JPH11121165A - Organic electrouminescent element - Google Patents
Organic electrouminescent elementInfo
- Publication number
- JPH11121165A JPH11121165A JP9285004A JP28500497A JPH11121165A JP H11121165 A JPH11121165 A JP H11121165A JP 9285004 A JP9285004 A JP 9285004A JP 28500497 A JP28500497 A JP 28500497A JP H11121165 A JPH11121165 A JP H11121165A
- Authority
- JP
- Japan
- Prior art keywords
- wall
- organic
- laminated structure
- substrate
- lid
- 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.)
- Granted
Links
- 239000000758 substrate Substances 0.000 claims abstract description 68
- 239000003463 adsorbent Substances 0.000 claims abstract description 30
- 239000011261 inert gas Substances 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000001179 sorption measurement Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000005401 electroluminescence Methods 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 53
- 239000010410 layer Substances 0.000 abstract description 35
- 239000012790 adhesive layer Substances 0.000 abstract description 11
- 230000007774 longterm Effects 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 7
- 150000004706 metal oxides Chemical class 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000000576 coating method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000005525 hole transport Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 229920003319 Araldite® Polymers 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 229920000578 graft copolymer Polymers 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機ＥＬ素子に関
し、更に詳細には、長期間にわたり高い信頼性で発光動
作する有機ＥＬ素子に関するものである。[0001] 1. Field of the Invention [0002] The present invention relates to an organic EL device, and more particularly, to an organic EL device that emits light with high reliability over a long period of time.
【０００２】[0002]
【従来の技術】ディスプレイ等の画像表示装置の薄型化
を図る手段の一つとして、有機エレクトロルミネッセン
ス素子（以下、簡単に有機ＥＬ素子と言う）が注目され
ている。有機ＥＬ素子は、有機エレクトロルミネッセン
ス層（以下、簡単に有機ＥＬ層と言う）と、有機ＥＬ層
をその両面から挟持する一対の電極とを有し、電極から
画像信号として電圧や電流を有機ＥＬ層に加えることに
より有機ＥＬ層内で高輝度発光を行わせる発光素子であ
って、１０Ｖ以下の作動電圧で１００００ｃｄ／ｍ2 以
上の高輝度発光も可能であると言われている。2. Description of the Related Art As one of means for reducing the thickness of an image display device such as a display, an organic electroluminescence element (hereinafter simply referred to as an organic EL element) has attracted attention. The organic EL element has an organic electroluminescence layer (hereinafter, simply referred to as an organic EL layer) and a pair of electrodes sandwiching the organic EL layer from both sides thereof. It is a light-emitting element that emits high-luminance light in the organic EL layer when added to the layer, and is said to be capable of emitting high-luminance light of 10,000 cd / m 2 or more at an operating voltage of 10 V or less.
【０００３】ここで、図３を参照して、従来の有機ＥＬ
素子の構造を説明する。図３は、従来の有機ＥＬ素子の
部分断面側面図である。従来の有機ＥＬ素子１０は、図
３に示すように、透明なガラス基板１２上に、インジウ
ム錫酸化物（以下、ＩＴＯと略記する）等の透明電極１
４、正孔輸送層１６、有機ＥＬ層１８及び陰極電極２０
を、順次、積層した積層構造を備えている。また、積層
構造を外気から遮断するために、積層構造を包囲する気
密ケース２２がガラス基板１２上に密着固定されてい
る。有機ＥＬ素子では、透明電極１４と陰極電極２０と
からなる一対の電極からそれぞれ注入された正孔と電子
とが有機ＥＬ層１８内で再結合して発光し、発光した光
が透明電極１４及びガラス基板１２を透過して外部に放
出される。[0003] Here, referring to FIG.
The structure of the element will be described. FIG. 3 is a partial sectional side view of a conventional organic EL element. As shown in FIG. 3, a conventional organic EL element 10 has a transparent electrode 1 such as indium tin oxide (hereinafter abbreviated as ITO) on a transparent glass substrate 12.
4. Hole transport layer 16, organic EL layer 18, and cathode electrode 20
Are sequentially laminated. Further, an airtight case 22 surrounding the laminated structure is tightly fixed on the glass substrate 12 to shield the laminated structure from the outside air. In the organic EL element, holes and electrons injected from a pair of electrodes including the transparent electrode 14 and the cathode electrode 20 are recombined in the organic EL layer 18 to emit light, and the emitted light is emitted from the transparent electrode 14 and the The light is transmitted to the outside through the glass substrate 12.
【０００４】ところで、有機ＥＬ素子は、低電圧で高輝
度発光させることのできる、発光効率の高い発光素子で
あると評価されているものの、外部から侵入する湿気や
熱等により特性の劣化が進み、寿命が短いという問題が
あった。特性の劣化は、アモルファス形態の有機ＥＬ層
が湿気により結晶化することに因ると考えられている。
そこで、従来の有機ＥＬ素子では、ガラス基板１２と気
密ケース２２とにより区画される空間２４に不活性ガス
を封入し、外部からの湿気や熱等の侵入を防止してい
る。[0004] Incidentally, although the organic EL element is evaluated as a light emitting element having high luminous efficiency and capable of emitting high-luminance light at a low voltage, its characteristics are degraded due to moisture and heat entering from the outside. However, there is a problem that the life is short. It is considered that the deterioration of the characteristics is due to the crystallization of the amorphous organic EL layer by moisture.
Therefore, in the conventional organic EL element, an inert gas is sealed in a space 24 defined by the glass substrate 12 and the airtight case 22 to prevent moisture and heat from entering from the outside.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来の有機Ｅ
Ｌ素子では、短時間の使用であっても、発光面にダーク
スポットが発生、成長し、そのために、発光面全面にわ
たり鮮明な画像を表示することが難しく、有機ＥＬ素子
の実用化上で問題となっていた。そこで、本発明の目的
は、長期間にわたり鮮明な画像を表示できる有機ＥＬ素
子を提供することである。However, the conventional organic E
In the L element, even when used for a short time, a dark spot is generated and grows on the light emitting surface, which makes it difficult to display a clear image over the entire light emitting surface, which is a problem in practical use of the organic EL element. Had become. Therefore, an object of the present invention is to provide an organic EL device that can display a clear image for a long period of time.
【０００６】[0006]
【課題を解決するための手段】本発明者は、発光面にダ
ークスポットが発生する原因は、有機ＥＬ素子の発光機
構が外部から侵入した湿気により局部的に又は全体的に
劣化することにあると考え、更に、外部から湿気の侵入
を完全に防止する対策を講ずるよりは寧ろ侵入した湿気
を捕捉して発光機構に影響を与えないようにすることが
実際的であると考え、本発明を完成するに到った。According to the present inventors, the cause of the occurrence of a dark spot on the light emitting surface is that the light emitting mechanism of the organic EL element is locally or entirely deteriorated by moisture invading from the outside. Further, rather than taking measures to completely prevent the invasion of moisture from the outside, it is more practical to capture the infiltrated moisture so as not to affect the light-emitting mechanism. It was completed.
【０００７】上記目的を達成するために、上述の知見に
基づいて、本発明に係る有機ＥＬ素子（以下、第１の発
明と言う）は、基板と、基板上に、順次、形成された透
明電極、有機エレクトロルミネッセンス層及び透明電極
の対向電極を少なくとも有する積層構造と、積層構造を
外気から遮断するように基板上に設けられた蓋体とを備
え、基板と蓋体とにより区画された空間に不活性ガスを
封入してなる有機エレクトロルミネッセンス素子（以
下、有機ＥＬ素子と言う）において、蓋体が、基板に対
向して積層構造の上方に設けられた板状体と、積層構造
から離隔した配置で基板から板状体まで筒状に延在して
積層構造を囲む周囲壁とにより構成され、周囲壁は、そ
れぞれ、接着剤により形成されて基板と板状体とを連結
する、内壁及び内壁から離隔して内壁の外側に配置され
た外壁と、内壁と外壁との間に装入された吸着剤層とに
より形成されていることを特徴としている。In order to achieve the above object, based on the above findings, an organic EL device according to the present invention (hereinafter referred to as a first invention) comprises a substrate and a transparent layer formed sequentially on the substrate. A laminated structure having at least an electrode, an organic electroluminescent layer and a counter electrode of a transparent electrode, and a lid provided on the substrate so as to shield the laminated structure from the outside air, and a space defined by the substrate and the lid In an organic electroluminescence element (hereinafter, referred to as an organic EL element) in which an inert gas is filled in, a lid is provided so as to be spaced apart from the plate-like body provided above the laminate structure facing the substrate. Peripheral wall extending in a cylindrical shape from the substrate to the plate-shaped body in an arranged arrangement and surrounding the laminated structure, and the peripheral wall is formed of an adhesive, and connects the substrate and the plate-shaped body, respectively. And inner wall An outer wall disposed outside the inner wall and al apart, is characterized in that it is formed by the adsorbent layer charged between the inner and outer walls.
【０００８】第１の発明及び次の第２の発明の積層構造
は、基板上に、順次、形成された透明電極、有機エレク
トロルミネッセンス層及び透明電極の対向電極を少なく
とも有するものである限り制約はなく、例えば透明電極
と有機エレクトロルミネッセンス層との間に正孔輸送層
を備えていても良い。基板の材質は、特に制限はなく、
従来から有機ＥＬ素子の基板として使用されているも
の、例えばガラス板、透明プラスチック板、石英板等を
用いることができる。また、基板と蓋体とにより区画さ
れた空間は、真空空間であっても、不活性ガスが封入さ
れた空間であっても良い。板状体は、蓋体の天井壁とし
て使用できる板状の部材である限り、材質に制約はな
く、例えばガラス板、プラスチック板、石英板でも良
く、また、金属板、セラミック板でも良い。周囲壁は、
基板と上方の板状体とを一体的かつ機械的に連結できる
強度を有する限り、周囲壁を形成する接着剤の種類、組
成には制約はない。好適には、接着剤として、例えば昭
和高分子工業（株）から商品名アラルダイト ＡＷ１０
６（登録商標）として販売されている接着剤を使用す
る。また、周囲壁が、周囲壁が、内壁と外壁との間に、
更に、内壁と外壁の双方から離隔した配置で設けられた
中間壁、又は内壁と外壁から離隔し、かつ相互に離隔し
た配置で設けられた多重の中間壁を有し、壁間には吸着
剤層を有するようにして良い。吸着剤層として装入する
吸着剤は、外壁から侵入した水分を吸着、捕捉すること
ができる限り、その種類、材料、形状には制約はない。
例えば、シリカゲル、ゼオライト、アルミナ等の金属酸
化物、デンプン／アクリロニトリルグラフト重合体の過
水化物等の高分子吸水剤でも良い。また、吸着剤は、内
壁と外壁との間の空間を充満するように充填されていて
も良く、また空間の一部のみに充填されていても良い。[0008] The laminated structure of the first invention and the following second invention is not limited as long as it has at least a transparent electrode, an organic electroluminescent layer, and a transparent electrode counter electrode sequentially formed on a substrate. Alternatively, for example, a hole transport layer may be provided between the transparent electrode and the organic electroluminescence layer. The material of the substrate is not particularly limited,
A substrate conventionally used as a substrate for an organic EL element, for example, a glass plate, a transparent plastic plate, a quartz plate, or the like can be used. The space defined by the substrate and the lid may be a vacuum space or a space filled with an inert gas. The plate-shaped body is not limited in material as long as it is a plate-shaped member that can be used as a ceiling wall of the lid, and may be, for example, a glass plate, a plastic plate, a quartz plate, a metal plate, or a ceramic plate. The surrounding wall is
There is no restriction on the type and composition of the adhesive forming the peripheral wall, as long as the adhesive has a strength capable of integrally and mechanically connecting the substrate and the upper plate. Preferably, the adhesive is, for example, Araldite AW10 from Showa Kogaku Kogyo KK
6 (registered trademark) is used. Also, the surrounding wall, the surrounding wall, between the inner wall and the outer wall,
Furthermore, it has an intermediate wall provided in an arrangement separated from both the inner wall and the outer wall, or a plurality of intermediate walls provided in an arrangement separated from the inner wall and the outer wall and separated from each other, and an adsorbent is provided between the walls. It may have a layer. The type, material, and shape of the adsorbent to be charged as the adsorbent layer are not limited as long as the adsorbent can adsorb and capture moisture that has entered from the outer wall.
For example, metal oxides such as silica gel, zeolite and alumina, and polymer water absorbing agents such as perhydrate of starch / acrylonitrile graft polymer may be used. Further, the adsorbent may be filled so as to fill the space between the inner wall and the outer wall, or may be filled only in a part of the space.
【０００９】本発明に係る有機ＥＬ素子（以下、第２の
発明と言う）は、基板と、基板上に、順次、形成された
透明電極、有機エレクトロルミネッセンス層及び透明電
極の対向電極を少なくとも有する積層構造と、積層構造
を外気から遮断するように基板上に設けられた蓋体とを
備え、基板と蓋体とにより区画された空間に不活性ガス
を封入してなる有機エレクトロルミネッセンス素子（以
下、有機ＥＬ素子と言う）において、蓋体の内面の少な
くとも一部に吸着膜が設けてあることを特徴としてい
る。本発明の好適な実施態様では、蓋体が、基板に対向
して積層構造の上方に設けられた板状体と、積層構造か
ら離隔した配置で基板から板状体まで筒状に延在して積
層構造を囲む周囲壁とにより構成され、吸着膜が板状体
に設けられている。吸着膜は、板状体の内面のほぼ全面
に設けても良く、また内面の一部にのみ設けても良く、
周囲壁に接触していても、更には周囲壁の外側まではみ
出していても差し支えない。An organic EL device according to the present invention (hereinafter, referred to as a second invention) has at least a substrate and, on the substrate, at least a transparent electrode, an organic electroluminescent layer, and a counter electrode of the transparent electrode which are sequentially formed. An organic electroluminescence device (hereinafter referred to as an organic EL device) comprising a laminated structure, and a lid provided on the substrate so as to shield the laminated structure from the outside air, wherein an inert gas is sealed in a space defined by the substrate and the lid. , An organic EL element) is characterized in that an adsorption film is provided on at least a part of the inner surface of the lid. In a preferred embodiment of the present invention, the lid body has a plate-like body provided above the laminated structure facing the substrate, and extends in a cylindrical shape from the substrate to the plate-like body in an arrangement separated from the laminated structure. And the surrounding wall surrounding the laminated structure, and the adsorption film is provided on the plate-like body. The adsorption film may be provided on almost the entire inner surface of the plate-like body, or may be provided only on a part of the inner surface,
It may be in contact with the peripheral wall or even protrude outside the peripheral wall.
【００１０】吸着膜は、蓋体と基板とにより区画される
空間に侵入した水分を吸着、捕捉することができる限
り、その種類、材料、形状には制約はない。例えば、吸
着膜は、シリカゲル、ゼオライト、アルミナ等の金属酸
化物、デンプン／アクリロニトリルグラフト重合体の過
水化物等の高分子吸水剤を吸着剤として使った膜状の吸
着体である。吸着膜の平面形状、面積及び膜厚は、制約
はなく、水分吸着量を設定することにより決定できる。The type, material and shape of the adsorbing film are not limited as long as the adsorbing film can adsorb and capture moisture that has entered the space defined by the lid and the substrate. For example, the adsorption film is a film-shaped adsorbent using a polymer water absorbent such as a metal oxide such as silica gel, zeolite and alumina, and a perhydrate of starch / acrylonitrile graft polymer as an adsorbent. The planar shape, area, and thickness of the adsorption film are not limited, and can be determined by setting the amount of adsorbed moisture.
【００１１】[0011]
【発明の実施の形態】以下に、添付図面を参照し、実施
形態例を挙げて本発明の実施の形態を具体的かつ詳細に
説明する。実施形態例１ 本実施形態例は、第１の発明の有機ＥＬ素子の実施の形
態を示す例であって、図１（ａ）は本実施形態例の有機
ＥＬ素子の部分断面側面図、図１（ｂ）は図１（ａ）の
矢視Ｉ−Ｉでの平面図である。本実施形態例の有機ＥＬ
素子３０は、図１（ａ）に示すように、ガラス基板３２
と、ガラス基板３２上に、順次、形成された、ＩＴＯ等
の透明電極（陽極）３４、有機エレクトロルミネッセン
ス層（以下、有機ＥＬ層と言う）３６、及び電極３４の
対向電極としての陰極３８とからなる積層構造４０と、
ガラス基板３２上の積層構造４０を外気から遮断する蓋
体４２とを備えている。尚、陽極３４及び陰極３８への
リード線、及びその他の付属品は、簡単のために、省略
している。また、ガラス基板３２と蓋体４２とにより区
画された空間４４には、不活性ガス、例えば窒素ガスが
封入されている。Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 This embodiment is an example showing an embodiment of the organic EL device of the first invention, and FIG. 1A is a partial cross-sectional side view of the organic EL device of this embodiment, and FIG. FIG. 1B is a plan view taken along the line II in FIG. 1A. Organic EL of this embodiment
The element 30 includes a glass substrate 32 as shown in FIG.
And a transparent electrode (anode) 34 of ITO or the like, an organic electroluminescence layer (hereinafter referred to as an organic EL layer) 36, and a cathode 38 as a counter electrode of the electrode 34, which are sequentially formed on the glass substrate 32. A laminated structure 40 comprising
A lid 42 for shielding the laminated structure 40 on the glass substrate 32 from the outside air. Note that the lead wires to the anode 34 and the cathode 38 and other accessories are omitted for simplicity. In addition, an inert gas, for example, a nitrogen gas is sealed in a space 44 defined by the glass substrate 32 and the lid 42.
【００１２】蓋体４２は、ガラス基板３２に対向して積
層構造４０の上方に設けられた、厚さ０．７mm程度のガ
ラス板４６と、積層構造４０から離隔した配置でガラス
基板３２からガラス板４６まで筒状に延在して積層構造
４０を囲む周囲壁４８とにより構成されている。周囲壁
４８は、図１に示すように、積層構造４０に近い位置に
設けられた内壁５０と、内壁５０から０．１〜１．０mm
離隔して内壁５０の外側に配置された外壁５２と、内壁
５０と外壁５２との間に装入された吸着剤層５４とによ
り形成されている。内壁５０及び外壁５２は、それぞ
れ、０．１〜１０mmの壁厚を有する接着剤層として形成
されていて、これにより、ガラス基板３２とガラス板４
６とを一体的に強固に連結している。内壁５０及び外壁
５２を形成する接着剤には、例えば昭和高分子工業
（株）から商品名アラルダイト ＡＷ１０６（登録商
標）として販売されている接着剤を使用する。また、周
囲壁４８の高さ、即ちガラス基板３２とガラス板４６と
の間隔は、積層構造４０の高さ（通常、０．１μm 程
度）より高い、例えば０．２〜１．０μm である。吸着
剤層５４は、内壁５０と外壁５２との間の全空間をシリ
カゲル等の吸着剤で充満状態に充填したものであって良
く、また空間の一部に吸着剤を充填したものであっても
良い。A lid 42 is provided above the laminated structure 40 so as to face the glass substrate 32 and has a thickness of about 0.7 mm. A peripheral wall 48 which extends in a cylindrical shape to the plate 46 and surrounds the laminated structure 40 is formed. As shown in FIG. 1, the peripheral wall 48 has an inner wall 50 provided at a position near the laminated structure 40 and a distance of 0.1 to 1.0 mm from the inner wall 50.
It is formed by an outer wall 52 arranged outside the inner wall 50 at a distance, and an adsorbent layer 54 inserted between the inner wall 50 and the outer wall 52. The inner wall 50 and the outer wall 52 are each formed as an adhesive layer having a wall thickness of 0.1 to 10 mm.
6 is integrally and firmly connected. As the adhesive forming the inner wall 50 and the outer wall 52, for example, an adhesive sold by Showa Kogaku Kogyo KK under the trade name Araldite AW106 (registered trademark) is used. The height of the peripheral wall 48, that is, the distance between the glass substrate 32 and the glass plate 46 is higher than the height of the laminated structure 40 (generally, about 0.1 μm), for example, 0.2 to 1.0 μm. The adsorbent layer 54 may be one in which the entire space between the inner wall 50 and the outer wall 52 is filled with an adsorbent such as silica gel, or a part of the space is filled with the adsorbent. Is also good.
【００１３】以下に、図１を参照して、本実施形態例の
有機ＥＬ素子３０の形成方法を説明する。先ず、従来の
方法と同様にしてガラス基板３２上に積層構造４０を形
成し、続いて必要な配線を形成する。次いで、印刷法に
より、又はディスペンサ等による直接塗布法により内壁
５０及び外壁５２を形成する接着剤層５０、５２を、図
１（ｂ）に示すように、ガラス板４６上に成膜する。続
いて、吸着剤を溶媒に溶解又は懸濁させた溶液又は懸濁
液の塗膜を塗布法又は印刷法により接着剤層５０、５２
の間に成膜し、溶媒を蒸発させて吸着剤層５４を形成す
る。吸着剤を溶解又は懸濁した溶液又は懸濁液には、結
着剤を添加して、吸着剤がガラス板４６上に付着し易い
ようにしても良い。また、金属酸化物を吸着剤として使
用するときには、別法として抵抗加熱法、スパッタ法等
を使った蒸着プロセスにより金属酸化物をガラス板４６
上の接着剤層５０、５２の間に蒸着させて吸着剤層５４
を形成することもできる。次いで、空間４４に封入する
不活性ガス雰囲気内で、ガラス板４６をガラス基板３２
に重ねて接着剤層５０、５２により相互に接着すること
により、本実施形態例の有機ＥＬ素子３０を得ることが
できる。なお、本実施形態例では、ガラス板４６上に接
着剤層５０、５２及び吸着剤層５４を形成しているが、
これに代えてガラス基板３２上にこれら接着剤層５０、
５２及び吸着剤層５４を形成しても良い。Hereinafter, a method for forming the organic EL element 30 according to this embodiment will be described with reference to FIG. First, the laminated structure 40 is formed on the glass substrate 32 in the same manner as in the conventional method, and then necessary wirings are formed. Next, adhesive layers 50 and 52 forming the inner wall 50 and the outer wall 52 are formed on the glass plate 46 by a printing method or a direct application method using a dispenser or the like, as shown in FIG. 1B. Subsequently, a coating film of a solution or suspension in which the adsorbent is dissolved or suspended in a solvent is applied to the adhesive layers 50, 52 by a coating method or a printing method.
The adsorbent layer 54 is formed by evaporating the solvent. A binder may be added to the solution or suspension in which the adsorbent has been dissolved or suspended, so that the adsorbent can easily adhere to the glass plate 46. When a metal oxide is used as the adsorbent, the metal oxide is deposited on the glass plate 46 by a vapor deposition process using a resistance heating method, a sputtering method, or the like.
The adsorbent layer 54 is deposited between the adhesive layers 50 and 52 on the upper side.
Can also be formed. Next, the glass plate 46 is placed on the glass substrate 32 in an inert gas atmosphere sealed in the space 44.
The organic EL element 30 according to the present embodiment can be obtained by superimposing and bonding them to each other with the adhesive layers 50 and 52. In this embodiment, the adhesive layers 50 and 52 and the adsorbent layer 54 are formed on the glass plate 46.
Instead, these adhesive layers 50 on the glass substrate 32,
52 and the adsorbent layer 54 may be formed.
【００１４】有機ＥＬ素子３０の長期間の動作信頼性を
評価するために、有機ＥＬ素子３０を試作して動作させ
たところ、動作期間が３か月を経過して時点でも、発光
強度の半減期には到達しなかった。一方、従来の有機Ｅ
Ｌ素子の発光強度の半減期は３日であった。これによ
り、本実施形態例の有機ＥＬ素子は、従来の有機ＥＬ素
子に比べて遙に長い期間にわたり高い信頼性で動作する
ことが確認できた。In order to evaluate the long-term operation reliability of the organic EL element 30, the organic EL element 30 was trial-produced and operated. Even when the operation period was over three months, the emission intensity was reduced by half. Period was not reached. On the other hand, conventional organic E
The half-life of the light emission intensity of the L element was 3 days. As a result, it was confirmed that the organic EL device of this embodiment operates with higher reliability over a much longer period than the conventional organic EL device.
【００１５】実施形態例２ 本実施形態例は、第２の発明の有機ＥＬ素子の実施の形
態を示す例であって、図２（ａ）は本実施形態例の有機
ＥＬ素子の部分断面側面図、図２（ｂ）は図２（ａ）の
矢視II−IIでの平面図である。図１に示すものと同じも
のには同じ符号を付して説明を省略している。本実施形
態例の有機ＥＬ素子６０は、図２（ａ）に示すように、
ガラス基板３２と、ガラス基板３２上に、順次、形成さ
れた、陽極３４、有機ＥＬ層３６、及び陰極３８からな
る積層構造４０と、ガラス基板３２上の積層構造４０を
外気から遮断する蓋体４２とを備えている。ガラス基板
３２と蓋体４２により区画された空間４４には、不活性
ガスが封入されている。尚、陽極３４及び陰極３８への
リード線及びその他の付属品は、簡単のために、省略し
ている。 Embodiment 2 This embodiment is an example showing an embodiment of the organic EL device of the second invention. FIG. 2A is a partial cross-sectional side view of the organic EL device of this embodiment. FIG. 2B is a plan view taken along the line II-II in FIG. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 2A, the organic EL element 60 of this embodiment is
A glass substrate 32, a laminated structure 40 sequentially formed on the glass substrate 32, including an anode 34, an organic EL layer 36, and a cathode 38, and a lid for shielding the laminated structure 40 on the glass substrate 32 from the outside air 42. An inert gas is sealed in a space 44 defined by the glass substrate 32 and the lid 42. Note that lead wires to the anode 34 and the cathode 38 and other accessories are omitted for simplicity.
【００１６】蓋体４２は、ガラス基板３２に対向して積
層構造４０の上方に設けられた、厚さ０．７mm程度のガ
ラス板４６と、積層構造４０から離隔した配置でガラス
基板３２からガラス板４６まで筒状に延在して積層構造
４０を囲む周囲壁６２とにより構成されている。周囲壁
６２は、０．１〜１０mmの壁厚を有する接着剤層として
形成されていて、これにより、ガラス基板３２とガラス
板４６とを一体的に強固に連結している。周囲壁６２の
高さ、即ちガラス基板３２とガラス板４６との間隔は、
積層構造４０の高さ（通常、０．１μm 程度）より高
い、例えば０．２〜１．０μm である。ガラス板４６に
は、図２（ａ）及び（ｂ）に示すように、シリカゲル等
の金属酸化物からなる厚さ０．１μm の四角形の吸着膜
６４が周囲壁６２の内側に設けてある。周囲壁６２の周
囲長さを４４cmとするとき、四角形の吸着膜６４の面積
は、１００cm2 程度である。The lid 42 is provided above the laminated structure 40 so as to face the glass substrate 32 and has a glass plate 46 having a thickness of about 0.7 mm. A peripheral wall 62 extending in a cylindrical shape to the plate 46 and surrounding the laminated structure 40 is formed. The peripheral wall 62 is formed as an adhesive layer having a wall thickness of 0.1 to 10 mm, thereby firmly connecting the glass substrate 32 and the glass plate 46 integrally. The height of the peripheral wall 62, that is, the distance between the glass substrate 32 and the glass plate 46,
The height is higher than the height of the laminated structure 40 (generally, about 0.1 μm), for example, 0.2 to 1.0 μm. As shown in FIGS. 2A and 2B, the glass plate 46 is provided with a 0.1 μm-thick square adsorption film 64 made of a metal oxide such as silica gel inside the peripheral wall 62. When the peripheral length of the peripheral wall 62 is 44 cm, the area of the rectangular adsorption film 64 is about 100 cm 2 .
【００１７】以下に、図２を参照して、本実施形態例の
有機ＥＬ素子６０の形成方法を説明する。先ず、従来の
方法と同様にしてガラス基板３２上に積層構造４０を形
成し、続いて必要な配線を形成する。次いで、印刷法に
より、又はディスペンサ等による直接塗布法により周囲
壁６２を形成する接着剤層６２を、図２（ｂ）に示すよ
うに、ガラス板４６上に成膜する。続いて、吸着剤を溶
媒に溶解又は懸濁させた溶液又は懸濁液の塗膜を塗布法
又は印刷法により、図２（ｂ）に示すように、ガラス板
４６上に成膜し、溶媒を蒸発させて吸着膜６４を形成す
る。吸着剤を溶解又は懸濁した溶液又は懸濁液には、結
着剤を添加して、吸着剤がガラス板４６上に付着し易い
ようにしても良い。また、金属酸化物を吸着剤として使
用するときには、別法として、蒸着プロセスにより金属
酸化物をガラス板４６上に蒸着させて吸着膜６４を形成
することもできる。次いで、空間４４に封入する不活性
ガス雰囲気内で、ガラス板４６をガラス基板３２に重ね
て接着剤層６２により相互に接着することにより、本実
施形態例の有機ＥＬ素子６０を得ることができる。Hereinafter, a method for forming the organic EL element 60 according to this embodiment will be described with reference to FIG. First, the laminated structure 40 is formed on the glass substrate 32 in the same manner as in the conventional method, and then necessary wirings are formed. Next, an adhesive layer 62 that forms the peripheral wall 62 by a printing method or a direct application method using a dispenser or the like is formed on the glass plate 46 as shown in FIG. 2B. Subsequently, a coating film of a solution or suspension in which the adsorbent is dissolved or suspended in a solvent is formed on a glass plate 46 by a coating method or a printing method as shown in FIG. Is evaporated to form an adsorption film 64. A binder may be added to the solution or suspension in which the adsorbent has been dissolved or suspended, so that the adsorbent can easily adhere to the glass plate 46. When a metal oxide is used as the adsorbent, as another method, the metal oxide may be deposited on the glass plate 46 by an evaporation process to form the adsorption film 64. Next, the organic EL element 60 of the present embodiment can be obtained by stacking the glass plate 46 on the glass substrate 32 and bonding them together with the adhesive layer 62 in an inert gas atmosphere sealed in the space 44. .
【００１８】有機ＥＬ素子６０の長期間の動作信頼性を
評価するために、有機ＥＬ素子６０を試作して動作させ
たところ、実施形態例１の有機ＥＬ素子３０と同様に、
動作期間が３か月を経過して時点でも、発光強度の半減
期には到達しなかった。これにより、本実施形態例の有
機ＥＬ素子は、従来の有機ＥＬ素子に比べて遙に長い期
間にわたり高い信頼性で動作することが確認できた。In order to evaluate the long-term operation reliability of the organic EL element 60, the organic EL element 60 was prototyped and operated. As in the case of the organic EL element 30 of Embodiment 1,
Even after the operation period of three months, the half-life of the light emission intensity did not reach. As a result, it was confirmed that the organic EL device of this embodiment operates with higher reliability over a much longer period than the conventional organic EL device.
【００１９】[0019]
【発明の効果】第１の発明の構成によれば、基板上の積
層構造からなる発光機構を外気から遮断する蓋体の周囲
壁を内壁及び外壁の２重壁構造とし、壁間に吸着剤層を
設けて、外壁から侵入した水分を吸着剤層により吸着、
捕捉することにより、内壁内の発光機構に対する外部の
湿気の影響を遮断し、発光機構の劣化を防止している。
第２の発明の構成によれば、基板上の積層構造からなる
発光機構を外気から遮断する蓋体の内側に吸着膜を設け
て、蓋体と基板とにより区画する空間内に外部から侵入
した水分を吸着膜により吸着、捕捉することにより、空
間内の発光機構に対する外部の湿気の影響を抑制し、発
光機構の劣化を防止している。これにより、第１及び第
２の発明は、長期間にわたり鮮明な画像を表示できる有
機ＥＬ素子を実現している。According to the structure of the first aspect of the present invention, the peripheral wall of the lid for shielding the light emitting mechanism having the laminated structure on the substrate from the outside air has a double wall structure of an inner wall and an outer wall, and an adsorbent is provided between the walls. A layer is provided to adsorb moisture invading from the outer wall with the adsorbent layer,
By capturing, the influence of external moisture on the light emitting mechanism in the inner wall is blocked, and deterioration of the light emitting mechanism is prevented.
According to the configuration of the second invention, the suction film is provided inside the lid that blocks the light emitting mechanism having the laminated structure on the substrate from the outside air, and the light-emitting mechanism enters from the outside into the space defined by the lid and the substrate. By adsorbing and capturing the moisture with the adsorption film, the influence of external moisture on the light emitting mechanism in the space is suppressed, and the deterioration of the light emitting mechanism is prevented. Thereby, the first and second inventions realize an organic EL element capable of displaying a clear image for a long period of time.
【図１】図１（ａ）は実施形態例１の有機ＥＬ素子の部
分断面側面図、図１（ｂ）は図１（ａ）の矢視Ｉ−Ｉで
の平面図である。FIG. 1A is a partial cross-sectional side view of an organic EL device according to a first embodiment, and FIG. 1B is a plan view taken along a line II in FIG. 1A.
【図２】図２（ａ）は実施形態例２の有機ＥＬ素子の部
分断面側面図、図２（ｂ）は図２（ａ）の矢視II−IIで
の平面図である。FIG. 2A is a partial cross-sectional side view of an organic EL device according to a second embodiment, and FIG. 2B is a plan view taken along a line II-II in FIG. 2A.
【図３】従来の有機ＥＬ素子の部分断面側面図である。FIG. 3 is a partial sectional side view of a conventional organic EL element.
１０ 従来の有機ＥＬ素子 １２ ガラス基板 １４ 透明電極 １６ 正孔輸送層 １８ 有機ＥＬ層 ２０ 陰極電極 ２２ 気密ケース ２４ ガラス基板と気密ケースとにより区画される空間 ３０ 実施形態例１の有機ＥＬ素子 ３２ ガラス基板 ３４ 透明電極 ３６ 有機ＥＬ層 ３８ 陰極 ４０ 積層構造 ４２ 蓋体 ４４ ガラス基板と蓋体とにより区画された空間 ４６ ガラス板 ４８ 周囲壁 ５０ 内壁 ５２ 外壁 ５４ 吸着剤層 ６０ 実施形態例２の有機ＥＬ素子 ６２ 周囲壁 ６４ 吸着膜 DESCRIPTION OF SYMBOLS 10 Conventional organic EL element 12 Glass substrate 14 Transparent electrode 16 Hole transport layer 18 Organic EL layer 20 Cathode electrode 22 Hermetic case 24 Space divided by glass substrate and hermetic case 30 Organic EL element of Embodiment 1 32 Glass Substrate 34 Transparent electrode 36 Organic EL layer 38 Cathode 40 Laminated structure 42 Lid 44 Space defined by glass substrate and lid 46 Glass plate 48 Peripheral wall 50 Inner wall 52 Outer wall 54 Adsorbent layer 60 Organic EL of Embodiment 2 Element 62 Perimeter wall 64 Adsorption film
Claims (4)
明電極、有機エレクトロルミネッセンス層及び透明電極
の対向電極を少なくとも有する積層構造と、積層構造を
外気から遮断するように基板上に設けられた蓋体とを備
え、基板と蓋体とにより区画された空間に不活性ガスを
封入してなる有機エレクトロルミネッセンス素子（以
下、有機ＥＬ素子と言う）において、 蓋体が、基板に対向して積層構造の上方に設けられた板
状体と、積層構造から離隔した配置で基板から板状体ま
で筒状に延在して積層構造を囲む周囲壁とにより構成さ
れ、 周囲壁は、それぞれ、接着剤により形成されて基板と板
状体とを連結する、内壁及び内壁から離隔して内壁の外
側に配置された外壁と、内壁と外壁との間に装入された
吸着剤層とにより形成されていることを特徴とする有機
ＥＬ素子。1. A substrate, a laminated structure having at least a transparent electrode, an organic electroluminescent layer, and a transparent electrode opposed electrode formed sequentially on the substrate, and a laminated structure provided on the substrate so as to shield the laminated structure from the outside air. In an organic electroluminescence device (hereinafter referred to as an organic EL device) in which an inert gas is sealed in a space defined by the substrate and the lid, the lid faces the substrate. And a peripheral wall surrounding the laminated structure extending cylindrically from the substrate to the planar body at a distance from the laminated structure and surrounding the laminated structure. An inner wall and an outer wall spaced apart from the inner wall and arranged outside the inner wall, and an adsorbent layer inserted between the inner wall and the outer wall, connecting the substrate and the plate-shaped body by an adhesive. Is formed The organic EL element characterized and.
内壁と外壁の双方から離隔した配置で設けられた中間
壁、又は内壁と外壁から離隔し、かつ相互に離隔した配
置で設けられた多重の中間壁を有し、壁間には吸着剤層
を有することを特徴とする請求項１に記載の有機ＥＬ素
子。2. The method according to claim 1, wherein the surrounding wall is between the inner wall and the outer wall.
An intermediate wall provided in an arrangement separated from both the inner wall and the outer wall, or a plurality of intermediate walls provided in an arrangement separated from the inner wall and the outer wall and separated from each other, and an adsorbent layer is provided between the walls. The organic EL device according to claim 1, comprising:
明電極、有機エレクトロルミネッセンス層及び透明電極
の対向電極を少なくとも有する積層構造と、積層構造を
外気から遮断するように基板上に設けられた蓋体とを備
え、基板と蓋体とにより区画された空間に不活性ガスを
封入してなる有機エレクトロルミネッセンス素子（以
下、有機ＥＬ素子と言う）において、 蓋体の内面の少なくとも一部に吸着膜が設けてあること
を特徴とする有機ＥＬ素子。3. A substrate, a laminated structure having at least a transparent electrode, an organic electroluminescent layer and a transparent electrode facing each other formed sequentially on the substrate, and a laminated structure provided on the substrate so as to shield the laminated structure from the outside air. An organic electroluminescence device (hereinafter, referred to as an organic EL device) having an inactive gas sealed in a space defined by a substrate and a lid, comprising at least a part of an inner surface of the lid. An organic EL device, wherein an adsorption film is provided on the organic EL device.
に設けられた板状体と、積層構造から離隔した配置で基
板から板状体まで筒状に延在して積層構造を囲む周囲壁
とにより構成され、 吸着膜が板状体に設けられていることを特徴とする請求
項３に記載の有機ＥＬ素子。4. A laminated structure in which a lid body is provided above the laminated structure facing the substrate and a lid extends cylindrically from the substrate to the planar body at a distance from the laminated structure. The organic EL device according to claim 3, wherein the organic EL device is constituted by a surrounding wall, and the adsorption film is provided on the plate-like body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28500497A JP3975374B2 (en) | 1997-10-17 | 1997-10-17 | Organic EL device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28500497A JP3975374B2 (en) | 1997-10-17 | 1997-10-17 | Organic EL device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11121165A true JPH11121165A (en) | 1999-04-30 |
| JP3975374B2 JP3975374B2 (en) | 2007-09-12 |
Family
ID=17685910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28500497A Expired - Fee Related JP3975374B2 (en) | 1997-10-17 | 1997-10-17 | Organic EL device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3975374B2 (en) |
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| JP2002352952A (en) * | 2001-05-24 | 2002-12-06 | Tohoku Pioneer Corp | Organic el display panel and manufacturing method therefor |
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