JPH01302691A - Dispersed type electroluminescent element - Google Patents
Dispersed type electroluminescent elementInfo
- Publication number
- JPH01302691A JPH01302691A JP63132419A JP13241988A JPH01302691A JP H01302691 A JPH01302691 A JP H01302691A JP 63132419 A JP63132419 A JP 63132419A JP 13241988 A JP13241988 A JP 13241988A JP H01302691 A JPH01302691 A JP H01302691A
- Authority
- JP
- Japan
- Prior art keywords
- green
- emitting layer
- red
- light emitting
- blue
- 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
- 239000000843 powder Substances 0.000 claims abstract description 37
- 239000005132 Calcium sulfide based phosphorescent agent Substances 0.000 claims abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000000049 pigment Substances 0.000 abstract description 11
- 239000011230 binding agent Substances 0.000 abstract description 9
- 239000011347 resin Substances 0.000 abstract description 8
- 229920005989 resin Polymers 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000007606 doctor blade method Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract 2
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical compound ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000011514 reflex Effects 0.000 abstract 1
- 229950011008 tetrachloroethylene Drugs 0.000 abstract 1
- 238000000295 emission spectrum Methods 0.000 description 9
- 239000010408 film Substances 0.000 description 9
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- KXJGSNRAQWDDJT-UHFFFAOYSA-N 1-acetyl-5-bromo-2h-indol-3-one Chemical compound BrC1=CC=C2N(C(=O)C)CC(=O)C2=C1 KXJGSNRAQWDDJT-UHFFFAOYSA-N 0.000 description 2
- 239000005083 Zinc sulfide Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- NYZGMENMNUBUFC-UHFFFAOYSA-N P.[S-2].[Zn+2] Chemical compound P.[S-2].[Zn+2] NYZGMENMNUBUFC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は分散型電界発光素子の白色表示品質の改良に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improving the white display quality of a distributed electroluminescent device.
液晶デイスプレィのバックライト等として使用される従
来の一般的な分散型電界発光素子は、背面電極、反射絶
縁層、発光層、透明電極、透明樹脂フィルムを順次積層
して、これを透明な外皮フィルムで封止した構造をして
おり、白色発光させるために、例えば第５図の発光スペ
クトル（曲線Ａ）のような青色領域を若干含んだ緑色発
光の硫化亜鉛系蛍光体粉末にピンク系の蛍光顔料を混合
した発光材料を使用し、これを上記の発光層中に分散状
態で含有させている。この発光材料は、蛍光顔料によっ
て硫化亜鉛系蛍光体粉末の青色領域のピークを残したま
ま緑色領域のピークを赤色領域の方へ色変換して白色発
光させるもので、第５図に示すような互いに補色関係の
２ピークからなる発光スペクトル（曲線Ｂ）を存してい
る。しかしながら、かかる発光材料を用いた従来の分散
型電界発光素子では、次のような問題があった。A conventional general distributed electroluminescent device used as a backlight for a liquid crystal display, etc. consists of a back electrode, a reflective insulating layer, a light emitting layer, a transparent electrode, and a transparent resin film, which are laminated in sequence, and then covered with a transparent outer film. In order to emit white light, for example, a zinc sulfide-based phosphor powder that emits green light with a slight blue region as shown in the emission spectrum (curve A) in Figure 5 is combined with a pink fluorescent powder. A luminescent material mixed with a pigment is used and is contained in the luminescent layer in a dispersed state. This luminescent material uses a fluorescent pigment to convert the peak in the green region to the red region while leaving the peak in the blue region of zinc sulfide-based phosphor powder to emit white light, as shown in Figure 5. It has an emission spectrum (curve B) consisting of two peaks with mutually complementary colors. However, conventional distributed electroluminescent devices using such luminescent materials have the following problems.
一つの問題は、上記発光材料の発光スペクトル（曲線Ｂ
）が緑色領域にピークをもたない２ビークの曲線である
ため、仮にこの電界発光素子をカラー液晶デイスプレィ
のバックライトとして使用してＲＧＢ （赤、緑、青）
のフィルターを通しても緑色表示が不可能であり、従っ
て、カラー液晶デイスプレィのバンクライトとして使用
できないことである。One problem is that the emission spectrum (curve B
) is a two-beak curve with no peak in the green region. Therefore, if this electroluminescent device is used as a backlight for a color liquid crystal display, RGB (red, green, blue)
It is impossible to display green color even through a filter, and therefore it cannot be used as a bank light for a color liquid crystal display.
もう一つの問題は、上記発光材料のように蛍光顔料が混
合されていると、この蛍光顔料が経時的に色ずれを起こ
し、白色表示品質が低下することである。Another problem is that when a fluorescent pigment is mixed like the above-mentioned luminescent material, the fluorescent pigment causes color shift over time and the quality of white display deteriorates.
本発明の分散型電界発光素子は、−１−記問題を解決す
ることを目的としてなされたもので、発光層中に、発光
材として５ｒＳｓＣｅ系蛍光体粉末とＣａ Ｓ ： Ｅ
ｕ系蛍光体粉末を分散状態で含有させたことを特徴と
する。The dispersion type electroluminescent device of the present invention was made for the purpose of solving the problem described in -1-, and contains 5rSsCe-based phosphor powder and CaS:E as luminescent materials in the luminescent layer.
It is characterized by containing U-based phosphor powder in a dispersed state.
〔作 用）
本発明の分散型電界発光素子によれば、第４図に示すよ
うに、ＳｒＳ：Ｃｅ系蛍光体粉末の発光スペクトル（曲
線Ｃ）が青色領域と緑色領域の双方にピークを持ち、Ｃ
ａ Ｓ ： Ｅｕ系蛍光体粉末の発光スペクトル（曲線
Ｄ）が赤色領域にピークを持つため、ＳｒＳ：Ｃｅ系蛍
光体粉末から青色と緑色が発光し、ＣａＳ：Ｅｕ系蛍光
体粉末から赤色が発光する。従って、全体として赤、緑
、青の各領域にピークを有する３ビークの白色発光が行
われるので、カラー液晶デイスプレィのバックライトと
して使用することができる。[Function] According to the distributed electroluminescent device of the present invention, as shown in FIG. 4, the emission spectrum (curve C) of the SrS:Ce-based phosphor powder has peaks in both the blue region and the green region. , C
aS: Since the emission spectrum (curve D) of the Eu-based phosphor powder has a peak in the red region, blue and green light is emitted from the SrS:Ce-based phosphor powder, and red light is emitted from the CaS:Eu-based phosphor powder. do. Therefore, as a whole, three peaks of white light emission having peaks in the red, green, and blue regions are emitted, so that it can be used as a backlight for a color liquid crystal display.
また、蛍光顔料を一切含まないので、経時的に色ずれを
起こして白色表示品質の低下を招く恐れもなくなる。Furthermore, since it does not contain any fluorescent pigment, there is no risk of color shift occurring over time and deterioration of white display quality.
以下、図面を参照しながら本発明の実施例を詳述する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の一実施例にかかる分散型ＡＣ電界発光
素子の断面図である。この電界発光素子は、背面電極１
、反射絶縁層２、発光層３、透明電極４、透明樹脂フィ
ルム５を一体に積層し、この積層体を上下から透明な三
弗化塩化エチレン樹脂フィルム等の外皮フィルム６で封
止した構造をしており、背面電極１と透明電極４からそ
れぞれリード（図示せず）が外部へ導出されている。FIG. 1 is a cross-sectional view of a distributed AC electroluminescent device according to an embodiment of the present invention. This electroluminescent device has a back electrode 1
, a structure in which a reflective insulating layer 2, a light emitting layer 3, a transparent electrode 4, and a transparent resin film 5 are laminated together, and this laminate is sealed from above and below with an outer skin film 6 such as a transparent trifluorochloride ethylene resin film. Leads (not shown) are led out from the back electrode 1 and the transparent electrode 4, respectively.
」二組の背面電極１は例えばアルミニウム箔等の金属箔
より成り、その上の反射絶縁層２は、例えばシアノエチ
ルセルロース等の高誘電率の有１バインダにチタン酸バ
リウム等の白色高誘電率の絶縁体粉末を分散させたもの
をドクターブレード法等の手段で塗布して形成したもの
である。また、透明樹脂シート５は例えばポリエステル
フィルム等より成るもので、その下面の透明電極４は、
例えば１．Ｔ、Ｏ等の金属酸化物を蒸着等の手段によっ
て薄膜状に形成したものである。The two sets of back electrodes 1 are made of metal foil such as aluminum foil, and the reflective insulating layer 2 thereon is made of a white high dielectric constant material such as barium titanate in a high dielectric constant binder such as cyanoethyl cellulose. It is formed by applying a dispersion of insulating powder using a method such as a doctor blade method. Further, the transparent resin sheet 5 is made of, for example, a polyester film, and the transparent electrode 4 on the lower surface is
For example 1. A metal oxide such as T or O is formed into a thin film by means such as vapor deposition.
この分散型電界発光素子の発光Ｎ３は、青緑色発光する
ＳｒＳ二Ｃｅ系蛍光体粉末と赤色発光するＣａＳ：Ｅｕ
系蛍光体粉末を混合して高誘電率の有機バインダに分散
させ、これをドクターブレード法等の手段で塗布して層
状に形成したものであり、従って１、この発光層３ （
ＳｒＳ：Ｃｅ＋Ｃａｓ：Ｅｕ）中には、上記の螢光体粉
末が分散状態で有機バインダにより結合されて含まれて
いる。The light emission N3 of this dispersed electroluminescent device consists of SrS2Ce-based phosphor powder that emits blue-green light and CaS:Eu that emits red light.
The light-emitting layer 3 (1) is formed by mixing a phosphor powder, dispersing it in an organic binder with a high dielectric constant, and coating it by means such as a doctor blade method to form a layer.
SrS:Ce+Cas:Eu) contains the above-mentioned phosphor powder in a dispersed state and bound by an organic binder.
５ｒＳｓＣｅ系蛍光体粉末としては、例えばＳｒＳ：Ｃ
ｅ、Ｃ１，、ＳｒＳ：Ｃｅ、Ｋ及びＳｒＳ ：Ｃｅ、Ｆ
等の粒径がミクロンオーダーである粉末が使用され、Ｃ
ａＳ：Ｅｕ系蛍光体粉末としては、例えばＣａＳ：Ｅｕ
、Ｃ７！、ＣａＳ：Ｅｕ、Ｋ及びＣａＳ：Ｅｕ、Ｆ等の
ミクロンオーダーの粉末が使用される。ＳｒＳ：Ｃｅ系
蛍光体粉末とＣａＳ：Ｅｕ系蛍光体粉末の混合比は重量
比でｌ：２〜１：２０の範囲とするのが望ましく、その
場合には青色、緑色、赤色の発光強度が最適な所望の白
色が得られるという利点がある。また、有機バインダと
してはシアノエチルセルロース等が好適に使用され、そ
の配合量は上記螢光体粉末に対し３０〜７０重景％の範
囲とするのが適当である。As the 5rSsCe-based phosphor powder, for example, SrS:C
e, C1,, SrS: Ce, K and SrS: Ce, F
Powders with particle sizes on the micron order are used, such as C
As the aS:Eu-based phosphor powder, for example, CaS:Eu
, C7! , CaS:Eu, K, CaS:Eu, F, and the like are used. The mixing ratio of the SrS:Ce-based phosphor powder and the CaS:Eu-based phosphor powder is preferably in the range of 1:2 to 1:20 by weight, in which case the blue, green, and red emission intensities are The advantage is that an optimal desired white color is obtained. Further, as the organic binder, cyanoethyl cellulose or the like is suitably used, and the amount thereof is suitably in the range of 30 to 70% by weight based on the phosphor powder.
以上のような構成の分散型電界発光素子は、発光層３中
のＳｒＳ：Ｃｅ系蛍光体粉末が第４図に示すような青色
領域と緑色領域の双方にピークを持つ発光スペクトル（
曲線Ｃ）を有するものであり、ＣａＳｘＥｕ系蛍光体粉
末が赤色領域にピークを持つ発光スペクトル（曲線Ｄ）
を有するものであるため、背面電極１と透明電極４の間
に交流電圧を印加して電界を生じさせると、ＳｒＳ ：
Ｃｅ系蛍光体粉末から青色と緑色が、ＣａＳ ＨＥｕ
系蛍光体粉末から赤色がそれぞれ発光し、全体として赤
、緑、青の各領域にピークを有する３ビークの白色発光
が行われる。従って、この分散型電界発光素子はカラー
液晶ダイスプレイのパックライトとして好適に使用する
ことができる。また、発光層３中に蛍光顔料を一切含ま
ないので、経時的に色ずれを起こして白色表示品質の低
下を招く恐れも全くない。In the dispersion type electroluminescent device having the above configuration, the SrS:Ce based phosphor powder in the light emitting layer 3 has an emission spectrum (
Curve C), and the emission spectrum of CaSxEu-based phosphor powder has a peak in the red region (curve D)
Therefore, when an AC voltage is applied between the back electrode 1 and the transparent electrode 4 to generate an electric field, SrS:
Blue and green colors from Ce-based phosphor powder are produced by CaS HEu
Red light is emitted from each of the phosphor powders, and three peaks of white light are emitted as a whole, with peaks in the red, green, and blue regions. Therefore, this distributed electroluminescent device can be suitably used as a pack light for a color liquid crystal display. Furthermore, since the light-emitting layer 3 does not contain any fluorescent pigment, there is no risk of color shift occurring over time and deterioration of white display quality.
上記実施例の分散型電界発光素子では、ＳｒＳ：Ｃｅ系
蛍光体粉末とＣａ５ｓＥｕ系蛍光体粉末の−様な混合粉
末を発光層中に分散させているが、例えば第２図に示す
ように、５ｒＳｓＣｅ系蛍光体粉末を有機バインダに分
散させた液と、Ｃａｓ：Ｅｕ系蛍光体粉末を有機バイン
ダに分散させた液を塗り分けて、青緑色発光領域３ａと
赤色発光領域３ｂを有する発光層を形成してもよく、ま
た、第３図に示すように、ＳｒＳ：Ｃｅ系蛍光体粉末を
有機バインダに分散させた液と、ＣａＳ：Ｅｕ系蛍光体
粉末を有機バインダに分散させた液を重ね塗りして、青
緑色発光層３Ｃと赤色発光層３ｄを有する二層構造の発
光層を形成してもよい。また、必要とあらば透明樹脂フ
ィルム５の上に吸湿性の良好なナイロンフィルム等を積
層し、侵入してくる水分を該フィルムで捕集し、水分に
よる悪影響を最小限に抑えるようにしてもよい。In the dispersed electroluminescent device of the above embodiment, a mixed powder such as SrS:Ce-based phosphor powder and Ca5sEu-based phosphor powder is dispersed in the light emitting layer. For example, as shown in FIG. A light-emitting layer having a blue-green light emitting region 3a and a red light-emitting region 3b is formed by separately applying a liquid in which 5rSsCe-based phosphor powder is dispersed in an organic binder and a liquid in which a Cas:Eu-based phosphor powder is dispersed in an organic binder. Alternatively, as shown in FIG. 3, a liquid in which SrS:Ce-based phosphor powder is dispersed in an organic binder and a liquid in which CaS:Eu-based phosphor powder is dispersed in an organic binder are layered. A two-layer light emitting layer having a blue-green light emitting layer 3C and a red light emitting layer 3d may be formed by coating. In addition, if necessary, a nylon film or the like with good moisture absorption may be laminated on the transparent resin film 5 to trap invading moisture with the film to minimize the adverse effects of moisture. good.
以上、分散型ＡＣ電界発光素子を例示して本発明を説明
したが、本発明は分散型ＤＣ電界発光素子にも適用され
ることは勿論である。Although the present invention has been described above using a distributed AC electroluminescent device as an example, it goes without saying that the present invention is also applicable to a distributed DC electroluminescent device.
以上の説明より明らかなように、本発明の分散型電界発
光素子は、発光層中にＳｒＳ ： Ｃｅ系蛍光体粉末と
Ｃａ Ｓ ｎ Ｅｕ系蛍光体粉末を分散状態で含有させ
たので、赤色、緑色、青色の領域でそれぞれピークを有
する３ビークの白色発光が可能となり、また、蛍光顔料
を一切含まないので蛍光顔料の色ずれによる白色表示品
質の低下を起こすこともないといった効果を奏する。従
って、本発明の分散型電界発光素子は、カラー液晶デイ
スプレィのバックライト等として頗る有用なものである
。As is clear from the above description, the dispersion type electroluminescent device of the present invention contains the SrS:Ce-based phosphor powder and the CaSnE-based phosphor powder in a dispersed state in the light-emitting layer, so that red, It is possible to emit three peaks of white light with peaks in the green and blue regions, and since it does not contain any fluorescent pigments, there is no deterioration in white display quality due to color shift of the fluorescent pigments. Therefore, the distributed electroluminescent device of the present invention is extremely useful as a backlight for a color liquid crystal display.
第１図は本発明の一実施例にかかる分散型電界発光素子
の断面図、第２図は発光層の他の例を示す部分断面図、
第３図は発光層の更に他の例を示す部分断面図、第４図
は本発明の分散型電界発光素子におけるＳｒＳ：Ｃｅ系
蛍光体とＣａＳ：ＥＵ系蛍光体の発光スペクトルを示す
グラフ、第５図は硫化亜鉛系蛍光体と、これにピンク系
螢光顔料を混合した発光材料を含む従来の分散型電界発
光素子の発光スペクトルを示すグラフである。
■・・・背面電極、
２・・・反射絶縁層、
３・・・発光層、
３ａ・・・青緑発光領域、
３ｂ・・・赤色発光領域、
３Ｃ・・・青緑発光層、
３ｄ・・・赤色発光層、
４・・・透明電極、
５・・・透明樹脂フィルム、
６・・・外皮フィルム、
第１図
第２図
第３図FIG. 1 is a cross-sectional view of a distributed electroluminescent device according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing another example of a light-emitting layer.
FIG. 3 is a partial cross-sectional view showing still another example of the light-emitting layer, and FIG. 4 is a graph showing the emission spectra of the SrS:Ce-based phosphor and CaS:EU-based phosphor in the distributed electroluminescent device of the present invention. FIG. 5 is a graph showing the emission spectrum of a conventional dispersion type electroluminescent device containing a luminescent material in which a zinc sulfide phosphor and a pink fluorescent pigment are mixed therein. ■... Back electrode, 2... Reflective insulating layer, 3... Light emitting layer, 3a... Blue-green light emitting region, 3b... Red light emitting region, 3C... Blue green light emitting layer, 3d. ...Red light emitting layer, 4...Transparent electrode, 5...Transparent resin film, 6...Outer film, Figure 1, Figure 2, Figure 3.
Claims (1)
体粉末とＣａＳ：Ｅｕ系蛍光体粉末を分散状態で含有さ
せたことを特徴とする分散型電界発光素子。(1) A dispersion type electroluminescent device characterized in that a light-emitting layer contains SrS:Ce-based phosphor powder and CaS:Eu-based phosphor powder as light-emitting materials in a dispersed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63132419A JPH01302691A (en) | 1988-05-30 | 1988-05-30 | Dispersed type electroluminescent element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63132419A JPH01302691A (en) | 1988-05-30 | 1988-05-30 | Dispersed type electroluminescent element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01302691A true JPH01302691A (en) | 1989-12-06 |
Family
ID=15080937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63132419A Pending JPH01302691A (en) | 1988-05-30 | 1988-05-30 | Dispersed type electroluminescent element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01302691A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030079331A (en) * | 2002-04-03 | 2003-10-10 | 대한민국 (한밭대학총장) | A manufacturing process and white light electro luminescence device |
| JP2006108090A (en) * | 2004-09-30 | 2006-04-20 | Osram Sylvania Inc | Electroluminescent lamp having high cri |
| US7749405B2 (en) * | 2004-09-30 | 2010-07-06 | Global Tungsten & Powders Corp. | White-emitting phosphor blend and electroluminescent lamp containing same |
-
1988
- 1988-05-30 JP JP63132419A patent/JPH01302691A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030079331A (en) * | 2002-04-03 | 2003-10-10 | 대한민국 (한밭대학총장) | A manufacturing process and white light electro luminescence device |
| JP2006108090A (en) * | 2004-09-30 | 2006-04-20 | Osram Sylvania Inc | Electroluminescent lamp having high cri |
| US7749405B2 (en) * | 2004-09-30 | 2010-07-06 | Global Tungsten & Powders Corp. | White-emitting phosphor blend and electroluminescent lamp containing same |
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