JPS62177087A - Fluorescent composition - Google Patents
Fluorescent compositionInfo
- Publication number
- JPS62177087A JPS62177087A JP1667586A JP1667586A JPS62177087A JP S62177087 A JPS62177087 A JP S62177087A JP 1667586 A JP1667586 A JP 1667586A JP 1667586 A JP1667586 A JP 1667586A JP S62177087 A JPS62177087 A JP S62177087A
- Authority
- JP
- Japan
- Prior art keywords
- moisture
- fluorescent
- phosphor
- coating
- light
- 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
- 239000000203 mixture Substances 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 33
- 230000004888 barrier function Effects 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 229910010272 inorganic material Inorganic materials 0.000 abstract description 3
- 239000011147 inorganic material Substances 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000004408 titanium dioxide Substances 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract 2
- 238000002834 transmittance Methods 0.000 abstract 2
- 150000002902 organometallic compounds Chemical class 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 150000003377 silicon compounds Chemical class 0.000 abstract 1
- 239000012808 vapor phase Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 15
- 239000011230 binding agent Substances 0.000 description 7
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 5
- 239000005049 silicon tetrachloride Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229920002050 silicone resin Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010574 gas phase reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Luminescent Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、蛍光発光装置に用いられる蛍光組成物に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fluorescent composition used in a fluorescent device.
【従来の技術］
蛍光体は、光線、電場、熱等の励起エネルギによって発
光するもので、消費エネルギが少ない等の優れた特性を
有する関係上、この蛍光体の粉末を樹脂等のバインダに
分散させたり、塗料に含浸させたりして、各種のディス
プレイ装置等に広く応用されている。[Prior art] Phosphors emit light when excited by excitation energy such as light, electric fields, heat, etc. Because they have excellent properties such as low energy consumption, powder of this phosphor is dispersed in a binder such as resin. It is widely used in various display devices, such as by soaking it in paint or by impregnating it with paint.
ここで、蛍光体は水分を含んだ雰囲気下で長期間使用す
ると、それが酸化される等してその輝度が低下してしま
うことになる。このために、従来技術においては、かか
る蛍光体を使用する場合にはそれを密閉した装置内に装
着したり、また開放された装置に装着する場合には、防
湿性の優れた部材からなる封止フィルム等を使用し、該
封止フィルムで蛍光体を真空パックすることによってそ
れを防湿保護するように構成していた。Here, if the phosphor is used for a long period of time in an atmosphere containing moisture, it will be oxidized and its brightness will decrease. For this reason, in the prior art, when such a phosphor is used, it must be installed in a closed device, or when it is installed in an open device, it must be sealed with a material that is highly moisture-proof. A sealing film or the like is used, and the phosphor is vacuum-packed with the sealing film to protect it from moisture.
■発明が解決しようとする問題点Ｊ
ところで、前述したように蛍光体を防湿保護するために
、密閉装置や封止フィルムを使用することは、該蛍光体
の用途が限定されるだけでなく、装置の密閉及び封止の
完全性を図らなければならず、その防湿作業が著しく面
倒であるだけでなく、僅かでも密閉、封止に不完全さが
あると、蛍光体の輝度低下を免れない等の不都合があっ
た。■Problems to be solved by the invention J By the way, as mentioned above, using a sealing device or a sealing film to protect the phosphor from moisture not only limits the uses of the phosphor, but also It is necessary to ensure the integrity of the sealing and sealing of the device, and not only is the moisture-proofing work extremely troublesome, but even the slightest imperfection in sealing or sealing will inevitably reduce the brightness of the phosphor. There were other inconveniences.
また、封止フィルムで密閉する場合には、この封止フィ
ルムとして特殊なラミネートフィルムを使用しなければ
ならず、全体として蛍光発光装置が高価になるだけでな
く、封止フィルムにはシール部分等を必要とする関係上
、その蛍光発光装置の全体形状が大きくなり、その設置
スペースが余分に必要となるという欠点もあった。In addition, when sealing with a sealing film, a special laminate film must be used as the sealing film, which not only makes the fluorescent device more expensive as a whole, but also the sealing film has a sealing part etc. Because of the need for a fluorescent light emitting device, the overall shape of the fluorescent light emitting device becomes large, and there is also the drawback that extra installation space is required.
本発明は叙上の点に鑑みてなされたもので、湿気を含ん
だ雰囲気下で使用しても輝度変化の少ない蛍光体組成物
を提供することを目的とするものである。The present invention has been made in view of the above points, and it is an object of the present invention to provide a phosphor composition that exhibits little change in brightness even when used in a humid atmosphere.
［問題点を解決するための手段１
前述の目的を達成するために、本発明に係る蛍光体組成
物は、蛍光体粉末の表面に透光性を有し、水分に対する
バリヤ性を有する部材からなる防湿コーティングを施す
構成としたことをその特徴とするものである。[Means for Solving the Problems 1] In order to achieve the above-mentioned object, the phosphor composition according to the present invention includes a material having translucency on the surface of phosphor powder and a barrier property against moisture. Its feature is that it is constructed with a moisture-proof coating.
［作用１
前述した如く、蛍光体粉末それ自体に防湿コーティング
を施して蛍光体組成物となすことによって、この蛍光体
組成物をバインダに分散させたり、塗料中に含浸させる
等によって蛍光発光装置に装着した場合において、この
蛍光発光装置全体を密閉する等により防湿保護を施すこ
となく、開放された状態で使用しても、蛍光体粉末は水
分に対するバリヤ特性の優れた防湿コーティングによっ
て被覆されているので、蛍光体が直接水分に接触するお
それがない。従って、長期間使用しても蛍光体に変質・
劣化を生じるおそれがなく、常に安定した輝度を維持さ
せることができ、蛍光発光装置の長寿命化を図ることが
できるようになる。[Effect 1] As mentioned above, by applying a moisture-proof coating to the phosphor powder itself to form a phosphor composition, this phosphor composition can be dispersed in a binder or impregnated into a paint to form a fluorescent light emitting device. When installed, the phosphor powder is covered with a moisture-proof coating that has excellent barrier properties against moisture, even if it is used in an open state without applying moisture-proof protection such as sealing the entire fluorescent light-emitting device. Therefore, there is no risk that the phosphor will come into direct contact with moisture. Therefore, even if used for a long time, the phosphor will deteriorate and
There is no risk of deterioration, stable brightness can be maintained at all times, and the life of the fluorescent light emitting device can be extended.
ここで、防湿コーテイング材としては、水分に対するバ
リヤ特性に優れ、かつ透光性を有する部材から選択され
るが、例えば二酸化けい素、二酸化チタン等の無機物や
有機金属等の有機物が好適に用いられる。Here, the moisture-proof coating material is selected from materials that have excellent moisture barrier properties and translucency, and for example, inorganic materials such as silicon dioxide and titanium dioxide, and organic materials such as organic metals are preferably used. .
［実施例１
以下、本発明の実施例を図面に基づいて詳細に説明する
。[Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
まず、第１図は蛍光体組成物の断面を示し、図中１は蛍
光体粉末で、該蛍光体粉末ｌの表面には透光性が良好で
、水分に対するバリヤ特性に優れた部材からなる防湿コ
ーティング２によってその全体を被覆することにより蛍
光体組成物３が構成されている。First, FIG. 1 shows a cross section of a phosphor composition, in which 1 is a phosphor powder, and the surface of the phosphor powder L is made of a material that has good translucency and excellent barrier properties against moisture. A phosphor composition 3 is constructed by covering the entire body with a moisture-proof coating 2.
次に、第２図に基づいて、蛍光体粉末１に対する防湿コ
ーティング２の被覆方法の一例を説明する。Next, an example of a method of coating the phosphor powder 1 with the moisture-proof coating 2 will be explained based on FIG.
同図においては、無機材からなるコーティングを施す装
置が概略的に示されており、図中ｌＯは四塩化けい素溶
液の貯溜槽で、該貯溜槽ｌＯ内にはその四塩化けい素溶
液内に浸漬させた状態にドライエアの送気￥！−１１が
設置されている。そして、送気管１１から供給されるド
ライエアを四塩化けい素溶液内に送ることによって、ド
ライエアの気泡中に四塩化けい素を含ませる。この四塩
化けい素を含んだエアを配管１２を介して蛍光体粉末１
を収容した加熱槽１３内に送り込み、該加熱槽１３を３
００〜４００°Ｃにまで加熱しつつ、その内部に設置し
た蛍光体粉末１を撹拌することによって、気相反応によ
り該蛍光体粉末１の表面を二酸化けい素による防湿コー
ティング２で被覆させることができるようになる。In the figure, an apparatus for applying a coating made of an inorganic material is schematically shown. Supply dry air to the immersed state! -11 is installed. Then, by sending the dry air supplied from the air pipe 11 into the silicon tetrachloride solution, silicon tetrachloride is included in the bubbles of the dry air. The air containing silicon tetrachloride is passed through the pipe 12 to the phosphor powder 1.
into the heating tank 13 containing the
By stirring the phosphor powder 1 placed inside the phosphor powder 1 while heating it to 00 to 400°C, the surface of the phosphor powder 1 can be coated with a moisture-proof coating 2 made of silicon dioxide through a gas phase reaction. become able to.
前述のように蛍光体粉末１に防湿コーティング２を施す
ことによって形成した蛍光組成物３は、例えば第３図に
示したように、合成樹脂等のバインダ２０中に分散させ
た状態にして蛍光素子２１となし、この蛍光素子２１を
適宜の蛍光発光装置に装着し、それに光線、電場、熱等
の励起エネルギを照射することによって、該蛍光素子２
１を蛍光させることができるようになる。The fluorescent composition 3 formed by applying the moisture-proof coating 2 to the phosphor powder 1 as described above is dispersed in a binder 20 such as a synthetic resin, for example, as shown in FIG. 21, this fluorescent element 21 is attached to a suitable fluorescent light emitting device, and by irradiating it with excitation energy such as a light beam, an electric field, heat, etc., the fluorescent element 2
1 becomes fluorescent.
面して、前述の蛍光素子２１を湿気の含んだ雰囲気中で
使用しても、この蛍光素子２１における蛍光体粉末ｌは
水分に対するバリヤ特性の優れた防湿コーティング２に
よって保護されているので、該蛍光体粉末ｌが直接水分
と接触して酸化する等の不都合を生じることがなく、長
期間使用してもその輝度が低下することはない。On the other hand, even if the aforementioned fluorescent element 21 is used in a humid atmosphere, the phosphor powder l in this fluorescent element 21 is protected by the moisture-proof coating 2 which has excellent barrier properties against moisture. The phosphor powder 1 does not come into direct contact with moisture and cause any inconvenience such as oxidation, and its brightness does not decrease even after long-term use.
なお、防湿コーティングは、第４図に示したように、有
機けい素等の有機金属の溶液槽３０内に蛍光体粉末１を
混合し、これを撹拌装置３１により撹拌することによっ
ても形成することができる。Incidentally, the moisture-proof coating can also be formed by mixing the phosphor powder 1 in a solution tank 30 of an organic metal such as organosilicon and stirring this with a stirring device 31, as shown in FIG. I can do it.
実験例
前述した第２図に示した装置を使用し、蛍光体粉末とし
て、シルバニア＃７２３を使用し、この蛍光体粉末を加
熱層１３に入れた状態で、２０℃のドライエアを送気管
１１から四塩化けい素の貯溜槽１０に０．１ Ｅ／Ｉａ
ｉｎ、送り込み、配管１２から３５０℃に加熱した加熱
槽１３に四塩化けい素を含むエアを３０分間送り込んで
二酸化けい素の防湿コーティングを行った蛍光組成物を
得た。この蛍光組成物２０重量部とバインダとしてのシ
リコン樹脂（東しシリコーン製ＣＹ５２−００５） １
０重量部とを混練して発光素子試料Ｉを形成した。Experimental Example Using the apparatus shown in FIG. 0.1 E/Ia in silicon tetrachloride storage tank 10
Air containing silicon tetrachloride was fed into the heating tank 13 heated to 350° C. from the pipe 12 for 30 minutes to obtain a fluorescent composition coated with a moisture-proof coating of silicon dioxide. 20 parts by weight of this fluorescent composition and a silicone resin as a binder (CY52-005 manufactured by Toshi Silicone) 1
0 parts by weight were kneaded to form light emitting device sample I.
次に、第４図に示した装置を使用し、前述と同様の蛍光
体粉末１０重量部と有機けい素（日本曹達製アトロン）
２重量部をよく撹拌し、溶剤が蒸発するまで放置する。Next, using the apparatus shown in FIG.
Stir 2 parts by weight thoroughly and leave until the solvent evaporates.
然る後、５００℃、１０分間の熱処理をし、小型のＶ型
ブレンダで元の粉末状に戻して蛍光組成物を得た。この
蛍光組成物２０重量部とバインダとしての前述と同様の
シリコン樹脂１０重量部とを混練することによって、発
光素子試料ＩＩを形成した。Thereafter, it was heat-treated at 500° C. for 10 minutes and returned to its original powder form using a small V-type blender to obtain a fluorescent composition. Light emitting device sample II was formed by kneading 20 parts by weight of this fluorescent composition and 10 parts by weight of the same silicone resin as described above as a binder.
さらに、第４図に示した装置を使用し、蛍光体粉末１０
重量部とメチル・トリメトキシ・シラン２゜５垂部部と
を混練し、これを２５０℃で１０分間熱処理することに
よって、発光素子試料ＩＩＩを形成した。Furthermore, using the apparatus shown in FIG.
Part by weight and 2.5 parts by weight of methyl trimethoxy silane were kneaded and heat treated at 250° C. for 10 minutes to form light emitting device sample III.
前述のようにして形成した発光素子試料Ｉ 、ＩＩ及び
ＩＩＩをそれぞれ１ｇ採取し、これらを第５図に示した
ようにガラス板からなる透明電極４０．４０に挟み込み
、この透明電極４０．４０間にスペーサ４１（５０ｇｍ
厚）を介装し、該各電極間に交流電源４２を接続し、２
５±１°Ｃ９湿度５０±１０％の雰囲気中において、４
００ｃｙｃｌｅ／ｓｅｃ 、１５０Ｖ（７）負荷をかけ
て輝度の変化を測定した。1 g of each of the light emitting device samples I, II, and III formed as described above was taken, and these were sandwiched between transparent electrodes 40.40 made of glass plates as shown in FIG. spacer 41 (50gm
an AC power source 42 is connected between each electrode, and
In an atmosphere of 5±1°C9 humidity 50±10%, 4
Changes in brightness were measured by applying a load of 150 V (7) at 00 cycles/sec.
これらと、蛍光体粉末２０重量部を防湿コーティングす
ることなく、バインダどしてのシリコン樹脂１０重量部
とを混練した従来技術の発光素子試料ＩＶを同様にして
輝度変化の測定を行った。In the same manner, the brightness change was measured for light-emitting element sample IV of the prior art in which these and 20 parts by weight of phosphor powder were kneaded with 10 parts by weight of silicone resin as a binder without applying a moisture-proof coating.
結果を表に示す。The results are shown in the table.
［発明の効果１
以上詳述した如く、本発明に係る蛍光組成物は、蛍光体
粉末の表面自体に防湿コーティングを施す構成としたか
ら、格別の封止を行うことなく、水分を含んだ雰囲気中
において開放状態で長期間使用しても、その輝度が低下
することがなくなり、この蛍光組成物を使用することに
よって高信頼性で、しかも長寿命の発光素子を形成する
ことができるようになる。[Effect of the Invention 1] As detailed above, the fluorescent composition according to the present invention has a structure in which a moisture-proof coating is applied to the surface of the phosphor powder itself, so that it can be used in a moisture-containing atmosphere without special sealing. Even if the device is left open for a long period of time, its brightness will not decrease, and by using this fluorescent composition, it will be possible to form a highly reliable and long-life light emitting device. .
第１図は本発明の一実施例を示す蛍光組成物の断面図、
第２図は蛍光組成物を製造するための−の装置を示す概
略構成図、第３図は発光素子の断面図、第４図は蛍光組
成物を製造するための他の装置の概略構成図、第５図は
発光素子の輝度変化を測定するための試験装置の概略構
成図である。
１：蛍光体粉末、２：防湿コーティング、３：蛍光組成
物、２０：バインダ、２１：発光素子。
第１図
第２図
第３図
第４図
第５図
□
４とFIG. 1 is a cross-sectional view of a fluorescent composition showing an embodiment of the present invention;
Fig. 2 is a schematic diagram showing a device for producing a fluorescent composition, Fig. 3 is a cross-sectional view of a light emitting element, and Fig. 4 is a schematic diagram of another device for producing a fluorescent composition. , FIG. 5 is a schematic configuration diagram of a test device for measuring changes in brightness of a light emitting element. 1: Phosphor powder, 2: Moisture-proof coating, 3: Fluorescent composition, 20: Binder, 21: Light emitting element. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 □ 4 and
Claims (1)
ヤ性を有する部材からなる防湿コーテイングを施してな
る蛍光組成物。A fluorescent composition comprising a moisture-proof coating made of a material that is translucent and has barrier properties against moisture on the surface of phosphor powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1667586A JPS62177087A (en) | 1986-01-30 | 1986-01-30 | Fluorescent composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1667586A JPS62177087A (en) | 1986-01-30 | 1986-01-30 | Fluorescent composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62177087A true JPS62177087A (en) | 1987-08-03 |
Family
ID=11922884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1667586A Pending JPS62177087A (en) | 1986-01-30 | 1986-01-30 | Fluorescent composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62177087A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5156885A (en) * | 1990-04-25 | 1992-10-20 | Minnesota Mining And Manufacturing Company | Method for encapsulating electroluminescent phosphor particles |
| US5593782A (en) * | 1992-07-13 | 1997-01-14 | Minnesota Mining And Manufacturing Company | Encapsulated electroluminescent phosphor and method for making same |
| JPH11263971A (en) * | 1998-03-19 | 1999-09-28 | Nichia Chem Ind Ltd | Iron-activated lithium aluminate fluorescent substance and its fluorescent lamp |
| US5958591A (en) * | 1997-06-30 | 1999-09-28 | Minnesota Mining And Manufacturing Company | Electroluminescent phosphor particles encapsulated with an aluminum oxide based multiple oxide coating |
| KR100366887B1 (en) * | 1997-10-27 | 2003-03-26 | 오스람 실바니아 인코포레이티드 | Phosphor coating method for electroluminescence and phosphors manufactured accordingly |
| US20130279133A1 (en) * | 2012-04-23 | 2013-10-24 | Fujitsu Limited | Electronic device |
-
1986
- 1986-01-30 JP JP1667586A patent/JPS62177087A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5156885A (en) * | 1990-04-25 | 1992-10-20 | Minnesota Mining And Manufacturing Company | Method for encapsulating electroluminescent phosphor particles |
| US5418062A (en) * | 1990-04-25 | 1995-05-23 | Minnesota Mining And Manufacturing Company | Encapsulated electroluminescent phosphor particles |
| US5439705A (en) * | 1990-04-25 | 1995-08-08 | Minnesota Mining And Manufacturing Company | Encapsulated electroluminescent phosphor and method for making same |
| US5908698A (en) * | 1990-04-25 | 1999-06-01 | Minnesota Mining And Manufacturing Company | Encapsulated electroluminescent phosphor and method for making same |
| US5593782A (en) * | 1992-07-13 | 1997-01-14 | Minnesota Mining And Manufacturing Company | Encapsulated electroluminescent phosphor and method for making same |
| US5958591A (en) * | 1997-06-30 | 1999-09-28 | Minnesota Mining And Manufacturing Company | Electroluminescent phosphor particles encapsulated with an aluminum oxide based multiple oxide coating |
| KR100366887B1 (en) * | 1997-10-27 | 2003-03-26 | 오스람 실바니아 인코포레이티드 | Phosphor coating method for electroluminescence and phosphors manufactured accordingly |
| JPH11263971A (en) * | 1998-03-19 | 1999-09-28 | Nichia Chem Ind Ltd | Iron-activated lithium aluminate fluorescent substance and its fluorescent lamp |
| US20130279133A1 (en) * | 2012-04-23 | 2013-10-24 | Fujitsu Limited | Electronic device |
| US9681547B2 (en) * | 2012-04-23 | 2017-06-13 | Fujitsu Limited | Electronic device |
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