. The heat generated by the chip is difficult to dissipate in time. The temperature around the chip continues to rise, resulting in a reduction in the service life of the chip. At the same time, the phosphor will be heated and aged, resulting in a continuous decrease in luminous efficiency, which will eventually lead to a decrease in the light conversion efficiency of the LED and a decrease in the service life of the LED;

Fourth, there is a reabsorption effect of phosphors between different phosphors. Due to the low color rendering index of LEDs when packaged with a single yellow or green phosphor, it is difficult to meet the needs of daily lighting. Red phosphors are usually added to improve the color rendering index of LEDs. In the traditional dispensing method, yellow or green fluorescent When the powder is mixed with the red phosphor, there is a spectral overlap between the excitation spectrum of the red phosphor and the emission spectrum of the green or yellow phosphor, and the red phosphor will have a reabsorption effect on the green or yellow phosphor, and the red phosphor will reabsorb Absorb part of the yellow light or green light, resulting in light loss and lower light conversion efficiency.

In view of the above reasons, industry experts and researchers have proposed a packaging method for fluorescent films to overcome the shortcomings of the above-mentioned glue dispensing method, such as "a kind of LED phosphor film suitable for making white LED phosphor film by slit coating method" disclosed in Chinese patent document CN102931326A Phosphor powder slurry and its preparation method”, the thickness of the prepared film is controllable, which solves the problem of inconsistency of LED light output under the same batch in dispensing. Another example is "a remote phosphor light distribution film and its preparation method" disclosed in Chinese patent document CN103943761A. The composition of the composite layer also solves many problems in the dispensing method. However, the preparation methods of the above-mentioned disclosed patent documents all need to add many other organic solvents.

Contents of the invention

The present invention provides a new patterned fluorescent film structure, which is used in the field of white light LEDs. Different types of phosphors are separated and combined alternately in the fluorescent film, which can reduce the impact of red phosphors on green or yellow phosphors. Reabsorption effect, and also achieved the purpose of combination, thereby improving the light conversion efficiency.

The present invention also provides a method for preparing a patterned fluorescent thin film structure, which can reduce the reabsorption effect of red phosphor on green or yellow phosphor by separating different phosphors and combining them alternately. The raw materials and process are simple, and the raw materials used are still silica gel or epoxy resin and phosphor powder used in the traditional dispensing method, but it solves the problem of poor consistency of LED light and color in the traditional dispensing method, and will not affect the optical properties of the film. Performance is adversely affected, and packaging process steps are reduced, reducing factory production costs.

Technical scheme of the present invention is as follows:

A method for preparing a patterned fluorescent film structure for white light LEDs, the method mainly comprising the following steps:

(1) Weigh several groups of phosphors and adhesives as raw materials, and mix each group of phosphors and adhesives uniformly at a mass ratio of 0.1 to 1:1 to form several groups of fluorescent adhesive mixtures;

(2) Vacuumize and defoam the fluorescent glue mixture of several groups uniformly mixed;

(3) adding several groups of fluorescent glue mixtures into different parts of the pre-set mold with a thickness of 0.1 to 1 cm to form a combined structure in which different types of fluorescent glue mixtures are alternated;

(4) heating and curing several groups of the fluorescent glue mixture together with the mold;

(5) After demoulding, a patterned fluorescent film structure for white light LEDs can be obtained at one time.

The patterned structure in the present invention refers to a variety of fluorescent film structures with different shapes and sizes, which are composed of different kinds of phosphors and adhesives mixed in alternate combinations, and are different due to the combination of different phosphors. Patterns of various shapes are formed.

Preferably, the heat curing in the step (4) is as follows: first bake at 60-90° C. for 20-40 minutes, and then transfer to 120-160° C. and bake for 20-40 minutes.

Preferably, the several groups of phosphors mentioned in the step (1) include yellow or green phosphors, and red phosphors. More preferably, the yellow or green phosphor is YAG-based, LuAG-based, silicate, aluminate, etc., and the red phosphor is nitride or fluoride red phosphor.

Preferably, the adhesive in the step (1) is selected from one or more of silica gel, epoxy resin, silicone material, and acrylic resin.

Preferably, the specific ratio of phosphor powder and binder in each group of phosphor glue mixture in the step (1) can be adjusted according to the required light and color parameters of the LED.

Preferably, the shape of the mold in the step (3) is not limited, for example, it can be any desired shape such as a circle, a square, a rectangle, an ellipse, a rhombus, etc., wherein the two phosphors are distributed in an alternating combination of yellow and red Or the combination of green and red alternately, the combination can be any desired shape such as circular ring, square ring, fan, square, stripe, diagonal stripe, spiral fan, etc.

Preferably, in the step (3), the fluorescent glue mixture is injected into the mould, and the process method used may be a coating method, a screen printing method, a spraying method, a 3D printing method, etc., wherein the specific process methods are all As a technical problem, the preparation of fluorescent thin films can be realized through continuous improvement of process technology.

Preferably, for the mold described in step (3), the material of the mold must be able to withstand a high temperature above 180°C, not deform or decompose under high temperature, have a smooth surface, and can be flexibly designed, assembled and disassembled.

Preferably, the overall shape and size of the mold in the step (3), the shapes of different parts inside, the number of rings, blocks, sectors, stripes, etc. of different types of phosphors are not fixed. Personnel can design and change according to actual needs, as long as yellow or green fluorescent films and red fluorescent films are alternately combined.

Preferably, the thickness of the patterned fluorescent film structure for white light LEDs is (0.1-1 mm)±0.05 mm.

The present invention also provides a patterned fluorescent film structure for white light LEDs, comprising a plurality of fluorescent film parts, the plurality of fluorescent film parts are combined into a pattern, and the arrangement structure of the plurality of fluorescent film parts is: The fluorescent film parts of different kinds of fluorescent powder are arranged alternately.

Preferably, the thickness of the patterned fluorescent film structure for white light LEDs is (0.1-1mm)±0.05mm.

In a preferred embodiment, the patterned fluorescent film structure for white light LEDs includes a plurality of red fluorescent film parts made of red phosphor powder, and also includes a plurality of yellow fluorescent film parts made of yellow phosphor powder or a plurality of green fluorescent film parts. The green fluorescent film parts made of powder, the red fluorescent film parts and the yellow fluorescent film parts or the green fluorescent film parts are arranged alternately.

In some embodiments, the shape of the patterned fluorescent film structure for white light LEDs can be circular, square, rectangular, elliptical or rhombus, and the combination of the plurality of fluorescent film parts can be circular. , Square ring, fan, square, stripe, diagonal stripe, spiral fan.

Preferably, the patterned fluorescent thin film structure for white light LED is prepared by the above-mentioned preparation method.

Compared with the prior art, the beneficial effects of the present invention are as follows:

First. In the preparation method of the present invention, the raw materials used in the preparation of the patterned fluorescent film structure can still use the raw materials used in the traditional dispensing method, without adding other substances, which saves costs and reduces environmental pollution; And the prepared fluorescent film maintains the good optical performance of phosphor powder;

Second. In the preparation method of the present invention, the use of fluorescent film to encapsulate the LED can solve the problems of phosphor powder precipitation in the traditional dispensing method, poor consistency of LED light and color, and unfavorable LED heat dissipation;

Third. The patterned fluorescent thin film structure and its preparation method of the present invention, adopting the method of patterning, separate yellow or green phosphors from red phosphors and alternately combine them, which can not only improve single yellow or green phosphors The problem of low color rendering index of powder-encapsulated LEDs can also solve the reabsorption effect of red phosphors on yellow or green phosphors caused by the traditional dispensing method or the mixing of two phosphors in general fluorescent films, resulting in reduced LED luminous efficiency And other issues;

Fourth. The patterned fluorescent film structure and its preparation method of the present invention adopts the fluorescent film encapsulation method, which saves the dispensing process in the traditional dispensing method, reduces the encapsulation process steps, and reduces the production cost of the factory.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

Fig. 1 is the structural diagram of the annular fluorescent film of embodiment 1 of the present invention;

Fig. 2 is the structural diagram of the first kind of circular fluorescent film of embodiment 2 of the present invention;

Fig. 3 is the structure diagram of the second kind of circular fluorescent film of embodiment 2 of the present invention;

Fig. 4 is the structure diagram of the third kind of circular fluorescent film of embodiment 2 of the present invention;

Fig. 5 is the structural diagram of the spiral fan-shaped fluorescent film of embodiment 3 of the present invention;

Fig. 6 is the structural diagram of the first square ring type fluorescent film of the embodiment 4 of the present invention;

Fig. 7 is the structure diagram of the second square ring type fluorescent film of the embodiment of the present invention 4;

FIG. 8 is a structural diagram of the first strip-shaped fluorescent film according to Embodiment 5 of the present invention;

FIG. 9 is a structural diagram of the second strip-shaped fluorescent film according to Embodiment 5 of the present invention;

10 is a structural diagram of the first oblique stripe fluorescent film in Example 6 of the present invention;

11 is a structural diagram of the second oblique stripe fluorescent film in Example 6 of the present invention;

Fig. 12 is a structural diagram of the first bulk fluorescent film according to Embodiment 7 of the present invention;

Fig. 13 is a structural diagram of the second bulk fluorescent film according to Embodiment 7 of the present invention;

Fig. 14 is a structural diagram of the third bulk fluorescent film according to Embodiment 7 of the present invention;

Fig. 15 is a structure diagram of the fourth bulk fluorescent film according to Embodiment 7 of the present invention;

In the above Figures 1-15, the number 1 represents the part of the yellow or green fluorescent film, and the number 2 represents the part of the red fluorescent film.

Detailed ways

The invention discloses a patterned fluorescent film structure for white light LEDs and a preparation method thereof. The method comprises the following steps: (1) Weighing several groups of phosphors and adhesives as raw materials, and weighing them according to the ratio of 0.1 to 1:1 The mass ratios are mixed uniformly to form several groups of fluorescent glue mixtures; (2) several groups of uniformly mixed fluorescent glue mixtures are vacuumed and defoamed; (3) several groups of fluorescent glue mixtures are injected into the designed shapes respectively In different parts of the mold with a thickness of 0.1-1cm, a combined structure of different types of fluorescent glue mixtures is formed alternately; (4) Several groups of fluorescent glue mixtures poured into the mold are heated and cured together with the mold, and white light LEDs are obtained after demoulding Fluorescent films with patterned structures. The invention adopts the way that two kinds of fluorescent powders in the fluorescent film are separately arranged alternately and combined, which solves the problem of the reabsorption effect of the red fluorescent powder on the yellow or green fluorescent powder caused by the mixing of the fluorescent powders in the traditional dispensing method, and reduces the light emission. Loss.

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention, not to limit the protection scope of the present invention. Improvements and adjustments made by those skilled in the art according to the present invention in practical applications still belong to the protection scope of the present invention.

Example of preparation method

A patterned fluorescent film structure for white light LEDs and a preparation method thereof, the method comprising the following steps:

(1) Weigh several groups of phosphors and adhesives as raw materials and mix them uniformly at a mass ratio of 0.1 to 1:1. Put each group of raw materials in a plastic mixing cup and mix them evenly to form several groups of fluorescent glue mixtures. ;

(2) Vacuumize and defoam several groups of uniformly mixed fluorescent glue mixtures;

(3) Inject the several groups of fluorescent glue mixtures into different parts of the mold with a designed shape and a thickness of 0.1-1 cm, forming an alternate combination structure between different kinds of fluorescent glue mixtures;

(4) Put the fluorescent glue mixture together with the mold in an oven for curing, first bake at 60-90°C for 20-40 minutes, then transfer to 120-160°C for 20-40 minutes;

(5) After demoulding, a fluorescent film with a patterned structure for white light LEDs with a thickness of 0.1-1±0.05 mm can be obtained at one time.

The several groups of phosphors mentioned in the step (1) include at least one of YAG-based, LuAG-based, silicate, aluminate and other yellow or green phosphors, and nitride or fluoride red phosphors.

The adhesive in the step (1) is one or more of silica gel, epoxy resin, silicone material, and acrylic resin.

The shape of the mold in the step (3) is not limited, for example, it can be any desired shape such as a circle, a square, a rectangle, an ellipse, a rhombus, etc., wherein the two phosphors are distributed in an alternating combination of yellow and red or green and red. Alternate combination of red, the combination can be in any desired shape such as circular ring, square ring, fan, square, stripe, diagonal stripe, spiral fan, etc.

Preferably, the overall shape and size of the mold in the step (3), the shapes of different parts inside, the number of rings, blocks, sectors, stripes, etc. of different types of phosphors are not fixed. Personnel can design and change according to actual needs, as long as yellow or green fluorescent films and red fluorescent films are alternately combined.

The following embodiments will exemplarily provide several shapes of fluorescent thin film structures and combinations thereof.

Example 1

Figure 1 is a ring-shaped fluorescent film structure, the ring indicated by the label 1 is the yellow or green fluorescent film part, the ring indicated by the label 2 is the red fluorescent film part, and the yellow or green fluorescent film part is connected with the red fluorescent film. The thin film parts are alternately arranged and combined, the yellow or green fluorescent thin film part has 3 circles in total, and the red fluorescent thin film part has 2 circles in total, and the diameter of the outermost ring of the ring-shaped fluorescent thin film structure is 10 cm.

Example 2

Figures 2, 3, and 4 are circular fluorescent film structures. The area indicated by the label 1 is the yellow or green fluorescent film part, the area indicated by the label 1 is the red fluorescent film part, and the yellow or green fluorescent film part is connected with the red fluorescent film. The film sections are alternately arranged and combined.

Among them, Fig. 2 shows that the yellow or green fluorescent film part and the red fluorescent film part are half respectively, and Fig. 3 is 4 sectors divided on average, and the two kinds of fluorescent film parts each occupy 2 parts, and Fig. 4 is 8 sectors divided on average, The two kinds of fluorescent film parts respectively account for 4 parts, and the diameter of the circular fluorescent film structure is 10 cm.

Example 3

As shown in Figure 5, the structure of the spiral fan-shaped fluorescent film, the area indicated by the label 1 is the yellow or green fluorescent film part, and the area indicated by the label 2 is the red fluorescent film part, a total of 8 average spiral fan-shaped, two kinds of fluorescent film parts Each occupies 4 parts, alternately arranged and combined, and the diameter of the fluorescent film is 10cm.

Example 4

As shown in Figures 6 and 7, the square ring fluorescent film structure, the area indicated by the label 1 is the yellow or green fluorescent film part, the area indicated by the label 2 is the red fluorescent film part, Figure 6 is a square structure, and Figure 7 is a rectangular structure , a total of 5 mutually nested rings, the yellow or green fluorescent film part is 3 rings, and the red fluorescent film part is 2 rings, which are alternately arranged and combined. Among them, the length and width of the square fluorescent film structure are 10 cm, and the rectangular fluorescent film structure is It is 15cm and the width is 10cm.

Example 5

Figures 8 and 9 are strip-shaped fluorescent film structures. The area indicated by the label 1 is the yellow or green fluorescent film part, and the area indicated by the label 2 is the red fluorescent film part. Figure 8 is a square structure, and Figure 9 is a rectangular structure. , a total of 6 fluorescent film parts, including 3 yellow or green fluorescent film parts and 3 red fluorescent film parts, arranged alternately and combined. The length and width of the square fluorescent film structure are 10cm, and the length of the rectangular fluorescent film structure is 15cm. The width is 10cm.

In addition to the horizontal stripes shown in the figure, the stripes can also be vertical stripes.

Example 6

As shown in Figures 10 and 11, the oblique striped fluorescent film structure, the area indicated by the label 1 is the yellow or green fluorescent film part, the area indicated by the label 2 is the red fluorescent film part, the square structure in Figure 10, and the rectangular structure in Figure 11 , a total of 8 fluorescent film parts, including 4 yellow or green fluorescent film parts, and 4 red fluorescent film parts, arranged alternately and combined. The length and width of the square fluorescent film structure are 10cm, and the length of the rectangular fluorescent film structure is 15cm. The width is 10cm.

In addition to the structure inclined to the lower left corner shown in the figure, the structure of the fluorescent film may also be inclined to the lower right corner.

Example 7

Figures 12, 13, 14, and 15 are fluorescent film structures with block structures. The area indicated by the label 1 is the yellow or green fluorescent film part, and the area indicated by the label 2 is the red fluorescent film part. Figures 12 and 14 are square structures. , Figures 13 and 15 are rectangular structures. Figures 12 and 13 have a total of 4 pieces of fluorescent film parts, including 2 pieces of yellow or green fluorescent film parts and 2 pieces of red fluorescent film parts, which are arranged and combined alternately. Figures 14 and 15 have a total of 9 pieces. Among them, 5 pieces of yellow or green fluorescent film parts and 4 pieces of red fluorescent film parts are arranged and combined alternately. The length and width of the square fluorescent film structure are 10cm, and the length and width of the rectangular fluorescent film structure are 15cm and 10cm.

The patterned fluorescent thin film structure for white light LED of the present invention and its preparation method have the following advantages:

First. In the preparation method of the present invention, the raw materials used to prepare the patterned fluorescent film structure are still the raw materials used in the traditional dispensing method, and no other substances are added, which saves costs and reduces environmental pollution; and The obtained fluorescent film maintains the good optical properties of the phosphor;

Second. In the preparation method of the present invention, the use of fluorescent film to encapsulate the LED can solve the problems of phosphor powder precipitation in the traditional dispensing method, poor consistency of LED light and color, and unfavorable LED heat dissipation;

Third. The patterned fluorescent thin film structure of the present invention and its preparation method adopt the method of patterning, yellow or green phosphors and red phosphors are separated and combined alternately, which can not only improve the packaging of single yellow or green phosphors The problem of low color rendering index of LED can also solve the reabsorption effect of red phosphor on yellow phosphor or green phosphor caused by the traditional dispensing method or the mixing of two phosphors in general fluorescent film, resulting in the reduction of LED luminous efficiency And other issues;

Fourth. The patterned fluorescent film structure and its preparation method of the present invention adopts the fluorescent film encapsulation method, which saves the dispensing process in the traditional dispensing method, reduces the encapsulation process steps, and reduces the production cost of the factory.

The preferred embodiments of the invention disclosed above are only to help illustrate the invention. The preferred embodiments are not exhaustive in all detail, nor are the inventions limited to specific embodiments described. Obviously, many modifications and variations can be made based on the contents of this specification. This description selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The invention is to be limited only by the claims, along with their full scope and equivalents.

Claims (10)

1. a kind of white light LEDs preparation method of patterned fluorescent membrane structure, which is characterized in that this method includes mainly following Step：

(1) several groups fluorescent powder and adhesive are weighed respectively as raw material, and every group of fluorescent powder and adhesive are pressed 0.1~1:1 Mass ratio is uniformly mixed, and forms several groups fluorescent glue mixture；

(2) by fluorescent glue mixture vacuumizing and defoaming described in uniformly mixed several groups；

(3) it is in the mold of 0.1~1cm to be added into fluorescent glue mixture described in several groups respectively and preset the thickness of shape Different piece in, form different types of alternate composite structure of fluorescent glue mixture；

(4) fluorescent glue mixture described in several groups is heating and curing together with the mold；

(5) it demoulds, that is, obtains one-time formed white light LEDs patterned fluorescent membrane structure.

2. the white light LEDs as described in claim 1 preparation method of patterned fluorescent membrane structure, which is characterized in that described Step (4) be heating and curing for：20~40min is first toasted at 60~90 DEG C, then is transferred to 120~160 DEG C of 20~40min of baking.

3. the white light LEDs as described in claim 1 preparation method of patterned fluorescent membrane structure, which is characterized in that described Several groups fluorescent powder described in step (1), including red fluorescence powder further include yellow fluorescent powder or green emitting phosphor.

4. the white light LEDs as described in claim 1 preparation method of patterned fluorescent membrane structure, which is characterized in that described One or several kinds of the adhesive in silica gel, epoxy resin, silicone material, acrylic resin described in step (1).

5. the white light LEDs as described in claim 1 preparation method of patterned fluorescent membrane structure, which is characterized in that described The specific proportioning of fluorescent powder and adhesive in step (1) described in every group of fluorescent glue mixture can be according to the light of required LED Color parameter is regulated and controled.

6. the white light LEDs as described in claim 1 preparation method of patterned fluorescent membrane structure, which is characterized in that described Mold described in step (3), the material of mold can bear 180 DEG C or more of high temperature, and it is indeformable at high temperature do not decompose, table Face is smooth.

7. the white light LEDs as described in claim 1 preparation method of patterned fluorescent membrane structure, which is characterized in that described The thickness of white light LEDs patterned fluorescent membrane structure is in (0.1-1mm) ± 0.05mm.

8. a kind of patterned fluorescence membrane structure of white light LEDs, which is characterized in that multiple including multiple fluorescence membrane parts The fluorescence membrane part is combined as figure, and the setting structure of multiple fluorescence membrane parts is：Make containing not of the same race The fluorescence membrane part of fluorescent powder is arranged alternately.

9. the patterned fluorescence membrane structure of white light LEDs as claimed in claim 8, which is characterized in that the white light LEDs are used Patterned fluorescence membrane structure includes red fluorescence film portion made from multiple red fluorescence powders, further includes that multiple yellow are glimmering Green fluorescence film portion made from yellow fluorescence film portion made from light powder or multiple green emitting phosphors, the red fluorescence Film portion is to be arranged alternately with the yellow fluorescence film portion or the green fluorescence film portion.

10. the patterned fluorescence membrane structure of white light LEDs as claimed in claim 8, which is characterized in that the white light LEDs It is prepared using any preparation methods of claim 1-7 with patterned fluorescence membrane structure.