JP2000096046A - Fluorescent screen for field emission display and field emission display - Google Patents
Fluorescent screen for field emission display and field emission displayInfo
- Publication number
- JP2000096046A JP2000096046A JP10303153A JP30315398A JP2000096046A JP 2000096046 A JP2000096046 A JP 2000096046A JP 10303153 A JP10303153 A JP 10303153A JP 30315398 A JP30315398 A JP 30315398A JP 2000096046 A JP2000096046 A JP 2000096046A
- Authority
- JP
- Japan
- Prior art keywords
- phosphor
- film
- sulfide
- field emission
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は加速電圧が０．１〜１５
ｋＶであり、電流密度が１００μＡ〜１０ｍＡの電子線
によって高効率、かつ安定的に発光する電界放出型ディ
スプレイ用蛍光膜（以下、「ＦＥＤ用蛍光膜」という）
及びこれを用いた電界放出型ディスプレイ装置（以下
「ＦＥＤ」という）に関する。The present invention relates to an accelerating voltage of 0.1 to 15
A fluorescent film for a field emission display (hereinafter, referred to as a “FED fluorescent film”) that emits light at a high efficiency and stably by an electron beam of kV and a current density of 100 μA to 10 mA
And a field emission display device using the same (hereinafter referred to as “FED”).
【０００２】[0002]
【従来の技術】各種デイスプレイ装置は主としてその用
途に応じてそれぞれ画面の大型化、フラット化、薄型化
が求められている。その中、電子線励起下での蛍光体の
発光を利用した陰極線管ディスプレイ（ＣＲＴ）は高輝
度、高精細なディスプレイとして広く利用されている
が、特にフラット化、薄型化という点では限度があり、
フラット化及び薄型化を追求するディスプレイの一つと
して近年来、ＦＥＤが注目され、開発されつつある。2. Description of the Related Art Various display devices are required to have a large screen, a flat screen, and a thin screen, respectively, mainly according to the application. Among them, a cathode ray tube display (CRT) using light emission of a phosphor under excitation of an electron beam is widely used as a high-brightness and high-definition display, but there is a limit in particular in terms of flatness and thinning. ,
In recent years, FEDs have attracted attention and are being developed as one of displays pursuing flatness and thinning.
【０００３】ＦＥＤは真空外囲器内に電子を放出する平
面状の電界放出型カソードとアノードとをわずかな間隔
を持たせて対向して配置し、アノード上のカソードと対
向する面の所定の位置に電子線励起下で各色に発光する
蛍光体からなる蛍光膜を設けておき、各カソードから画
像信号に対応する、加速電圧が０．１〜１５ｋＶの中圧
電子線を放出させることによってアノード上の各蛍光膜
を発光させて画像を表示させる平面ディスプレイで、消
費電力が少なく、液晶ディスプレイ（ＬＣＤ）よりも優
位なフラットで薄型のディスプレイとして期待されつつ
ある。[0003] In the FED, a planar field emission cathode for emitting electrons and an anode are disposed in a vacuum envelope so as to be opposed to each other with a slight space therebetween. A fluorescent film made of a phosphor that emits light of each color under electron beam excitation is provided at a position, and a medium-voltage electron beam having an acceleration voltage of 0.1 to 15 kV corresponding to an image signal is emitted from each cathode to form an anode. It is a flat-panel display that emits light from each of the above fluorescent films to display an image, consumes less power, and is expected to be a flat and thin display that is superior to a liquid crystal display (LCD).
【０００４】しかしながら、このＦＥＤはカソードと蛍
光膜（アノード）との間の距離がＣＲＴに比較して極め
て小さいことと、蛍光膜を発光させる電子線の加速電圧
が低く、逆にその電流密度がＣＲＴの１０〜１０００倍
の高密度であるため、ＦＥＤ用蛍光膜はＣＲＴ用蛍光膜
に比べ、使用中に電子線による劣化を受けて経時的な発
光輝度の低下や発光色の変化が起こり易い。However, in this FED, the distance between the cathode and the fluorescent film (anode) is extremely small as compared with the CRT, and the acceleration voltage of the electron beam for emitting light from the fluorescent film is low. Since the density is 10 to 1000 times higher than that of a CRT, the fluorescent film for an FED is more likely to be deteriorated with time due to an electron beam during use and to have a decrease in emission luminance or a change in emission color as compared with a CRT fluorescent film. .
【０００５】ところで、従来ＦＥＤ用の青色ないし緑色
蛍光体としてはＣＲＴの蛍光膜として用いられている、
硫化亜鉛を主要の母体とする硫化物系蛍光体が用いられ
てきたが、この硫化物系蛍光体はそのままＦＥＤ用蛍光
膜として用いた場合、特に発光輝度の経時的な低下が著
しいため、その改良が強く望まれていた。Conventionally, blue or green phosphors for FED have been used as CRT phosphor films.
Sulfide-based phosphors containing zinc sulfide as a main matrix have been used. However, when this sulfide-based phosphor is used as it is as a fluorescent film for FED, the emission luminance is particularly remarkably reduced with time. Improvement was strongly desired.
【０００６】また、発光輝度も出来るだけ高いことが要
望されるが、上述のようにＦＥＤの場合、ＣＲＴの場合
に比べて加速電圧は低く、より高電流密度の電子線で励
起された時、高輝度の発光を呈する必要があるため、必
ずしも従来のＣＲＴ用蛍光体であればＦＥＤの蛍光膜に
適用したときにも高輝度の発光を呈するとは限らないと
ころから中速、高電流密度の電子線励起下で高輝度の発
光をする蛍光膜の開発が求められていた。[0006] In addition, although the emission luminance is required to be as high as possible, the acceleration voltage of the FED is lower than that of the CRT as described above, and when excited by an electron beam having a higher current density, Since it is necessary to emit high-luminance light, a conventional phosphor for CRT does not necessarily emit high-luminance even when applied to the phosphor film of the FED. There has been a demand for the development of a fluorescent film that emits light with high brightness under electron beam excitation.
【０００７】[0007]
【発明が解決しようとする課題】本発明は加速電圧がお
よそ０．１〜１５ｋＶであり、５μＡ〜１０ｍＡの高電
流密度の中速電子線を照射して発光させた時、高輝度
で、経時的な輝度低下が少なく、発光色の色純度の良好
なＦＥＤ用蛍光膜及びこれを用いたＦＥＤを提供するこ
とを目的とする。SUMMARY OF THE INVENTION The present invention has an acceleration voltage of about 0.1 to 15 kV, a high current density of 5 .mu.A to 10 mA, emits light when irradiated with a medium-speed electron beam, and has a high luminance and a long time. It is an object of the present invention to provide a fluorescent film for an FED, which has a small reduction in luminance and a good color purity of an emission color, and an FED using the same.
【０００８】[0008]
【課題を解決するための手段】本発明者等は上記目的を
達成するために、多数の蛍光体単体もしくはこれらの混
合物からなる混合蛍光体について鋭意検討した結果、硫
化物系蛍光体に特定の酸化物系蛍光体を混合してなる混
合蛍光体を蛍光膜とするか、もしくは硫化物蛍光体を使
用した蛍光体層の上層に特定の酸化物系蛍光体を使用し
た蛍光体層を積層することによって上記目的が達成し得
ることを見出し、本発明に至った。Means for Solving the Problems To achieve the above object, the present inventors have conducted intensive studies on a large number of phosphors alone or a mixture of these phosphors. A mixed phosphor obtained by mixing an oxide phosphor is used as a phosphor film, or a phosphor layer using a specific oxide phosphor is laminated on a phosphor layer using a sulfide phosphor. As a result, the present inventors have found that the above object can be achieved, and have accomplished the present invention.
【０００９】即ち本発明は （１）支持体上に硫化物系蛍光体とイットリウムのアル
ミン酸塩系もしくは珪酸塩系蛍光体である酸化物系蛍光
体との混合蛍光体からなる蛍光体層を設けてなることを
特徴とする電界放出型ディスプレイ用蛍光膜。 （２）上記混合蛍光体中における、上記硫化物系蛍光体
に対する上記酸化物系蛍光体の混合比が５〜８０重量％
であることを特徴とする上記（１）に記載の電界放出型
ディスプレイ用蛍光膜。 （３）支持体上に硫化物系蛍光体からなる蛍光体層と、
イットリウムのアルミン酸塩系もしくは珪酸塩系蛍光体
である酸化物系蛍光体からなる蛍光体層とをこの順に積
層してなることを特徴とする電界放出型ディスプレイ用
蛍光膜。That is, the present invention provides (1) a phosphor layer comprising a mixed phosphor of a sulfide phosphor and an oxide phosphor which is an aluminate or silicate phosphor of yttrium on a support; A phosphor film for a field emission display characterized by being provided. (2) The mixing ratio of the oxide-based phosphor to the sulfide-based phosphor in the mixed phosphor is 5 to 80% by weight.
The phosphor film for a field emission display according to the above (1), wherein: (3) a phosphor layer comprising a sulfide phosphor on a support;
A phosphor film for a field emission display, comprising: a phosphor layer made of an oxide phosphor that is an aluminate or silicate phosphor of yttrium.
【００１０】（４）上記酸化物系蛍光体からなる蛍光体
層の厚みが、上記硫化物系蛍光体からなる蛍光体層の厚
みの０．０５〜２倍であることを特徴とする上記（３）
に記載の電界放出型ディスプレイ用蛍光膜。 （５）上記硫化物系蛍光体が銅及びアルミニウム付活硫
化亜鉛緑色発光蛍光体（ＺｎＳ：Ｃｕ，Ａｌ）であり、
上記酸化物系蛍光体がテルビウム付活アルミン酸イット
リウム緑色発光蛍光体（Ｙ３Ａｌ５Ｏ１２：Ｔｂ）であ
ることを特徴とする上記（１）〜（４）に記載の電界放
出型ディスプレイ用蛍光膜。 （６）上記硫化物系蛍光体が銀及びアルミニウム付活硫
化亜鉛青色発光蛍光体（ＺｎＳ：Ａｇ，Ａｌ）であり、
上記酸化物系蛍光体がセリウム付活珪酸イットリウム青
色発光蛍光体（Ｙ２ＳｉＯ５：Ｃｅ）であることを特徴
とする上記（１）〜（４）のいずれかに記載の電界放出
型ディスプレイ用蛍光膜。 （７）真空外囲器内に少なくとも電界放出用カソード
と、これに対向するアノードと、該アノードの上記カソ
ード側に設けられた蛍光膜とを有し、上記カソードから
放出される加速電圧０．１〜１５ｋＶの電子線によって
上記蛍光膜を発光させる電界放出型ディスプレイ装置に
おいて、上記蛍光膜が上記（１）〜（６）のいずれかに
記載の蛍光膜からなることを特徴とする電界放出型ディ
スプレイ装置。である。(4) The thickness of the phosphor layer composed of the oxide phosphor is 0.05 to 2 times the thickness of the phosphor layer composed of the sulfide phosphor. 3)
3. The phosphor film for a field emission display according to claim 1. (5) the sulfide-based phosphor is a copper- and aluminum-activated zinc sulfide green-emitting phosphor (ZnS: Cu, Al);
The field emission display according to any one of (1) to (4), wherein the oxide-based phosphor is a terbium-activated yttrium aluminate green light-emitting phosphor (Y 3 Al 5 O 12 : Tb). Fluorescent film. (6) the sulfide-based phosphor is a silver- and aluminum-activated zinc sulfide blue-emitting phosphor (ZnS: Ag, Al);
The field emission display according to any one of (1) to (4), wherein the oxide-based phosphor is a cerium-activated yttrium silicate blue-emitting phosphor (Y 2 SiO 5 : Ce). Fluorescent film. (7) At least a field emission cathode in a vacuum envelope, an anode facing the cathode, and a fluorescent film provided on the cathode side of the anode, and an accelerating voltage of 0.1 V emitted from the cathode. A field emission type display device in which the phosphor film emits light by an electron beam of 1 to 15 kV, wherein the phosphor film comprises the phosphor film according to any one of the above (1) to (6). Display device. It is.
【００１１】[0011]
【発明の実施の形態】以下、本発明を更に詳細に説明す
る。本発明のＦＥＤ用蛍光膜を製造するには特定の硫化
物系蛍光体と酸化物系蛍光体とを所定の割合で混合す
る。両蛍光体の混合は粉体同士を篩、ミル等を用いて行
っても良いし、水等の媒体中に懸濁させ、十分に攪拌し
てから脱水し、乾燥させても良く、特に制限はない。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. To manufacture the FED phosphor film of the present invention, a specific sulfide-based phosphor and an oxide-based phosphor are mixed at a predetermined ratio. The mixing of the two phosphors may be performed by using a sieve, a mill, or the like for the powders, or suspended in a medium such as water, sufficiently stirred, then dehydrated, and then dried. There is no.
【００１２】硫化物系蛍光体と酸化物系蛍光体との混合
割合は硫化物系蛍光体に対する酸化物系蛍光体の割合
で、５〜８０重量％とするのが良く、特に好ましくは２
０〜７０重量％とするのがより好ましい。酸化物系蛍光
体の混合量が硫化物系蛍光体に対して５重量％より少な
いと、得られる蛍光膜の電子線照射により蛍光膜の経時
的な発光輝度の低下が著しくなり、発光色度も変化す
る。また、逆にこの混合量が８０重量％より多いと初期
における発光輝度が低下すると同時に発光色純度が悪く
なるため好ましくない。The mixing ratio of the sulfide-based phosphor and the oxide-based phosphor is preferably 5 to 80% by weight, particularly preferably 2 to 80% by weight, based on the ratio of the oxide-based phosphor to the sulfide-based phosphor.
More preferably, it is 0 to 70% by weight. If the mixing amount of the oxide-based phosphor is less than 5% by weight with respect to the sulfide-based phosphor, the emission luminance of the phosphor film decreases significantly with time due to electron beam irradiation of the resulting phosphor film, and the emission chromaticity is increased. Also change. Conversely, if the mixing amount is more than 80% by weight, the emission luminance in the initial stage is lowered, and the emission color purity is undesirably deteriorated.
【００１３】このようにして得た特定の硫化物系蛍光体
と酸化物系蛍光体との混合蛍光体を、例えばガラスなど
の透明支持体上に塗布して蛍光体層を形成する。この
時、支持体の表面にはＩＴＯ等の透明導電膜を予め形成
しておく。The phosphor mixture obtained by mixing the specific sulfide phosphor and the oxide phosphor thus obtained is coated on a transparent support such as glass to form a phosphor layer. At this time, a transparent conductive film such as ITO is formed on the surface of the support in advance.
【００１４】支持体上への蛍光体層の形成方法は、特に
公知の他のディスプレイ用蛍光膜の形成方法と変わると
ころはなく、例えば、水ガラス等のバインダーを含む水
の入った容器の器底にガラス等の支持体を沈めておき、
この中に上述のようにして得られた混合蛍光体の所定量
を投入して攪拌し、器底の支持体の上に沈積させて、い
わゆる、沈降塗布法によって蛍光膜を形成しても良い
し、また、得られた混合蛍光体と水溶性の感光性樹脂バ
インダーとを水等の溶媒中に懸濁させて感光性樹脂スラ
リーを調整し、これを支持体上に塗布した後、所定のパ
ターンに露光してから、末露光部を洗い流す、いわゆる
ホトリソ法によって蛍光膜を作成しても良い。さらにま
た、得られた混合蛍光体を例えば、エチルセルロースな
どのバインダー樹脂、モノエチルカルビトールなどの有
機溶剤と共に混練して蛍光体ペーストとし、これを支持
体の所定の位置に印刷塗布した後、乾燥、ベーキング処
理を施して蛍光膜を形成する、いわゆる印刷法によって
も良い。The method of forming a phosphor layer on a support is not particularly different from the known method of forming a phosphor film for a display. For example, a container of water containing a binder such as water glass may be used. Submerge a support such as glass at the bottom,
Into this, a predetermined amount of the mixed phosphor obtained as described above is charged, stirred, and deposited on a support at the bottom of the vessel, and a phosphor film may be formed by a so-called sedimentation coating method. Then, the obtained mixed phosphor and a water-soluble photosensitive resin binder are suspended in a solvent such as water to prepare a photosensitive resin slurry, and after applying this on a support, a predetermined The phosphor film may be formed by a so-called photolithographic method, in which the exposed portion is washed away after the pattern is exposed. Furthermore, for example, the obtained mixed phosphor is kneaded with a binder resin such as ethyl cellulose and an organic solvent such as monoethyl carbitol to form a phosphor paste, which is printed and applied to a predetermined position on a support, and then dried. Alternatively, a so-called printing method of forming a fluorescent film by performing a baking process may be used.
【００１５】また、本発明のＦＥＤ用蛍光膜は上述のよ
うに支持体上に硫化物系蛍光体と酸化物系蛍光体との混
合蛍光体からなる蛍光体層を形成する代わりに、支持体
上に先ず、硫化物蛍光体からなる蛍光体層を設けてお
き、その上に重畳させて酸化物系蛍光体からなる蛍光体
層をを積層させても良い。この場合、支持体上に蛍光体
層を重畳させるには、上述の印刷法により、支持体上に
各蛍光体層を順次形成するのが好ましい。このように本
発明のＦＥＤ用蛍光膜を製造するに際し、支持体上に複
数層の蛍光層を形成する場合には、支持体の上層（表面
側）に形成する酸化物系蛍光体層の厚みは、支持体上に
先に形成されている下層（支持体側）の硫化物系蛍光体
からなる蛍光体層の厚みに対して０．０５〜２倍、より
好ましくは０．１〜０．５倍の厚みとするのが、得られ
る蛍光膜の経時的な発光輝度低下の抑制並びに初期にお
ける発光輝度の点から好ましい。Further, the FED phosphor film of the present invention is different from the above-mentioned one in that a phosphor layer composed of a mixed phosphor of a sulfide phosphor and an oxide phosphor is formed on the support as described above. First, a phosphor layer made of a sulfide phosphor may be provided, and a phosphor layer made of an oxide phosphor may be stacked on the phosphor layer. In this case, in order to overlap the phosphor layers on the support, it is preferable to sequentially form the respective phosphor layers on the support by the above-described printing method. In the case where a plurality of fluorescent layers are formed on a support in manufacturing the fluorescent film for FED of the present invention as described above, the thickness of the oxide-based fluorescent layer formed on the support (top surface side) Is 0.05 to 2 times, more preferably 0.1 to 0.5 times, the thickness of the lower layer (support side) of a sulfide-based phosphor previously formed on the support. It is preferable that the thickness be twice as large in terms of suppressing the decrease of the emission luminance over time of the obtained fluorescent film and the initial emission luminance.
【００１６】本発明のＦＥＤ用蛍光膜に用いられる硫化
物系蛍光体としては、発光輝度及び発光色の観点から、
銅、アルミニウム付活硫化亜鉛蛍光体（ＺｎＳ：Ｃｕ，
Ａｌ）、金、アルミニウム付活硫化亜鉛蛍光体（Ｚｎ
Ｓ：Ａｕ，Ａｌ）、銅、アルミニウム付活硫化亜鉛・カ
ドミウム蛍光体｛（Ｚｎ，Ｃｄ）Ｓ：Ｃｕ，Ａｌ｝、
金、アルミニウム付活硫化亜鉛・カドミウム蛍光体
｛（Ｚｎ，Ｃｄ）Ｓ：Ａｕ，Ａｌ｝、銀、アルミニウム
付活硫化亜鉛蛍光体（ＺｎＳ：Ａｇ，Ａｌ）、銀、クロ
ル付活硫化亜鉛蛍光体（ＺｎＳ：Ａｇ，Ｃｌ）、マンガ
ン付活硫化亜鉛蛍光体（ＺｎＳ：Ｍｎ）等の、亜鉛を含
む硫化物を母体とする硫化物系蛍光体が挙げられるが、
発光輝度及び発光色の観点から、特に緑色発光蛍光体で
は銅、アルミニウム付活硫化亜鉛蛍光体（ＺｎＳ：Ｃ
ｕ，Ａｌ）が、また、青色発光蛍光体では銀、アルミニ
ウム付活硫化亜鉛蛍光体（ＺｎＳ：Ａｇ，Ａｌ）が推奨
される。The sulfide-based phosphor used in the FED phosphor film of the present invention may be selected from the viewpoints of emission luminance and emission color.
Copper and aluminum activated zinc sulfide phosphor (ZnS: Cu,
Al), gold, aluminum activated zinc sulfide phosphor (Zn)
S: Au, Al), copper, aluminum-activated zinc sulfide / cadmium phosphor {(Zn, Cd) S: Cu, Al},
Gold, aluminum activated zinc sulfide / cadmium phosphor {(Zn, Cd) S: Au, Al}, silver, aluminum activated zinc sulfide phosphor (ZnS: Ag, Al), silver, chlorine activated zinc sulfide phosphor (ZnS: Ag, Cl), manganese-activated zinc sulfide phosphor (ZnS: Mn), and other sulfide-based phosphors containing a sulfide containing zinc as a host, and the like.
From the viewpoint of light emission luminance and light emission color, in particular, for a green light emitting phosphor, a copper or aluminum activated zinc sulfide phosphor (ZnS: C
u, Al), and silver and aluminum-activated zinc sulfide phosphor (ZnS: Ag, Al) are recommended for the blue light-emitting phosphor.
【００１７】一方、本発明のＦＥＤ用蛍光膜に用いられ
る酸化物系蛍光体としては、金属の酸化物を母体とする
蛍光体であれば何でも良いのではなく、テルビウム付活
アルミン酸イットリウム蛍光体（Ｙ３Ａｌ５Ｏ１２：Ｔ
ｂ）、テルビウム付活アルミニウム・ガリウム酸イット
リウム蛍光体｛Ｙ３（Ａｌ，Ｇａ）５Ｏ１２：Ｔｂ｝、
テルビウム付活アルミン酸イットリウム・ガドリニウム
蛍光体｛（Ｙ， Ｇｄ）３Ａｌ５Ｏ１２：Ｔｂ｝等のイ
ットリウムのアルミン酸塩系蛍光体、セリウム付活珪酸
イットリウム蛍光体（Ｙ２ＳｉＯ５：Ｃｅ）、セリウム
付活珪酸イットリウム・ガドリニウム蛍光体｛（Ｙ，Ｇ
ｄ）２ＳｉＯ５：Ｃｅ｝等のイットリウムの珪酸塩系蛍
光体等の、イットリウム（Ｙ）を母体結晶中に含む酸化
物系蛍光体が挙げられるが、特に得られる蛍光膜の発光
輝度の経時的な低下をより抑制し得る点でテルビウム付
活アルミン酸イットリウム緑色発光蛍光体（Ｙ３Ａｌ５
Ｏ１２：Ｔｂ）もしくはセリウム付活珪酸イットリウム
青色発光 蛍光体（Ｙ２ＳｉＯ５：Ｃｅ）が推奨され
る。On the other hand, the oxide-based phosphor used in the FED phosphor film of the present invention is not limited to any phosphor as long as it is a phosphor mainly composed of a metal oxide, and is a terbium-activated yttrium aluminate phosphor. (Y 3 Al 5 O 12 : T
b), terbium-activated aluminum / yttrium gallate phosphor {Y 3 (Al, Ga) 5 O 12 : Tb},
Yttrium aluminate-based phosphor such as terbium-activated yttrium / gadolinium aluminate phosphor {(Y, Gd) 3 Al 5 O 12 : Tb}, cerium-activated yttrium silicate phosphor (Y 2 SiO 5 : Ce) , Cerium-activated yttrium gadolinium silicate phosphor (Y, G
d) 2 SiO 5: Ce} such as silicate-based phosphor of yttrium, yttrium (although oxide based phosphor comprising Y) into the host crystal and the like, with time of the emission luminance particularly resulting phosphor film Terbium-activated yttrium aluminate green light-emitting phosphor (Y 3 Al 5
O 12 : Tb) or cerium-activated yttrium silicate blue light-emitting phosphor (Y 2 SiO 5 : Ce) is recommended.
【００１８】なお、本発明のＦＥＤ用蛍光膜を製造する
際、上述のように混合蛍光体からなる蛍光膜とする場合
においても、また、２層の蛍光膜を積層する場合もに
も、用いられる上記各酸化物系蛍光体及び硫化物系蛍光
体の組み合わせは、両者共に出来るだけ発光色の近い蛍
光体同士が組み合わせて用いられることはいうまでもな
い。When the fluorescent film for FED of the present invention is manufactured, it is used not only when the fluorescent film is made of a mixed phosphor as described above, but also when two fluorescent films are laminated. Needless to say, the above-described combinations of the respective oxide-based phosphors and sulfide-based phosphors are used in combination with phosphors having emission colors as close as possible.
【００１９】一方、本発明のＦＥＤは、上記のＦＥＤ用
蛍光膜が電界放出用カソードと対面する蛍光面として用
いられる以外は従来のＦＥＤと同様である。図１は本発
明のＦＥＤの概略断面図を示したものであり、一対のガ
ラス基板６、７をおよそ２ｍｍの間隙でもって対向配置
し、一方のガラス基板６の片面（ガラス基板７と対面す
る側）にカソード電極２と、これに通ずるカソード１を
所定の位置に点在させて設けるとともに、もう一方のガ
ラス基板７の片面には表面にＩＴＯ等の透明導電材でも
ってつくられたアノード電極３が設けられており、この
アノード電極３の上に蛍光膜４を形成する。この蛍光膜
４は、カラーＦＥＤの場合、青色発光蛍光体からなる青
色蛍光膜４ｂ、赤色発光蛍光体からなる赤色蛍光膜４
ｂ、緑色発光蛍光体からなる緑色蛍光膜４ｇの各画素毎
に別々に形成される。On the other hand, the FED of the present invention is the same as the conventional FED, except that the above-described FED phosphor film is used as a phosphor screen facing the field emission cathode. FIG. 1 is a schematic cross-sectional view of an FED of the present invention, in which a pair of glass substrates 6 and 7 are opposed to each other with a gap of about 2 mm, and one surface of one glass substrate 6 (facing the glass substrate 7). Side), a cathode electrode 2 and a cathode 1 communicating with the cathode electrode 2 are provided at predetermined positions, and an anode electrode made of a transparent conductive material such as ITO on the surface is provided on one surface of the other glass substrate 7. A fluorescent film 4 is formed on the anode electrode 3. In the case of a color FED, the fluorescent film 4 includes a blue fluorescent film 4b made of a blue light emitting phosphor and a red fluorescent film 4 made of a red light emitting phosphor.
b, a green phosphor film 4g made of a green light-emitting phosphor is formed separately for each pixel.
【００２０】なお、ガラス基板７の側から観測されるタ
イプのＦＥＤの場合（即ち、蛍光膜４の発光を電子源側
とは反対の側から取り出すタイプの場合）、蛍光膜４の
表面（電子源側の表面）には蛍光膜全体にアルミニュー
ムの薄膜層（アルミバック反射層）を形成しておくと蛍
光膜４からの発光を効率よく観察面へ反射すると共に、
電子線のチャージアップ防止効果も得られるので好まし
い。図１において５は各カソード１から放出される電子
線をホーカスするためのゲート電極であり、８はこのゲ
ート電極５とカソード電極２とを絶縁するための絶縁体
であり、これらの各画素が真空外囲器（図示せず）の中
に封入されて、その内部はおよそ１０−７〜１０−８Ｔ
ｏｒｒの真空度に保たれている。そして、アノード３と
ゲート電極５に一定の電圧を印加することによって各カ
ソード１から電子線を引き出し、アノード３に印加され
た電圧よって加速されて、その上に形成されている各蛍
光膜４（４ｂ、４ｒ、４ｇ）に到達して蛍光膜４を発光
させる。In the case of the FED of the type observed from the glass substrate 7 side (that is, the type in which light emitted from the fluorescent film 4 is extracted from the side opposite to the electron source side), the surface of the fluorescent film 4 (electrons). If an aluminum thin film layer (aluminum back reflection layer) is formed on the entire fluorescent film on the surface on the source side), light emitted from the fluorescent film 4 is efficiently reflected to the observation surface, and
This is preferable because an effect of preventing charge-up of electron beams can be obtained. In FIG. 1, reference numeral 5 denotes a gate electrode for focusing an electron beam emitted from each cathode 1. Reference numeral 8 denotes an insulator for insulating the gate electrode 5 and the cathode electrode 2 from each other. Enclosed in a vacuum envelope (not shown), the interior of which is approximately 10 -7 to 10 -8 T
The vacuum is maintained at orr. An electron beam is extracted from each cathode 1 by applying a constant voltage to the anode 3 and the gate electrode 5, accelerated by the voltage applied to the anode 3, and accelerated by each of the fluorescent films 4 ( 4b, 4r, and 4g) to cause the fluorescent film 4 to emit light.
【００２１】[0021]
【実施例】次に実施例により本発明を説明する。 （実施例１〜４）水ガラスの１％水溶液２００ｃｃの入
った底面積１００ｃｍ２の容器を４個用意し、支持体と
して表面にＩＴＯの透明導電膜が塗布されたガラス基板
を各容器の器底に沈ませておくと共に、これら各容器
に、銅及びアルミニウム付活硫化亜鉛緑色発光蛍光体
（ＺｎＳ：Ｃｕ，Ａｌ）各１ｇとテルビウム付活アルミ
ン酸イットリウム緑色発光蛍光体（Ｙ３Ａｌ５Ｏ１２：
Ｔｂ）をそれぞれ０．１ｇ、０．３ｇ、０．５ｇ及び
０．７ｇとを秤取して投入し、それぞれの混合比が異な
るＺｎＳ：Ｃｕ，ＡｌとＹ３Ａｌ５Ｏ１２：Ｔｂとの混
合蛍光体をそれぞれ懸濁させた蛍光体スラリーを調製
し、この蛍光体スラリーをマグネチックスターラで十分
に攪拌、混合しながら、それぞれの容器に酢酸バリウム
０．５％の水溶液２０ｃｃ添加して更に撹拌、混合した
後、静置して ガラス基板上に混合蛍光体を沈積させて
からデカンテーシヨンによって蛍光体懸濁液の上澄み液
を除去し、更に混合蛍光体が沈積した各ガラス基板を取
り出して乾燥させた。Next, the present invention will be described by way of examples. (Examples 1 to 4) Four containers having a bottom area of 100 cm 2 containing 200 cc of a 1% aqueous solution of water glass were prepared, and a glass substrate having a surface coated with a transparent conductive film of ITO was used as a support. The container is settled on the bottom, and 1 g of each of copper and aluminum activated zinc sulfide green light emitting phosphor (ZnS: Cu, Al) and terbium activated yttrium aluminate green light emitting phosphor (Y 3 Al 5 O) are placed in each of these containers. 12 :
0.1 g, 0.3 g, 0.5 g and 0.7 g of Tb) were weighed and charged, respectively, and ZnS: Cu, Al and Y 3 Al 5 O 12 : Tb having different mixing ratios were mixed. A phosphor slurry in which each of the mixed phosphors is suspended is prepared, and the phosphor slurry is sufficiently stirred and mixed with a magnetic stirrer, and 20 cc of a 0.5% barium acetate aqueous solution is added to each container. After stirring and mixing, the mixture is allowed to stand, the mixed phosphor is deposited on the glass substrate, the supernatant of the phosphor suspension is removed by decantation, and each glass substrate on which the mixed phosphor is deposited is taken out. And dried.
【００２２】このようにして、実施例１〜４の緑色発光
蛍光体からなる４種類の蛍光膜を得た。得られた各蛍光
膜に加速電圧５ｋＶ、加速電流２００μＡの電子線を６
時間連続して照射し、その時の電子線照射開始直後の発
光輝度（初期輝度ａ）、発光色度点（ｘ，ｙ）、経時後
の発光輝度｛照射開始から６時間後における発光輝度、
（ｂ）｝及び発光輝度維持率（ｂ／ａ×１００）をそれ
ぞれ測定並びに算出し、その結果を酸化物系蛍光体混合
量（用いた硫化物系蛍光体に対する酸化物系蛍光体の重
量百分率）と共に表１に示した。なお、各発光輝度
（ａ）及び（ｂ）は全て下記比較例１の蛍光膜の初期輝
度（ａ）を１００とした時の相対値で示してある。In this way, four types of fluorescent films made of the green light emitting phosphors of Examples 1 to 4 were obtained. An electron beam with an acceleration voltage of 5 kV and an acceleration current of 200 μA was
Irradiation for a continuous time, the emission luminance immediately after the start of the electron beam irradiation (initial luminance a), the emission chromaticity point (x, y), the emission luminance after elapse ｛the emission luminance after 6 hours from the irradiation start,
(B)｝ and emission luminance maintenance ratio (b / a × 100) were measured and calculated, respectively, and the result was calculated as the oxide-based phosphor mixture amount (weight percentage of oxide-based phosphor relative to sulfide-based phosphor used). ) Are shown in Table 1. Note that each of the emission luminances (a) and (b) is shown as a relative value when the initial luminance (a) of the phosphor film of Comparative Example 1 is 100.
【００２３】（比較例１）蛍光体として混合蛍光体では
なく銅及びアルミニウム付活硫化亜鉛緑色発光蛍光体
（ＺｎＳ：Ｃｕ，Ａｌ）のみを用いた以外は実施例１〜
４と同様にして比較例１の蛍光膜を得た。次いで実施例
１〜４と同一の条件でこの蛍光膜の電子線照射開始直後
の発光輝度（ａ）、発光色度点（ｘ，ｙ）、照射開始か
ら６時間後における発光輝度（ｂ）及び発光輝度維持率
（ｂ／ａ×１００）をそれぞれ測定並びに算出し、その
結果を表１に示した。(Comparative Example 1) Examples 1 to 3 except that only a copper- and aluminum-activated zinc sulfide green luminescent phosphor (ZnS: Cu, Al) was used instead of a mixed phosphor as a phosphor.
In the same manner as in Example 4, a fluorescent film of Comparative Example 1 was obtained. Next, under the same conditions as in Examples 1 to 4, the emission luminance (a) immediately after the start of electron beam irradiation, the emission chromaticity point (x, y), the emission luminance (b) 6 hours after the start of the irradiation, and The emission luminance maintenance ratio (b / a × 100) was measured and calculated, and the results are shown in Table 1.
【００２４】[0024]
【表１】 [Table 1]
【００２５】（実施例５〜８）水ガラスの１％水溶液２
００ｃｃの入った底面積１００ｃｍ２の容器を４個用意
し、支持体として表面にＩＴＯの透明導電膜が塗布され
たガラス基板を各容器の器底に沈ませておくと共に、こ
れら各容器に、銀及びアルミニウム付活硫化亜鉛青色発
光蛍光体（ＺｎＳ：Ａｇ，Ａｌ）各１ｇとセリウム付活
珪酸イットリウム青色発光蛍光体（Ｙ２Ｓｉ５Ｏ１２：
Ｃｅ）をそれぞれ０．１ｇ、０．３ｇ、０．５ｇ及び
０．７ｇとを秤取して投入し、それぞれの混合比が異な
るＺｎＳ：Ａｇ，ＡｌとＹ２Ｓｉ５Ｏ１２：Ｃｅとの混
合蛍光体スラリーを調製し、これの蛍光体スラリーをマ
グネチックスターラで十分に撹拌、混合しながら、それ
ぞれの容器に酢酸バリウム０．５％の水溶液２０ｃｃ添
加して更に撹拌、混合した後、生成した凝集沈降を、静
置し、デカンテーションによって上澄み液を除去し、更
に混合蛍光体が沈積した各ガラスピースを取り出して乾
燥させた。Examples 5 to 8 1% aqueous solution of water glass 2
Four containers having a bottom area of 100 cm 2 each containing 00 cc were prepared, and a glass substrate having a transparent conductive film of ITO coated on the surface thereof as a support was sunk on the bottom of each container. Silver and aluminum activated zinc sulfide blue light emitting phosphor (ZnS: Ag, Al) 1 g each and cerium activated yttrium silicate blue light emitting phosphor (Y 2 Si 5 O 12 :
0.1 g, 0.3 g, 0.5 g and 0.7 g of Ce) were weighed and charged, respectively, and ZnS: Ag, Al and Y 2 Si 5 O 12 : Ce were mixed at different mixing ratios. A mixed phosphor slurry was prepared, and while thoroughly stirring and mixing the phosphor slurry with a magnetic stirrer, 20 cc of a 0.5% barium acetate aqueous solution was added to each container, and further stirred and mixed. The aggregated sediment was allowed to stand, the supernatant was removed by decantation, and each glass piece on which the mixed phosphor was deposited was taken out and dried.
【００２６】このようにして、実施例５〜８の青色発光
蛍光体からなる４種類の蛍光膜を得た。得られた各蛍光
膜に加速電圧５ｋＶ、加速電流２００μＡの電子線を６
時間連続して照射し、その時の電子線照射開始直後の発
光輝度（初期輝度ａ）、発光色度点（ｘ，ｙ）、経時後
の発光輝度｛照射開始から６時間後における発光輝度、
（ｂ）｝及び発光輝度維持率（ｂ／ａ×１００）をそれ
ぞれ測定並びに算出し、その結果を酸化物系蛍光体混合
量（用いた硫化物系蛍光体に対する酸化物系蛍光体の重
量百分率）と共に表２に示した。なお、各発光輝度
（ａ）及び（ｂ）は全て下記比較例２の蛍光膜の初期輝
度（ａ）を１００とした時の相対値で示してある。In this way, four types of fluorescent films composed of the blue light emitting phosphors of Examples 5 to 8 were obtained. An electron beam with an acceleration voltage of 5 kV and an acceleration current of 200 μA was
Irradiation for a continuous time, the emission luminance immediately after the start of the electron beam irradiation (initial luminance a), the emission chromaticity point (x, y), the emission luminance after elapse ｛the emission luminance after 6 hours from the irradiation start,
(B)｝ and emission luminance maintenance ratio (b / a × 100) were measured and calculated, respectively, and the result was calculated as the oxide-based phosphor mixture amount (weight percentage of oxide-based phosphor relative to sulfide-based phosphor used). ) Are shown in Table 2. In addition, each of the emission luminances (a) and (b) is shown as a relative value when the initial luminance (a) of the phosphor film of Comparative Example 2 below is set to 100.
【００２７】（比較例２）蛍光体として銅及びアルミニ
ウム付活硫化亜鉛緑色発光蛍光体（ＺｎＳ：Ｃｕ，Ａ
ｌ）に代えて銀及びアルミニウム付活硫化亜鉛青色発光
蛍光体（ＺｎＳ：Ａｇ，Ａｌ）を用いた以外は比較例１
と同様にして比較例２の蛍光膜を得た。次いで実施例１
〜４と同一の条件でこの蛍光膜の電子線照射開始直後の
発光輝度（ａ）、発光色度点（ｘ，ｙ）、照射開始から
６時間後における発光輝度（ｂ）及び発光輝度維持率
（ｂ／ａ×１００）をそれぞれ測定並びに算出し、その
結果を表１に示した。(Comparative Example 2) A copper and aluminum activated zinc sulfide green light-emitting phosphor (ZnS: Cu, A
Comparative Example 1 except that silver and aluminum activated zinc sulfide blue light emitting phosphor (ZnS: Ag, Al) was used in place of l)
In the same manner as in the above, a fluorescent film of Comparative Example 2 was obtained. Next, Example 1
The emission luminance (a), the emission chromaticity point (x, y), the emission luminance (b) and the emission luminance maintenance rate of the phosphor film immediately after the start of the electron beam irradiation under the same conditions as those of (1) to (4). (B / a × 100) was measured and calculated, and the results are shown in Table 1.
【００２８】[0028]
【表２】 [Table 2]
【００２９】表１及び表２からわかるように、硫化物系
蛍光体のみからなる蛍光膜（比較例１の蛍光膜）に較べ
て、これにイットリウムを含む酸化物系蛍光体を混合し
た、混合蛍光体を用いた蛍光膜（各実施例の蛍光膜）は
６時間連続して発光させた場合の発光輝度の低下が少な
く、輝度維持率が著しく改善されており、しかも、混合
蛍光体中における酸化物系蛍光体の含有量を少なくする
と、この混合蛍光体からなる蛍光膜の経時後の輝度維持
率は低下するものの、酸化物系蛍光体の含有量の割には
輝度維持率の低下度が少なく、硫化物系蛍光体に酸化物
系蛍光体を混合することによって、経時後の輝度維持率
という点に着目した場合、意外にも、単なる相和効果で
はなく、明らかに相乗効果が付与されていることがわか
る。As can be seen from Tables 1 and 2, compared to the phosphor film comprising only the sulfide phosphor (the phosphor film of Comparative Example 1), the oxide phosphor containing yttrium was mixed therewith. The phosphor film using the phosphor (the phosphor film of each example) has a small decrease in emission luminance when light is continuously emitted for 6 hours, has a remarkably improved luminance maintenance ratio, and has an improved light emission property in the mixed phosphor. When the content of the oxide-based phosphor is reduced, the luminance maintenance ratio of the phosphor film formed of the mixed phosphor after aging decreases, but the degree of decrease in the luminance maintenance ratio is higher than the content of the oxide-based phosphor. When focusing on the luminance retention rate after aging by mixing oxide-based phosphors with sulfide-based phosphors, surprisingly, not only a simple synergistic effect but a clear synergistic effect is added. You can see that it is done.
【００３０】また、酸化物系蛍光体を混合しても発光色
の変化は意外に少なく、硫化物系蛍光体の持つ良好な色
純度特性が保たれていた。更に本発明の蛍光膜を用いた
ＦＥＤも連続動作時の発光輝度の輝度維持率が著しく改
善されていた。Further, even when the oxide-based phosphor was mixed, the change in the emission color was surprisingly small, and the excellent color purity characteristics of the sulfide-based phosphor were maintained. Further, the FED using the phosphor film of the present invention also has a remarkably improved luminance maintenance ratio of the emission luminance during continuous operation.
【００３１】（実施例９〜１２）銅及びアルミニウム付
活硫化亜鉛緑色発光蛍光体（ＺｎＳ：Ｃｕ，Ａｌ）３０
ｇとエチルセルロース樹脂５ｇとジエチルカルビトール
（溶剤）１０ｇとを混合して十分に混練した蛍光体ペー
ストを調製し、これを表面にＩＴＯの透明導電性膜が形
成されているガラス板上にスクリーン印刷法で塗布した
後、これを１００℃で乾燥し、次いでこの上にテルビウ
ム付活アルミン酸イットリウム緑色発光蛍光体（Ｙ３Ａ
ｌ５Ｏ１２：Ｔｂ）を上記と同様にして別の印刷スクリ
ーン版で塗布し、乾燥させた後、更にこれを４５０℃で
１時間ベーキングして有機成分を熱分解、飛散させて、
ガラス板上に乾燥後の膜厚が１０μｍのＺｎＳ：Ｃｕ，
Ａｌからなる蛍光体層と、乾燥後の膜厚が５μｍのＹ３
Ａｌ５Ｏ１２：Ｔｂからなる蛍光体層とをこの順に積層
させた、蛍光体層が二層構造を有する実施例９のＦＥＤ
用蛍光膜を製造した。(Examples 9 to 12) Copper and aluminum activated zinc sulfide green light-emitting phosphor (ZnS: Cu, Al) 30
g, 5 g of ethylcellulose resin, and 10 g of diethyl carbitol (solvent) to prepare a well-kneaded phosphor paste, and screen-print this on a glass plate having a transparent conductive film of ITO formed on the surface. After coating by a method, this is dried at 100 ° C., and then a terbium-activated yttrium aluminate green light-emitting phosphor (Y 3 A
l 5 O 12 : Tb) was applied on another printing screen in the same manner as described above, dried and baked at 450 ° C. for 1 hour to thermally decompose and disperse the organic components.
ZnS: Cu, having a thickness of 10 μm after drying on a glass plate,
A phosphor layer made of Al and Y 3 having a thickness of 5 μm after drying.
The FED of Example 9 in which a phosphor layer having a two-layer structure is formed by laminating a phosphor layer made of Al 5 O 12 : Tb in this order.
A fluorescent film was manufactured.
【００３２】また、これとは別に、乾燥後におけるＺｎ
Ｓ：Ｃｕ，Ａｌからなる蛍光体層とＹ３Ａｌ５Ｏ１２：
Ｔｂからなる蛍光体層の膜厚の比をそれぞれ１０：３、
１０：５及び１：１とする以外は実施例９の蛍光膜と同
様にして、ガラス支持体上にＺｎＳ：Ｃｕ，Ａｌからな
る蛍光体層とＹ３Ａｌ５Ｏ１２：Ｔｂからなる蛍光体層
とをこの順に積層させた、蛍光体層が二層構造を有する
実施例１０〜１２のＦＥ用蛍光膜をそれぞれ得た。Separately, Zn after drying
S: Phosphor layer made of Cu and Al and Y 3 Al 5 O 12 :
The ratio of the thickness of the phosphor layer made of Tb is 10: 3, respectively.
A phosphor layer made of ZnS: Cu, Al and a phosphor made of Y 3 Al 5 O 12 : Tb are formed on a glass support in the same manner as the phosphor film of Example 9 except that the ratio is set to 10: 5 and 1: 1. The FE phosphor films of Examples 10 to 12 in which the phosphor layers had a two-layer structure in which the layers were laminated in this order were obtained.
【００３３】得られた各蛍光膜に加速電圧５ｋＶ、加速
電流２００μＡの電子線を６時間連続して照射し、その
時の電子線照射開始直後の発光輝度（初期輝度ａ）、発
光色度点（ｘ，ｙ）、経時後の発光輝度｛照射開始から
６時間後における発光輝度、（ｂ）｝及び発光輝度維持
率（ｂ／ａ×１００）をそれぞれ測定並びに算出し、そ
の結果を蛍光体層厚比（硫化物系蛍光体からなる蛍光体
層の厚みに対する酸化物系蛍光体からなる蛍光体層の厚
みの相対百分率）と共に表３に示した。なお、各蛍光膜
の発光輝度（ａ）及び（ｂ）は全て下記比較例３の蛍光
膜の初期輝度（ａ）を１００とした時の相対値で示して
ある。Each of the obtained fluorescent films is continuously irradiated with an electron beam having an accelerating voltage of 5 kV and an accelerating current of 200 μA for 6 hours. At this time, the emission luminance immediately after the start of the electron beam irradiation (initial luminance a) and the emission chromaticity point ( x, y), the emission luminance after lapse of time {the emission luminance after 6 hours from the start of irradiation, (b)} and the emission luminance maintenance ratio (b / a × 100) were measured and calculated, and the results were used as the phosphor layer. The results are shown in Table 3 together with the thickness ratio (the relative percentage of the thickness of the phosphor layer composed of the oxide phosphor to the thickness of the phosphor layer composed of the sulfide phosphor). Note that the emission luminances (a) and (b) of the respective fluorescent films are all shown as relative values when the initial luminance (a) of the fluorescent film of Comparative Example 3 is 100.
【００３４】（比較例３）蛍光体として銅及びアルミニ
ウム付活硫化亜鉛緑色発光蛍光体（ＺｎＳ：Ｃｕ，Ａ
ｌ）を用いた蛍光体ペーストのみを用い、実施例９の蛍
光膜と同様に印刷法により、乾燥後の膜厚が１５μｍで
ある、ＺｎＳ：Ｃｕ，Ａｌからなる単一蛍光体層を有す
る比較例４の蛍光膜を製造した。(Comparative Example 3) Copper and aluminum activated zinc sulfide green light-emitting phosphor (ZnS: Cu, A)
1) Comparison of a single phosphor layer made of ZnS: Cu, Al having a thickness of 15 μm after drying by a printing method using only the phosphor paste of Example 9 and the phosphor film of Example 9. The phosphor film of Example 4 was manufactured.
【００３５】次いで実施例９〜１２の蛍光膜と同一の条
件でこの蛍光膜の電子線照射開始直後の発光輝度
（ａ）、発光色度点（ｘ，ｙ）、照射開始から６時間後
における発光輝度（ｂ）及び発光輝度維持率（ｂ／ａ×
１００）をそれぞれ測定並びに算出し、その結果を表３
に示した。Next, under the same conditions as those of the phosphor films of Examples 9 to 12, the light emission luminance (a) and the light emission chromaticity point (x, y) of the phosphor film immediately after the start of the electron beam irradiation, and 6 hours after the start of the irradiation. Light emission luminance (b) and light emission luminance maintenance rate (b / a ×
100) were measured and calculated, and the results were shown in Table 3.
It was shown to.
【００３６】[0036]
【表３】 [Table 3]
【００３７】（実施例１３、１４）、（比較例４） アノード上に実施例１及び実施例５の蛍光膜を形成する
以外は従来のＦＥＤと同様にして実施例１３のＦＥＤ及
び実施例１４のＦＥＤを製造した。これとは別に比較例
１の蛍光膜を形成する以外は実施例１３及び実施例１４
のＦＥＤと同様にして比較例４のＦＥＤを製造した。こ
れら各ＦＥＤを５Ｋｖ、２００μＡの加速電圧で動作さ
せたところ、実施例１３及び実施例１４のＦＥＤの６時
間後の発光輝度は動作直後の発光輝度に対してそれぞれ
９５％及び８７％であったのに対し、比較例４の６時間
後の発光輝度は動作直後の発光輝度に対して６０％であ
った。(Examples 13 and 14), (Comparative Example 4) The FED of Example 13 and the Example 14 were manufactured in the same manner as the conventional FED, except that the fluorescent films of Examples 1 and 5 were formed on the anode. Was manufactured. Example 13 and Example 14 except that the fluorescent film of Comparative Example 1 was formed separately.
The FED of Comparative Example 4 was manufactured in the same manner as the FED of Comparative Example 4. When these FEDs were operated at an acceleration voltage of 5 Kv and 200 μA, the light emission luminances of the FEDs of Examples 13 and 14 after 6 hours were 95% and 87%, respectively, with respect to the light emission luminance immediately after the operation. On the other hand, the light emission luminance of Comparative Example 4 after 6 hours was 60% of the light emission luminance immediately after the operation.
【００３８】[0038]
【発明の効果】本発明のＦＥＤ用蛍光膜及びこれを用い
たＦＥＤは上述のような構成としたので輝度維持率が改
善され、長時間の使用によっても発光輝度の低下の程度
が小さく、硫化物系蛍光体の持つ高輝度な発光と良好な
色純度を長時間維持することが出来る。As described above, the fluorescent film for FED of the present invention and the FED using the same have an improved luminance maintenance ratio, a small decrease in the luminance even after a long use, It is possible to maintain the high-luminance light emission and good color purity of the physical phosphor for a long time.
図１は本発明のＦＥＤの概略断面を示す図面である。 １…………カソード ２…………カソー
ド電極 ３…………アノード電極 ４…………蛍光膜 ５…………ゲート電極 ６、７………ガラ
ス基板 ８…………絶縁体FIG. 1 is a drawing showing a schematic cross section of the FED of the present invention. DESCRIPTION OF SYMBOLS 1 ... Cathode 2 ... Cathode electrode 3 ... Anode electrode 4 ... Fluorescent film 5 ... Gate electrode 6, 7 ... Glass substrate 8 ... Insulator
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０９Ｋ 11/79 ＣＰＲ Ｃ０９Ｋ 11/79 ＣＰＲ 11/80 ＣＰＭ 11/80 ＣＰＭ Ｇ０９Ｆ 9/30 ３６０ Ｇ０９Ｆ 9/30 ３６０ Ｈ０１Ｊ 29/20 Ｈ０１Ｊ 29/20 31/12 31/12 Ｃ Ｈ０４Ｎ 5/68 Ｈ０４Ｎ 5/68 Ｂ Ｆターム(参考） 4H001 CA08 XA08 XA13 XA14 XA16 XA30 XA39 YA13 YA29 YA47 YA58 YA65 5C036 CC02 CC03 CC04 CC18 EE01 EF01 EF06 EF09 EG36 EH14 5C058 AA05 5C094 AA08 AA10 AA31 BA11 BA32 BA34 CA18 CA23 DA13 DB10 EA04 EA05 ED20 FA01 FA02 FB02 FB03 FB20 GA10 JA01 JA03 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C09K 11/79 CPR C09K 11/79 CPR 11/80 CPM 11/80 CPM G09F 9/30 360 G09F 9/30 360 H01J 29/20 H01J 29/20 31/12 31/12 C H04N 5/68 H04N 5/68 BF term (reference) 4H001 CA08 XA08 XA13 XA14 XA16 XA30 XA39 YA13 YA29 YA47 YA58 YA65 5C036 CC02 CC03 CC04 CC18 EE01 EF01 EF06 EF09 EG36 EH14 5C058 AA05 5C094 AA08 AA10 AA31 BA11 BA32 BA34 CA18 CA23 DA13 DB10 EA04 EA05 ED20 FA01 FA02 FB02 FB03 FB20 GA10 JA01 JA03
Claims (7)
のアルミン酸塩系もしくは珪酸塩系蛍光体である酸化物
系蛍光体との混合蛍光体からなる蛍光体層を設けてなる
ことを特徴とする電界放出型ディスプレイ用蛍光膜。1. A phosphor layer comprising a mixed phosphor of a sulfide phosphor and an oxide phosphor which is an aluminate or silicate phosphor of yttrium is provided on a support. Characteristic phosphor film for field emission display.
蛍光体に対する上記酸化物系蛍光体の混合比が５〜８０
重量％であることを特徴とする請求項１に記載の電界放
出型ディスプレイ用蛍光膜。2. A mixing ratio of said oxide phosphor to said sulfide phosphor in said mixed phosphor is from 5 to 80.
The phosphor film of claim 1, wherein the phosphor layer is in a weight percent.
層と、イットリウムのアルミン酸塩系もしくは珪酸塩系
蛍光体である酸化物系蛍光体からなる蛍光体層とをこの
順に積層してなることを特徴とする電界放出型ディスプ
レイ用蛍光膜。3. A phosphor layer comprising a sulfide phosphor and a phosphor layer comprising an oxide phosphor which is an yttrium aluminate or silicate phosphor are laminated on a support in this order. A phosphor film for a field emission display, comprising:
みが、上記硫化物系蛍光体からなる蛍光体層の厚みの
０．０５〜２倍であることを特徴とする請求項３に記載
の電界放出型ディスプレイ用蛍光膜。4. The phosphor layer made of the oxide-based phosphor has a thickness of 0.05 to 2 times the thickness of the phosphor layer made of the sulfide-based phosphor. 3. The phosphor film for a field emission display according to claim 1.
付活硫化亜鉛緑色発光蛍光体（ＺｎＳ：Ｃｕ，Ａｌ）で
あり、上記酸化物系蛍光体がテルビウム付活アルミン酸
イットリウム緑色発光蛍光体（Ｙ３Ａｌ５Ｏ１２：Ｔ
ｂ）であることを特徴とする請求項１〜４のいずれか一
項に記載の電界放出型ディスプレイ用蛍光膜。5. The sulfide-based phosphor is a copper- and aluminum-activated zinc sulfide green-emitting phosphor (ZnS: Cu, Al), and the oxide-based phosphor is a terbium-activated yttrium aluminate green-emitting phosphor. (Y 3 Al 5 O 12 : T
The phosphor film for a field emission display according to any one of claims 1 to 4, wherein b) is used.
付活硫化亜鉛青色発光蛍光体（ＺｎＳ：Ａｇ，Ａｌ）で
あり、上記酸化物系蛍光体がセリウム付活珪酸イットリ
ウム青色発光蛍光体（Ｙ２ＳｉＯ５：Ｃｅ）であること
を特徴とする請求項１〜４のいずれか一項に記載の電界
放出型ディスプレイ用蛍光膜。6. The sulfide-based phosphor is a silver- and aluminum-activated zinc sulfide blue-emitting phosphor (ZnS: Ag, Al), and the oxide-based phosphor is a cerium-activated yttrium silicate blue-emitting phosphor ( The phosphor film for a field emission display according to claim 1, wherein the phosphor film is Y 2 SiO 5 : Ce).
ードと、これに対向するアノードと、該アノードの上記
カソード側に設けられた蛍光膜とを有し、上記カソード
から放出される加速電圧０．１〜１５ｋＶの電子線によ
って上記蛍光膜を発光させる電界放出型ディスプレイ装
置において、上記蛍光膜が請求項１〜６のいずれか一項
に記載の蛍光膜からなることを特徴とする電界放出型デ
ィスプレイ装置。7. An accelerating voltage emitted from a cathode having at least a field emission cathode in a vacuum envelope, an anode facing the cathode, and a fluorescent film provided on the cathode side of the anode. A field emission display device in which the phosphor film emits light by an electron beam of 0.1 to 15 kV, wherein the phosphor film is formed of the phosphor film according to any one of claims 1 to 6. Type display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10303153A JP2000096046A (en) | 1998-09-18 | 1998-09-18 | Fluorescent screen for field emission display and field emission display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10303153A JP2000096046A (en) | 1998-09-18 | 1998-09-18 | Fluorescent screen for field emission display and field emission display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000096046A true JP2000096046A (en) | 2000-04-04 |
Family
ID=17917526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10303153A Pending JP2000096046A (en) | 1998-09-18 | 1998-09-18 | Fluorescent screen for field emission display and field emission display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000096046A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6791253B2 (en) | 2001-10-16 | 2004-09-14 | Hitachi, Ltd. | Display |
| US6876142B2 (en) | 2002-07-10 | 2005-04-05 | Hitachi, Ltd. | Faceplate having specific phosphor |
| CN1321432C (en) * | 2002-10-10 | 2007-06-13 | 株式会社日立显示器 | Display device |
| KR100965544B1 (en) * | 2003-11-29 | 2010-06-23 | 삼성에스디아이 주식회사 | Phosphor for flat panel display device |
| JP2011028228A (en) * | 2009-06-30 | 2011-02-10 | Casio Computer Co Ltd | Light source device and projector |
-
1998
- 1998-09-18 JP JP10303153A patent/JP2000096046A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6791253B2 (en) | 2001-10-16 | 2004-09-14 | Hitachi, Ltd. | Display |
| US6876142B2 (en) | 2002-07-10 | 2005-04-05 | Hitachi, Ltd. | Faceplate having specific phosphor |
| CN1321432C (en) * | 2002-10-10 | 2007-06-13 | 株式会社日立显示器 | Display device |
| KR100965544B1 (en) * | 2003-11-29 | 2010-06-23 | 삼성에스디아이 주식회사 | Phosphor for flat panel display device |
| JP2011028228A (en) * | 2009-06-30 | 2011-02-10 | Casio Computer Co Ltd | Light source device and projector |
| US8434875B2 (en) | 2009-06-30 | 2013-05-07 | Casio Computer Co., Ltd. | Projector having light source unit including excitation light source, optical wheel, light emitting light source, and controller |
| US8757814B2 (en) | 2009-06-30 | 2014-06-24 | Casio Computer Co., Ltd. | Projector having light source unit including excitation light source, optical wheel, light emitting light source, and controller |
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