CN103280509A - Powder coating method and method using same for coating LED (light emitting diode) fluorescent powder - Google Patents
Powder coating method and method using same for coating LED (light emitting diode) fluorescent powder Download PDFInfo
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- CN103280509A CN103280509A CN2013101989897A CN201310198989A CN103280509A CN 103280509 A CN103280509 A CN 103280509A CN 2013101989897 A CN2013101989897 A CN 2013101989897A CN 201310198989 A CN201310198989 A CN 201310198989A CN 103280509 A CN103280509 A CN 103280509A
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Abstract
The invention relates to a powder coating method and a method using the same for coating LED (light emitting diode) fluorescent powder. The powder coating method comprises the steps of 1, coating a binder on a base material; 2, contacting the base material coated with the binder with suspended powder to adsorb the powder; 3, pre-curing the powder on the base material obtained in the step 2, and then removing redundant powder on the face of the base material; and step 4, curing the powder on the face of the base material on the base material to obtain the product. The method for coating the LED fluorescent powder is capable of uniformly distributing the fluorescent powder on the base material and is lower in cost.
Description
Technical field
The present invention relates to a kind of spraying method, particularly a kind of powder painting method.The invention still further relates to and use this powder painting method to carry out the method that LED fluorescent material applies.
Background technology
The LED lamp is light-emitting diode, is a kind of solid-state semiconductor device that electric energy directly can be changed into visible light.Compare with traditional incandescent lamp, that the LED light fixture has is energy-conservation, the life-span is long, applicability good, environmental protection, advantage such as lucuriant in design, thereby uses more and more widely in fields such as daily life, decoration.
The light that sends of LED lamp is white, and this is that the blue light that sent by LED crystal particle is compound and form with the gold-tinted of blue-light excited fluorescent material generation, so the mixed light effect depends on the degree that is evenly distributed of fluorescent material.Traditional fluorescent material coating method is some glue mode: at first fluorescent material is mixed mutually with silica gel, adopt the mode of drop that it is coated on the led chip of emission blue light then.When a glue was inhomogeneous, aberration appearred in the light that will cause the LED lamp to send, and the cost of this some glue mode is also higher.In addition, because the ratio of fluorescent material is great, be difficult to guarantee the even distribution of fluorescent material on base material for non-planar substrates, and aberration appears in the light that causes the LED lamp to send.Therefore, be badly in need of a kind ofly improving fluorescent material distribution situation on base material, and lower-cost method.
Summary of the invention
At existing above-mentioned technical problem in the prior art, the present invention proposes a kind of powder painting method, it can make powder be evenly distributed on the base material, and the cost of this method is lower.The invention still further relates to make and carry out the method that LED fluorescent material applies in this way.
According to a first aspect of the invention, proposed a kind of powder painting method, may further comprise the steps:
Step 1: coated with adhesive on base material;
Step 2: the base material that will scribble binding agent contacts with the powder of suspension and adsorbs powder;
Step 3: the powder on the base material that will obtain in step 2 carries out precuring, then powder unnecessary on the substrate surface is removed;
Step 4: the powder of substrate surface is solidified on base material, obtain product.
By method of the present invention, the base material that scribbles binding agent is contacted with the powder of suspension, the various piece of base material all can contact with powder and adsorb powder, thus the coating that realizes powder is not limited by the base material shape.In addition, powder removal unnecessary on the substrate surface can be saved powder, reduce cost, can also prevent that the powder on the base material from too much influencing the quality of final products.
In one embodiment, in step 2, by spraying the powder that powder forms described suspension.This method can come effectively to control the needed time of coating procedure as required, and powder can be disperseed equably, in another embodiment, in step 2, leaks by sieve and to form the powder that suspends.By using the sieve of different size, can control the granularity of powder, help to form high-quality coating.
In one embodiment, in step 3, remove unnecessary powder by wind.This method can be removed the not powder of firm engagement of substrate surface easily, helps to form firm coating at substrate surface.In addition, this method is easy to operate and control, and can not introduce environmental contaminants, also helps to form high-quality coating.
In one embodiment, after step 1, repeat step 2 and step 3, the bisque of required thickness up to reaching.
According to a second aspect of the invention, proposed the method that a kind of LED fluorescent material applies, it comprises powder painting method mentioned above, and fluorescent material forms suspension in the sample room.In one embodiment, employed base material is the naked crystalline substance of LED.
In one embodiment, having adopted specification is that 5000 purposes, first screen cloth disperses fluorescent material in the sample room.Use average grain diameter that this screen cloth guaranteed finally to enter the fluorescent material in the sample room in very little scope, can form high-quality phosphor powder layer.In a preferred embodiment, other bigger screen clothes of mesh size also are set above first screen cloth.The mode that this sieve step by step leaks can prevent effectively that the bigger fluorescent material of granularity from blocking the mesh of first screen cloth, helps carrying out continuously of coating procedure.
In one embodiment, the concentration of fluorescent material in the sample room is at 0.2-0.5g/m
3Under this concentration, nearly all fluorescent material all has been firmly adhered on the base material, thereby has improved the utilance of fluorescent material.In another embodiment, fluorescent material is at the Reynolds number R of sample indoor sport
xLess than 500.Under this condition, fluorescent material can be attached on the base material equably, makes that the fluorescent material on the base material is more even, has improved the quality of phosphor powder layer.
In one embodiment, fluorescent material is every t
1Time is transported to the sample room, and base material stops t in the sample room
2Time, wherein, t
1Time: t
2Time=0.8-1: 2-3.The concentration of the fluorescent material in the sample room can be remained in the metastable scope like this.
In one embodiment, the speed of removing the unnecessary fluorescent material wind on the base material be 0.5-2 rice/minute.Homogenizing and the thinning of phosphor powder layer have been realized like this.The unnecessary fluorescent material of removing can re-use, thereby has improved the utilance of fluorescent material, with cost.
Compared with prior art, the invention has the advantages that, by in the sample room, forming suspension fluorescent material, can form uniform phosphor powder layer at base material, avoided fluorescent material of the prior art skewness and aberration appears in the light that causes the LED lamp to send on base material.The present invention has also used screen cloth to form suspension fluorescent material in the sample room, makes that the fineness ratio of the fluorescent material in the phosphor powder layer is more even, and this also helps to form uniform phosphor powder layer.In addition, remove unnecessary fluorescent material on the base material by wind, can form ultra-thin phosphor powder layer, thereby can increase luminous flux and improve light efficiency, improve the consistency of LED thermal diffusivity and colour temperature, can also reduce the consumption of fluorescent material, reduce production costs.
Description of drawings
To and come with reference to the accompanying drawings the present invention is described in more detail based on embodiment hereinafter.Wherein:
Fig. 1 is the schematic flow sheet of the method according to this invention.
In the drawings, identical member is indicated by identical Reference numeral.Accompanying drawing is not according to the scale of reality.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Fig. 1 has schematically shown flow process Figure 10 of the method according to this invention.Below with carry out LED fluorescent material be applied to the example method of the present invention is described.
As described in Figure 1, method of the present invention comprises with lower unit or equipment: the storage powder for powder center 11, sample room 12 and be used for solidifying the baking oven 13 of powder.In order in one embodiment, also to include the spray gun (not shown) for powder center 11 with fluorescent material from for sending the powder center 11.Above equipment all is that those skilled in the art is known, for simplicity, no longer relates here.
At first with adhesive coated to LED naked brilliant 15.In one embodiment, employed binding agent comprises with mass ratio being silica gel DE-6550A and the DE-6550B of the DOW CORNING that mixes at 1: 1, also to wherein having added dicarboxylic acid esters DBE, and with the viscosity control of binding agent at 100-120mpas.In order to realize that mass applies, in one embodiment, can use spray gun that binding agent is sprayed onto on the LED naked brilliant 15, can also make the distribution of the binding agent on the naked crystalline substance of LED more even like this.Afterwards, adsorb fluorescent material with preparation in the sample room 12 that the LED that is coated with binding agent naked brilliant 15 is placed among Fig. 1.
To supplying to fill fluorescent material in the powder center 11.In the present embodiment, adopted the yellow fluorescent powder of the special YAG-04 of Great Britain and America, its average grain diameter is 13 μ m.Start spray gun, fluorescent material is injected to the inner and upper of sample room 12.12 internal freedom falls to forming suspension fluorescent material in the sample room, makes the naked crystalline substance of LED can adsorb fluorescent material equably, and can not produce problem pockety.More even for fluorescent material is distributed in sample room 12, in one embodiment, the Reynolds number R that fluorescent material is moved in sample room 12
xBe controlled to be less than 500, the concentration of fluorescent material in sample room 12 is at 0.2-0.5g/m in addition
3
Because the granularity of fluorescent material is more little, its specific area is just more big, and is just more strong in the lip-deep adsorption capacity of the LED that scribbles binding agent naked brilliant 15.In the present embodiment, 12 inside is provided with multilevel screen 14 from top to bottom in the sample room, for example the specification of screen cloth from the top down proportion by subtraction be 800 orders, 1000 orders, 2000 orders, 5000 orders.Naked brilliant 15 of LED is placed on the below that specification is 5000 purposes, first screen cloth.Under the drive of motor (not shown), these screen clothes shake with certain frequency, make and to fall fluorescent material on the screen cloth that specification is the top layer of 800 purposes step by step to falling to forming suspension, after leaking through multilevel screen sieve in addition, finally can with the average grain diameter of naked brilliant 15 fluorescent material that contact of LED about 2.6 μ m.Should be, the specification of screen cloth as described herein only be exemplarily with understanding, and those skilled in the art can select the screen cloth of other specifications as required.When the granularity of selected fluorescent material is in desired scope, can also not use these screen clothes.
After applying end, the phosphor powder layer on the LED naked brilliant 15 is sent into precuring chamber 18 carry out precuring.In the present embodiment, use infrared heating to carry out precuring.Afterwards, operating speed be 0.5-2 rice/minute wind remove unnecessary fluorescent material on the LED naked brilliant 15.In this application, after term " unnecessary fluorescent material " refers to precuring, there is not the fluorescent material of firm attachment on LED naked brilliant 15.Do homogenizing and the thinning that can reach phosphor powder layer like this, this can improve the optical property of packaged LED.In one embodiment, when using wind, also LED naked brilliant 15 is rotated, thereby the unnecessary fluorescent material on naked brilliant 15 various pieces of LED can both obtain removing.After this, for the thickness that makes the phosphor powder layer on the LED naked brilliant 15 reaches desired thickness, can again LED naked brilliant 15 be turned back to and adsorb fluorescent material in the sample room 12 again.In one embodiment, the fluorescent material that is not adsorbed in the fluorescent material that blows off and the sample room 12 can also be delivered in the cyclone separator 17 and reclaimed, the fluorescent material after the recovery can return for reusing to reduce production costs in the powder center 11.
In order to guarantee that the fluorescent material concentration that LED naked brilliant 15 touches remains in the stable scope in sample room 12, feed fluorescent material to the sample room in 12 with batch (-type) for powder center 11, and should off time and the time of staying of LED naked brilliant 15 in sample room 12 be complementary.In one embodiment, fluorescent material is every t
1Time is transported to the sample room, and LED naked brilliant 15 stops t in sample room 12
2Time, wherein, t
1Time: t
2Time=0.8-1: 2-3.
After the thickness of phosphor powder layer reaches required value, the LED naked brilliant 15 of the fluorescent material that is coated with is transplanted on baking oven 13 by conveyer belt 16 is cured, encapsulates and obtain product.Thickness through the test phosphor powder layer is 3 μ m.Then its optical property is tested, table 1 has shown prepared according to the methods of the invention product 20 and comparison according to the optical property of the product 30 of prior art for preparing.
Table 1
Can be seen that by table 1 the obvious beguine of the optical property of prepared according to the methods of the invention product 20 is according to the good in optical property of the product 30 of prior art for preparing, particularly the light decay of product 20 is than reducing significantly, and colour temperature also slightly reduces.In addition, luminous flux and light efficiency then have raising to a certain extent.
Though invention has been described with reference to preferred embodiment, without departing from the scope of the invention, can carry out various improvement and can replace wherein parts with equivalent it.Especially, only otherwise have structural hazard, every technical characterictic of mentioning among each embodiment all can combine in any way.The present invention is not limited to disclosed specific embodiment in the literary composition, but comprises all technical schemes in the scope that falls into claim.
Claims (12)
1. powder painting method may further comprise the steps:
Step 1: coated with adhesive on base material;
Step 2: the described base material that scribbles binding agent is contacted with the powder of suspension and adsorb described powder;
Step 3: the powder on the base material that will obtain in step 2 carries out precuring, then powder unnecessary on the substrate surface is removed;
Step 4: the powder of substrate surface is solidified on described base material, obtain product.
2. method according to claim 1 is characterized in that, in described step 2, by spraying the powder that powder forms described suspension.
3. method according to claim 1 is characterized in that, in described step 2, in described step 2, leaks the powder that forms described suspension by sieve.
4. according to each described method in the claim 1 to 3, it is characterized in that, in described step 3, remove unnecessary powder by wind.
5. according to each described method in the claim 1 to 4, it is characterized in that, after described step 1, repeat step 2 and step 3, the bisque of required thickness up to reaching.
6. the method that LED fluorescent material applies is characterized in that, comprise according to each described powder painting method in the claim 1 to 5, and described fluorescent material forms suspension in the sample room.
7. method according to claim 6 is characterized in that, having adopted specification is that 5000 purposes, first screen cloth disperses described fluorescent material in described sample room.
8. method according to claim 7 is characterized in that, other bigger screen clothes of mesh size also are set above described first screen cloth.
9. according to each described method in the claim 6 to 8, it is characterized in that described fluorescent material is every t
1Time is transported to described sample room, and described base material stops t in described sample room
2Time, wherein, t
1Time: t
2Time=0.8-1: 2-3.
10. according to each described method in the claim 6 to 9, it is characterized in that the concentration of described fluorescent material in described sample room is at 0.2-0.5g/m
3
11., it is characterized in that described fluorescent material is at the Reynolds number R of sample indoor sport according to each described method in the claim 6 to 10
xLess than 500.
12. according to each described method in the claim 6 to 11, it is characterized in that, described speed of removing the unnecessary fluorescent material wind on the base material be 0.5-2 rice/minute.
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| CN2013101989897A CN103280509A (en) | 2013-05-24 | 2013-05-24 | Powder coating method and method using same for coating LED (light emitting diode) fluorescent powder |
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|---|---|---|---|
| CN2013101989897A CN103280509A (en) | 2013-05-24 | 2013-05-24 | Powder coating method and method using same for coating LED (light emitting diode) fluorescent powder |
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Citations (7)
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| US5674554A (en) * | 1996-01-22 | 1997-10-07 | Industrial Technology Research Institute | Method for forming a phosphor layer |
| US20050224830A1 (en) * | 2004-04-09 | 2005-10-13 | Blonder Greg E | Illumination devices comprising white light emitting diodes and diode arrays and method and apparatus for making them |
| CN101460661A (en) * | 2006-06-07 | 2009-06-17 | 奥斯兰姆奥普托半导体有限责任公司 | Method for arranging a powder layer on a substrate and a layer structure with at least one powder layer on a substrate |
| US20100155763A1 (en) * | 2008-01-15 | 2010-06-24 | Cree, Inc. | Systems and methods for application of optical materials to optical elements |
| CN101847682A (en) * | 2009-12-21 | 2010-09-29 | 深圳市成光兴实业发展有限公司 | White light LED fluorescent powder film layer manufactured by adopting powder sedimentation technology and manufacture method |
| CN102272953A (en) * | 2008-11-13 | 2011-12-07 | 行家光电有限公司 | Phosphor-coated light extraction structures for phosphor-converted light emitting devices |
| CN102945915A (en) * | 2012-10-22 | 2013-02-27 | 厦门多彩光电子科技有限公司 | Coating technique of LED fluorescent powder |
-
2013
- 2013-05-24 CN CN2013101989897A patent/CN103280509A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5674554A (en) * | 1996-01-22 | 1997-10-07 | Industrial Technology Research Institute | Method for forming a phosphor layer |
| US20050224830A1 (en) * | 2004-04-09 | 2005-10-13 | Blonder Greg E | Illumination devices comprising white light emitting diodes and diode arrays and method and apparatus for making them |
| CN101460661A (en) * | 2006-06-07 | 2009-06-17 | 奥斯兰姆奥普托半导体有限责任公司 | Method for arranging a powder layer on a substrate and a layer structure with at least one powder layer on a substrate |
| US20100155763A1 (en) * | 2008-01-15 | 2010-06-24 | Cree, Inc. | Systems and methods for application of optical materials to optical elements |
| CN102272953A (en) * | 2008-11-13 | 2011-12-07 | 行家光电有限公司 | Phosphor-coated light extraction structures for phosphor-converted light emitting devices |
| CN101847682A (en) * | 2009-12-21 | 2010-09-29 | 深圳市成光兴实业发展有限公司 | White light LED fluorescent powder film layer manufactured by adopting powder sedimentation technology and manufacture method |
| CN102945915A (en) * | 2012-10-22 | 2013-02-27 | 厦门多彩光电子科技有限公司 | Coating technique of LED fluorescent powder |
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Application publication date: 20130904 |