201025664 九、發明說明： 【發明所屬之技術領域】 . 本發明涉及一種螢光粉塗佈方法，特別係一種能對曲 .面分佈之光源模組進行螢光粉塗佈之方法。 【先前技術】 目前，發光二極體（Light Emitting Diode，LED)因具光 質佳（亦即光源述出之光譜）及發光效率高等特性而逐漸取 代冷陰極螢光燈（Cold Cathode Fluorescent Lamp，CCFL)作 ®為螢光粉塗佈方法之發光元件，具體可參見Michael S. Shur 等人於文獻 Proceedings of the IEEE，Vol. 93，No. 10 (2005 年 10 月）中發表之 “Solid-State Lighting: Toward Superior Illumination” 一文。 先前技術中發光二極體發出之白光，一般係由藍光發 光二極體晶粒發出藍光，部分藍光激發螢光粉所產生之黃 光，黃光與剩餘之部分藍光混合而成。混光效果主要由螢 @光粉之分佈均勻程度決定。由於摻雜於封裝體内之螢光粉 分佈不均勻，而使發出之白光帶有黃暈，效果較差。當然， 亦可採用成型技術（molding)將螢光粉塗佈於覆晶發光二 極體晶粒上，可有效地使螢光粉塗佈均勻。然而，成型技 術只適應於發光二極體晶粒呈平面分佈之情況，而不適應 於發光二極體晶粒呈曲面分佈。因此，發白光之發光二極 體模組之應用亦受到一定之限定。 有鑒於此，有必要提供一種能對曲面分佈之光源模組 進行螢光粉塗佈之方法。 6 201025664 【發明内容】 以下將以實施例說明一種能對曲面分佈之光源模組進 -行螢光粉塗佈之方法。 . 一種螢光粉塗佈方法，其包括：提供一個基底；於該 基底上形成一個具有親水性且溶於水之第一薄膜；將一個 具有親油性之第二薄膜塗佈於該第一薄膜上，該第二薄膜 中含有螢光粉；將形成有該第一薄膜以及第二薄膜之基底 ❹汉入水中，以使該第二薄膜漂浮於水面上；將光源模組與 該第二薄膜接觸，以使該第二薄膜附著於該光源模組上。 相對於先前技術’該螢光粉塗佈方法中第一薄膜具有 親水性，其具有良好之接著力與介面活性，第一薄膜溶於 水’從而使第二薄膜與基底脫離。由於該第二薄膜具有親 油性’因此，其可於水面上伸展形成一個均勻之薄膜。光 源模組與該第二薄膜接觸，即可將第二薄膜附著於該光源 模組上’從而使螢光粉均勻之塗佈於光源模組。由於該螢 ⑩光粉之塗佈方法藉由先將螢光粉形成一個薄膜，再將其薄 膜形成於光源模組上，因此，該螢光粉之塗佈方法屬於一 種轉印式塗佈方法，其適應於曲面分佈之光源模組。 【實施方式】 下面結合附圖對本發明作進一步之詳細說明。 請參見圖1’本發明實施例提供之螢光粉塗佈方法包括 以下步驟： 步驟一：提供一個基底10。於本實施例中，該基底10 為平板狀，其具有一個光滑平面。優選地，該基底為離 201025664 型紙（俗稱矽油紙，或者防黏紙）。可理解的是，該基底1〇 亦不限於平板狀’表面亦不限於光滑平面。 ' 步驟二：於該基底10上形成一個具有親水性且溶於水 -之第一薄膜11。於本實施例中，該第一薄膜n選用聚乙烯 醇（Polyvinyl Alcohol，PVA)。由於聚乙烯醇具有良好之造 膜性，其形成之膜具有優良之接著力與伸張強度。聚乙烯 醇具有親水性與疏水基兩種官能團，因此，聚乙烯醇具有 ❹介面活性之性質。優選地，第一薄膜n形成於該基底1〇 之光滑平面上。該第一薄膜層之厚度一般為3〇 8〇μιη。 步驟三：將一個具有親油性之第二薄膜12塗佈於該第 一薄膜11上’該第二薄膜12中含有螢光粉。具體地，選 用一種親油性物質，將螢光粉之混入該親油性物質。然後 將混有螢光粉之親油性物質塗佈於該第一薄膜η上，形成 一個第二薄膜12。可理解的是’螢光粉之含量以及螢光粉 與親油性物質之混合均勻度均可根據實際需要進行選擇。 ❸本實施例中，親油性物質選用聚氨酯（p〇ly Urethane，ρυ )。 由於聚截酯係種含有曱酸酯單元之高分子化合物，因此， 其不溶於非極性溶劑，能抗酸域與有機溶劑之腐蝕，且聚 氨酷之力學性能具有可調性。因此，聚氨酯可製得適應較 寬溫度範圍（一般為-50°C-150〇C )之產品。優選地，第二 薄膜12之厚度為5〇-250μπι。該第二薄膜12塗佈於該第一 薄膜11上所採用之方法可為喷塗、刷塗、報刷等。 步驟四：將形成有該第一薄膜U以及第二薄膜12之 基底10浸入水中’以使該第二薄膜12漂浮於水面上。具 201025664 體地，將形成有該第一薄膜11以及第二薄膜12.之基底1〇 浸入水溶液20中，由於第一薄膜11具有親水性且溶於水， 因此’該第一薄膜11即溶於水溶液2〇，該第二薄膜12從 該基底10上剝離並飄浮於水面上。優選地，水溶液2〇選 用純水。 步驟五·請參見圖2，將光源模組3〇與該第二薄膜 接觸，以使該第二薄膜12附著於該光源模組3〇上。於本 實施例中，該光源模組30包括複數個發光元件，其具有一 個出光面。該光源模組3G可為發光二極體晶片或發光二極 體。該光源模組30設置於一個支架31上，該支架31具有 個弧形表面311，該光源模組3〇設置於該支架31之弧形 表面311上。優選地，該支架31之弧形表面311上具有複 數個凹槽312。該複數個凹槽312與該光源模組3〇包括之 發光7°件間隔設置。將該光源模組3g與該第二薄膜 從而使該第二薄膜12附著於該光源模組30。藉 由凹槽311可排屮楚—域财 包覆之4，-第一相附著於該光源模組30時所 菩θ加該第二薄膜12於該光源模組30上之附 膜12接觸、僅將該光源模組3〇之出光面與該該第二薄 ΓΓ面 使該第二相12㈣於該光㈣組30之 慫一 行加熱’用以第二薄膜12之光源模組3〇進 膜U於該光_%3 :第―相12,以增強該第二薄 組30放人㈣爐巾 之㈣力。優選地，將該光源模 …、中加熱。一般將加熱之溫度控制於5〇_15〇 9 201025664 攝氏度’優選地，加熱溫度為1〇〇攝氏度。該光源模組 之加熱時間與加熱之溫度有關。-般當加熱溫度為100攝 氏度時’加熱時間為10分鐘左右。加熱完畢後，即可得到 •表面均勻塗佈有含有螢光粉之第二薄膜12之光源模組30。 本發明提供之螢光粉塗佈方法，由於採用親水性物質 作為第薄膜，並將螢光粉均句混入具有親油性之物質 中，且形成第二薄膜。因此，於水溶液中，第一薄膜溶水 ❹後，均勻混有螢光粉之親油性物質於水溶液中形成一個薄 膜層’從而可附著於光源模組，且可附著於曲面分佈之光 源模組。該方法步驟簡單、適用強。 紅上所述本發明確已符合發明專利之要件，遂依法 出專利中晴。惟’以上所述者僅為本發明之較佳實施方 ’自不⑨以此P艮制本案之巾請專利範圍。舉凡熟悉本案 技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 ❹【圖式簡單說明】 圖1係本發明實施例提供之榮光粉塗佈方法形成榮光 粉塗佈之結構示意圖。 _圖2係使用圖丄提供之榮光粉塗佈方法對光源模組進 行螢光粉塗佈之結構示意圖。 【主要元件符號說明】 10 11 基底 第一薄膜 光源模組 30 201025664 第二薄膜 12 水溶液 20 支架 31 弧形表面 311 凹槽 312201025664 IX. Description of the Invention: [Technical Field] The present invention relates to a method for coating a phosphor powder, and more particularly to a method for performing phosphor powder coating on a light source module having a curved surface distribution. [Prior Art] At present, the Light Emitting Diode (LED) is gradually replacing the Cold Cathode Fluorescent Lamp due to its excellent light quality (that is, the spectrum of the light source) and high luminous efficiency. CCFL) is a luminescent element for the phosphor coating method. For details, see Michael S. Shur et al., Proceedings of the IEEE, Vol. 93, No. 10 (October 2005). State Lighting: Toward Superior Illumination. In the prior art, white light emitted by a light-emitting diode generally emits blue light from a blue light-emitting diode crystal, a part of blue light excites yellow light generated by the fluorescent powder, and yellow light is mixed with the remaining partial blue light. The light mixing effect is mainly determined by the uniformity of the distribution of the fluorescent powder. Due to the uneven distribution of the phosphor powder doped in the package, the white light emitted is yellow, which is inferior. Of course, it is also possible to apply the phosphor powder to the crystal chip of the flip chip by using molding, which can effectively coat the phosphor powder uniformly. However, the forming technique is only suitable for the case where the crystal grains of the light-emitting diodes are distributed in a plane, and is not suitable for the curved surface distribution of the light-emitting diode grains. Therefore, the application of the white light emitting diode module is also limited. In view of the above, it is necessary to provide a method for performing phosphor powder coating on a light source module having a curved surface distribution. 6 201025664 SUMMARY OF THE INVENTION Hereinafter, a method for applying a fluorescent powder coating to a light source module having a curved surface distribution will be described by way of embodiments. A method of coating a phosphor powder, comprising: providing a substrate; forming a hydrophilic and water-soluble first film on the substrate; and coating a second film having lipophilicity on the first film The second film contains phosphor powder; the base film on which the first film and the second film are formed is placed in water to float the second film on the water surface; and the light source module and the second film are Contacting to attach the second film to the light source module. In contrast to the prior art, the first film of the phosphor coating method is hydrophilic, which has good adhesion and interface activity, and the first film is dissolved in water to detach the second film from the substrate. Since the second film is oleophilic, it can be stretched on the water surface to form a uniform film. The light source module is in contact with the second film, so that the second film can be attached to the light source module, so that the phosphor powder is uniformly applied to the light source module. Since the method for coating the fluorescent powder 10 is formed by first forming the fluorescent powder into a film and then forming the film on the light source module, the coating method of the fluorescent powder belongs to a transfer coating method. It is adapted to the light source module of the curved surface distribution. [Embodiment] The present invention will be further described in detail below with reference to the accompanying drawings. Referring to Fig. 1', the phosphor powder coating method provided by the embodiment of the present invention comprises the following steps: Step 1: A substrate 10 is provided. In the present embodiment, the substrate 10 is in the form of a flat plate having a smooth plane. Preferably, the substrate is from 201025664 type paper (commonly known as slick paper, or release paper). It is to be understood that the substrate 1 is also not limited to a flat surface and is not limited to a smooth plane. 'Step 2: Forming a first film 11 having hydrophilicity and being soluble in water on the substrate 10. In this embodiment, the first film n is made of polyvinyl alcohol (PVA). Since the polyvinyl alcohol has good film forming properties, the formed film has excellent adhesion and tensile strength. Polyvinyl alcohol has both hydrophilic and hydrophobic functional groups, and therefore, polyvinyl alcohol has the property of ❹ interface activity. Preferably, the first film n is formed on a smooth plane of the substrate 1〇. The thickness of the first film layer is generally 3 〇 8 〇 μιη. Step 3: Applying a lipophilic second film 12 to the first film 11 The second film 12 contains phosphor powder. Specifically, a lipophilic substance is selected and the phosphor powder is mixed into the lipophilic substance. Then, a lipophilic substance mixed with a fluorescent powder is applied onto the first film η to form a second film 12. It can be understood that the content of the phosphor powder and the mixing uniformity of the phosphor powder and the lipophilic substance can be selected according to actual needs. In the present embodiment, the lipophilic substance is selected from the group consisting of polyurethane (p〇ly Urethane, ρυ). Since the polyester ester type compound contains a polymer compound of a phthalate unit, it is insoluble in a non-polar solvent, and is resistant to corrosion by an acid domain and an organic solvent, and the mechanical properties of the polyurethane are adjustable. Therefore, polyurethane can be produced to accommodate a wide temperature range (typically -50 ° C - 150 ° C). Preferably, the second film 12 has a thickness of 5 Å to 250 μm. The method of applying the second film 12 to the first film 11 may be spraying, brushing, brushing or the like. Step 4: The substrate 10 on which the first film U and the second film 12 are formed is immersed in water ' to float the second film 12 on the water surface. With the 201025664 body, the substrate 1 on which the first film 11 and the second film 12 are formed is immersed in the aqueous solution 20, and since the first film 11 is hydrophilic and soluble in water, the first film 11 is dissolved. The second film 12 was peeled off from the substrate 10 and floated on the water surface in an aqueous solution. Preferably, the aqueous solution 2 is selected from pure water. Step 5: Referring to FIG. 2, the light source module 3 is in contact with the second film so that the second film 12 is attached to the light source module 3. In this embodiment, the light source module 30 includes a plurality of light emitting elements having a light exiting surface. The light source module 3G can be a light emitting diode chip or a light emitting diode. The light source module 30 is disposed on a bracket 31 having an arcuate surface 311. The light source module 3 is disposed on the curved surface 311 of the bracket 31. Preferably, the curved surface 311 of the bracket 31 has a plurality of grooves 312 thereon. The plurality of grooves 312 are spaced apart from the light source module 3A including the light-emitting elements by 7°. The light source module 3g and the second film are attached to the light source module 30. The groove 311 can be arranged to be covered by the surface of the light source module 30. When the first phase is attached to the light source module 30, the second film 12 is contacted by the film 12 on the light source module 30. And only the light emitting surface of the light source module 3 and the second thin surface enable the second phase 12 (four) to be heated in a row of the light (four) group 30 to "break into the light source module 3 of the second film 12" The film U is in the light_%3: the first phase 12 to enhance the (four) force of the second thin group 30 to release the (four) towel. Preferably, the light source is heated in the mold. The temperature of the heating is generally controlled to 5 〇 15 〇 9 201025664 ° C. Preferably, the heating temperature is 1 〇〇 Celsius. The heating time of the light source module is related to the heating temperature. - When the heating temperature is 100 degrees Celsius, the heating time is about 10 minutes. After the heating is completed, the light source module 30 having the second film 12 containing the phosphor powder uniformly coated on the surface can be obtained. In the phosphor powder coating method of the present invention, a hydrophilic substance is used as the first film, and the phosphor powder is mixed into the substance having lipophilicity to form a second film. Therefore, in the aqueous solution, after the first film is dissolved in water, the oleophilic substance uniformly mixed with the fluorescent powder forms a film layer in the aqueous solution, so that it can be attached to the light source module, and can be attached to the light source module of the curved surface distribution. . The method has simple steps and is applicable. The invention described above in the red has indeed met the requirements of the invention patent, and the patent is issued in accordance with the law. However, the above description is only the preferred embodiment of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the present invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of a glory coating method according to an embodiment of the present invention. _ Fig. 2 is a schematic view showing the structure of the luminescent powder coating of the light source module using the glare powder coating method provided by the figure. [Main component symbol description] 10 11 Substrate First film Light source module 30 201025664 Second film 12 Aqueous solution 20 Bracket 31 Curved surface 311 Groove 312
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