JPH11263971A - Iron-activated lithium aluminate fluorescent substance and its fluorescent lamp - Google Patents
Iron-activated lithium aluminate fluorescent substance and its fluorescent lampInfo
- Publication number
- JPH11263971A JPH11263971A JP10069167A JP6916798A JPH11263971A JP H11263971 A JPH11263971 A JP H11263971A JP 10069167 A JP10069167 A JP 10069167A JP 6916798 A JP6916798 A JP 6916798A JP H11263971 A JPH11263971 A JP H11263971A
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- Japan
- Prior art keywords
- phosphor
- iron
- lithium aluminate
- sio
- fluorescent substance
- 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.)
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- Luminescent Compositions (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蛍光体粒子表面に表面
処理物質を被覆させた赤外発光蛍光体に係り、特に水性
バインダーの塗布により良好な蛍光膜を形成する鉄付活
アルミン酸リチウム蛍光体、及びその蛍光膜を有する低
圧水銀ランプに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared-emitting phosphor in which phosphor particles are coated with a surface-treating substance on the surface thereof, and more particularly to an iron-activated lithium aluminate which forms a good phosphor film by applying an aqueous binder. The present invention relates to a phosphor and a low-pressure mercury lamp having the phosphor film.
【０００２】[0002]
【従来の技術】一般に、赤外発光型の蛍光ランプは、例
えばＯＣＲ等の文字読み取り機器の光源、あるいは植物
の育成に有効な波長域の光を照射するための植物育成用
光源として用いられている。また、この種の赤外発光蛍
光ランプにおいては、２５４ｎｍの紫外線で励起したと
きに赤外波長域に発光し、その発光ピーク波長が７４０
ｎｍ付近にあり、一般式が次式で表される鉄付活アルミ
ン酸リチウム赤外発光蛍光体を、紫外線励起による発光
体として使用されている。 ＬｉＡｌＯ2：Ｆｅａ （ａは０．００１〜０．１グラム原子の３価のＦｅイオ
ン）2. Description of the Related Art In general, an infrared-emitting fluorescent lamp is used as a light source of a character reading device such as an OCR or a plant growing light source for irradiating light in a wavelength range effective for growing plants. I have. In addition, this type of infrared-emitting fluorescent lamp emits light in the infrared wavelength range when excited with ultraviolet light of 254 nm, and its emission peak wavelength is 740.
An iron-activated lithium aluminate infrared emitting phosphor having a wavelength of about nm and a general formula represented by the following formula is used as a luminescent material excited by ultraviolet light. LiAlO 2 : Fea (a is a trivalent Fe ion of 0.001 to 0.1 gram atom)
【０００３】しかし、鉄付活アルミン酸リチウム赤外発
光蛍光体は、吸湿性を有し、化学的に不安定であるた
め、実用上不都合な問題がある。例えば、長期保存過程
で発光効率の低下を招いたり、蛍光ランプの塗布に用い
られる蛍光体スラリー中で、ゲル化などの変性を起こし
て使用不能となることがある。However, the iron-activated lithium aluminate infrared emitting phosphor has a problem of practical use because it has hygroscopicity and is chemically unstable. For example, the luminous efficiency may be reduced during the long-term storage process, or the phosphor slurry used for coating the fluorescent lamp may become unusable due to denaturation such as gelation.
【０００４】これらの問題を解決するため、表面処理物
質として様々な無機物質を用いることが提案されてお
り、その具体例として、蛍光体に０．５〜１０．０重量
部のＡｌ2Ｏ3を添加、焼成して被覆させること（特開平
１−２１５８８５）、ＭｇＯ、ＣａＯ、ＳｒＯ、Ｂａ
Ｏ、Ｙ2Ｏ2からなる群れから選ばれた少なくとも１種の
金属酸化物微粒子で被覆させた蛍光体（特開平７−２６
８３１８）がある。これらは蛍光体粒子の吸水性の低
減、解消には効果があり、有機系の溶媒による塗布にお
いて蛍光ランプ特性が改善されている。[0004] In order to solve these problems, it has been proposed to use various inorganic substances as a surface treatment substance. As a specific example, 0.5 to 10.0 parts by weight of Al 2 O 3 is added to a phosphor. Is added and calcined to cover (JP-A-1-215885), MgO, CaO, SrO, Ba
Phosphor coated with at least one type of metal oxide fine particles selected from the group consisting of O and Y 2 O 2 (Japanese Patent Laid-Open No. 7-26
8318). These are effective in reducing and eliminating the water absorption of the phosphor particles, and the characteristics of the fluorescent lamp are improved by coating with an organic solvent.
【０００５】更に、本出願人は、以前に蛍光体表面を平
均粒径１μｍ以下で、β型、もしくはγ型の酸化アルミ
ニウムを、蛍光体に対し０．５重量部以上、２００重量
部以下の割合で混合、または付着することで、蛍光ラン
プの光束、劣化を著しく改善できることを開示した（特
開平５−９３１８７）。Further, the applicant of the present invention has previously reported that the phosphor surface may be coated with β-type or γ-type aluminum oxide having an average particle size of 1 μm or less and 0.5 to 200 parts by weight based on the phosphor. It has been disclosed that the luminous flux and the deterioration of the fluorescent lamp can be remarkably improved by mixing or adhering at a ratio (Japanese Patent Laid-Open No. 5-93187).
【０００６】ところで、蛍光ランプに用いる塗布液に
は、溶媒の種類により有機系と水性系があり、どちらの
溶媒を用いる場合にも一長一短がある。通常、鉄付活ア
ルミン酸リチウム蛍光体のように、吸湿性があり、水中
での安定度が低い場合には、前者の有機系が用いられ、
その代表的なものとしてニトロセルロースを酢酸ブチル
に溶解したＮＣバインダーがある。しかし、有機系の溶
媒を用いた場合に、塗布工程の原価が高くなり、臭気な
どのため作業環境が悪くなる等の理由があり、また環境
問題への配慮から、一般的に蛍光ランプの塗布液は水性
系に移行する傾向にあり、鉄付活アルミン酸リチウム蛍
光体についても同様な要請がある。[0006] Coating solutions used for fluorescent lamps are classified into organic and aqueous systems depending on the type of solvent, and both types have advantages and disadvantages. Usually, when the iron-activated lithium aluminate phosphor is hygroscopic and has low stability in water, the former organic system is used,
A typical example is an NC binder in which nitrocellulose is dissolved in butyl acetate. However, when an organic solvent is used, the cost of the coating process increases, the working environment deteriorates due to odor, and the like. The liquid tends to shift to an aqueous system, and there is a similar demand for an iron-activated lithium aluminate phosphor.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、鉄付活
アルミン酸リチウム蛍光体は、水中においてリチウムや
アルミニウムの溶出が著しい上に、短期間に粒子破壊や
ゲル化を引き起こす。このため、上記に例示した従来の
表面処理を施した蛍光体では、有機溶媒による塗布では
改善がみられるが、水性バインダーによる塗布を行うに
は、上述した蛍光体の性質のために、まだ不十分であっ
た。このことから、水性バインダー中の蛍光体は、有機
系の溶媒に比べて非常に厳しい環境下にあることがわか
る。However, the iron-activated lithium aluminate phosphor causes remarkable elution of lithium and aluminum in water, and causes particle destruction and gelation in a short period of time. For this reason, in the phosphors which have been subjected to the conventional surface treatment exemplified above, improvement can be seen by coating with an organic solvent, but coating with an aqueous binder is still not possible due to the above-mentioned properties of the phosphor. Was enough. This indicates that the phosphor in the aqueous binder is in a very severe environment as compared with the organic solvent.
【０００８】本発明は、上記問題点を解決するためにな
されたもので、水性バインダーに蛍光体を分散させた時
の経時的なリチウム、アルミニウムの溶出、粒子破壊、
ゲル化を抑制し、水性バインダー塗布による蛍光ランプ
の製造が可能となり、更に従来品以上の赤外出力維持率
を有する鉄付活アルミン酸リチウム蛍光体を提供するこ
とを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it has been found that lithium and aluminum are eluted over time and particles are destroyed when a phosphor is dispersed in an aqueous binder.
It is an object of the present invention to provide an iron-activated lithium aluminate phosphor that suppresses gelling, enables the production of a fluorescent lamp by applying an aqueous binder, and has an infrared output maintenance ratio higher than that of conventional products.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、蛍光体表
面にＳｉＯ2を被覆させることで上記課題を達成できる
ことを見いだし、本発明を完成するに至った。Means for Solving the Problems The present inventors have found that the above object can be achieved by coating the surface of the phosphor with SiO 2, and have completed the present invention.
【００１０】すなわち、本発明の鉄付活アルミン酸リチ
ウム蛍光体は、一般式が、 ＬｉＡｌＯ2：Ｆｅａ （ａは０．００１〜０．１グラム原子の３価のＦｅイオ
ン）で表され、前記蛍光体の粒子表面に、蛍光体１００
重量部に対してＳｉＯ2を０．１〜５重量部の範囲で被
覆させた蛍光体であり、水性バインダーに分散させて塗
布液として用いること、更に好ましくは、蛍光体の粒子
表面に、ＳｉＯ2を０．１〜５重量部、比表面積が５０
ｍ2／ｇ以上であるＡｌ2Ｏ3を１〜２０重量部の範囲で
被覆させることを特徴とする。That is, the iron-activated lithium aluminate phosphor of the present invention has a general formula represented by LiAlO 2 : Fea (a is a trivalent Fe ion of 0.001 to 0.1 gram atom), A phosphor 100 is provided on the surface of the phosphor particles.
A phosphor coated with 0.1 to 5 parts by weight of SiO 2 based on parts by weight, and used as a coating liquid by dispersing in an aqueous binder; 2 0.1 to 5 parts by weight, specific surface area 50
It is characterized in that Al 2 O 3 of m 2 / g or more is coated in a range of 1 to 20 parts by weight.
【００１１】[0011]
【発明の実施の形態】本発明において、ＳｉＯ2を被覆
する方法としては、従来の無機物質を被覆する方法を用
いることができ、例えば、単に乾式混合する方法、蛍光
体懸濁液にＳｉＯ2コロイドを添加混合する方法、Ｓｉ
のアルコキシド化合物を用いて被覆する方法等がある。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, as a method of coating SiO 2 , a conventional method of coating an inorganic substance can be used. For example, a method of simply dry-mixing, a method of coating a phosphor suspension with SiO 2. Method of adding and mixing colloid, Si
And the like.
【００１２】本発明を具体例を挙げて説明すると、エチ
ルシリケートのような有機珪素を、アルコールと純水と
を混合した溶液中に分散させた後、溶液を加温し、鉄付
活アルミン酸リチウム蛍光体を添加して撹拌する。その
後、アンモニア水溶液を滴下し、１時間ほど保温しなが
ら撹拌を続けることで、前記有機珪素が加水分解し、蛍
光体粒子表面にＳｉＯ2が析出し、被覆される。続け
て、デカンテーション、分離、乾燥して蛍光体粒子表面
にＳｉＯ2が被覆された鉄付活アルミン酸リチウム蛍光
体を得る。The present invention will be described with reference to specific examples. After dispersing organosilicon such as ethyl silicate in a solution obtained by mixing alcohol and pure water, the solution is heated and iron-activated aluminate is dispersed. Add lithium phosphor and stir. Thereafter, an aqueous ammonia solution is added dropwise, and stirring is continued while keeping the temperature for about 1 hour, whereby the organic silicon is hydrolyzed, and SiO 2 is precipitated and coated on the surface of the phosphor particles. Subsequently, decantation, separation and drying are performed to obtain an iron-activated lithium aluminate phosphor in which the surface of the phosphor particles is coated with SiO 2 .
【００１３】ここで、本発明の蛍光体におけるＳｉＯ2
の付着量は、蛍光体１００重量部に対して、０．１〜５
重量部の範囲、好ましくは０．５〜１．０重量部であ
る。なぜなら、０．１重量部より少ないと被覆が不十分
で、水性バインダーでの使用に耐えうる程度に耐水性が
改善されず、５重量部より多いと蛍光ランプの赤外初出
力が低下するだけでなく、光束維持率も大きく低下する
からである。また、前記ＳｉＯ2を被覆する方法におい
て好ましくは、Ｓｉのアルコキシド化合物を用いて被覆
する方法であり、Ｓｉのアルコキシド化合物として、好
ましくはエチルシリケートであり、溶媒としては、水や
有機溶媒を使用できるが、エタノールを用いることが好
ましい。なぜなら、Ｓｉのアルコキシド化合物による方
法は、他の方法に比べて、より緻密で均一なＳｉＯ2膜
が蛍光体粒子表面に形成されるからであり、より良好な
耐水性を有する蛍光体が得られる。Here, SiO 2 in the phosphor of the present invention is used.
Is 0.1 to 5 parts by weight with respect to 100 parts by weight of the phosphor.
It is in the range of parts by weight, preferably 0.5 to 1.0 part by weight. When the amount is less than 0.1 part by weight, the coating is insufficient, and the water resistance is not improved to the extent that it can be used in an aqueous binder. When the amount is more than 5 parts by weight, the infrared output of the fluorescent lamp only decreases. Not only that, but also the luminous flux maintenance rate is greatly reduced. Further, in the method of coating the SiO 2 , a method of coating with an alkoxide compound of Si is preferable, and the alkoxide compound of Si is preferably ethyl silicate, and water or an organic solvent can be used as a solvent. However, it is preferable to use ethanol. This is because, in the method using the alkoxide compound of Si, a denser and more uniform SiO 2 film is formed on the surface of the phosphor particles as compared with other methods, and a phosphor having better water resistance can be obtained. .
【００１４】Ａｌ2Ｏ3微粒子は、比表面積が５０ｍ2／
ｇ以上であるコロイダルアルミナが使用でき、更に好ま
しくは８０ｍ2／ｇ以上である。このような条件を満た
す市販品が使用できる。加えて、結晶構造はβ又はγ型
であることが好ましく、更に好ましくは反応性が高いγ
型を用いることである。なぜなら、α型であると経時的
な輝度低下を抑制する効果が得られないからである。ま
た、Ａｌ2Ｏ3を被覆する方法としては、上述したＳｉＯ
2と同様な被覆方法を用いることができ、好ましくは乾
式混合する方法である。ここで、比表面積は窒素ガス吸
着による定圧式ＢＥＴ−点法にて測定されたものであ
る。Al 2 O 3 fine particles have a specific surface area of 50 m 2 /
g or more of colloidal alumina, more preferably 80 m 2 / g or more. Commercial products satisfying such conditions can be used. In addition, the crystal structure is preferably β or γ type, more preferably highly reactive γ
Is to use a mold. This is because the effect of suppressing the temporal decrease in luminance cannot be obtained with the α-type. As a method of coating Al 2 O 3 , the above-mentioned SiO 2 is used.
The same coating method as in 2 can be used, and is preferably a dry mixing method. Here, the specific surface area is measured by a constant pressure BET-point method using nitrogen gas adsorption.
【００１５】本発明において、蛍光体の塗布に用いる水
性バインダーは、蛍光ランプの塗布に通常用いられるも
のであれば何でも良く、例えば、ポリエチレンオキサイ
ド、ヒドロキシプロピルセルロース、アンモニウムポリ
メタアクリレートを数％以下の割合で純水に溶解したも
のを挙げることができる。In the present invention, the aqueous binder used for coating the phosphor is not particularly limited as long as it is generally used for coating a fluorescent lamp. For example, polyethylene oxide, hydroxypropylcellulose and ammonium polymethacrylate are used in an amount of several percent or less. Examples thereof include those dissolved in pure water in a ratio.
【００１６】[0016]
【作用】鉄付活アルミン酸リチウム蛍光体粒子の表面
に、ＳｉＯ2を被覆することで、吸湿性の改善、特に水
中でのリチウム、アルミニウムの溶出や粒子破壊による
輝度低下、塗布スラリーのゲル化の問題がほぼ解消され
る。このことから、水性バインダーを用いた塗布スラリ
ー中でも、蛍光体は同様に振る舞い、長時間の保存によ
っても蛍光体及び得られる蛍光膜の劣化が起こらないと
考えられる。[Function] By coating the surface of iron-activated lithium aluminate phosphor particles with SiO 2 , the hygroscopicity is improved, especially the brightness is reduced due to the dissolution of lithium and aluminum in water and the destruction of the particles, and the gelation of the coating slurry. The problem is almost eliminated. From this, it is considered that the phosphor behaves similarly in the application slurry using the aqueous binder, and that the phosphor and the obtained phosphor film do not deteriorate even after long-term storage.
【００１７】さらに、ＳｉＯ2に加えてＡｌ2Ｏ3も被覆
することで、蛍光ランプ使用時の水銀、水銀化合物によ
る経時的な輝度低下及び黒化の発生を抑制することがで
きる。好ましくは、蛍光体表面にＳｉＯ2を被覆した
後、Ａｌ2Ｏ3を付着させること、つまり蛍光体表面にＳ
ｉＯ2の層を、更にその外側にＡｌ2Ｏ3の層を配置する
ことで、前述したＳｉＯ2、Ａｌ2Ｏ3による効果を最大
限に引き出すことができる。Further, by coating Al 2 O 3 in addition to SiO 2 , it is possible to suppress a temporal decrease in luminance and blackening caused by mercury and a mercury compound when a fluorescent lamp is used. Preferably, after coating the phosphor surface with SiO 2 , Al 2 O 3 is attached, that is, S
By arranging the layer of iO 2 and the layer of Al 2 O 3 on the outside thereof, the above-described effects of SiO 2 and Al 2 O 3 can be maximized.
【００１８】[0018]
【実施例】［実施例１］蛍光体原料として、炭酸リチウ
ム（Ｌｉ2ＣＯ3）１２１．９ｇ、アルミナ（Ａｌ2Ｏ3）
１６９ｇ、硝酸第二鉄９水和物｛Ｆｅ（ＮＯ3）3・９Ｈ2
Ｏ｝８．１ｇを秤量し、これらをアルミナボールを入れ
た３００ｍｌの磁性ポット中で、メタノール約５０ｍｌ
と共に、５時間ローリングして粉砕混合した。乾燥後、
この粉砕混合物をアルミナ坩堝に充填し蓋をした後、空
気雰囲気中、１２００℃で３時間焼成した。焼成終了
後、得られた蛍光体を粉砕し、３００メッシュの篩を通
すことにより、平均粒径５μｍの鉄付活アルミン酸リチ
ウム蛍光体を得た。[Example 1] As a phosphor material, 121.9 g of lithium carbonate (Li 2 CO 3 ) and alumina (Al 2 O 3 ) were used.
169 g, ferric nitrate nonahydrate {Fe (NO 3 ) 3 .9H 2
O｝ 8.1 g was weighed and placed in a 300 ml magnetic pot containing alumina balls in about 50 ml of methanol.
In addition, the mixture was rolled and crushed and mixed for 5 hours. After drying,
The pulverized mixture was filled in an alumina crucible, covered, and baked at 1200 ° C. for 3 hours in an air atmosphere. After the firing, the obtained phosphor was pulverized and passed through a 300-mesh sieve to obtain an iron-activated lithium aluminate phosphor having an average particle size of 5 μm.
【００１９】次に、ビーカーに純水を２０ｇ、エタノー
ルを２００ｇ、エチルシリケート（４０％）を０．１２
５ｇ加える。さらに、前記蛍光体を５０ｇ加え、撹拌し
ながら７０℃になるまで加温し、保持した。続いて、１
０％アンモニア水を４ｇ加え、更に１時間撹拌する。得
られた溶液をデカンテーションにより水洗し、分離、乾
燥することで蛍光体１００重量部に対してＳｉＯ2が
０．１重量部被覆した鉄付活アルミン酸リチウム蛍光体
を得た。Next, 20 g of pure water, 200 g of ethanol, and 0.12 of ethyl silicate (40%) were placed in a beaker.
Add 5 g. Further, 50 g of the phosphor was added, and the mixture was heated to 70 ° C. while stirring and maintained. Then 1
4 g of 0% aqueous ammonia is added, and the mixture is further stirred for 1 hour. The obtained solution was washed with water by decantation, separated and dried to obtain an iron-activated lithium aluminate phosphor coated with 0.1 part by weight of SiO 2 per 100 parts by weight of the phosphor.
【００２０】［実施例２〜４］蛍光体表面に被覆された
前記ＳｉＯ2の量が表１に示す量であること以外、実施
例１と同様にして鉄付活アルミン酸リチウム蛍光体を得
た。[Examples 2 to 4] An iron-activated lithium aluminate phosphor was obtained in the same manner as in Example 1 except that the amount of the SiO 2 coated on the phosphor surface was as shown in Table 1. Was.
【００２１】［比較例１］ＳｉＯ2を被覆させないこと
以外、実施例１と同様にして鉄付活アルミン酸リチウム
蛍光体を得た。Comparative Example 1 An iron-activated lithium aluminate phosphor was obtained in the same manner as in Example 1 except that SiO 2 was not coated.
【００２２】［耐水性の評価］このようにして得られた
実施例１〜４、比較例１の蛍光体２０ｇと純水１００ｇ
を２５０ｍｌのポリビーカー中に入れ、約６０ｒｐｍに
てローリングしながら放置した。１週間後そのスラリー
を分離し、粉体輝度を測定した。また、純水にポリエチ
レンオキサイドを０．６％添加した水性バインダーと、
結着剤（酸化アルミニウム）とをビーカーに添加混合
し、蛍光体を懸濁させた後、通常のＦＬ４０ＳＳ蛍光ラ
ンプを作製する方法で、塗布、乾燥、ベーキング、ラン
プメーキングの工程を経て、蛍光ランプを製造した。得
られた蛍光ランプの作製直後（０時間）と１００時間経
過後の明るさを測定し、その結果を表１に示す。ここ
で、明るさとは、０時間では比較例１の明るさを１００
とした相対値であり、１００時間／０時間では各実施例
及び比較例の０時間における明るさを１００として１０
０時間経過後の明るさを示した相対値である。[Evaluation of Water Resistance] 20 g of the phosphors obtained in Examples 1 to 4 and Comparative Example 1 thus obtained and 100 g of pure water were obtained.
Was placed in a 250 ml polybeaker, and allowed to stand while rolling at about 60 rpm. One week later, the slurry was separated, and the powder luminance was measured. An aqueous binder obtained by adding 0.6% of polyethylene oxide to pure water,
A binder (aluminum oxide) is added to a beaker, mixed, and the phosphor is suspended. The method of manufacturing a normal FL40SS fluorescent lamp is followed by applying, drying, baking, and lamp-making steps to form a fluorescent lamp. Was manufactured. Brightness was measured immediately after the production of the obtained fluorescent lamp (0 hour) and after 100 hours, and the results are shown in Table 1. Here, the brightness means that the brightness of Comparative Example 1 is 100 at 0 hours.
In 100 hours / 0 hours, the brightness at 0 hours of each example and the comparative example is set to 100 and 10
This is a relative value indicating the brightness after a lapse of 0 hours.
【００２３】[0023]
【表１】 [Table 1]
【００２４】表１から明らかなように、ＳｉＯ2を被覆
することにより、水中での保存における蛍光体の輝度低
下を大幅に改善することができ、また蛍光ランプの作製
時及び赤外出力維持率は、ＳｉＯ2を被覆していない蛍
光体を用いた場合と同程度であった。As is clear from Table 1, the coating of SiO 2 can greatly reduce the decrease in the luminance of the phosphor during storage in water, and can also be used to produce a fluorescent lamp and to maintain the infrared output. Was comparable to the case where a phosphor not coated with SiO 2 was used.
【００２５】［実施例５］実施例２で得られたＳｉＯ2
が被覆された鉄付活アルミン酸リチウム蛍光体２０ｇと
比表面積が１２０ｍ2／ｇで、γ型の酸化アルミニウム
（デグサ社製Alminiumoxide-c）０．２ｇを乾式混合す
る。この混合物と、純水にポリエチレンオキサイドを添
加した水性バインダーと、結着剤（酸化アルミニウム）
とをビーカー中で懸濁させて、塗布液を調製した。上述
の水性バインダーを用いた塗布と同様にして、ＦＬ４０
ＳＳ蛍光ランプを製造した。Example 5 The SiO 2 obtained in Example 2
Is dry-mixed with 20 g of an iron-activated lithium aluminate phosphor coated with, and 0.2 g of γ-type aluminum oxide (Alminium oxide-c manufactured by Degussa) having a specific surface area of 120 m 2 / g. This mixture, an aqueous binder obtained by adding polyethylene oxide to pure water, and a binder (aluminum oxide)
Were suspended in a beaker to prepare a coating solution. In the same manner as in the above-mentioned application using the aqueous binder, FL40
An SS fluorescent lamp was manufactured.
【００２６】［実施例６〜８］前記γ型の酸化アルミニ
ウムの量が、表２に示す量であること以外、実施例５と
同様にして塗布液を調製し、蛍光ランプを製造した。Examples 6 to 8 A coating solution was prepared in the same manner as in Example 5 except that the amount of the γ-type aluminum oxide was as shown in Table 2, and a fluorescent lamp was manufactured.
【００２７】［比較例２］実施例１のＳｉＯ2を被覆す
る前の鉄付活アルミン酸リチウム蛍光体と、有機バイン
ダー（ニトロセルロースを酢酸ブチルに溶解したＮＣバ
インダー）と、結着剤（酸化アルミニウム）とをビーカ
ー中で懸濁させて、塗布液を調製した。この塗布液をＦ
Ｌ４０ＳＳに塗布、乾燥、ベーキング、ランプメーキン
グ工程を経て蛍光ランプを製造した。Comparative Example 2 The iron-activated lithium aluminate phosphor of Example 1 before coating with SiO 2 , an organic binder (an NC binder in which nitrocellulose was dissolved in butyl acetate), and a binder (oxidizing) Aluminum) was suspended in a beaker to prepare a coating solution. Apply this coating solution to F
A fluorescent lamp was manufactured through the steps of coating, drying, baking and lamp making on L40SS.
【００２８】［赤外出力維持率の評価］このようにして
得られた実施例５〜８、比較例２の蛍光ランプの明るさ
を表２に示す。[Evaluation of Infrared Output Maintenance Ratio] Table 2 shows the brightness of the fluorescent lamps of Examples 5 to 8 and Comparative Example 2 thus obtained.
【００２９】[0029]
【表２】 [Table 2]
【００３０】表２から明らかなように、蛍光体表面にＳ
ｉＯ2と酸化アルミニウムを被覆することで、水性バイ
ンダーの塗布であっても、従来の有機バインダーの塗布
により製造された蛍光ランプに比べて、赤外出力維持率
が向上していることがわかる。As is evident from Table 2, the phosphor surface has S
It can be seen that, by coating iO 2 and aluminum oxide, even in the case of application of the aqueous binder, the infrared output maintenance ratio is improved as compared with the fluorescent lamp manufactured by applying the conventional organic binder.
【００３１】[0031]
【発明の効果】本発明のＳｉＯ2を表面に被覆した鉄付
活アルミン酸リチウム蛍光体は、水中での安定性に優
れ、水性バインダー中でも良好な安定性を示し、また水
性バインダーによる塗布が可能となった。更に、ＳｉＯ
2と酸化アルミニウムとを被覆させることにより、前記
水中での安定性に加えて、蛍光ランプの使用時における
経時的な輝度低下が抑制され、赤外出力維持率について
も、従来品以上の蛍光ランプを製造することができた。The iron-activated lithium aluminate phosphor having a surface coated with SiO 2 according to the present invention has excellent stability in water, shows good stability even in an aqueous binder, and can be applied with an aqueous binder. It became. Furthermore, SiO
By coating with 2 and aluminum oxide, in addition to the stability in water, a decrease in luminance over time during use of the fluorescent lamp is suppressed, and the infrared output maintenance ratio is also higher than that of the conventional fluorescent lamp. Could be manufactured.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 斎 祐司 徳島県阿南市上中町岡491番地100 日亜化 学工業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Sakai 491 Kaminakacho Oka, Anan-shi, Tokushima Pref. Nichia Chemical Industry Co., Ltd.
Claims (4)
ン）で表される鉄付活アルミン酸リチウム蛍光体におい
て、前記蛍光体の粒子表面に、表面処理物質として蛍光
体１００重量部に対し０．１〜５重量部の範囲のＳｉＯ
2を被覆させた蛍光体であり、水性バインダーに分散さ
せて塗布液として用いることを特徴とする鉄付活アルミ
ン酸リチウム蛍光体。1. An iron-activated lithium aluminate phosphor represented by the general formula: LiAlO 2 : Fea (a is a trivalent Fe ion having 0.001 to 0.1 gram atom), wherein On the particle surface, 0.1 to 5 parts by weight of SiO is used as a surface treatment substance with respect to 100 parts by weight of the phosphor
2. An iron-activated lithium aluminate phosphor, which is a phosphor coated with 2 , and used as a coating solution by being dispersed in an aqueous binder.
表面積が５０ｍ2／ｇ以上のＡｌ2Ｏ3とからなり、前記
Ａｌ2Ｏ3が蛍光体１００重量部に対して１〜２０重量部
の範囲であることを特徴とする請求項１記載の鉄付活ア
ルミン酸リチウム蛍光体。2. The surface treatment substance comprises the SiO 2 and Al 2 O 3 having a specific surface area of 50 m 2 / g or more, wherein the Al 2 O 3 is 1 to 20 parts by weight based on 100 parts by weight of the phosphor. 2. The iron-activated lithium aluminate phosphor according to claim 1, wherein the amount is in the range of parts by weight.
のアルコキシド化合物を加水分解することにより、蛍光
体粒子表面にＳｉＯ2を被覆させた請求項１又は２記載
の鉄付活アルミン酸リチウム蛍光体。3. The phosphor coated with SiO 2 comprises Si
3. The iron-activated lithium aluminate phosphor according to claim 1, wherein the phosphor particles are coated with SiO 2 by hydrolyzing the alkoxide compound of (1).
チウム蛍光体を蛍光膜として有することを特徴とする低
圧水銀ランプ。4. A low-pressure mercury lamp comprising the iron-activated lithium aluminate phosphor according to claim 1 as a phosphor film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06916798A JP3755285B2 (en) | 1998-03-19 | 1998-03-19 | Iron-activated lithium aluminate phosphor and its fluorescent lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06916798A JP3755285B2 (en) | 1998-03-19 | 1998-03-19 | Iron-activated lithium aluminate phosphor and its fluorescent lamp |
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| Publication Number | Publication Date |
|---|---|
| JPH11263971A true JPH11263971A (en) | 1999-09-28 |
| JP3755285B2 JP3755285B2 (en) | 2006-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014145040A (en) * | 2013-01-29 | 2014-08-14 | Sakai Chem Ind Co Ltd | Production method of composition for stress light-emitting material, composition for stress light-emitting material obtained by the production method, and stress light-emitting material produced from the composition |
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| Publication number | Publication date |
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| JP3755285B2 (en) | 2006-03-15 |
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