12519451251945
發明所屬之技術領域】 本發明係有關於一種白光發光二極體單元，更 種兼具發光效率及演色性之白光發光二極 、 先前技術】 + & 白光係為多顏色之混合光，可被人眼感覺為白光者，且 至：包括二種以上波長之混合光。例如，當人眼同時受红 、a、綠光的刺激時、或同時受到藍光與黃光的 均可感受為白光。因此，可依照此種原理，來製作一出 白光之半導體發光裝置。習知之白光半導體發 ; 造方式分述如下。 衣罝幻表 第一種方式係使用以磷化鋁鎵銦（A1 InGaP)、氮化銦 鎵（InGaN)與磷化鎵（GaP)為材質的三顆紅藍綠發光二極體 ，控制通過各發光二極體之電流，而使其分別發出紅、綠及 藍光。將此三顆發光二極體晶粒配置於同一個燈泡（丨) 中’並利用透鏡將二種顏色之光加以混合而產生白光。如 第一 A圖所示在基材1 〇上可以安置紅色發光二極體LR、綠 色發光二極體LG及藍色發光二極體LB,並在上面覆蓋封裝 膠體1 1以做保護用途。第一 B圖所示為此習知白光單元之 發光頻增，可看出紅色發光二極體L R、綠色發光二極體l g 及藍色發光二極體LB發射光譜中心分隔且並非寬廣分布。 由於白光是4 0 0 - 7 2 0 nm間連續分布之光譜形成，因此該習知 白光發光二極體色彩飽合度較低。雖然人類的眼睛可忽略 此現象而只看見白色光，但在一些精密度較高之光學偵檢 器的感測下，例如攝影機或相機等，其演色性（c ο 1 〇 rBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white light emitting diode unit, and a white light emitting diode having both luminous efficiency and color rendering property, and prior art] + & white light is a mixed light of multiple colors, It is perceived by the human eye as white light, and includes: mixed light of two or more wavelengths. For example, when the human eye is simultaneously stimulated by red, a, green light, or both blue and yellow, it can be perceived as white light. Therefore, a white light semiconductor light-emitting device can be fabricated in accordance with this principle. The conventional white light semiconductor is produced as follows. The first way is to use three red, blue and green light-emitting diodes made of aluminum gallium indium phosphide (A1 InGaP), indium gallium nitride (InGaN) and gallium phosphide (GaP). The current of each of the light-emitting diodes is such that they emit red, green and blue light, respectively. The three light-emitting diode crystal grains are disposed in the same bulb (丨) and the two colors of light are mixed by a lens to generate white light. As shown in Fig. A, a red light-emitting diode LR, a green light-emitting diode LG, and a blue light-emitting diode LB may be disposed on the substrate 1 and covered with the encapsulant 11 for protection. The first B diagram shows the illuminating frequency of the conventional white light unit. It can be seen that the red light emitting diode L R , the green light emitting diode l g and the blue light emitting diode LB have spectral center separations and are not broadly distributed. Since white light is a continuously distributed spectrum formed between 400-72 nm, the conventional white light emitting diode has a low color saturation. Although human eyes can ignore this phenomenon and only see white light, but under the sensing of some highly sophisticated optical detectors, such as cameras or cameras, their color rendering (c ο 1 〇 r
第6頁 1251945 五、發明說明（2) rendering property)在實質上仍偏低。再者當不同光色 發光二極體其中之一發生故障時，將無法得到正常的白光， 且總體而言，發光效率較差。 第二種方式為199 6年日本日亞化學（Nichia Chemical ·« )公司所發展出之技術，其係以氮化銦鎵藍光發光二極體配 合受激發可發出黃光之釔鋁石榴石型螢光粉，來製成一白 光光源。由於此種方式僅須使用一組發光二極體晶片，可 大幅地降低製造成本。參見第二圖，為此習知技術之示意 ^，在基材10上可以安置藍色發光二極體LB，並在上面覆蓋 百色勞光體PY，以吸收藍色發光二極體LB並發出黃光，並與 藍^混合成為白光。現今其所搭配之螢光粉調製技術已臻 成热’故已有商品呈現，然而此白光發光二極體演色性更 差。 【發明内容】 本發明之主要目的在於提供一種可兼具發光效率及演 技辦之白光發光二極體單元，以解決上述習知白光發光二 極體之缺點。 ·« 簟元i建成本發明之上述目的，本發明提供一種白光發光 美材·光發光二極體單元，包含一基材，例如可以為一絕緣 :糸至少一藍色發光二極體，位於基材上，且可以為氮化 ΐ Ϊ合物半導體所製成；一混合螢光體，包含紅色螢光 辦 色螢光體及黃色螢光體；並包覆於該藍色發光二極 髀矸3。該紅色榮光體可採用CaS:El^ SrS:Eu;黃色螢光 一 木用YAG:Ce*TbAG:ce;而綠色螢光體可採用SrGa2S4Page 6 1251945 V. Inventions (2) rendering property) is still substantially low. Furthermore, when one of the different light-emitting diodes fails, normal white light cannot be obtained, and overall, the luminous efficiency is poor. The second method is the technology developed by Japan's Nichia Chemical Co., Ltd. in 1996. It is an indium gallium nitride blue light-emitting diode that is excited to emit yellow light and yttrium aluminum garnet-type fluorescent light. Powder to make a white light source. Since this method only requires the use of a set of light-emitting diode chips, the manufacturing cost can be greatly reduced. Referring to the second figure, for the purpose of the prior art, a blue light-emitting diode LB may be disposed on the substrate 10, and the Baise labor body PY is covered thereon to absorb the blue light-emitting diode LB and emit Yellow light, and mixed with blue ^ to become white light. Nowadays, the phosphor powder modulation technology that it is equipped with has become a hot product, but this white light emitting diode has a poorer color rendering. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a white light emitting diode unit that can combine both luminous efficiency and performance to solve the above-mentioned shortcomings of the conventional white light emitting diode. The present invention provides a white light emitting material and a light emitting diode unit, comprising a substrate, for example, an insulating layer: at least one blue light emitting diode, located at a substrate, and may be made of a tantalum nitride composite semiconductor; a mixed phosphor comprising a red fluorescent phosphor and a yellow phosphor; and coated on the blue light emitting diode矸 3. The red glory body can adopt CaS: El^SrS:Eu; yellow fluorescent one wood YAG:Ce*TbAG:ce; and the green fluorescent body can adopt SrGa2S4
第7頁 1251945Page 7 1251945
:Eu或Ca8EuMnMg(Si〇4) 4C 12，以配合藍色發光 而混合出高演色性白光。 二極體之藍 光 步瞭解本發明之特徵及 之詳細說明與附圖，然而 非用來對本發明加以限 為了使貴審查委員能更進一 技術内容，請參閱以下有關本發明 所附圖式僅提供參考與說明用，並 制者。 【實施方式】 如第三圖所示，為依據本發明之較佳具體實例之一 白光發光二極體單元2之示意圖。該白光發光二極體單= 包含一基材20、位在基材20上之藍色發光二極體LB、及 在藍色發光二極體LB上之紅色螢光體PR及綠色螢光體 該紅色螢光體PR及綠色螢光體Pg可以吸收藍色發光二極妒 LB之藍光而分別發出紅光及綠光，並與藍色發光二極體_ 之藍光混合成白光。 上述說明之紅色及綠色螢光體中，該紅色螢光體可採 用CaS:Eu或SrS:Eu;而綠色螢光體可採用SrGa2S4:El^Ca8 EuMnMg(Si〇4) / 但是須知除了前述之螢光體外尚有其他 可用之螯光體，但並不代表本案發明只限用上述螢光體，亦 包括了其他可被藍光波長（400-490nm)範圍激發之螢光體 材料。 參見第四A圖，為依據本發明之另一較佳具體實例之白 光發光二極體單元2之示意圖。該白光發光二極體單元2包 S —基材2 0 (例如可以為一絕緣基材）、位在基材2 〇上之 藍色發光二極體LB (可以為氮化物系化合物半導體所製成:Eu or Ca8EuMnMg(Si〇4) 4C 12, mixed with high color rendering white light in combination with blue light. The blue light step of the diode understands the features of the present invention and the detailed description and the accompanying drawings, but is not intended to limit the present invention in order to enable the reviewing committee to further improve the technical content, please refer to the following description of the present invention only. Reference and explanation, and the system. [Embodiment] As shown in the third figure, it is a schematic diagram of a white light emitting diode unit 2 according to a preferred embodiment of the present invention. The white light emitting diode single body includes a substrate 20, a blue light emitting diode LB on the substrate 20, and a red phosphor PR and a green phosphor on the blue light emitting diode LB. The red phosphor PR and the green phosphor Pg can absorb the blue light of the blue light emitting diode LB to emit red light and green light, respectively, and mix with the blue light of the blue light emitting diode to form white light. In the red and green phosphors described above, the red phosphor may be CaS:Eu or SrS:Eu; and the green phosphor may be SrGa2S4:El^Ca8 EuMnMg(Si〇4) / However, besides the foregoing There are other useful chevrons in vitro, but it does not mean that the invention is limited to the above-mentioned phosphors, and other phosphor materials which can be excited by the blue wavelength (400-490 nm) range. Referring to Figure 4A, there is shown a schematic diagram of a white light emitting diode unit 2 in accordance with another preferred embodiment of the present invention. The white light emitting diode unit 2 includes an S-substrate 20 (for example, an insulating substrate) and a blue light-emitting diode LB (which may be made of a nitride-based compound semiconductor) on the substrate 2 to make
1251945 五、發明說明（4) )、及位在藍色發光二極體LB上之紅色、綠色及黃色混人 螢光體RGY，其中該混合螢光體RGY係包含紅色榮光體pR、" 綠色螢光體PG及黃色螢光體ΡΥ之混合結果。 一 在上述的白光發光二極體單元2中設有導線部份（未圖 不），可將藍色發光二極體LB之陰極及陽極連接到基材2〇的 電連接部份（未圖示），以將電力供應到藍色發光二極體lb 上。然而有關於藍色發光二極體LB之電極連接技術係為習 知技藝，並非本案重點，因此在此不在贅述。再者，上述圖 示之白光發光二極體單元為表面安裝型封裝但是須知^ 白光發光二極體單元亦可以為其他形式封裝:二燈^ 5 裝。 菖别述之藍光LED晶片LB精通電流而出射获多杏綠主 即可激發前述之混合螢光體RGY中的紅色螢光;:， 螢光體PG及黃色螢光體PY，並產生紅色I ^光及^ 光出射光線。 參見第四B圖，為本發明之較佳具體實例之白光發光二 極體單元2之發射光譜，由左至右分別為藍色發光二極體LB 之光譜、綠色螢光體PG之發射光譜、黃色螢光體ργ之發射 光譜與紅色螢光體PR之發射光譜，與習知技術之光譜（參 見第一 Β圖），本發明白光發光二極體單元2之發射光譜涵 括更廣闊的可見光波段，因此具有較佳之演色性。再者，因 為一般而言螢光體之發射光譜較發光二極體之發射光譜寬 廣，因此可以達成更佳之演色性。 因單純使用黃色光螢光體時其白色光之演色性不佳，1251945 V. Inventive Note (4)), and a red, green, and yellow mixed human phosphor RGY on the blue light-emitting diode LB, wherein the mixed phosphor RGY includes a red glory pR, " The result of mixing green PG and yellow phosphor ΡΥ. A wire portion (not shown) is disposed in the white light emitting diode unit 2, and the cathode and the anode of the blue light emitting diode LB are connected to the electrical connection portion of the substrate 2 (not shown). Show) to supply power to the blue LED lb. However, the electrode connection technique for the blue light-emitting diode LB is a conventional technique and is not the focus of the present invention, and therefore will not be described herein. Furthermore, the white light emitting diode unit shown above is a surface mount package, but it should be noted that the white light emitting diode unit can also be packaged in other forms: two lamps. The blue LED chip LB is proficient in current and is emitted by the multi-apricot green to excite the red fluorescent light in the aforementioned mixed phosphor RGY;:, the phosphor PG and the yellow phosphor PY, and generate a red I ^ Light and ^ light emit light. Referring to FIG. 4B, the emission spectrum of the white light emitting diode unit 2 of the preferred embodiment of the present invention is a spectrum of the blue light emitting diode LB and an emission spectrum of the green phosphor PG from left to right. The emission spectrum of the yellow phosphor ργ and the emission spectrum of the red phosphor PR, and the spectrum of the prior art (see the first diagram), the emission spectrum of the white light emitting diode unit 2 of the present invention encompasses a broader range It has a visible light band and therefore has better color rendering. Furthermore, since the emission spectrum of the phosphor is generally wider than that of the light-emitting diode, better color rendering can be achieved. The color rendering of white light is poor due to the simple use of yellow light phosphors.
1251945 五、發明說明（5) 因此在螢光膠中加入紅、綠色光螢光體以增加其演色性。 而，、工、頁、綠色螢光體依適當的比例混合作調配即可得 白光或調各種色溫、色光。 本發明之紅色、綠色及黃色混合之螢光體RGY中，該紅 色螢光體可採用CaS:El^ SrS:Eu;黃色螢光體可採用yaG :〇6或1^八0:〇6;而綠色螢光體可採用^(^284:£11或 CasEuMnMgCSiOJ^2。但是須知除了前述之螢光體外尚有 其他可用之螢光體，但並不代表本案發明只限用上述螢光 體，亦包括了其他可被藍光波長（4〇〇_49〇nm)範圍激發之螢 綜上所述，本發明之白光發光二極體單元，可兼具發光 色；/為一不可多得之發明發明產品，極具產業 予利：性、新穎性及進步性，完全符合發明專利申請要件， 羡依專利法提出申請敬請詳杏 aa ^ ^ ^ 姑 斤查並賜準本案專利，以保障發 明者之權盈。然以上所述，僅Λ太 .^ nn . ^ ^ _ 里马本發明之較佳實施例，凡依 本發明申清專利乾圍所做之均 明專利之涵蓋範圍。 w修飾與變化，皆應屬本發1251945 V. INSTRUCTIONS (5) Therefore, red and green phosphors are added to the phosphor to increase its color rendering. However, the work, page, and green phosphors can be blended in appropriate proportions to obtain white light or to adjust various color temperatures and shades. In the red, green and yellow mixed phosphor RGY of the present invention, the red phosphor may be CaS:El^SrS:Eu; the yellow phosphor may be yaG:〇6 or 1^8:6; The green phosphor can be used as ^(^284:£11 or CasEuMnMgCSiOJ^2. However, it should be noted that there are other phosphors available in addition to the above-mentioned phosphor, but it does not mean that the invention is limited to the above phosphors. Also included are other fluorescing elements that can be excited by the blue wavelength range (4 〇〇 _ 49 〇 nm). The white light emitting diode unit of the present invention can have both luminescent colors; Invented products, highly industrial benefits: sexuality, novelty and progressiveness, fully in line with the requirements of the invention patent application, according to the patent law, please apply for april aa ^ ^ ^ 斤 查 查 查 查 查 查 查 查 查 查 查 查However, as described above, only Λ太.^ nn . ^ ^ _ Rima is a preferred embodiment of the invention, and all patents covered by the invention are claimed. Modifications and changes should belong to this issue.
1251945 圖式簡單說明 圖示說明： 第一 A圖為一習知白光單元之示意圖。 第一 B圖為該習知白光單元之光譜圖。 第二圖為另一習知白光單元之示意圖。 第三圖為依據本發明之一較佳具體實例之示意圖。 第四A圖為依據本發明之另一較佳具體實例之示意圖 第四B圖為第四A圖元件之光譜圖。 元件符號說明： 習知】 10基材 LR紅色發光二極體 LB藍色發光二極體 PR紅色螢光體 本發明】 2 0基材 PY黃色螢光體 PG綠色螢光體 1 1封裝膠體 LG綠色發光二極體 PY黃色螢光體 PG綠色螢光體 LB藍色發光二極體 PR紅色螢光體 RGY混合螢光體1251945 Brief Description of the Drawings Illustration: The first A picture is a schematic diagram of a conventional white light unit. The first B is a spectrum of the conventional white light unit. The second figure is a schematic diagram of another conventional white light unit. The third figure is a schematic view of a preferred embodiment of the invention. Figure 4A is a schematic view of another preferred embodiment of the present invention. Figure 4B is a spectrum diagram of the fourth A-picture element. Description of the component symbols: Conventional] 10 substrate LR red light emitting diode LB blue light emitting diode PR red phosphor body invention] 20 0 substrate PY yellow phosphor PG green phosphor 1 1 package colloid LG Green Light Emitting PY Yellow Phosphor PG Green Light LB Blue Light Emitting Diode PR Red Fluorescent RGY Mixed Phosphor
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