JP2879707B2 - Multi-color EL element - Google Patents
Multi-color EL elementInfo
- Publication number
- JP2879707B2 JP2879707B2 JP2248899A JP24889990A JP2879707B2 JP 2879707 B2 JP2879707 B2 JP 2879707B2 JP 2248899 A JP2248899 A JP 2248899A JP 24889990 A JP24889990 A JP 24889990A JP 2879707 B2 JP2879707 B2 JP 2879707B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- filter
- green
- red
- zns
- 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 - Lifetime
Links
- 239000010410 layer Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 5
- 239000002356 single layer Substances 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims description 2
- 230000003081 coactivator Effects 0.000 claims 1
- 150000002500 ions Chemical class 0.000 description 11
- 239000010408 film Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000003086 colorant Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000295 emission spectrum Methods 0.000 description 3
- 238000005090 crystal field Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
- Luminescent Compositions (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、マルチカラーELディスプレイに有用なマル
チカラーEL素子に関する。Description: TECHNICAL FIELD The present invention relates to a multicolor EL device useful for a multicolor EL display.
〔従来の技術〕 薄膜EL素子は、平板で薄く、大面積形状の表示パネル
ができるので、数字表示から図形表示、画像表示と幅広
い用途が考えられ、近年脚光を浴びているが、多くの情
報を表示するためにはそのマルチカラー化が必要とさ
れ、その実現のために母材や発光中心についても多くの
研究がなされている。[Prior art] Thin-film EL devices can be used as flat, thin, large-area display panels, and are expected to be used in a wide range of applications from numeric display to graphic display and image display. In order to display, a multi-color display is required, and many studies have been made on a base material and a luminescent center for realizing the display.
マルチカラーEL素子としては、従来、第6図に示すよ
うに、黄橙色発光を示すZnS:Mnの発光層(d1)と緑色発
光を示すZnS:TbF発光層(d2)とを交互に並置して形成
するものが提案されてきた(例えば、特開平1−221891
号公報)。このように構成すれば、電圧を印加する画素
を選ぶことによって、2種類の発光色が得られる。Conventionally, as a multicolor EL element, as shown in FIG. 6, a ZnS: Mn light-emitting layer (d 1 ) that emits yellow-orange light and a ZnS: TbF light-emitting layer (d 2 ) that emits green light are alternately arranged. A device formed side by side has been proposed (for example, Japanese Patent Application Laid-Open No. 1-222191).
No.). With this configuration, two types of emission colors can be obtained by selecting a pixel to which a voltage is applied.
しかしながら、これを実現するためには、ガラス基板
(a)上にITO等の透明電極(b)と誘電体からなる第
1絶縁膜(c)を順次積層した後、まずZnS:Mn(あるい
はZnS:TbF)を成膜し、これをフォトリソグラフィー、
エッチングによってパターニングし、次にZnS:TbF(あ
るいはZnS:Mn)について同様の工程を行う必要があり、
その後第2絶縁膜(e)及び背面電極(f)を積層す
る。従って、発光層の成膜工程が繁雑となり、またこの
方式では一般に、警告色表示等に用いられる色純度の良
い赤色発光が得られないという問題がある。However, in order to realize this, a transparent electrode (b) such as ITO and a first insulating film (c) made of a dielectric material are sequentially stacked on a glass substrate (a), and then ZnS: Mn (or ZnS: : TbF) and photolithography,
It is necessary to pattern by etching and then perform the same process for ZnS: TbF (or ZnS: Mn),
After that, the second insulating film (e) and the back electrode (f) are laminated. Therefore, the process of forming the light emitting layer becomes complicated, and this method generally has a problem that red light emission with good color purity used for warning color display or the like cannot be obtained.
従って、本発明の目的は、上記のような従来の問題を
解消し、簡単な工程で赤色から緑色にわたる広範な色純
度の良い表示色を持つマルチカラーEL素子を提供するこ
とにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned conventional problems and to provide a multi-color EL element having a wide range of display colors from red to green with high color purity by simple steps.
本発明のマルチカラーEL素子においては、前記目的を
達成するために、ZnSを母材とし、発光中心としてTb、M
nをそれぞれTb0.2〜0.8at%(原子%、以下同じ)、Mn
0.1〜0.4at%、共付活剤としてFを0〜0.3at%ドープ
した単層膜を発光層に用い、これと赤色フィルター及び
緑色フィルターを組み合せる。このとき、上記両フィル
ターは光の取り出し経路上に配置する。In the multicolor EL device of the present invention, in order to achieve the above object, ZnS is used as a base material, and Tb, M
n is Tb 0.2 to 0.8 at% (atomic%, the same applies hereinafter), Mn
A single layer film doped with 0.1 to 0.4 at% and F as a co-activator at 0 to 0.3 at% is used for a light emitting layer, and a red filter and a green filter are combined. At this time, the two filters are arranged on a light extraction path.
上記ZnS:Tb,Mn,F発光層からはTb3+イオンに起因する
緑色発光と、Mn2+イオンに起因していると思われる赤色
発光が合成された発光が得られる。このとき、F-1イオ
ンはTb3+イオンによる緑色発光の強度を高め、Mn+2イオ
ンの発光スペクトルを長波長側にシフトさせる。従っ
て、赤から緑にわたる広範な発光スペクトルが得られ
る。From the ZnS: Tb, Mn, F light emitting layer, light emission in which green light emission caused by Tb 3+ ions and red light emission considered to be caused by Mn 2+ ions are synthesized is obtained. At this time, the F -1 ion increases the intensity of green light emission by the Tb 3+ ion, and shifts the emission spectrum of the Mn +2 ion to a longer wavelength side. Therefore, a broad emission spectrum from red to green is obtained.
本来、Mn2+イオンは黄橙色発光を行うが、これは3d電
子の遷移による発光であるため、発光色は周囲の結晶場
の影響を受け易い。本発明の発光層においても、近傍の
Tb3+イオンあるいはF-1イオンの結晶場の影響を受けて
おり、赤色発光はこの結果であると考えられる。Originally, Mn 2+ ion emits yellow-orange light. However, since this is light emission due to transition of 3d electrons, the light emission color is easily affected by the surrounding crystal field. Also in the light emitting layer of the present invention,
Red light emission is considered to be the result of being affected by the crystal field of Tb 3+ ion or F −1 ion.
この赤から緑にわたる広範なスペクトルを持つ発光
は、赤と緑のカラーフィルターによって分離され、色純
度の良い赤色光、緑色光として外に取り出される。勿
論、この場合に階調表示を用いることによって、中間色
も得ることができる。The emitted light having a broad spectrum from red to green is separated by red and green color filters, and extracted outside as red light and green light with good color purity. Of course, in this case, an intermediate color can be obtained by using the gradation display.
第3図は、ZnS:Tb,Mn,F発光層(Mn濃度は0.2at%、F
濃度は0at%)のEL素子のTb濃度とフィルターで分離し
た緑色輝度の関係を示すグラフ、第4図はZnS:Tb,Mn,F
発光層(Tb濃度は0.4at%、F濃度は0at%)のEL素子の
Mn濃度とフィルターで分離した赤色輝度の関係を示すグ
ラフである。また、第5図はZnS:Tb,Mn,F発光層(Tb濃
度は0.4at%、Mn濃度は0.2at%)のEL素子のF濃度とフ
ィルターで分離した緑色光(実線)と赤色光(破線)の
鮮度の関係を示すグラフである。FIG. 3 shows a ZnS: Tb, Mn, F light emitting layer (Mn concentration: 0.2 at%, F:
FIG. 4 is a graph showing the relationship between the Tb concentration of the EL element of 0 at% and the green luminance separated by the filter, and FIG. 4 shows ZnS: Tb, Mn, F.
EL element of light emitting layer (Tb concentration is 0.4at%, F concentration is 0at%)
5 is a graph showing a relationship between Mn concentration and red luminance separated by a filter. FIG. 5 shows the F concentration of the EL element of the ZnS: Tb, Mn, F light emitting layer (Tb concentration: 0.4 at%, Mn concentration: 0.2 at%) and green light (solid line) and red light (solid line) separated by a filter. It is a graph which shows the relationship of the freshness of a broken line).
第3図〜第5図に示されるように、Tb、Mn、Fの濃度
がそれぞれ0.2〜0.8at%、0.1〜0.4at%、0〜0.3at%
のとき、前記作用が有効に起り、高輝度の赤色発光、緑
色発光が得られる。As shown in FIGS. 3 to 5, the concentrations of Tb, Mn, and F were 0.2 to 0.8 at%, 0.1 to 0.4 at%, and 0 to 0.3 at%, respectively.
In this case, the above-mentioned action is effectively performed, and high-luminance red light emission and green light emission are obtained.
尚、Fに関しては、Tbの電荷補償の意味(Zn2+とこれ
を置換するTb3+との価数差を補償し、電気的中性を保
つ)があり、EL素子の長寿命化に寄与する。In addition, F has a meaning of charge compensation of Tb (compensating for the valence difference between Zn 2+ and Tb 3+ which replaces it, and maintaining electrical neutrality), and the life of the EL element is extended. Contribute.
以下、実施例を示して本発明について具体的に説明す
るが、本発明が下記実施例に限定されるものでないこと
はもとよりである。Hereinafter, the present invention will be described in detail with reference to examples. However, it goes without saying that the present invention is not limited to the following examples.
本発明の第1の実施例を第1図に示す。まず、ガラス
基板(1)にカラーフィルター(2)及びITOからなる
透明電極(3)を順次積層する。カラーフィルターは、
赤色フィルターをR、緑色フィルターをGで示してあ
る。次いで、第1絶縁膜(4)としてスパッタ法により
Ta2O5を5000Å形成した後、真空蒸着法により6000ÅのZ
nS:Tb,Mn,F発光層(5)を形成し、次いで第2絶縁膜
(6)を上記第1絶縁膜と同様に形成し、最後にアルミ
ニウムからなる背面電極(7)を形成する。FIG. 1 shows a first embodiment of the present invention. First, a color filter (2) and a transparent electrode (3) made of ITO are sequentially laminated on a glass substrate (1). The color filter is
The red filter is indicated by R and the green filter by G. Next, the first insulating film (4) is formed by sputtering.
After forming 5000 2 of Ta 2 O 5 , 6000Z of Z by vacuum evaporation
An nS: Tb, Mn, F light emitting layer (5) is formed, a second insulating film (6) is formed in the same manner as the first insulating film, and finally a back electrode (7) made of aluminum is formed.
透明電極(3)と背面電極(7)との間に電圧を印加
すると、赤色フィルター(R)を通して赤色光が、緑色
フィルター(G)を通して緑色光が取り出される。When a voltage is applied between the transparent electrode (3) and the back electrode (7), red light is extracted through the red filter (R) and green light is extracted through the green filter (G).
フィルターの組合せ方は上記方式に限らず、第2図に
示す方法でも良い。この場合、ガラス基板(1)上に背
面電極(7)が積層され、一方、透明電極(3)は第2
絶縁膜(6)上に積層され、その上にカラーフィルター
(2)が積層される。赤色光及び緑色光は、それぞれ上
部に配設された赤色フィルター(R)及び緑色フィルタ
ー(G)を通して上方に取り出される。The method of combining the filters is not limited to the above method, but may be the method shown in FIG. In this case, the back electrode (7) is laminated on the glass substrate (1), while the transparent electrode (3) is the second electrode.
The color filter (2) is laminated on the insulating film (6). The red light and the green light are respectively extracted upward through a red filter (R) and a green filter (G) disposed at the top.
以上のように、本発明のマルチカラーEL素子は、ZnS:
Tb,Mn,Fの単層膜の発光層と緑色フィルター及び赤色フ
ィルターを組み合わせたものであり、F-1イオンがTb3+
イオンの緑色発光の強度を高めるのみならず、Mn2+イオ
ンに作用してその発光スペクトルを長波長側にシフトさ
せるから、赤から緑にわたる広範な色純度の良い表示色
が得られ、また階調表示を用いることによってこれらの
中間色も得られる。しかも、発光層は単層であるから、
従来のマルチカラーEL素子に比べて簡単な工程で製造で
き、生産性にも優れている。As described above, the multicolor EL device of the present invention has ZnS:
Tb, Mn, is a combination of a single-layer light-emitting layer and a green filter and a red filter, F- 1 ion is Tb 3+
In addition to increasing the green emission intensity of the ions, they act on Mn 2+ ions to shift the emission spectrum to longer wavelengths, so that a wide range of display colors with good color purity from red to green can be obtained, and By using the tonal display, these intermediate colors can also be obtained. Moreover, since the light emitting layer is a single layer,
Compared to conventional multi-color EL elements, it can be manufactured with simpler processes and has excellent productivity.
また、なかでもTb,Mn,Fを0.2〜0.8、0.1〜0.4、0〜0.3
at%とした場合には、以上の効果が特に顕著となる。Also, among them, Tb, Mn, F are 0.2 to 0.8, 0.1 to 0.4, 0 to 0.3
In the case of at%, the above effects are particularly remarkable.
第1図は本発明のマルチカラーEL素子の一実施例を示す
概略構成図、第2図は他の実施例を示す概略構成図、第
3図乃至第5図はそれぞれZnS:Tb,Mn,F発光層を持つEL
素子のTb濃度とフィルターで分離した緑色輝度の関係を
示すグラフ、Mn濃度とフィルターで分離した赤色輝度の
関係を示すグラフ、及びF濃度とフィルターで分離した
緑色光と赤色光の輝度の関係を示すグラフ、第6図は従
来のマルチカラーEL素子の概略構成図である。 1はガラス基板、2はカラーフィルター、3は透明電
極、4は第1絶縁膜、5はZnS:Tb,Mn,F発光層、6は第
2絶縁膜、7は背面電極。FIG. 1 is a schematic diagram showing one embodiment of the multicolor EL device of the present invention, FIG. 2 is a schematic diagram showing another embodiment, and FIGS. 3 to 5 are ZnS: Tb, Mn, respectively. EL with F light emitting layer
A graph showing the relationship between the Tb concentration of the device and the green luminance separated by the filter, a graph showing the relationship between the Mn concentration and the red luminance separated by the filter, and the relationship between the F concentration and the luminance of the green light and the red light separated by the filter. FIG. 6 is a schematic configuration diagram of a conventional multicolor EL device. 1 is a glass substrate, 2 is a color filter, 3 is a transparent electrode, 4 is a first insulating film, 5 is a ZnS: Tb, Mn, F light emitting layer, 6 is a second insulating film, and 7 is a back electrode.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) H05B 33/14 H05B 33/22 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H05B 33/14 H05B 33/22
Claims (2)
共付活剤としてFを含む単層膜からなる発光層と、緑色
フィルター及び赤色フィルターを組み合せたことを特徴
とするマルチカラーEL素子。1. A luminescent material comprising ZnS as a base material and Tb, Mn,
A multicolor EL device comprising a combination of a light-emitting layer comprising a single-layer film containing F as a coactivator, a green filter and a red filter.
それぞれTb0.2〜0.8at%、Mn0.1〜0.4at%、共付活剤と
してFを0〜0.3at%含む単層膜からなる発光層と、緑
色フィルター及び赤色フィルターを組み合せたことを特
徴とするマルチカラーEL素子。2. A single layer containing ZnS as a base material, containing Tb and Mn of 0.2 to 0.8 at% and Mn of 0.1 to 0.4 at% as emission centers and F of 0 to 0.3 at% as a co-activator, respectively. A multicolor EL device comprising a combination of a light emitting layer comprising a film, a green filter and a red filter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2248899A JP2879707B2 (en) | 1990-09-20 | 1990-09-20 | Multi-color EL element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2248899A JP2879707B2 (en) | 1990-09-20 | 1990-09-20 | Multi-color EL element |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04129193A JPH04129193A (en) | 1992-04-30 |
JP2879707B2 true JP2879707B2 (en) | 1999-04-05 |
Family
ID=17185092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2248899A Expired - Lifetime JP2879707B2 (en) | 1990-09-20 | 1990-09-20 | Multi-color EL element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2879707B2 (en) |
-
1990
- 1990-09-20 JP JP2248899A patent/JP2879707B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04129193A (en) | 1992-04-30 |
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