200913000 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種發光裝置’尤指一種利用從冷陰極 電子發射源場發射的電子而使發光體（螢光體）受激發光， 由此產生白光的發光裝置。 【先前技術】 近年來，相對於白熾燈或螢光燈這樣的現有發光裝置， 已開發出冷陰極場發射型的發光裝置，其通過在真空中， 使從冷陰極電子發射源場發射的電子高速與發光體（螢光 體）碰撞，而使發光體受激發光，具有作爲場發射型照明 燈（Fie丨d Emissi〇n Lamp: FEL)或場發射型顯示裝置（BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-emitting device, particularly to an illuminant (phosphor) that is excited by light emitted from a cold cathode electron emission source field. A light-emitting device that produces white light. [Prior Art] In recent years, a cold cathode field emission type light-emitting device has been developed with respect to an existing light-emitting device such as an incandescent lamp or a fluorescent lamp, which emits electrons from a cold cathode electron emission source field in a vacuum. The high-speed collision with the illuminant (fluorescent body) causes the illuminant to be excited, and has a field emission type illuminating lamp (Fie丨d Emissi〇n Lamp: FEL) or a field emission type display device (
Emission Display: FED)的用途。 % 在这些發光裝置中，纟fed的製造程序中，通常多採 用對應於像素大小等的微米級的各種顯微處理。例如，在 FED製造n利❹射法或CVD法等用於半導體曰 片等的習知的顯微處理，在玻璃或陶£類等的絕緣性基板 上形成陰極（負極）。另外，通過在絕緣性基板上直接、或 通過與形成在絕緣性基板表面上 _料’並將開設有多個直徑爲10"至：：柱狀 的板厚爲⑽瑪m的全屬薄板固”10一的開口部 上，從而形相極。R屬歧^在餘《融材料 另一方面， 對負極等實施如 對於專門用於燈用光源等的FEL，不需要 FED那樣的微米級的微細加工，對於間極 200913000 上開认的開口邛，其直徑爲毫米級的較大的直徑即可（例 如’參照專利文獻特開2006— 339〇12號公報）。因此在 FEL製造中，通過取消設備需要大量費用等的顯微處理， 將僅通過域環境的處料可大量生産的料喊而製造 出最終的各種功能部件’則可實現大幅度的成本降低。例 士可以通過由以板厚爲零點幾毫米程度的金屬板作爲其 材的單獨的功能部件分別構成負極及閘極，並將它們安裝 在真空容器内，而低價地製造FEL。 【發明内容】 此外，故種FEL在作爲各種照明用的光源使用等的多 數情况下，要求其發出白光。 i 但是’如在螢光管中廣泛使用的發光體等所示，對於 =外殘激發發出白光的發光體來…開發出大量高 ㈣缝，但對於利用電子激發發出白光的發光 目月㈣沒有開發出以足够高的亮度發光的發光 體。 在FEL中，例如，在將受激發發出白光的發光 辦Γ，Γ極而獲得白光的情况下，發光體層的能量損耗 曰’可能難以高效地産生高亮度的白光。 發光ί:明是鑒於上述情况提出的，#目的在於提供-種 、、’其可高效地産生高亮度的白光。 2成前述目的所採取之主要技術手段係令前述發光 特徵在於，該發光裝置在真空容器内設有：負極， 200913000 其表面上形成有冷陰極電子發射源；以及 正極’其在與前述負極相對的表面上形成有由多種發 光體混合而成的發光體層，前述發光體由從前述冷陰極電 子發射源場發射的電子激發發光； 前述各種發光體具有通過使各自發出的光混光而生成 白光的關係，分別分布在前述發光體層的表面上，能够由 前述場發射的電子直接照射，同時，至少任意一種前述發 r光體具有還可以被來自其他種類的前述發光體的光激發而 發光的特性。 根據本發明的發光裝置，可以高效地産生高亮度的白 光。 【實施方式】 下面，參照附圖說明本發明的實施方式。附圖涉及本 發明的一個實施方式，第一圖是發光裝置的基本結構圖， 第二圖是放大表示發光體層的示意圖，第三圖是對于藍色 發光體及黃色發光體的受激發光的說明圖，第四圖是表示 由藍色發光體自身、黃色發光體自身以及將其混合而成的 各個發光體層發出的光的亮度分布的圖表，第五圖是表示 發光體層中的藍色發光體和黃色發光體的重量比與亮度間 關係的圖表。 如第一圖所示，本實施方式中的發光裝置（1)是例如作 爲平面狀的場發射型白色照明燈使用的發光裝 义i，具具有 下述基本結構，即，在以規定間隔相對配置玻螭基板（2)、 200913000 ()而成的冑i备盗⑷内，從基底面側向投光面側依次配 置負極(5)、閘極⑽）、正極（15)。 負極（5)由形成在成爲基底面的玻璃基板（2)上的導電 材料構成’例如’通過蒸錢或賤鐘法等沈積紹或鎳等金屬， 或塗佈銀焊劑後龄、區、威 Μ 罵:k、，，吉寻而形成。在該負極（5)的表面以 :、k佈反，’·内米官、碳納米壁、Spindt型微形圓錐、金屬 "物阳須（wiskers)等發射極材料，形成冷陰極 源（6)。 ^ m 在本方式中，冷陰極電子發射源（6)在每個規定的區域 内：案化’在圖案化的區域(電子發射區域)的周圍，g己置 覆盖負極（5)的負極遮罩（7)。 a閘極（1 〇)由具有開口部⑴）的平板部件構成，該開口 ()用於使由冷陰極電子發射源（6)發射的電子通過。具 體地说’閘極。0)的要部以下述方式構成，例如在鎳材料、 :銹鋼材料、殷鋼材料等導電性金屬板上，利用單純的機 夕力工等形成與冷陰極電子發射源（6)的圖案區域相對應的 复開口 ⑴）。閘極（1〇)的開口部〇 ”例如形成爲圓孔， 其大小與形成爲凸台狀的冷陰極電子發射源⑹的圖案區域 相同或略大。由此，可以使從冷陰極電子發射源（6)發射的 大致所有的電子通過，並作爲用於發光的有效電子，從而 减少閘極(10)的電力損耗，可以實現無損耗閘極。 •正極（15)由配置在投光面即玻璃基板（3)的背面側的透 =導電薄膜（例如ΙΤΟ膜）構成，在及閘極（1Q)(負極⑼)相 對的表面上，形成由從冷陰極電子發射源（6)發射的電子激 200913000 發發光的發光體層（16)。 發光體層（16)由受激發而發光的光的波段不同的多種 發光體（螢光體混合而成，通過將這些來自各個發光體的光 混光而生成白光。在本實施方式中，發光體層6)例如由 受激發發出藍色光的藍色發光體（第一發光體）和受激發 發出與該藍色光具有補色關係的黃色光的黃色發光體（第 二發光體）混合而成。在這種情况下，藍色發光體優選例 如添加有若干ppm的活性劑的硫化鋅（zns)類藍色發光 體’該藍色發光體例如第四圖中虛線所示，通過由電子進 行激發發光’高發光效率地發出波段以4〇〇至6〇〇nm爲 主的藍色光。另一方面，黃色發光體優選釔、鋁、石榴石（YAG) 類的黃色發光體，該黃色發光體例如第四圖中點劃線所 不，通過由電子進行激發發光，高發光效率地發出波段以 450至650nm爲主的黃色光。此外，在本實施方式中使用 的YAG類的黃色發光體具有還可以由藍色光激發發出黃 r 色光的特性。 如第二圖所示，發光體層（16)，具體地說，由藍色發 光體粒子（17)和黃色發光體粒子（18)混合而成。各種發光 體粒子（17)、（18)分別暴露並分布在該發光體層（16)的表面 上’這些露出的發光體粒子（17)、（18)在真空容器（4)内， 各自由從冷陰極電子發射源（6)發射的電子直接照射。 這種發光體層（16)以下述方式形成，例如，通過將含 有黃色發光體粒子的分散液和含有藍色發光體粒子的分散 液，利用絲網印刷等依次塗佈在正極（15)上，經過妖處理 10 200913000 程序將各分散液的溶劑等除去而形成。 各個：光體粒子的分散液的濃度或塗佈量熱： = 條件等設定爲適當 ’、、、 、 雄、度將各發光體粒子 17 M i/ (15)上，從而可以使兩種發光體粒子 )()路出並分布在發光體層（16)的表面上。具體地說， 二如，在將含有黃色發光體粒子的分散液和含有 體粒子的分散液依次塗佈在正極⑽上的情况下，特別地 =過使含有藍色發光體粒子的分散液中溶劑所占比例增加 專’而使監色發光體粒子（17)以規定的較低密度分布，能 够在發光體層(16)的表面上，使一部分的黃色發光體粒子 (18)從藍色發光體粒子（彳7)的間隙中露出。 這樣，例如第二圖所不，藍色發光體粒子（彳7)通過由 攸冷陰極電子發射源（6)場發射的電子直接照射而受到電子 激發’發出藍色光Be。同樣地，黃色發光體粒子(18)通過Emission Display: The use of FED). % Among these light-emitting devices, various microscopic treatments of a micron order corresponding to a pixel size or the like are usually employed in the manufacturing process of 纟fed. For example, a conventional microscopic treatment for a semiconductor wafer or the like, such as a semiconductor film or a CVD method, is produced in the FED, and a cathode (negative electrode) is formed on an insulating substrate such as glass or ceramic. In addition, by directly on the insulating substrate, or by forming a material on the surface of the insulating substrate, and opening a plurality of thin plates having a diameter of 10 " to: columnar shape of (10) m m On the opening of the 10th, the phase is extremely thin. R is the same as the "melt material". On the other hand, for the negative electrode or the like, for the FEL dedicated to the light source for lamps, micron-scale fineness such as FED is not required. For the opening 邛 opened on the interpole 200913000, the diameter of the opening 邛 is a large diameter of the order of millimeters (for example, see 'Patent Document No. 2006-339〇12). Therefore, in the FEL manufacturing, the cancellation is made. The equipment requires a large amount of cost and other microscopic treatments, and the final various functional components can be manufactured only by shouting the mass-produced materials in the domain environment, and a substantial cost reduction can be achieved. A metal plate having a thickness of a few tenths of a millimeter constitutes a negative electrode and a gate as separate functional components of the material, and they are mounted in a vacuum container, and the FEL is manufactured at a low cost. [Invention] In many cases where FEL is used as a light source for various illuminations, it is required to emit white light. i However, as shown by an illuminant or the like which is widely used in a fluorescent tube, an illuminant that emits white light is excited by external stimuli. ...the development of a large number of high (four) slits, but for the illuminating moon (4) that emits white light by electron excitation, an illuminant that emits light with a sufficiently high luminance has not been developed. In FEL, for example, in a light-emitting light that is excited to emit white light, In the case where the breeze is obtained to obtain white light, the energy loss of the illuminant layer 曰 'may be difficult to efficiently produce high-brightness white light. illuminating ί: Ming is proposed in view of the above circumstances, the purpose of which is to provide -, Producing high-intensity white light. The main technical means adopted for the foregoing purposes is that the light-emitting device is characterized in that the light-emitting device is provided with a negative electrode in a vacuum container, and a cold cathode electron emission source is formed on the surface thereof in 200913000; An illuminant layer formed by mixing a plurality of illuminants is formed on a surface opposite to the negative electrode, and the illuminant is formed from the cold cathode The electron emission light emitted by the sub-emissive source field; the various illuminants described above have a relationship of generating white light by mixing the respective emitted light, and are respectively distributed on the surface of the illuminant layer, and can be directly irradiated by the electrons emitted from the field, and simultaneously At least one of the above-mentioned hair-emitting bodies has a characteristic that it can be excited by light from other types of the above-described illuminants to emit light. According to the light-emitting device of the present invention, high-intensity white light can be efficiently generated. The embodiments of the present invention are described with reference to the accompanying drawings in which: FIG. 1 is a schematic diagram of a basic structure of a light-emitting device, the second figure is a schematic view showing an enlarged illuminant layer, and the third figure is for blue light emission. An explanatory diagram of the excitation light of the body and the yellow illuminant, and the fourth diagram is a graph showing the luminance distribution of the light emitted by the blue illuminator itself, the yellow illuminator itself, and the respective illuminant layers obtained by mixing the illuminant layer, fifth The figure shows the relationship between the weight ratio and the brightness of the blue illuminant and the yellow illuminant in the illuminant layer. Table. As shown in the first figure, the light-emitting device (1) in the present embodiment is, for example, a light-emitting device i used as a planar field emission type white illumination lamp, and has a basic structure in which it is opposed at a predetermined interval. The negative electrode (5), the gate (10), and the positive electrode (15) are disposed in this order from the base surface side to the light projecting surface side in the cymbal substrate (2) and the 200913000 (). The negative electrode (5) is made of a conductive material formed on a glass substrate (2) serving as a base surface, for example, by depositing a metal such as nickel or the like by steaming or simmering, or coating a silver solder, age, area, and power. Μ 骂: k,,, formed by Jizhi. On the surface of the negative electrode (5), a cold cathode source is formed by: an anti-electrode material such as: k-b, anti-inner, carbon nanowall, Spindt-type micro-cone, metal "wiskers; 6). ^ m In this mode, the cold cathode electron emission source (6) is in each of the prescribed regions: the solution is placed around the patterned region (electron emission region), and the negative electrode covering the negative electrode (5) is covered. Cover (7). The a gate (1 〇) is composed of a plate member having an opening (1) for passing electrons emitted from the cold cathode electron emission source (6). Specifically speaking, the gate is. The main part of 0) is configured as follows. For example, on a conductive metal plate such as a nickel material, a stainless steel material or an Invar material, a pattern of a cold cathode electron emission source (6) is formed by a simple machine or the like. The corresponding opening of the area (1)). The opening portion 〇 of the gate electrode (1 〇) is formed, for example, as a circular hole having a size equal to or slightly larger than the pattern region of the cold cathode electron emission source (6) formed in a boss shape. Thus, electron emission from the cold cathode can be performed. Most of the electrons emitted by the source (6) pass through, and serve as effective electrons for illuminating, thereby reducing the power loss of the gate (10), and a lossless gate can be realized. • The positive electrode (15) is disposed on the light projecting surface. That is, a transparent conductive film (for example, a ruthenium film) on the back side of the glass substrate (3) is formed on the surface opposite to the gate (1Q) (negative electrode (9)) by emission from the cold cathode electron emission source (6). The electron-excited illuminant layer (16) emits light in 200913000. The illuminant layer (16) is composed of a plurality of illuminants (fluorescent bodies) having different wavelength bands of light that are excited to emit light, and the light from the respective illuminants is mixed by light. In the present embodiment, the illuminant layer 6) is, for example, a blue illuminator (first illuminant) that is excited to emit blue light, and a yellow illuminator that is excited to emit yellow light having a complementary color relationship with the blue light. (No. The illuminant is mixed. In this case, the blue illuminant is preferably, for example, a zinc sulphide (zns)-based blue illuminant to which a few ppm of an active agent is added, such as the dotted line in the fourth figure. It is shown that blue light having a wavelength band of 4 〇〇 to 6 〇〇 nm is emitted by excitation of light by electrons. The yellow illuminant is preferably yellow of yttrium, aluminum, garnet (YAG). In the illuminant, for example, the yellow illuminator is excited by the electrons, and the yellow light mainly having a wavelength band of 450 to 650 nm is emitted with high luminous efficiency, for example, in the fourth embodiment. The yellow illuminant of the YAG type has a characteristic that it can also be excited by blue light to emit yellow-colored light. As shown in the second figure, the illuminant layer (16), specifically, the blue illuminant particle (17) and the yellow illuminant The particles (18) are mixed. The various illuminant particles (17), (18) are exposed and distributed on the surface of the illuminant layer (16), respectively. 'The exposed illuminant particles (17), (18) are in a vacuum container. (4) inside, each free from The electrons emitted from the cold cathode electron emission source (6) are directly irradiated. The illuminant layer (16) is formed in the following manner, for example, by using a dispersion containing yellow illuminant particles and a dispersion containing blue illuminant particles. Screen printing or the like is sequentially applied to the positive electrode (15), and the solvent or the like of each dispersion liquid is removed by the process of the demon treatment 10 200913000. Each: the concentration of the dispersion of the photo-particles or the coating amount of heat: = conditions, etc. The illuminant particles 17 M i/(15) are set so as to be appropriate, and the two illuminant particles can be routed and distributed on the surface of the illuminant layer (16). Specifically, in the case where the dispersion containing the yellow illuminant particles and the dispersion containing the bulk particles are sequentially applied to the positive electrode (10), in particular, the dispersion containing the blue illuminant particles is excessively passed. The proportion of the solvent is increased, and the color illuminator particles (17) are distributed at a predetermined lower density, and a part of the yellow illuminant particles (18) can be emitted from the blue light on the surface of the illuminant layer (16). Body particle彳7) is exposed in the gap. Thus, for example, in the second figure, the blue illuminant particles (彳7) are electron-excited by the direct emission of electrons emitted from the field of the 阴极cool cathode electron emission source (6) to emit blue light Be. Similarly, the yellow illuminant particles (18) pass
由從冷陰極電子發射源(6)場發射的電子直接照射而受到電 子激發，發出黃色光Ye。此外，黃色發光體粒子（18)由附 近的藍色發光體粒子（17)發出的藍色光Be光激發，發出 η色光Y1。上述藍色光Be和黃色光Ye、Y1在玻璃基板（3) 的投光面側混光，由此，發光裝置（1)高效地産生高亮度的 白光W。 也就是說，通過使藍色發光體粒子（彳7)及黃色發光體 粒子（18)暴露在發光體層（16)的表面上，可以使各發光體 粒子（1 7) ' (18)由電子直接照射，與例如使藍色發光體粒 子（1 7)和黃色發光體粒子（1 8)以單獨的層狀重叠而形成發 11 200913000 光體層的情况等相比，可以利用電子激發而高效地發出藍 色光及黃色光這兩者。此外，各發光體粒子（17)、（18)的 至少一部分也可以不完全暴露在發光體層的表面上，即使 在發光體層的表面上或各粒子之間存在例如玻璃或二氧化 矽等其他物質的情况下，只要該物質具有使場發射的電子 透過的性質，就可以使各發光體粒子（17)、（18)由電子直 接照射，獲得同樣的效果。 f 而且，本實施方式的黃色發光體粒子（18)，因爲具有 除了電子之外’還可由藍色光激勵發光的特性，所以即使 在電子激發産生的藍色光的一部分在通過發光體層（16)時 被黃色發光體粒子（1 8)遮擋的情况下，也可以有效利用該 藍色光來實現黃色光的亮度提高。 也就是說’如果使電子激發形成的藍色發光體單色發 光亮度爲Lb，電子激發形成的黃色發光體單色亮度爲匕乂， 藍色發光體和黃色發光體的混合比例爲A:B ( A + B=1 ), V 則使由各發光體電子受激發得到的藍色光和黃色光之間混 光而生成的白光W的亮度Lw，通常成爲各個亮度的加權 平均，具有下述關係：The electrons emitted from the field emitted from the cold cathode electron emission source (6) are directly excited by electrons to emit yellow light Ye. Further, the yellow illuminant particles (18) are excited by the blue light Be light emitted from the nearby blue illuminant particles (17) to emit the η color light Y1. The blue light Be and the yellow light Ye and Y1 are mixed on the light projecting surface side of the glass substrate (3), whereby the light-emitting device (1) efficiently generates white light W of high luminance. That is, by exposing the blue illuminant particles (彳7) and the yellow illuminant particles (18) to the surface of the illuminant layer (16), each illuminant particle (17) '(18) can be made electronic The direct irradiation can be efficiently performed by using electron excitation, for example, when the blue illuminant particles (17) and the yellow illuminant particles (18) are stacked in a single layer to form a light-emitting layer 11 200913000. Both blue and yellow light are emitted. Further, at least a part of each of the illuminant particles (17) and (18) may not be completely exposed on the surface of the illuminant layer, even if other substances such as glass or cerium oxide exist on the surface of the illuminant layer or between the respective particles. In the case where the substance has a property of transmitting electrons emitted from the field, each of the illuminant particles (17) and (18) can be directly irradiated with electrons, and the same effect can be obtained. f Further, the yellow illuminant particles (18) of the present embodiment have characteristics of being excited by blue light in addition to electrons, so that even when a part of the blue light generated by the electron excitation passes through the illuminant layer (16) When the yellow illuminant particles (18) are blocked, the blue light can be effectively utilized to improve the luminance of the yellow light. That is to say, 'if the blue illuminant formed by the electron excitation has a monochromatic luminescence brightness of Lb, the yellow illuminant formed by the electron excitation has a monochromatic brightness of 匕乂, and the blue illuminant and the yellow illuminant have a mixture ratio of A:B. (A + B = 1), V, the luminance Lw of the white light W generated by mixing the blue light and the yellow light excited by the electrons of the respective illuminants, usually as a weighted average of the respective luminances, and having the following relationship :
Lw = A^LbH~ B^Ly 在此基礎上，本實施方式的發光體層（16)上，因爲鲁 色發光體粒子（1 8)還可被藍色光激勵發光’所以可以相應 地提高白光的亮度。例如，如第五圖中實線所示，由本實 施方式的發光體層（16)得到的白光的亮度，高於由電子激 土开> 成的藍色光及黃色光的各自亮度的加權平均值。 12 200913000 在這裏，發光體層（16)中的藍色發光體粒子（17)和黃 色發光體粒子（1 8)的混合比’是在考慮由藍色光進行光激 發産生的黃色光的亮度的基礎上而設定的。在這種情况 下，由藍色光進行光激發得到的黃色光對白光的亮度Lw 的影響，隨藍色發光體和黃色發光體的重量比變化而變 化。也就是說，每單位量的黃色發光體通過光激發而發出 的頁色光Y1的凴度，隨著藍色發光體的比例增大而增加。 1另一方面，如果藍色發光體的比例大於或等於規定值，則 因爲黃色發光體的絕對量减少，所以由光激發得到的黃色 光丫1的亮度在白光的總體亮度Lw中所占的比例减少。如 果考慮這種光激發得到的黃色光Y1的影響，則例如第五 圖所示，使藍色發光體和黃色發光體的重量比爲例如3:1 至1:1的範圍内，則能够獲得較理想的白光。 廿根據這種實施方式，使用發光效率較高的藍色發光體 和K色夯光體形成發光體層（16)，由此不使用發光效率低 ί的白色么光體就可以生成白光。此時，通過使藍色發光體 粒子（1 7)和黃色發光體粒子（18)分別暴露幷分布在發光體 層（16)的表面上，發光體粒子（17)、（彳8)都可以由電子直接 照射，實現效率良好的電子激發。而且，通過使用除了電 發之外還可以由藍色光進行光激發而發出黃色光的 等作爲S色發光體，即使在由藍色發光體粒子（1 7)發 出的監色光的-部分在通過發光體層（16)時被黃色發光體 粒子（1 8)遮擋的情况下，也可以將該藍色光用於黃色光的 發光，可以减少能量損耗，高效地生成白光。 13 200913000 此外，在上述實施方式中，對於使用藍色發光體和黃 色發光體這二種發光體形成發光體層的一個例子進行了說 明，但本發明並不限定於此，也可以使用二種或三種以上 的其他發光顔色的發光體混合形成發光體層。 【圖式簡單說明】 第一圖：係本發明之發光裝置的基本結構圖。 第二圖：係本發明之發光裝置中放大表示發光體層的 示意圖。 第二圖：係本發明之發光裝置 光體的受激發發光的說明圖。 中藍色發光體及黃色發 身、 發出 第四圖：係表示由本發明之發光裝 黃色發光體自身以及將其混合而形 的光的亮度分布的圖表。 置中藍色發光體自 成的各個發光體層 V. 苐五圖·係表示本發明之發光 色發光體和黃色發光體的重量比二置… A度間關係的圖表。 【主要元件符號說明】 (1) 發光裝置(2) (3)玻璃基板 (4) 真空容器 (5) 負極 (6) 冷陰極電子發射源 (7) 負極遮罩 14 200913000 (10)閘極 (1 1)開口部 (15) 正極 (16) 發光體層 (17) 藍色發光體粒子 (18) 黃色發光體粒子Lw = A^LbH~ B^Ly On the basis of this, in the illuminant layer (16) of the present embodiment, since the lulu illuminant particles (18) can also be excited by blue light to emit light, the white light can be correspondingly improved. brightness. For example, as shown by the solid line in the fifth figure, the luminance of the white light obtained by the illuminant layer (16) of the present embodiment is higher than the weighted average of the respective luminosity of the blue light and the yellow light by the electron priming. . 12 200913000 Here, the mixing ratio of the blue illuminant particles (17) and the yellow illuminant particles (18) in the illuminant layer (16) is the basis of considering the luminance of the yellow light generated by the blue light. Set up on the top. In this case, the influence of the yellow light obtained by the light excitation by the blue light on the luminance Lw of the white light changes as the weight ratio of the blue illuminant and the yellow illuminator changes. That is, the intensity of the page color light Y1 emitted by the light luminescence per unit amount of the yellow illuminator increases as the proportion of the blue illuminant increases. On the other hand, if the ratio of the blue illuminant is greater than or equal to a predetermined value, since the absolute amount of the yellow illuminator is reduced, the luminance of the yellow aperture 1 obtained by the light excitation is occupied by the overall luminance Lw of the white light. The proportion is reduced. If the influence of the yellow light Y1 obtained by such photoexcitation is considered, for example, as shown in the fifth figure, the weight ratio of the blue illuminant to the yellow illuminant is, for example, in the range of 3:1 to 1:1, More ideal white light. According to this embodiment, the illuminant layer (16) is formed using the blue illuminant having a high luminous efficiency and the K color illuminating body, whereby white light can be generated without using a white illuminating body having a low luminous efficiency. At this time, by exposing the blue illuminant particles (17) and the yellow illuminant particles (18) to the surface of the illuminant layer (16), the illuminant particles (17) and (彳8) can be composed of Direct electron irradiation for efficient electronic excitation. Further, by using, in addition to the electric hair, light emitted by blue light to emit yellow light or the like as an S color light-emitting body, even if the - part of the color light emitted by the blue light-emitting body particle (17) passes through When the illuminant layer (16) is blocked by the yellow illuminant particles (18), the blue light can be used for illuminating yellow light, and energy loss can be reduced, and white light can be efficiently generated. 13 200913000 In the above embodiment, an example in which the illuminant layer is formed using two kinds of illuminants, a blue illuminant and a yellow illuminant, has been described. However, the present invention is not limited thereto, and two or The illuminants of three or more other luminescent colors are mixed to form an illuminant layer. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a basic structural view of a light-emitting device of the present invention. Fig. 2 is a schematic view showing an enlarged view of an illuminant layer in the illuminating device of the present invention. Fig. 2 is an explanatory view showing the excited light emission of the light-emitting device of the present invention. Medium blue illuminator and yellow body, and the fourth figure is a graph showing the luminance distribution of the light emitted by the illuminating yellow illuminator of the present invention and the shape of the illuminating body. Each of the illuminant layers in which the blue illuminator is self-contained is shown in Fig. 5. Fig. 5 is a graph showing the relationship between the weight ratio of the illuminating illuminant and the yellow illuminator of the present invention. [Description of main component symbols] (1) Light-emitting device (2) (3) Glass substrate (4) Vacuum container (5) Negative electrode (6) Cold cathode electron emission source (7) Negative electrode mask 14 200913000 (10) Gate ( 1 1) Opening (15) Positive (16) Luminescent layer (17) Blue illuminant particles (18) Yellow illuminant particles