JPH03280394A - Thin film type electroluminescence element - Google Patents

Thin film type electroluminescence element

Info

Publication number
JPH03280394A
JPH03280394A JP2077096A JP7709690A JPH03280394A JP H03280394 A JPH03280394 A JP H03280394A JP 2077096 A JP2077096 A JP 2077096A JP 7709690 A JP7709690 A JP 7709690A JP H03280394 A JPH03280394 A JP H03280394A
Authority
JP
Japan
Prior art keywords
thin film
light emission
layer
complex ion
film type
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
Application number
JP2077096A
Other languages
Japanese (ja)
Inventor
Koji Deguchi
浩司 出口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2077096A priority Critical patent/JPH03280394A/en
Publication of JPH03280394A publication Critical patent/JPH03280394A/en
Pending legal-status Critical Current

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  • Electroluminescent Light Sources (AREA)

Abstract

PURPOSE:To make an EL material which emits efficiently a blue color with good tone, by using a fluorescent substance having a complex ion light emission center to an EL layer. CONSTITUTION:As a transparent electrode 2 an ITO is formed on a glass base board 1, while a CaWO4 film is formed as a light emitting layer 3 by the RF sputter method, and thereover Y2O3 is formed as an insulative layer 4 by the electron beam evaporation method. A blue colored light emission as not achieved by any conventional technique is obtained by energizing the formed thin film type EL element with a voltage of 5kHz. This demonstrates possibility of using a fluorescent substance having complex ion light emission center as the light emitting layer even in electroluminescence of thin film type, and it is practicable to fabricate elements emitting different colors through the use of other complex ion light emission centers.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は薄膜エレクトロルミネッセンス素子(以下薄膜
EL素子と略記する)に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a thin film electroluminescent device (hereinafter abbreviated as a thin film EL device).

[従来の技術] フルカラー表示のELデイスプレィに用いられる発光材
料、特に青色の発光層材料が従来存在しなかった。
[Prior Art] Conventionally, there have been no luminescent materials, particularly blue luminescent layer materials, used in full-color EL displays.

発光層材料には螢光材料が用いられており、その発光色
は螢光体の発光色とほぼ同様である。
A fluorescent material is used as the material for the light-emitting layer, and its luminescent color is almost the same as that of the phosphor.

螢光体の分野では、その発光機構を分類すると、 (1)ドナーアクセプタ一対(D−Aペア)発光、(2
)希土類や遷移金属イオン等を発光中心とした発光、 (3)錯イオンを発光中心とした発光、に分類される。
In the field of fluorophores, their luminescence mechanisms can be classified into: (1) donor-acceptor pair (D-A pair) luminescence;
) Luminescence centered on rare earth or transition metal ions, etc., and (3) Luminescence centered on complex ions.

従来、錯イオンを発光中心とした発光を薄膜EL索子に
利用した例はなかった。
Conventionally, there has been no example of utilizing light emission centered on complex ions in a thin film EL string.

[発明が解決しようとする課WrJ] 本発明は、フルカラー表示のELデイスプレィを実現す
るために、色調のよい青色発光をし、かつ、発光効率の
よいEL発光材料を提供しようとするものである。
[Problem to be solved by the invention WrJ] The present invention aims to provide an EL light-emitting material that emits blue light with good color tone and has high luminous efficiency in order to realize a full-color EL display. .

[課題を解決するための手段] 上記課題を解決するための本発明の構成は、透明な基板
上に形成された、透光性の縞状電極上に、少なくとも片
側に絶縁層を備えたEL発光層を有し、その上に上記縞
状電極と直交する縞状電極を有する薄膜EL素子におい
て、上記EL発光層が発光中心として錯イオンを含有す
る螢光体材料からなる薄膜である薄膜EL素子である。
[Means for Solving the Problems] The structure of the present invention for solving the above problems is an EL device having an insulating layer on at least one side on a light-transmitting striped electrode formed on a transparent substrate. A thin film EL device having a light emitting layer and having striped electrodes thereon perpendicular to the striped electrodes, wherein the EL light emitting layer is a thin film made of a phosphor material containing a complex ion as a light emitting center. It is element.

錯イオン発光中心を有する螢光体材料の中でも青色発光
を示す材料としてはCaWO4(タングステン酸カルシ
ウム)が最も適しているので、ここではこの材料につい
てのみ言及するが、もちろん他の材料であっても、発光
波長が青色であれば同様な効果が得られる。更に他の発
光色についても、同様な材料系を用いることができる。
Among the phosphor materials having a complex ion luminescent center, CaWO4 (calcium tungstate) is the most suitable as a material that emits blue light, so we will only mention this material here, but of course other materials may also be used. Similar effects can be obtained if the emission wavelength is blue. Furthermore, similar material systems can be used for other luminescent colors as well.

本発明の薄膜EL素子の発光層の作製方法は特に限定さ
れないが、多元化合物であることから、スパッタ法やC
VD法を用いることが望ましい。
The method for producing the light-emitting layer of the thin-film EL device of the present invention is not particularly limited, but since it is a multi-component compound, sputtering method, carbon
It is desirable to use the VD method.

更に薄膜EL素子の構造としては、何ら制限されること
はなく、従って、従来用いられている構造、材料を用い
てもよい。
Further, the structure of the thin film EL element is not limited in any way, and therefore, conventionally used structures and materials may be used.

以下、本発明を実施例によって具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.

[実施例] ここでは第1図に示すような構造を有する薄膜EL素子
を作製した。ガラス基板上lに透明電極2としてITO
を形成し、次に発光層3としてCa W O4薄膜をR
Fスパッタ法により作製した。そして発光層形成後、絶
縁層4としてY2O:l(酸化イツトリウム)を電子ビ
ーム蒸着法により形成した。
[Example] Here, a thin film EL element having a structure as shown in FIG. 1 was manufactured. ITO as transparent electrode 2 on glass substrate
Then, a Ca WO 4 thin film was formed as the light emitting layer 3.
It was manufactured by F sputtering method. After forming the light emitting layer, Y2O:l (yttrium oxide) was formed as the insulating layer 4 by electron beam evaporation.

このようにして得られた薄膜EL索子の発光輝度−印加
電圧(L−V)特性を第2図に示す。
FIG. 2 shows the luminance-applied voltage (LV) characteristics of the thin film EL cord thus obtained.

素子の励起には5Kllzの制限は電圧を印加した。A voltage with a limit of 5 Kllz was applied to excite the device.

次に第3図にELスペクトルを示す。このスペクトルか
らもわかるように発光色は青色を示した。
Next, FIG. 3 shows the EL spectrum. As can be seen from this spectrum, the emission color was blue.

以上のように発光層にCa W 04を用いることで従
来技術では得られなかった青色発光が実現できた。これ
は薄膜ELにおいても錯イオン発光中心を有する螢光体
を発光層に用いることができることを示しており、他の
錯イオン発光中心により、種々の発光色を示す薄膜EL
素子が作製可能である。
As described above, by using Ca W 04 in the light emitting layer, blue light emission, which could not be obtained with the conventional technology, was realized. This shows that a phosphor having a complex ion luminescent center can be used in the luminescent layer even in thin film EL, and it is possible to use a phosphor having a complex ion luminescent center in the luminescent layer.
The device can be manufactured.

[発明の効果] 以上説明したように錯イオン発光中心を有する螢光体を
EL発光層に用いることで、従来実現できなかったEL
特性、特に青色発光が実現できた。
[Effect of the invention] As explained above, by using a phosphor having a complex ion luminescent center in the EL emitting layer, EL, which could not be realized in the past, can be achieved.
We were able to realize the characteristics, especially blue light emission.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の薄膜EL素子の構造の一例を示す断面
の模式図、 第2図は実施例のEL発光素子の発光輝度と印加電圧(
L−V)特性の関係を示すグラフ、第3図は同じ〈実施
例のEL発光素子のELスペクトルを示すグラフである
。 ■・・・ガラス基板、2・・・透明電極、3・・・発光
層、4・・・絶縁層、5・・・背面電極。 第 図 ζ 第2 図 印加電圧Vrms(V)
FIG. 1 is a schematic cross-sectional view showing an example of the structure of the thin film EL device of the present invention, and FIG. 2 is a diagram showing the luminance and applied voltage (
FIG. 3 is a graph showing the EL spectrum of the EL light emitting device of the same example. ■...Glass substrate, 2...Transparent electrode, 3...Light emitting layer, 4...Insulating layer, 5...Back electrode. Figure ζ Figure 2 Applied voltage Vrms (V)

Claims (1)

【特許請求の範囲】[Claims]  透明な基板上に形成された透光性の縞状電極上に、少
なくとも片側に絶縁層を備えたエレクトロルミネッセン
ス発光層を有し、その上に上記縞状電極と直交する縞状
電極を有する薄膜エレクトロルミネッセンス素子におい
て、上記エレクトロルミネッセンス発光層が発光中心と
して錯イオンを含有する螢光体材料からなる薄膜である
ことを特徴とする薄膜エレクトロルミネッセンス素子。
A thin film having an electroluminescence emitting layer with an insulating layer on at least one side on a light-transmitting striped electrode formed on a transparent substrate, and having a striped electrode orthogonal to the striped electrode on top of the electroluminescent layer. 1. A thin film electroluminescent device, wherein the electroluminescent layer is a thin film made of a phosphor material containing complex ions as a luminescent center.
JP2077096A 1990-03-28 1990-03-28 Thin film type electroluminescence element Pending JPH03280394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2077096A JPH03280394A (en) 1990-03-28 1990-03-28 Thin film type electroluminescence element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2077096A JPH03280394A (en) 1990-03-28 1990-03-28 Thin film type electroluminescence element

Publications (1)

Publication Number Publication Date
JPH03280394A true JPH03280394A (en) 1991-12-11

Family

ID=13624253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2077096A Pending JPH03280394A (en) 1990-03-28 1990-03-28 Thin film type electroluminescence element

Country Status (1)

Country Link
JP (1) JPH03280394A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5643685A (en) * 1993-10-26 1997-07-01 Fuji Xerox Co., Ltd. Thin film electroluminescence element and process for producing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5643685A (en) * 1993-10-26 1997-07-01 Fuji Xerox Co., Ltd. Thin film electroluminescence element and process for producing the same

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