200951202 九、發明説明： 【發明所屬之技術領域】 本發明係關於一種榮光膜。 【先前技術】 不論是照明裝置、電子裝置的光源或是背光模組，當 利用發光二極體（Light-Emitting Diode, LED)作為光源 時，通常會利用具有特定轉換波長之螢光體摻雜於LED的 Ο 封裝膠體内，以搭配不同發光波長的LED，例如黃色螢光 體搭配藍色LED，俾使發光二極體能發出白光。但由於螢 光體於封裝膠體中的分佈均勻性不易控制，因此，已有習 知技術以螢光膜（phosphor film )貼附於LED上來取代螢 光體摻雜於LED封裝膠體的態樣。 請參照圖1所示，一種習知技術之螢光膜1係具有一 膜材Π及一螢光體12,且螢光體12摻雜於膜材11中。 q 上述的螢光膜1可藉由一黏膠層而貼合於LED，因此，當 LED所發出的光線L入射至螢光膜1後，一部分光線L會 激發螢光體12，使螢光體12產生特定波長的光，另一部 分光線L則會直接穿透過螢光膜1。當螢光體12受激發後 < 產生之光線與直接穿透過螢光膜1之光線彼此混光後，即 - 可發出白光。 然而，習知之螢光膜1由於光線於膜材11内混光的 距離不足，使得通過螢光膜1的光線易產生混光不均的問 題。因此，如何設計一種能均勻混光的螢光膜，已成為重 200951202 要課題之一。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種能均勻混 光的螢光膜。 為達上述目的，依據本發明之一種螢光膜包含一螢光 體及一膜材。膜材具有複數空腔，螢光體係容置於至少一 空腔，空腔之容積大於螢光體之體積。 Ο θ 為達上述目的，依據本發明之另一種螢光膜包含一螢 光體及一膜材。膜材具有複數空腔，至少一空腔内係僅部 分設有螢光體。 承上所述，依據本發明之螢光膜係具有複數空腔，當 光線射入螢光膜内，碰到空腔會產生散射或全反射，藉此 可增加光線射出螢光膜前所經過的距離，以延長光線的混 光距離，使混光更為均勻。另外，由於螢光膜具有空腔， q 故可減少膜材所需的材料，進而降低材料成本。 【實施方式】 以下將參照相關圖式，說明依據本發明較佳實施例之 ^ 一種螢光膜，其中相同元件以相同標號表示。 - 請參照圖2所示，本發明之一種螢光膜2包含一膜材 21及一螢光體22。 膜材21的材質例如為一高分子聚合物。其中，高分 子聚合物包含聚i旨（polyester)、聚醚（poly ether)、聚丙 200951202 稀酸（polyacrylate)、聚複酸酯（polyarbonate，PC)、聚苯 乙稀（polystyrene，PS)、甲基丙烯酸甲S旨-苯乙烯 (methylmethacrylate- styrene, MMA-St )、聚曱基丙烯酸甲 酯（polymethylmethacrylate, PMMA)、聚對苯二曱酸乙二 酯（polyethylene terephthalate，PET)、石夕膠（silicone)、環 氧樹脂（epoxy )、聚酿胺（polyimide )、含氟聚合物 (fluoropolymer )、聚乙烯（polyethylene, PE )、聚丙烧 (polypropane, PP ) 、聚-3-甲基丁嫦 (poly-3-methylbutene )、聚-4-甲基戊稀-1 (poly-4-methylpentene-l )、聚丙烯(polypropylene ) ' 聚烯烴（poly olefin )、聚乙烯-t- 丁烧（poly vinyl-t-butane )、 聚乙烯基環己烧（polyvinylcyclohexane)、聚氟化苯乙烯 (polyfluorostyrene )、醋酸纖維素（cellulose acetate )、 丙酸纖維素（cellulose propionate )、聚三氟氯乙烯 (卩〇1>^111〇1'(^1^111〇1>(^1;11；/16116)或1，4-反式聚2,3-二曱基丁 二稀（l，4-transpoly-2,3-dimethylbutadiene )至少其中之一。 膜材21具有複數空腔211，該等空腔211係可於螢光 體22摻雜至膜材21後，藉由單軸（uniaxially )或雙轴延 伸（biaxially stretching)或者是滾壓的製程形成，然其非 限制性。當膜材21延展時，螢光體22的周圍則逐漸形成 空腔211，且至少部分空腔211會具有相同延伸方向D， 延伸方向D係與膜材21之一表面S平行。由於螢光膜2 具有空腔211，故可減少膜材21所需的材料，進而降低材 料成本。 200951202 螢光體22係容置於至少一空腔211，空腔211之容積 大於螢光體22之體積。或者，至少一空腔211内僅部分 設有螢光體22。於本實施例中’以螢光體22容置於複數 空腔211為例作說明，然其非限制性。需注意者，螢光體 22並非單指一顆螢光粉顆粒，也可為複數的螢光粉顆粒的 集合，故圖2中一部分的螢光體22為一顆螢光粉顆粒， 另一部分的螢光體22則以複數螢光粉顆粒來表示。 其中’螢光體22例如可為或包含無機粒子（inorganic particle)、有機粒子（organic particle)及其組合。無機粒 子例如為摻雜的石權石（doped garnet，如YAG:Ce和 (Y，Ga)AG:Ce)、銘酸鹽（aluminate，如 Sr2Al丨4 025:Eu 和 BAM:Eu)、石夕酸鹽（silicate，如銷摻雜石夕酸錄鋇(eUr〇pium doped strontium barium silicate))、硫化物（sulfide，如 ZnS:Ag、CaS:Eu 和 SrGa2S4:Eu )、氧硫化物（〇xy-sulfide )、 氧氮化物（oxy-nitride )、麟酸鹽（phosphate )、硼酸鹽 〇 ( borate )及鶴酸鹽（tungstate，如 CaW〇4 )等。另外， 無機粒子亦可為由半導體奈米材料，例如矽、鍺、硫化鎘 (CdS )、蹄化編（CdTe )、硫化辞（ZnS )、石西化辞（ZnSe )、 碲化辞（ZnTe)、硫化鉛（PbS)、硒化鉛（PbSe)、碲化鉛 (PbTe)、氮化銦（InN)、砷化銦（InAs)、氮化鋁（A1N)、 ' 磷化鋁（A1P)、砷化鋁（AlAs)、氮化鎵（GaN)、磷化鎵 (GaP)、砷化鎵（GaAs)及其組合所構成之量子點螢光體 (quantum dot phosphor) ° 又，螢光體22係具有單一種類螢光體或複數種類螢 200951202 光體，可受激發而發出相同或不相同波長的光線，其發光 波長可介於300奈米至750奈米之間。其中，螢光體22 於膜材21中的添加重量百分比約為1%〜60%。 另外，值得一提的是，藉由控制螢光體22於膜材中 的重量百分比，可控制膜材21中所佔有之空腔211的比 例，藉此可調整入射螢光膜2的光線穿透與反射的螢光膜 2的比率，以使螢光膜2成為一反射式螢光膜或一穿透式 螢光膜。 ® 再者，由於螢光膜2同時包含了折射率相異的膜材 21、空腔211以及螢光體22，因此，在相同的厚度下，本 發明的螢光膜2可比習知技術具有較佳的混光效果。或者 是，本發明的螢光膜2可具有較小的厚度（例如小於0.5 毫米），即可具有與習知技術相近的混光效果。 請參照圖3A所示，其為本發明之螢光膜2a另一變化 態樣。為了增加螢光膜2a的反射效果，螢光膜2a中可包 q 含有反射材料23，反射材料23之材質係可包含硫酸鋇 (BaS04)、二氧化鈦（1102)或三氧化二鋁（Al2〇3)。反 射材料23係可摻雜於膜材21或與螢光體22混合，於此， 以反射材料23摻雜於膜材21中為例作說明。摻雜有反射 材料23的螢光膜2a會比螢光膜2反射更多的入射光線。 請參照圖3B所示，其為本發明之螢光膜2b又一變化 態樣。螢光膜2b可包含一黏著層24及一硬塗層 (hard-coating layer) 25。黏著層24設置於膜材21之一 侧，硬塗層25相對於黏著層24設置於膜材21之另一側。 200951202 其中’黏著層24係用以使螢光膜2b可藉由黏貼方式與其 他兀件接合，而硬塗層25則用以避免螢光膜2b之表面s 受損。另外，螢光膜2b更可包含一離型層（rdease Hner -layer) 26，黏著層24設置於膜材21與離型層26之間， §欲將螢光膜2b黏合於其他元件上時，才將離型層26剝 除。藉由離型層26可避免黏著層24於未使用前，即因黏 著雜質而黏性降低，且可增加螢光膜2b使用上的便利性。 0 請參照圖3C所示，其為本發明之螢光膜2c再一變化 恶樣。螢光膜2c亦可包含有複數膜材21 a、21 b ,且各膜 材21a、21b亦具有複數空腔211a、211b，而螢光體22同 樣谷置於至少一空腔211a、211b。藉此，可更提高螢光膜 2c的螢光轉換效果。其中，需注意者，膜材21a、2lb的 數罝係非限制性，可依實際需求而有不同的層數。 請參照圖4所示，其為應用穿透式螢光膜2之發光裝 置3的示意圖。若螢光膜2為一穿透式螢光膜，其可設置 〇於發光裝置3之一封膠體31外側，且為避免螢光膜2損 傷，螢光膜2上亦可再用另一封膠體32做包覆。因此， 當發光二極體晶粒33射出之光線jl射入螢光膜2後，該 等空腔211可使光線L產生散射或全反射，、藉此可增加不 同波長之光線L的混光距離，使混光更為均勻。值得一提 的疋，螢光膜2的結構非限制性，亦可應用如圖3A至圖 3C之螢光膜2a、2b、2c，或其他變化態樣。 清參照圖5所示’其為應用穿透式螢光膜2之另一發 光裝置4的截面不意圖。螢光膜2亦可應用於如圖5之結 10 200951202 構的發光裝置4，發光裝置4包含一基板41、一透光殼體 42以及一發光二極體晶粒43。其中，基板41與透光殼體 42結合形成一容置空間0,容置空間0可充填或不充填流 體（例如有機溶劑或油）以進行散熱或光線折射，發光二 極體晶粒43設置於基板41且位於容置空間Ο中。螢光膜 2可設置於透光殼體42的外侧。因此，當發光二極體晶粒 42射出之光線L穿過透光殼體42射入螢光膜2後，該等 空腔211同樣可使光線L產生散射或全反射，藉此以增加 不同波長之光線L於螢光膜2的混光距離，使混光更為均 勻。值得一提的是，螢光膜2的結構非限制性，亦可應用 如圖3A至圖3C之螢光膜2a、2b、2c，或其他變化態樣。 綜上所述，依據本發明之螢光膜係具有複數空腔，當 光線射入螢光膜内，碰到空腔會產生散射或全反射，藉此 可增加光線射出螢光膜前所經過的距離，以延長光線的混 光距離，使混光更為均勻。且，由於螢光膜具有空腔，故 Q 可減少膜材所需的材料，進而降低整體成本。 又，藉由控制螢光體於膜材中的重量百分比，可控制 膜材中所具有之空腔的比例，藉此即可調整螢光.膜的光線 穿透與反射比率，將螢光膜區分為反射式螢光膜或穿透式 螢光膜，以增加螢光膜的應用範圍。 ' 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 11 200951202 【圖式簡單說明】 圖1為一種習知之螢光膜的示意圖； 圖2為本發明較佳實施例之螢光膜示意圖； . 圖3A至圖為本發明之螢光膜之複數變化態樣示意 圖； 圖4為應用本發明之螢光膜應用於一發光裝置的示意 圖；以及 圖5為應用本發明之螢光膜應用於另一發光裝置的示 意圖。 【主要元件符號說明】 1、2、2a〜2c :螢光膜 Π、21、21a、21b :膜材 12、22 :螢光體 211、211a、211b :空腔 〇 23 :反射材料 24 .黏著層 25:硬塗層 26 :離型層 '3、4 :發光裝置 '31、32 :封膠體 33、43 :發光二極體晶粒 41 :基板 42 :透光殼體 12 200951202 D :延伸方向 L :光線 .0 :容置空間 S :表面 〇 ❿ 13200951202 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a glory film. [Prior Art] Whether it is a lighting device, a light source of an electronic device, or a backlight module, when a light-emitting diode (LED) is used as a light source, phosphor doping with a specific conversion wavelength is usually used. In the LED package, the LEDs with different emission wavelengths, such as yellow phosphors and blue LEDs, enable the LED to emit white light. However, since the uniformity of distribution of the phosphor in the encapsulant is difficult to control, conventional techniques have been attached to the LED with a phosphor film instead of the phosphor doped with the LED encapsulant. Referring to Fig. 1, a fluorescent film 1 of the prior art has a film material and a phosphor 12, and the phosphor 12 is doped into the film 11. q The above fluorescent film 1 can be attached to the LED by an adhesive layer. Therefore, when the light L emitted from the LED is incident on the fluorescent film 1, a part of the light L excites the fluorescent body 12 to cause fluorescence. The body 12 produces light of a specific wavelength, and the other part of the light L passes directly through the fluorescent film 1. When the phosphor 12 is excited, < the generated light and the light directly penetrating the fluorescent film 1 are mixed with each other, that is, white light can be emitted. However, the conventional fluorescent film 1 is insufficient in the light-mixing distance in the film 11, so that the light passing through the fluorescent film 1 is liable to cause unevenness in light mixing. Therefore, how to design a fluorescent film that can uniformly mix light has become one of the major issues of 200951202. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a fluorescent film which can uniformly mix light. To achieve the above object, a fluorescent film according to the present invention comprises a phosphor and a film. The membrane has a plurality of cavities, and the fluorescent system is housed in at least one cavity, the volume of the cavity being larger than the volume of the phosphor. Ο θ For the above purpose, another fluorescent film according to the present invention comprises a phosphor and a film. The membrane has a plurality of cavities, and at least one of the cavities is only partially provided with a phosphor. According to the above aspect, the fluorescent film according to the present invention has a plurality of cavities. When light is incident on the fluorescent film, scattering or total reflection occurs in the cavity, thereby increasing the amount of light that passes before exiting the fluorescent film. The distance to extend the light mixing distance makes the light mixing more uniform. In addition, since the fluorescent film has a cavity, q can reduce the material required for the film, thereby reducing the material cost. [Embodiment] Hereinafter, a fluorescent film according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements are denoted by the same reference numerals. - Referring to Figure 2, a fluorescent film 2 of the present invention comprises a film 21 and a phosphor 22. The material of the film 21 is, for example, a high molecular polymer. Among them, the high molecular polymer includes polyester, polyether, polyacrylate 200951202 polyacrylate, polyarbonate (PC), polystyrene (PS), A Based on methylmethacrylate- styrene (MMA-St), polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), and Shiqi gum ( Silicone, epoxy, polyimide, fluoropolymer, polyethylene, PE, polypropane (PP), poly-3-methylbutyrate Poly-3-methylbutene), poly-4-methylpentene-1, polypropylene [poly olefin], polyethylene-t-butylene (poly vinyl) -t-butane ), polyvinylcyclohexane, polyfluorostyrene, cellulose acetate, cellulose propionate, polychlorotrifluoroethylene (卩〇) 1>^111〇1'(^1^111〇1>(^1; At least one of 11; /16116) or 1,4-transpoly-2,3-transbutadiene (membrane 21) has a plurality of cavities 211, The cavities 211 can be formed by a uniaxially or biaxially stretching or rolling process after the phosphor 22 is doped to the film 21, which is not limited. When the film 21 is stretched, the cavity 211 is gradually formed around the phosphor 22, and at least a part of the cavity 211 has the same extending direction D, and the extending direction D is parallel to one surface S of the film 21. Due to the fluorescent film 2 has a cavity 211, so that the material required for the film 21 can be reduced, thereby reducing the material cost. 200951202 The phosphor 22 is housed in at least one cavity 211, and the volume of the cavity 211 is larger than the volume of the phosphor 22. At least one cavity 211 is provided with only the phosphor 22 in part. In the present embodiment, the description is made by taking the phosphor 22 in the plurality of cavities 211 as an example, but it is not limited. It should be noted that the phosphor 22 does not refer to only one phosphor powder particle, but also a collection of a plurality of phosphor powder particles. Therefore, a part of the phosphor 22 in FIG. 2 is a phosphor powder particle, and the other part The phosphor 22 is represented by a plurality of phosphor particles. Wherein the phosphor 22 can be, for example, or comprise inorganic particles, organic particles, and combinations thereof. The inorganic particles are, for example, doped garnet (such as YAG:Ce and (Y,Ga)AG:Ce), alumate (such as Sr2Al丨4 025:Eu and BAM:Eu), Shi Xi Acid silicate (eUr〇pium doped strontium barium silicate), sulfide (such as ZnS:Ag, CaS:Eu and SrGa2S4:Eu), oxysulfide (〇xy) -sulfide ), oxy-nitride, phosphate, borate, and tungstate (such as CaW〇4). In addition, the inorganic particles may also be composed of semiconductor nanomaterials such as lanthanum, cerium, cadmium sulfide (CdS), hoof woven (CdTe), sulphide (ZnS), shisai (ZnSe), and ZnTe (ZnTe). Lead sulfide (PbS), lead selenide (PbSe), lead telluride (PbTe), indium nitride (InN), indium arsenide (InAs), aluminum nitride (A1N), 'aluminum phosphide (A1P), Quantum dot phosphor composed of aluminum arsenide (AlAs), gallium nitride (GaN), gallium phosphide (GaP), gallium arsenide (GaAs), and combinations thereof, and phosphor 22 It has a single type of phosphor or a plurality of types of firefly 200951202, which can be excited to emit light of the same or different wavelengths, and the light emission wavelength can be between 300 nm and 750 nm. The weight percentage of the phosphor 22 in the film 21 is about 1% to 60%. In addition, it is worth mentioning that by controlling the weight percentage of the phosphor 22 in the film, the proportion of the cavity 211 occupied in the film 21 can be controlled, thereby adjusting the light penetration of the incident fluorescent film 2. The ratio of the fluorescent film 2 to the reflection is made such that the fluorescent film 2 becomes a reflective fluorescent film or a transmissive fluorescent film. Further, since the fluorescent film 2 contains the film 21 having different refractive indexes, the cavity 211, and the phosphor 22, the fluorescent film 2 of the present invention can have a higher density than the conventional technology at the same thickness. A better light mixing effect. Alternatively, the fluorescent film 2 of the present invention may have a small thickness (e.g., less than 0.5 mm), that is, a light mixing effect similar to that of the prior art. Referring to Fig. 3A, it is another variation of the fluorescent film 2a of the present invention. In order to increase the reflection effect of the fluorescent film 2a, the fluorescent film 2a may include a reflective material 23, and the material of the reflective material 23 may include barium sulfate (BaS04), titanium dioxide (1102) or aluminum oxide (Al2〇3). ). The reflective material 23 may be doped or mixed with the phosphor 21, and the doping of the reflective material 23 in the film 21 will be described as an example. The fluorescent film 2a doped with the reflective material 23 reflects more incident light than the fluorescent film 2. Referring to Fig. 3B, it is still another modification of the fluorescent film 2b of the present invention. The fluorescent film 2b may include an adhesive layer 24 and a hard-coating layer 25. The adhesive layer 24 is disposed on one side of the film 21, and the hard coat layer 25 is disposed on the other side of the film 21 with respect to the adhesive layer 24. 200951202 wherein the adhesive layer 24 is used to bond the fluorescent film 2b to other components by adhesion, and the hard coat layer 25 is used to prevent the surface s of the fluorescent film 2b from being damaged. In addition, the fluorescent film 2b may further include a release layer (rdease Hner-layer) 26, and the adhesive layer 24 is disposed between the film 21 and the release layer 26, and § when the fluorescent film 2b is to be bonded to other components. The release layer 26 is stripped. By the release layer 26, the adhesive layer 24 can be prevented from being sticky before being used, i.e., due to adhesion of impurities, and the convenience of use of the fluorescent film 2b can be increased. Referring to Fig. 3C, it is a modification of the fluorescent film 2c of the present invention. The fluorescent film 2c may also include a plurality of film materials 21a, 21b, and each of the film materials 21a, 21b also has a plurality of cavities 211a, 211b, and the phosphors 22 are also placed in at least one of the cavities 211a, 211b. Thereby, the fluorescent conversion effect of the fluorescent film 2c can be further improved. Among them, it should be noted that the number of the membranes 21a and 2lb is not limited, and may have different number of layers depending on actual needs. Referring to Fig. 4, it is a schematic view of a light-emitting device 3 to which a transmissive fluorescent film 2 is applied. If the fluorescent film 2 is a transmissive fluorescent film, it can be disposed outside the gel 31 of the light-emitting device 3, and in order to avoid damage of the fluorescent film 2, another film can be used on the fluorescent film 2. The colloid 32 is coated. Therefore, when the light beam j1 emitted from the light-emitting diode crystal grains 33 is incident on the fluorescent film 2, the cavity 211 can scatter or totally reflect the light L, thereby increasing the light mixing of the light beams L of different wavelengths. The distance makes the light mixing more uniform. It is worth mentioning that the structure of the fluorescent film 2 is not limited, and the fluorescent films 2a, 2b, 2c as shown in Figs. 3A to 3C, or other variations may be applied. Referring to Fig. 5, it is a cross-sectional view of another light-emitting device 4 to which the transmissive fluorescent film 2 is applied. The fluorescent film 2 can also be applied to the light-emitting device 4 constructed as shown in Fig. 5, which has a substrate 41, a light-transmissive casing 42 and a light-emitting diode die 43. The substrate 41 is combined with the transparent housing 42 to form an accommodating space 0. The accommodating space 0 can be filled or not filled with a fluid (for example, an organic solvent or oil) for heat dissipation or light refraction, and the illuminating diode die 43 is disposed. The substrate 41 is located in the accommodating space Ο. The fluorescent film 2 can be disposed outside the light-transmitting casing 42. Therefore, when the light L emitted from the LED die 42 is incident on the fluorescent film 2 through the light-transmitting casing 42, the cavity 211 can also scatter or totally reflect the light L, thereby increasing the difference. The light beam of the wavelength L is at a light mixing distance of the fluorescent film 2 to make the light mixing more uniform. It is to be noted that the structure of the fluorescent film 2 is not limited, and the fluorescent films 2a, 2b, 2c as shown in Figs. 3A to 3C, or other variations may be applied. In summary, the fluorescent film according to the present invention has a plurality of cavities. When light is incident on the fluorescent film, scattering or total reflection occurs when it hits the cavity, thereby increasing the amount of light that passes before exiting the fluorescent film. The distance to extend the light mixing distance makes the light mixing more uniform. Moreover, since the fluorescent film has a cavity, Q can reduce the material required for the film, thereby reducing the overall cost. Moreover, by controlling the weight percentage of the phosphor in the film, the proportion of the cavity in the film can be controlled, thereby adjusting the light transmittance and reflection ratio of the fluorescent film, and the fluorescent film It is divided into a reflective fluorescent film or a transmissive fluorescent film to increase the application range of the fluorescent film. The above description is for illustrative purposes only and not as a limitation. Any equivalent modifications or alterations to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional fluorescent film; FIG. 2 is a schematic view of a fluorescent film according to a preferred embodiment of the present invention; FIG. 3A to FIG. FIG. 4 is a schematic view showing the application of the fluorescent film of the present invention to a light-emitting device; and FIG. 5 is a schematic view showing the application of the fluorescent film of the present invention to another light-emitting device. [Explanation of main component symbols] 1, 2, 2a to 2c: fluorescent film Π, 21, 21a, 21b: film 12, 22: phosphor 211, 211a, 211b: cavity 〇 23: reflective material 24. Adhesive Layer 25: Hard coat layer 26: Release layer '3, 4: Light-emitting device '31, 32: Sealant 33, 43: Light-emitting diode die 41: Substrate 42: Light-transmitting case 12 200951202 D: Extension direction L : light .0 : accommodation space S : surface 〇❿ 13