JP3503517B2 - Field emission device - Google Patents
Field emission deviceInfo
- Publication number
- JP3503517B2 JP3503517B2 JP05872599A JP5872599A JP3503517B2 JP 3503517 B2 JP3503517 B2 JP 3503517B2 JP 05872599 A JP05872599 A JP 05872599A JP 5872599 A JP5872599 A JP 5872599A JP 3503517 B2 JP3503517 B2 JP 3503517B2
- Authority
- JP
- Japan
- Prior art keywords
- added
- phosphor
- life
- emission
- field emission
- 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.)
- Expired - Fee Related
Links
Landscapes
- Luminescent Compositions (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エミッション寿命
の良好な電界放出素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field emission device having a good emission life.
【０００２】[0002]
【従来の技術】図６にＦＥＤ(Field Emission Display)
の断面図を示す。ＦＥＤは、内部が高真空状態とされた
薄型パネル状の外囲器１００を有している。この外囲器
１００は、陰極基板１０１と陽極基板１０２を微小な間
隔をおいて対面させ、両基板１０１，１０２の各外周の
間にスペーサ部材を設けて封着した構造となっている。
この外囲器１００において、陽極基板１０２の内面に
は、陽極導体１０３と該陽極導体１０３の表面に設けら
れた蛍光体層１０４からなる陽極１０５が設けられてい
る。また、陰極基板１０１の内面には、電界放出形陰極
１１０が設けられている。電界放出形陰極１１０は、陰
極基板１０１の内面に設けられた陰極導体１１１と、陰
極導体１１１に設けられたコーン形状のエミッタ１１２
と、エミッタ１１２の先端に近接して設けられたゲート
電極１１３とを有している。陰極導体１１１とゲート電
極１１３は絶縁層１１４で絶縁されている。2. Description of the Related Art FIG. 6 shows an FED (Field Emission Display).
FIG. The FED has a thin panel-shaped envelope 100 whose inside is in a high vacuum state. The envelope 100 has a structure in which a cathode substrate 101 and an anode substrate 102 are opposed to each other with a minute gap therebetween, and a spacer member is provided between the outer peripheries of both substrates 101 and 102 to seal them.
In this envelope 100, an anode 105 composed of an anode conductor 103 and a phosphor layer 104 provided on the surface of the anode conductor 103 is provided on the inner surface of an anode substrate 102. A field emission cathode 110 is provided on the inner surface of the cathode substrate 101. The field emission cathode 110 includes a cathode conductor 111 provided on the inner surface of the cathode substrate 101 and a cone-shaped emitter 112 provided on the cathode conductor 111.
And a gate electrode 113 provided near the tip of the emitter 112. The cathode conductor 111 and the gate electrode 113 are insulated by the insulating layer 114.
【０００３】一般的なＦＥＤでは陽極に高電圧を印加し
ており、また輝度を高くするために電流密度を高く設定
している。さらに、ＦＥＤは薄型であることを特徴とし
ているため、陰極基板と陽極基板の間隔が狭く、陰極と
陽極の距離が近い。このため、陰極からの電子が射突し
た蛍光体の何らかの影響により、蛍光体の近くにある陰
極のエミッタが汚染されやすい。この傾向は４００Ｖ程
度以上の陽極電圧のＦＥＤにおいて特に顕著である。よ
って、ＦＥＤの陽極に用いられる蛍光体としては、陰極
に影響を与えにくいものが好ましい。In a general FED, a high voltage is applied to the anode, and the current density is set high in order to increase the brightness. Further, since the FED is characterized by being thin, the distance between the cathode substrate and the anode substrate is narrow, and the distance between the cathode and the anode is short. For this reason, the emitter of the cathode near the phosphor is likely to be contaminated due to some influence of the phosphor hit by electrons from the cathode. This tendency is particularly remarkable in the FED having an anode voltage of about 400 V or higher. Therefore, the phosphor used for the anode of the FED is preferably one that does not easily affect the cathode.
【０００４】[0004]
【発明が解決しようとする課題】ＺｎＯ：Ｚｎ蛍光体を
使用したモノクロ（単色）のＦＥＤのエミッション寿命
は良好であるが、Ｒ（赤）、Ｇ（緑）、Ｂ（青）の各色
に発光するカラー蛍光体を備えたフルカラー用ＦＥＤ
は、素子の寿命が短い等、信頼性の点で問題を有してい
る。この原因としては、電子線照射によって蛍光体から
酸化性のガスが放出され、これがエミッタに影響を及ぼ
していることが考えられる。The monochrome (monochromatic) FED using the ZnO: Zn phosphor has a good emission life, but emits light in each color of R (red), G (green) and B (blue). Full-color FED with color phosphor
Has a problem in reliability, such as a short device life. As a cause of this, it is considered that an oxidizing gas is released from the phosphor by the electron beam irradiation and this affects the emitter.
【０００５】本発明は、エミッタに悪影響を与えるガス
を放出しにくい蛍光体を備えているために寿命が良好な
電界放出素子を提供することを目的としている。It is an object of the present invention to provide a field emission device having a good life because it is provided with a phosphor that does not easily emit a gas that adversely affects the emitter.
【０００６】[0006]
【課題を解決するための手段】請求項１に記載された電
界放出素子は、平均粒径１μｍ以下の粉末であるＴｉＯ
2 を蛍光体に対して０．２〜１．０ｗｔ％添加したこと
を特徴としている。The field emission device according to claim 1 is a TiO 2 powder having an average particle size of 1 μm or less.
The feature is that 0.2 to 1.0 wt% of 2 is added to the phosphor .
【０００７】 請求項２に記載された電界放出素子は、
平均粒径１μｍ以下のＴｉＮ粉末を蛍光体に対して０．
２〜１．０ｗｔ％添加したことを特徴としている。The field emission device according to claim 2 is
TiN powder having an average particle size of 1 μm or less was added to the phosphor in an amount of 0.1
The feature is that 2 to 1.0 wt% is added .
【０００８】 請求項３に記載された電界放出素子は、
平均粒径１μｍ以下のＳｒＴｉＯ 3 粉末を蛍光体に対し
て０．２〜１．０ｗｔ％添加したことを特徴としてい
る。The field emission device according to claim 3 is
SrTiO 3 powder with an average particle size of 1 μm or less is used for the phosphor.
It is characterized by the addition of 0.2 to 1.0 wt% .
【０００９】[0009]
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【実施例】（１）実施例１
赤色発光蛍光体であるＹ2 Ｏ3 ：Ｅｕ蛍光体、緑色発光
の蛍光体であるＹＡＧＧ：Ｔｂ蛍光体、青色発光蛍光体
であるＹ2 ＳｉＯ5 ：Ｃｅ蛍光体に、Ｔｉ化合物として
のＴｉＯ2 をそれぞれ０．０１〜５ｗｔ％ずつ添加し
た。添加したＴｉＯ2 は平均粒径１μｍ以下の粉末であ
る。EXAMPLES (1) Example 1 Y 2 O 3 : Eu phosphor which is a red light emitting phosphor, YAGG: Tb phosphor which is a green light emitting phosphor, and Y 2 SiO 5 : Ce which is a blue light emitting phosphor. TiO 2 as a Ti compound was added to the phosphor in an amount of 0.01 to 5 wt%, respectively. The added TiO 2 is a powder having an average particle size of 1 μm or less.
【００１３】前記蛍光体をＦＥＤの陽極に実装して評価
を行った。ＦＥＤの構造は図６を参照して説明した従来
のものと同一である。点灯条件は、アノード電圧７００
Ｖである。比較用としてＴｉＯ2 を添加しない蛍光体を
用意して同様の条件で評価した。The phosphor was mounted on the anode of the FED and evaluated. The structure of the FED is the same as the conventional one described with reference to FIG. The lighting condition is anode voltage 700
V. For comparison, a phosphor not containing TiO 2 was prepared and evaluated under the same conditions.
【００１４】図１はＴｉＯ2 添加量と初期輝度相対値の
関係を示すグラフである。このグラフにおいて、横軸の
ＴｉＯ2 添加量が０の位置がＴｉＯ2 を添加しない比較
用の蛍光体を示しており（図中未添加と表示）、その時
の輝度を１００で表す。その他の点が実施例の蛍光体を
示す。FIG. 1 is a graph showing the relationship between the amount of TiO 2 added and the initial luminance relative value. In this graph, a position where the amount of TiO 2 added on the horizontal axis is 0 indicates a comparative phosphor in which TiO 2 is not added (indicated as “not added” in the figure), and the brightness at that time is represented by 100. The other points show the phosphors of the examples.
【００１５】図２は寿命試験におけるＴｉＯ2 添加量と
エミッション半減時間の関係を示すグラフである。この
グラフにおいて、ＴｉＯ2 を添加しない比較用の蛍光体
を未添加と示している。FIG. 2 is a graph showing the relationship between the amount of TiO 2 added and the emission half-life in the life test. In this graph, the comparative phosphor to which TiO 2 is not added is shown as not added.
【００１６】図３は、寿命試験前後のＦＥＤ外囲器内の
真空度相対値とＴｉＯ2 添加量の関係を示すグラフであ
る。このグラフにおいて、０ｗｔ％がＴｉＯ2 を添加し
ない比較用の蛍光体を示しており、その他が実施例の蛍
光体を示す。FIG. 3 is a graph showing the relationship between the relative vacuum degree inside the FED envelope and the amount of TiO 2 added before and after the life test. In this graph, 0 wt% shows the phosphor for comparison to which TiO 2 is not added, and the others show the phosphor of the example.
【００１７】図１〜図３に示した実験結果からわかるよ
うに、ＴｉＯ2 を添加すると初期輝度は添加量が増加す
るのに伴って低下する（図１参照）ものの、エミッショ
ン寿命特性においては０．０１％以上の添加でエミッシ
ョン半減時間が５００時間以上となり、未添加に比べて
効果が認められ、０．５ｗｔ％添加では未添加品の１０
倍のエミッション寿命となっている。なお、発光効率の
寿命特性は変わっていない。最適添加量の範囲は０．２
〜１．０ｗｔ％である。As can be seen from the experimental results shown in FIGS. 1 to 3, when TiO 2 is added, the initial luminance decreases as the addition amount increases (see FIG. 1), but the emission life characteristic is 0. Addition of 0.01% or more results in an emission half-time of 500 hours or more, and the effect is recognized as compared to the case where no addition is made.
It has twice the emission life. It should be noted that the life characteristics of luminous efficiency have not changed. The optimum range of addition is 0.2
~ 1.0 wt%.
【００１８】（２）実施例２
Ｔｉ化合物である平均粒径１μｍ以下のＴｉＮ粉末を、
実施例１と同様に蛍光体に添加してＦＥＤに実装して評
価を行った。(2) Example 2 TiN powder having a mean particle size of 1 μm or less, which is a Ti compound,
In the same manner as in Example 1, the phosphor was added and mounted on an FED for evaluation.
【００１９】図４はＴｉＮ添加量と輝度相対値の関係を
示すグラフである。このグラフにおいて、横軸のＴｉＮ
添加量が０の位置がＴｉＮを添加しない比較用の蛍光体
を示しており（図中未添加と表示）、その時の輝度を１
００で表す。その他の点が実施例の蛍光体を示す。FIG. 4 is a graph showing the relationship between the TiN addition amount and the relative brightness value. In this graph, TiN on the horizontal axis
The position where the added amount is 0 indicates a comparative phosphor in which TiN is not added (indicated as “not added” in the figure), and the brightness at that time is 1
Represented by 00. The other points show the phosphors of the examples.
【００２０】図５は寿命試験におけるＴｉＮ添加量とエ
ミッション半減時間の関係を示すグラフである。このグ
ラフにおいて、ＴｉＮを添加しない比較用の蛍光体を未
添加と示している。FIG. 5 is a graph showing the relationship between the amount of TiN added and the emission half-life in the life test. In this graph, the comparative phosphor to which TiN is not added is not added.
【００２１】図４及び図５に示した実験結果からわかる
ように、ＴｉＮを添加すると初期輝度は添加量が増加す
るのに伴って低下する（図４参照）ものの、エミッショ
ン寿命特性においては０．０１％以上の添加でエミッシ
ョン半減時間が未添加に比べて長くなり、効果が認めら
れる。０．５ｗｔ％添加では未添加品の１０倍のエミッ
ション寿命となっている。なお、発光効率の寿命特性は
変わっていない。最適添加量の範囲は０．２〜１．０ｗ
ｔ％である。As can be seen from the experimental results shown in FIGS. 4 and 5, when TiN is added, the initial luminance decreases as the addition amount increases (see FIG. 4), but the emission lifetime characteristics are less than 0. Addition of 01% or more makes the emission half-life longer than that without addition, and the effect is recognized. With 0.5 wt% addition, the emission life is 10 times that of the non-added product. It should be noted that the life characteristics of luminous efficiency have not changed. The optimum range of addition is 0.2-1.0w
t%.
【００２２】（３）実施例３
Ｔｉ化合物である平均粒径１μｍ以下のＳｒＴｉＯ3 粉
末を、実施例１と同様に蛍光体に添加してＦＥＤに実装
して評価を行った。その結果、図７に示した実験結果か
らわかるように第１乃至第２実施例と略同様の結果が得
られ、ＳｒＴｉＯ3 を添加すると初期輝度は添加量が増
加するのに伴って低下するものの、エミッション寿命特
性においては０．０１％以上の添加で効果が認められ、
０．５ｗｔ％添加では未添加品の１０倍のエミッション
寿命となった。なお、発光効率の寿命特性は変わらず、
最適添加量の範囲は０．２〜１．０ｗｔ％であった。(3) Example 3 SrTiO 3 powder having a mean particle size of 1 μm or less, which is a Ti compound, was added to a phosphor as in Example 1 and mounted on an FED for evaluation. As a result, as can be seen from the experimental results shown in FIG. 7, substantially the same results as those of the first and second examples were obtained, and when SrTiO 3 was added, the initial luminance decreased as the addition amount increased. In terms of emission life characteristics, addition of 0.01% or more is effective,
When 0.5 wt% was added, the emission life was 10 times that of the non-added product. In addition, the life characteristics of luminous efficiency are not changed,
The optimum addition amount range was 0.2 to 1.0 wt%.
【００２３】[0023]
【発明の効果】本発明のＦＥＤによれば、陽極の蛍光体
に請求項記載のＴｉ化合物を添加した。このため、ＦＥ
Ｄの駆動中に蛍光体等からＣＯ2 やＨ2 Ｏ等のガスが発
生しても、蛍光体中のＴｉ化合物がこれを吸着するの
で、電界放出陰極のエミッタの尖端等が前記ガスに汚染
される等の不都合が避けられ、高電圧で駆動されるＦＥ
Ｄの寿命特性が改善されるという効果が得られる。According to the FED of the present invention, the Ti compound described in the claims is added to the phosphor of the anode. Therefore, FE
Even if a gas such as CO 2 or H 2 O is generated from the phosphor during driving of D, the Ti compound in the phosphor adsorbs the gas, so that the tip of the emitter of the field emission cathode is contaminated with the gas. FE driven by high voltage, avoiding inconvenience
The effect that the life characteristic of D is improved is obtained.
【図１】第１実施例におけるＴｉＯ2 添加量と輝度相対
値の関係を示す図である。FIG. 1 is a diagram showing a relationship between a TiO 2 addition amount and a luminance relative value in a first example.
【図２】第１実施例におけるＴｉＯ2 添加量とエミッシ
ョン半減時間（エミッション寿命）の関係を示す図であ
る。FIG. 2 is a diagram showing the relationship between the amount of TiO 2 added and the emission half-life (emission life) in the first example.
【図３】第１実施例における寿命試験前後のＦＥＤ外囲
器内の真空度相対値とＴｉＯ2添加量の関係を示す図で
ある。FIG. 3 is a diagram showing the relationship between the relative vacuum degree inside the FED envelope and the amount of TiO 2 added before and after the life test in the first embodiment.
【図４】第２実施例におけるＴｉＮ添加量とエミッショ
ン半減時間（エミッション寿命）の関係を示す図であ
る。FIG. 4 is a graph showing the relationship between the amount of TiN added and the emission half-life (emission life) in the second embodiment.
【図５】第２実施例におけるＴｉＮ添加量とエミッショ
ン半減時間（エミッション寿命）の関係を示す図であ
る。FIG. 5 is a diagram showing the relationship between the amount of TiN added and the emission half-life (emission life) in the second embodiment.
【図６】一般的なＦＥＤの構造を示す断面図である。FIG. 6 is a cross-sectional view showing the structure of a general FED.
【図７】第３実施例におけるＳｒＴｉＯ3 添加量とエミ
ッション半減時間（エミッション寿命）の関係を示す図
である。FIG. 7 is a graph showing the relationship between the amount of SrTiO 3 added and the emission half-life (emission life) in the third example.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０９Ｋ 11/79 ＣＰＲ Ｃ０９Ｋ 11/79 ＣＰＲ Ｈ０１Ｊ 29/20 Ｈ０１Ｊ 29/20 (56)参考文献 特開 平８−302342（ＪＰ，Ａ) 特開 平９−306336（ＪＰ，Ａ) 特開 平９−87618（ＪＰ，Ａ) 特開 平８−96734（ＪＰ，Ａ) 特開 平７−48570（ＪＰ，Ａ) 特開 平３−208242（ＪＰ，Ａ) 特開2000−223042（ＪＰ，Ａ) 特開2000−96045（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01J 31/12 H01J 29/20 C09K 11/00 - 11/08 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI C09K 11/79 CPR C09K 11/79 CPR H01J 29/20 H01J 29/20 (56) Reference JP-A-8-302342 (JP, A) JP-A-9-306336 (JP, A) JP-A-9-87618 (JP, A) JP-A-8-96734 (JP, A) JP-A-7-48570 (JP, A) JP-A-3 -208242 (JP, A) JP 2000-223042 (JP, A) JP 2000-96045 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H01J 31/12 H01J 29 / 20 C09K 11/00-11/08
Claims (3)
2 を蛍光体に対して０．２〜１．０ｗｔ％添加した電界
放出素子。1. TiO which is a powder having an average particle size of 1 μm or less.
A field emission device in which 2 to 0.2% by weight of phosphor is added .
体に対して０．２〜１．０ｗｔ％添加した電界放出素
子。2. Fluorescent TiN powder having an average particle size of 1 μm or less
A field emission device in which 0.2 to 1.0 wt% is added to the body .
を蛍光体に対して０．２〜１．０ｗｔ％添加した電界放
出素子。3. SrTiO 3 powder having an average particle size of 1 μm or less
A field emission device in which 0.2 to 1.0 wt% of phosphor is added .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05872599A JP3503517B2 (en) | 1999-03-05 | 1999-03-05 | Field emission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05872599A JP3503517B2 (en) | 1999-03-05 | 1999-03-05 | Field emission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000260360A JP2000260360A (en) | 2000-09-22 |
| JP3503517B2 true JP3503517B2 (en) | 2004-03-08 |
Family
ID=13092493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05872599A Expired - Fee Related JP3503517B2 (en) | 1999-03-05 | 1999-03-05 | Field emission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3503517B2 (en) |
-
1999
- 1999-03-05 JP JP05872599A patent/JP3503517B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000260360A (en) | 2000-09-22 |
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