JP2002184583A - Organic luminescent element - Google Patents
Organic luminescent elementInfo
- Publication number
- JP2002184583A JP2002184583A JP2000382187A JP2000382187A JP2002184583A JP 2002184583 A JP2002184583 A JP 2002184583A JP 2000382187 A JP2000382187 A JP 2000382187A JP 2000382187 A JP2000382187 A JP 2000382187A JP 2002184583 A JP2002184583 A JP 2002184583A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- organic
- light emitting
- ligand
- cathode
- 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
- 239000010410 layer Substances 0.000 claims abstract description 114
- 239000003446 ligand Substances 0.000 claims abstract description 49
- 239000012044 organic layer Substances 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000010406 cathode material Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000011368 organic material Substances 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 abstract description 13
- 108091006149 Electron carriers Proteins 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000005525 hole transport Effects 0.000 description 23
- 239000000463 material Substances 0.000 description 14
- 239000010408 film Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 239000010409 thin film Substances 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 238000004528 spin coating Methods 0.000 description 4
- -1 tetraphenylborate derivative Chemical class 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920000109 alkoxy-substituted poly(p-phenylene vinylene) Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 150000003983 crown ethers Chemical class 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 125000000040 m-tolyl group Chemical group [H]C1=C([H])C(*)=C([H])C(=C1[H])C([H])([H])[H] 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000553 poly(phenylenevinylene) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、有機薄膜のエレ
クトロルミネッセンス現象を利用した有機発光素子に関
する。[0001] 1. Field of the Invention [0002] The present invention relates to an organic light emitting device utilizing the electroluminescence phenomenon of an organic thin film.
【０００２】[0002]
【従来の技術】図９は有機発光素子の簡略構成図であ
る。図示するように、この有機発光素子は、陽極１２を
膜形成した透明なガラス基板１１の上に、正孔輸送層１
３、発光層１４、電子輸送層１５を順次膜形成し、さら
に、電子輸送層１５に陰極１６を膜形成した構造となっ
ている。なお、ガラス基板１１は、透明なプラスチック
材で形成されたものがある。2. Description of the Related Art FIG. 9 is a simplified structural view of an organic light emitting device. As shown in the figure, the organic light-emitting device has a hole transport layer 1 on a transparent glass substrate 11 on which an anode 12 is formed.
3, a light-emitting layer 14 and an electron transport layer 15 are sequentially formed, and a cathode 16 is formed on the electron transport layer 15. The glass substrate 11 may be formed of a transparent plastic material.
【０００３】陽極１２は、仕事関数の大きい金属や合金
によって形成されている。具体的には、Ａｕ（銅）、Ｉ
ＴＯ（インジウム−スズの酸化物）、ＳｎＯ２（酸化ス
ズ）、ＺｎＯ（酸化亜鉛）などを使って形成した透明導
電性膜の電極となっている。なお、電極１２は上記の電
極物質を真空蒸着やスパッタリングなどの方法によって
薄膜形成されている。[0003] The anode 12 is formed of a metal or alloy having a large work function. Specifically, Au (copper), I
The electrode is a transparent conductive film formed using TO (indium-tin oxide), SnO 2 (tin oxide), ZnO (zinc oxide), or the like. The electrode 12 is formed by forming a thin film of the above electrode material by a method such as vacuum evaporation or sputtering.
【０００４】また、正孔輸送層１３、発光層１４、電子
輸送層１５は有機材（有機化合物）によって膜形成され
ている。具体的には、トリス（８−ヒドロキシキノリラ
ト）アルミニウム（Ａｌｑ３）及びＮ，Ｎ−ビス（３−
メチルフェニル）−Ｎ，Ｎ−ジフェニル−（１，１’−
ビフェニル）−４，４’−ジアミン（ＴＰＤ）によって
代表される低分子系材料、ポリ−Ｐ−フェニレンビニレ
ン(ＰＰＶ)誘導体によって代表される高分子系材料が使
用されている。The hole transport layer 13, the light emitting layer 14, and the electron transport layer 15 are formed of organic materials (organic compounds). Specifically, tris (8-hydroxyquinolylato) aluminum (Alq 3 ) and N, N-bis (3-
Methylphenyl) -N, N-diphenyl- (1,1′-
A low molecular material represented by biphenyl) -4,4'-diamine (TPD) and a high molecular material represented by poly-P-phenylenevinylene (PPV) derivative are used.
【０００５】上記陰極１６は、仕事関数の小さい金属や
合金、または、これら金属や合金の混合物によって形成
されている。具体的には、Ｃａ（カルシウム）、Ａｌ
（アルミニウム）、Ａｌ−Ｌｉ（リチウム）合金、Ｍｇ
（マグネシウム）−Ａｇ（銀）合金、Ｍｇ−Ａｌ合金、
Ｍｇ−Ｉｎ（インジウム）合金などを真空蒸着やスパッ
タリングなどの方法によって薄膜形成した電極となって
いる。The cathode 16 is formed of a metal or alloy having a low work function, or a mixture of these metals or alloys. Specifically, Ca (calcium), Al
(Aluminum), Al-Li (lithium) alloy, Mg
(Magnesium) -Ag (silver) alloy, Mg-Al alloy,
The electrode is formed by forming a thin film of a Mg-In (indium) alloy or the like by a method such as vacuum deposition or sputtering.
【０００６】上記した有機発光素子は、陽極１２と陰極
１６とに直流電圧を印加することにより、陽極１２より
注入される正孔が正孔輸送層１３を経て発光層１４に送
られる。また、陰極１６より注入される電子が電子輸送
層１５を経て発光層１４に送られる。発光層１４では正
孔と電子とが再結合し、これによって発光層１４の有機
材が励起状態となり励起子が生成する。In the organic light emitting device described above, holes injected from the anode 12 are sent to the light emitting layer 14 via the hole transport layer 13 by applying a DC voltage to the anode 12 and the cathode 16. Further, electrons injected from the cathode 16 are sent to the light emitting layer 14 via the electron transport layer 15. In the light emitting layer 14, holes and electrons are recombined, whereby the organic material of the light emitting layer 14 is brought into an excited state to generate excitons.
【０００７】このように生成した励起子は発光層１４内
を拡散し、続いてその基底状態へと脱励起され、その時
に発光し、この発光が正孔輸送層１３、陽極１２、ガラ
ス基板１１を通って射出される。The exciton thus generated diffuses in the light emitting layer 14 and is subsequently de-excited to its ground state, and emits light at that time. This light emission is generated by the hole transport layer 13, the anode 12, and the glass substrate 11 Injected through.
【０００８】図１０は、発光層１４が電子輸送層１５を
兼ねるように構成された有機発光素子の簡略構成図であ
る。この発光素子は、ガラス基板１１に陽極１２を膜形
成し、その上に、正孔輸送層１３と発光層１４が積層さ
れており、陰極１６が発光層１４に膜形成されている。FIG. 10 is a simplified structural view of an organic light emitting device in which the light emitting layer 14 also serves as the electron transport layer 15. In this light-emitting element, an anode 12 is formed on a glass substrate 11, a hole transport layer 13 and a light-emitting layer 14 are laminated thereon, and a cathode 16 is formed on the light-emitting layer 14.
【０００９】図１１は、発光層１４が正孔輸送層１３を
兼ねる有機発光素子の簡略構成図である。この発光素子
は、ガラス基板１１に陽極１２を膜形成し、その上に発
光層１４と電子輸送層１５とが積層されており、陰極１
６が電子輸送層１５に膜形成されている。FIG. 11 is a simplified structural view of an organic light emitting device in which the light emitting layer 14 also functions as the hole transport layer 13. In this light emitting device, an anode 12 is formed as a film on a glass substrate 11, on which a light emitting layer 14 and an electron transport layer 15 are laminated.
6 is formed on the electron transport layer 15.
【００１０】図１２は、正孔輸送層１３と電子輸送層１
５を備えない有機発光素子の簡略構成図である。この発
光素子は、ガラス基板１１に陽極１２を膜形成し、その
上に発光層１４が積層されており、陰極１６が発光層１
４に膜形成されている。FIG. 12 shows the hole transport layer 13 and the electron transport layer 1.
FIG. 5 is a simplified configuration diagram of an organic light-emitting device that does not include 5; In this light emitting device, an anode 12 is formed on a glass substrate 11, a light emitting layer 14 is laminated thereon, and a cathode 16 is
4 is formed.
【００１１】図１０、図１１、図１２に示す有機発光素
子は、図９に示した有機発光素子と同様に陽極１２と陰
極１６とに直流電圧を印加することにより発光し、この
発光が陽極１２とガラス基板１１を通って射出する。The organic light-emitting device shown in FIGS. 10, 11 and 12 emits light by applying a DC voltage to the anode 12 and the cathode 16, similarly to the organic light-emitting device shown in FIG. Inject through 12 and the glass substrate 11.
【００１２】[0012]
【発明が解決しようとする課題】上記した有機発光素子
は、発光駆動中に陰極材成分が発光層やその他の有機層
内に入って拡散することから、拡散する陰極材成分のた
めに発光輝度が低下する。In the above-mentioned organic light-emitting device, the cathode material component enters the light-emitting layer and other organic layers during light emission driving and diffuses. Decrease.
【００１３】また、有機層内に陰極材成分が拡散する
と、この陰極材成分を通して陽極にリ−ク電流が流れる
ことがあり、このため、有機発光素子が発光しないこと
があるという問題が生ずる。Further, when the cathode material component diffuses into the organic layer, a leak current may flow to the anode through the cathode material component, thereby causing a problem that the organic light emitting element may not emit light.
【００１４】本発明は上記した実情にかんがみ、有機層
に入る陰極材成分を防止して発光輝度を高め、かつ、確
実に発光する有機発光素子を提供することを目的とす
る。SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an organic light-emitting device that prevents a cathode material component from entering an organic layer, increases light emission luminance, and reliably emits light.
【００１５】[0015]
【課題を解決するための手段】上記した目的を達成する
ため、本発明は、透明基板面に成膜形成した透明な陽極
と、この陽極の膜面に積層した有機層と、この有機層の
面上に成膜形成した陰極とからなる有機発光素子に関す
る。To achieve the above object, the present invention provides a transparent anode formed on a transparent substrate surface, an organic layer laminated on the film surface of the anode, and an organic layer formed on the transparent anode. The present invention relates to an organic light-emitting device comprising a cathode formed on a surface.
【００１６】そして、第の１発明では、有機層と陰極と
の界面に金属と錯体形成する配位子層を設け、陰極から
有機層に拡散する陰極材成分を防止する構成としたこと
を特徴とする有機発光素子を提案する。The first invention is characterized in that a ligand layer which forms a complex with a metal is provided at the interface between the organic layer and the cathode to prevent a cathode material component from diffusing from the cathode to the organic layer. Is proposed.
【００１７】第２の発明としては、有機層に金属と錯体
形成する配位子を混入させ、陰極から有機層に拡散する
陰極材成分を防止する構成としたことを特徴とする有機
発光素子を提案する。According to a second aspect of the present invention, there is provided an organic light emitting device having a structure in which a ligand which forms a complex with a metal is mixed in an organic layer to prevent a cathode material component from diffusing from a cathode to an organic layer. suggest.
【００１８】第３の発明としては、有機層のポリマ−マ
トリックス中に金属と錯体形成する配位子を分散させて
配位子層を形成し、陰極から有機層に拡散する陰極材成
分を防止する構成としたことを特徴とする有機発光素子
を提案する。According to a third aspect of the present invention, a ligand which forms a complex with a metal is dispersed in a polymer matrix of an organic layer to form a ligand layer, and a cathode material component which diffuses from the cathode to the organic layer is prevented. The present invention proposes an organic light-emitting device characterized by having such a configuration.
【００１９】[0019]
【作用】このように構成した有機発光素子は、有機層と
陰極との間、或いは、有機層のポリマ−マトリックス中
に設けた配位子層または有機層に混入させた配位子が陰
極材成分と錯体形成し、有機層に拡散する陰極材成分が
防止される。この結果、陰極材成分による発光輝度の低
下がなく、また、陰極材成分を通して陽極に流れるリ−
ク電流が発生しない。The organic light emitting device thus constructed is characterized in that a ligand layer provided between an organic layer and a cathode, or in a polymer matrix of the organic layer, or a ligand mixed in the organic layer is a cathode material. A cathode material component that forms a complex with the component and diffuses into the organic layer is prevented. As a result, the emission luminance does not decrease due to the cathode material component, and the leakage flowing to the anode through the cathode material component is prevented.
No current is generated.
【００２０】[0020]
【発明の実施の形態】次に、本発明の実施形態について
図面に沿って説明する。図1は、配位子層を設けた有機
発光素子の実施形態を示す簡略構成図である。Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a simplified configuration diagram showing an embodiment of an organic light emitting device provided with a ligand layer.
【００２１】本実施形態の有機発光素子は、透明なガラ
ス基板１１（または、透明なプラスチック基板）１１の
面上に、透明な陽極１２、正孔輸送層１３、発光層１
４、電子輸送層１５を従来例同様に順次成膜形成し、さ
らに、電子輸送層１５の上に配位子層１０を薄膜形成
し、この配位子層１０の面上に陰極１６を金属電極とし
て成膜形成した構成としてある。The organic light emitting device of the present embodiment comprises a transparent glass substrate 11 (or a transparent plastic substrate) 11 on a transparent anode 12, a hole transport layer 13, and a light emitting layer 1.
4. An electron transport layer 15 is sequentially formed as in the conventional example, and a ligand layer 10 is formed on the electron transport layer 15 in a thin film. A cathode 16 is formed on the surface of the ligand layer 10 by a metal. The electrode is formed as a film.
【００２２】上記のように電子輸送層１５と陰極１６と
の間に設けた配位子層１０は、陰極材成分（金属）と錯
体を形成するバッファ層として作用する。つまり、陰極
１６から有機層（１３、１４、１５）へ拡散しようとす
る金属を配位子層１０で錯体を形成させ、有機層への拡
散を防止する。As described above, the ligand layer 10 provided between the electron transport layer 15 and the cathode 16 functions as a buffer layer that forms a complex with the cathode material component (metal). In other words, the ligand layer 10 forms a complex with the metal that is going to diffuse from the cathode 16 to the organic layers (13, 14, 15), and prevents the metal from diffusing into the organic layer.
【００２３】上記した配位子層１０は次に示すような配
位子材料を用いることができる。 The above-mentioned ligand layer 10 can use the following ligand materials.
【００２４】また、配位子層１０は、上記の配位子材料
を用い、スピンコ−ト、ディップコ−トなどのウェット
プロセス、或いは、真空蒸着などのドライプロセスによ
って薄膜形成することができる。The ligand layer 10 can be formed into a thin film using the above-mentioned ligand material by a wet process such as spin coating or dip coating or a dry process such as vacuum deposition.
【００２５】図２は、発光層１４が電子輸送層を兼ねる
従来例同様の有機発光素子に実施する形態で、この発光
素子の場合は、発光層１４と陰極１６との間に上記した
配位子層１０を設ける。FIG. 2 shows an embodiment in which the light emitting layer 14 also functions as an electron transporting layer in the same organic light emitting element as the conventional example. In the case of this light emitting element, the above-described coordination between the light emitting layer 14 and the cathode 16 is performed. The child layer 10 is provided.
【００２６】図３は、発光層１４が正孔輸送層を兼ねる
従来例同様の有機発光素子に実施する形態で、この発光
素子の場合は、正孔輸送層１５と陰極１６との間に上記
した配位子層１０を設ける。FIG. 3 shows an embodiment in which the light emitting layer 14 also functions as a hole transport layer in the same organic light emitting device as the conventional example. The prepared ligand layer 10 is provided.
【００２７】図４は、発光層１４が電子輸送層と正孔輸
送層とを兼ねる従来例同様の有機発光素子に実施する形
態で、この発光素子の場合は、発光層１４と陰極１６と
の間に上記した配位子層１０を設ける。FIG. 4 shows an embodiment in which the light-emitting layer 14 is used as an organic light-emitting element similar to the conventional example in which the electron-transport layer also functions as a hole-transport layer. The above-described ligand layer 10 is provided therebetween.
【００２８】一方、配位子層は、成膜性の向上、配位子
量の調整のために、有機層のポリマ−マトリックス中に
分散させた膜として設けることができる。On the other hand, the ligand layer can be provided as a film dispersed in a polymer matrix of an organic layer in order to improve the film forming property and adjust the amount of the ligand.
【００２９】すなわち、ウェットプロセスで配位子層を
成膜形成する場合、有機材料であるポリスチレン、ポリ
メタクリル酸メチル、ポリカ−ボネ−ト等の高分子化合
物と共に配位子材料を溶媒にとかして成膜することによ
って、ポリマ−マトリックス中に配位子分散させた配位
子層を形成することができる。That is, when the ligand layer is formed by a wet process, the ligand material is dissolved in a solvent together with a high molecular compound such as polystyrene, polymethyl methacrylate, or polycarbonate, which is an organic material. By forming a film, a ligand layer in which a ligand is dispersed in a polymer matrix can be formed.
【００３０】また、ドライプロセスで成膜形成する場合
は、ポリマ−の蒸着重合時に配位子材料を同時に蒸着し
てポリマ−マトリックス中に配位子を分散させることに
よって配位子層を形成することができる。When a film is formed by a dry process, a ligand layer is formed by simultaneously depositing a ligand material during vapor deposition polymerization of a polymer and dispersing the ligand in a polymer matrix. be able to.
【００３１】[0031]
【実施例１】ガラス基板１１に陽極１２としてＩＴＯを
薄膜形成した基板の面上に、発光層１４として、ｐｏｌ
ｙ（２−ｍｅｔｈｏｘｙ，５−（２’−ｅｔｈｙｌ−ｈ
ｅｘｏｘｙ）−１，−ｐｈｅｎｙｌｅｎｅ−ｖｉｎｙｌ
ｅｎｅ）（ＭＥＨ−ＰＰＶ）をスピンコ−トにより成膜
し、その上に配位子層１０として、アセチルアセトンを
スピンコ−トにより積層し、さらに、陰極１６として、
Ｃａを蒸着し、続いて、Ａｌを蒸着して成膜し、有機発
光素子を構成した。Example 1 A luminescent layer 14 was formed on a glass substrate 11 on which a thin film of ITO was formed as an anode 12.
y (2-methoxy, 5- (2′-ethyl-h)
exoxy) -1, -phenylene-vinyl
ene) (MEH-PPV) is formed by spin coating, acetylacetone is laminated thereon as a ligand layer 10 by spin coating, and
An organic light emitting device was formed by depositing Ca and subsequently depositing Al to form a film.
【００３２】この有機発光素子を駆動して評価したとこ
ろ、初期の輝度低下がなく、輝度の半減時間が４倍程度
に延びた。（従来品：初期の輝度低下率は４０％、輝度
の半減時間は５時間）また、リ−ク電流によって発光し
なくなる現象は見られなかった。なお、初期の輝度低下
率は、初期段階で輝度が低下する物の率、半減時間は、
輝度が半減するまでの時間である。When this organic light emitting device was driven and evaluated, there was no initial decrease in luminance, and the half time of luminance was extended to about four times. (Conventional product: Initial luminance reduction rate is 40%, half-time of luminance is 5 hours) Also, no phenomenon was observed in which light emission did not stop due to leak current. In addition, the initial luminance reduction rate is the rate of the object whose luminance decreases in the initial stage, the half-life is
This is the time until the luminance is reduced by half.
【００３３】図５は、有機層に配位子を混入させた有機
発光素子の実施形態を示す簡略構成図である。本実施形
態の有機発光素子は、透明なガラス基板（または、透明
なプラスチック基板）１１に、透明な陽極１２を膜形成
した基板に、正孔輸送層１３Ｃ、発光層１４Ｃ、電子輸
送層１５Ｃ、陰極１６を順次に成膜形成した構成となっ
ている。FIG. 5 is a simplified configuration diagram showing an embodiment of an organic light emitting device in which a ligand is mixed in an organic layer. The organic light emitting device of this embodiment includes a transparent glass substrate (or a transparent plastic substrate) 11, a transparent anode 12 formed on a substrate, a hole transport layer 13C, a light emitting layer 14C, an electron transport layer 15C, The cathode 16 is formed by sequentially forming a film.
【００３４】この有機発光素子において、陽極１２と陰
極１６は従来例と同様のものであるが、正孔輸送層１３
Ｃ、発光層１４Ｃ、電子輸送層１５Ｃの有機層について
は、従来例で説明した有機材料に配位子材料を混入させ
て成膜してある。In this organic light emitting device, the anode 12 and the cathode 16 are the same as those in the conventional example, but the hole transport layer 13
The organic layers of C, the light emitting layer 14C, and the electron transport layer 15C are formed by mixing a ligand material into the organic material described in the conventional example.
【００３５】配位子材料は、上記したように、クラウン
エ−テル誘導体、テトラフェニルボレ−ト誘導体、ＥＤ
ＴＡなどのアミン系化合物、アセチルアセトンなどのジ
ケトン系化合物、また、これらを官能基として含むポリ
マ−（高分子配位子）を用いることができる。As described above, the ligand material includes a crown ether derivative, a tetraphenylborate derivative, ED
An amine compound such as TA, a diketone compound such as acetylacetone, or a polymer (polymer ligand) containing these as a functional group can be used.
【００３６】正孔輸送層１３Ｃ、発光層１４Ｃ、電子輸
送層１５Ｃに配位子を混入させる手段としては、有機材
料と配位子材料とを溶解させ、ウェットプロセスによっ
て成膜し、或いは、ドライプロセスによって有機材料と
配位子材料とを同時蒸着して成膜することができる。As a means for mixing a ligand into the hole transport layer 13C, the light emitting layer 14C, and the electron transport layer 15C, an organic material and a ligand material are dissolved, and a film is formed by a wet process, An organic material and a ligand material can be simultaneously deposited by a process to form a film.
【００３７】このように構成した有機発光素子は、有機
層に混入させた配位子が金属と錯体を形成することか
ら、有機層に拡散する陰極材成分が減少する。この結
果、発光輝度の低下が少なく、リ−ク電流についても減
少し発光が確実なものとなる。In the organic light emitting device thus configured, since the ligand mixed in the organic layer forms a complex with the metal, the cathode material component diffused into the organic layer is reduced. As a result, a decrease in light emission luminance is small, and a leak current is also reduced, thereby ensuring light emission.
【００３８】図６は、電子輸送層１５Ｃを備えない有機
発光素子の実施形態を、図７は正孔輸送層１３Ｃを備え
ない有機発光素子の実施形態を、図８は正孔輸送層１３
Ｃと電子輸送層１５Ｃを備えない有機発光素子の実施形
態を各々示す。FIG. 6 shows an embodiment of the organic light emitting device without the electron transport layer 15C, FIG. 7 shows an embodiment of the organic light emitting device without the hole transport layer 13C, and FIG.
Each of the embodiments of the organic light emitting device without C and the electron transport layer 15C is shown.
【００３９】なお、配位子は、正孔輸送層１３Ｃ、発光
層１４Ｃ、電子輸送層１５Ｃの全ての層に混入してもよ
いが、それらのうちの２層或いは一層について混入させ
る構成としてもよい。The ligand may be mixed in all the layers of the hole transport layer 13C, the light emitting layer 14C, and the electron transport layer 15C, but may be mixed in two or one of them. Good.
【００４０】[0040]
【実施例２】ガラス基板１１に陽極１２としてＩＴＯを
成膜して素子基板を形成した。そして、発光性の有機材
料であるＭＥＨ−ＰＰＶの中に、配位子材料としてアセ
チルアセトンを１０ｗｔ％混入し、これらの材料をスピ
ンコ−トによって上記素子基板面に成膜形成し、続い
て、ＣａとＡｌを蒸着により成膜して有機発光素子を構
成した。Example 2 An element substrate was formed by depositing ITO as an anode 12 on a glass substrate 11. Then, 10% by weight of acetylacetone as a ligand material was mixed into MEH-PPV, which is a luminescent organic material, and these materials were formed into a film on the element substrate surface by spin coating. And Al were deposited by vapor deposition to form an organic light emitting device.
【００４１】このように構成した有機発光素子を駆動し
て評価したところ、初期の輝度低下がなく、輝度の半減
時間が３倍程度に延びた。（従来品：初期の輝度低下率
が４０％、輝度の半減時間は５時間） また、リ−ク電流によって発光しなくなる現象は見られ
なかった。When the organic light-emitting device thus configured was driven and evaluated, there was no initial decrease in luminance and the half-time of luminance was extended to about three times. (Conventional product: Initial luminance reduction rate is 40%, half-time of luminance is 5 hours) Further, no phenomenon was observed in which light emission did not stop due to leak current.
【００４２】以上、本発明の実施形態について説明した
が、上記した他に、ウェットプロセス、ドライプロセス
で成膜した有機層上に配位子材料を置き、熱をかけて熱
拡散させる方法によっても実施することが可能である。Although the embodiments of the present invention have been described above, in addition to the above, a method in which a ligand material is placed on an organic layer formed by a wet process or a dry process and subjected to heat and thermally diffused. It is possible to implement.
【００４３】[0043]
【発明の効果】上記した通り、本発明では、配位子が陰
極材成分と錯体を形成し、有機層に拡散する陰極材成分
を極力減少させる構成としたことから、発光輝度の低下
が少なく、その上、確実に発光する有機発光素子とな
る。As described above, in the present invention, the ligand forms a complex with the cathode material component and the cathode material component diffused into the organic layer is reduced as much as possible. In addition, the organic light emitting device emits light reliably.
【図１】配位子層を設けた実施形態を示す有機発光素子
の簡略構成図である。FIG. 1 is a simplified structural view of an organic light emitting device showing an embodiment provided with a ligand layer.
【図２】発光層が電子輸送層を兼ねる構成の有機発光素
子の実施形態を示す図１同様の簡略構成図である。FIG. 2 is a simplified structural view similar to FIG. 1, showing an embodiment of an organic light emitting device in which a light emitting layer also serves as an electron transport layer.
【図３】発光層が正孔輸送層を兼ねる構成の有機発光素
子の実施形態を示す図１同様の簡略構成図である。FIG. 3 is a simplified structural view similar to FIG. 1, showing an embodiment of an organic light emitting device in which a light emitting layer also serves as a hole transport layer.
【図４】発光層が電子輸送層と正孔輸送層を兼ねる構成
の有機発光素子の実施形態を示す図１同様の簡略構成図
である。FIG. 4 is a simplified structural view similar to FIG. 1 showing an embodiment of an organic light emitting device in which a light emitting layer serves as an electron transport layer and a hole transport layer.
【図５】正孔輸送層、発光層、電子輸送層に配位子を混
入させた実施形態を示す有機発光素子の置簡略構成図で
ある。FIG. 5 is a simplified configuration diagram of an organic light emitting device showing an embodiment in which a ligand is mixed in a hole transport layer, a light emitting layer, and an electron transport layer.
【図６】発光層が電子輸送層を兼ねる構成の有機発光素
子の実施形態を示す図５同様の簡略構成図である。FIG. 6 is a simplified structural view similar to FIG. 5, showing an embodiment of an organic light emitting device in which a light emitting layer also serves as an electron transport layer.
【図７】発光層が正孔輸送層を兼ねる構成の有機発光素
子の実施形態を示す図５同様の簡略構成図である。FIG. 7 is a simplified structural view similar to FIG. 5, showing an embodiment of an organic light emitting device in which a light emitting layer also serves as a hole transport layer.
【図８】発光層が電子輸送層と正孔輸送層を兼ねる構成
の有機発光素子の実施形態を示す図５同様の簡略構成図
である。FIG. 8 is a simplified structural diagram similar to FIG. 5, showing an embodiment of an organic light emitting device in which a light emitting layer serves as an electron transport layer and a hole transport layer.
【図９】従来例として示した有機発光素子の簡略構成図
である。FIG. 9 is a simplified configuration diagram of an organic light emitting device shown as a conventional example.
【図１０】発光層が電子輸送層を兼ねる構成の従来の有
機発光素子を示す図９同様の簡略構成図である。FIG. 10 is a simplified structural view similar to FIG. 9 showing a conventional organic light emitting device having a structure in which a light emitting layer also serves as an electron transport layer.
【図１１】発光層が正孔輸送層を兼ねる構成の従来の有
機発光素子を示す図９同様の簡略構成図である。FIG. 11 is a simplified structural view similar to FIG. 9 showing a conventional organic light emitting device having a structure in which a light emitting layer also serves as a hole transport layer.
【図１２】発光層が正孔輸送層と電子輸送層とを兼ねる
構成の従来の有機発光素子を示す図９同様の簡略構成図
である。FIG. 12 is a simplified configuration diagram similar to FIG. 9 showing a conventional organic light-emitting device having a configuration in which a light-emitting layer serves both as a hole transport layer and an electron transport layer.
１０ 配位子層 １１ ガラス基板 １２ 陽極 １３、１３Ｃ 正孔輸送層 １４、１４Ｃ 発光層 １５、１５Ｃ 電子輸送層 １６ 陰極 DESCRIPTION OF SYMBOLS 10 Ligand layer 11 Glass substrate 12 Anode 13, 13C Hole transport layer 14, 14C Light emitting layer 15, 15C Electron transport layer 16 Cathode
Claims (3)
と、この陽極の膜面に積層した有機層と、この有機層の
面上に成膜形成した陰極とからなる有機発光素子におい
て、 有機層と陰極との界面に金属と錯体形成する配位子層を
設け、陰極から有機層に拡散する陰極材成分を防止する
構成としたことを特徴とする有機発光素子。An organic light emitting device comprising: a transparent anode formed on a transparent substrate surface; an organic layer laminated on the film surface of the anode; and a cathode formed on the surface of the organic layer. An organic light-emitting device having a structure in which a ligand layer forming a complex with a metal is provided at an interface between an organic layer and a cathode to prevent a cathode material component from diffusing from the cathode to the organic layer.
と、この陽極の膜面に積層した有機層と、この有機層の
面上に成膜形成した陰極とからなる有機発光素子におい
て、 有機層に金属と錯体形成する配位子を混入させ、陰極か
ら有機層に拡散する陰極材成分を防止する構成としたこ
とを特徴とする有機発光素子。2. An organic light emitting device comprising a transparent anode formed on a transparent substrate surface, an organic layer laminated on the film surface of the anode, and a cathode formed on the surface of the organic layer. An organic light-emitting device, wherein a ligand that forms a complex with a metal is mixed into an organic layer to prevent a cathode material component from diffusing from a cathode to an organic layer.
と、この陽極の膜面に積層した有機層と、この有機層の
面上に成膜形成した陰極とからなる有機発光素子におい
て、 有機層のポリマ−マトリックス中に金属と錯体形成する
配位子を分散させて配位子層を形成し、陰極から有機層
に拡散する陰極材成分を防止する構成としたことを特徴
とする有機発光素子。3. An organic light emitting device comprising a transparent anode formed on a transparent substrate surface, an organic layer laminated on the film surface of the anode, and a cathode formed on the organic layer surface. An organic material, wherein a ligand that forms a complex with a metal is dispersed in a polymer matrix of an organic layer to form a ligand layer, and a cathode material component that diffuses from the cathode to the organic layer is prevented. Light emitting element.
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| JP2000382187A JP4716152B2 (en) | 2000-12-15 | 2000-12-15 | Organic light emitting device |
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| EP1401033A2 (en) | 2002-09-19 | 2004-03-24 | Samsung SDI Co. Ltd. | Organic electroluminescent device and manufacturing method thereof |
| US7229704B2 (en) * | 2003-06-26 | 2007-06-12 | Seiko Epson Corporation | Organic electroluminescent device and method of manufacturing the same, and electronic apparatus |
| US7659011B2 (en) | 2003-08-08 | 2010-02-09 | Seiko Epson Corporation | Organic electroluminescent device, method for manufacturing the same, and electronic appliance |
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| US7170086B2 (en) | 2002-09-19 | 2007-01-30 | Samsung Electronics Co., Ltd. | Organic electroluminescent device, electronic device and manufacturing method thereof |
| US7229704B2 (en) * | 2003-06-26 | 2007-06-12 | Seiko Epson Corporation | Organic electroluminescent device and method of manufacturing the same, and electronic apparatus |
| US7659011B2 (en) | 2003-08-08 | 2010-02-09 | Seiko Epson Corporation | Organic electroluminescent device, method for manufacturing the same, and electronic appliance |
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|---|---|
| JP4716152B2 (en) | 2011-07-06 |
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