JPWO2012085982A1 - 有機el素子およびその製造方法 - Google Patents
有機el素子およびその製造方法 Download PDFInfo
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- JPWO2012085982A1 JPWO2012085982A1 JP2012549490A JP2012549490A JPWO2012085982A1 JP WO2012085982 A1 JPWO2012085982 A1 JP WO2012085982A1 JP 2012549490 A JP2012549490 A JP 2012549490A JP 2012549490 A JP2012549490 A JP 2012549490A JP WO2012085982 A1 JPWO2012085982 A1 JP WO2012085982A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/15—Deposition of organic active material using liquid deposition, e.g. spin coating characterised by the solvent used
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- 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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
Description
本発明の一態様にかかる有機EL素子の製造方法は、基板と、陰極と、複数の有機層と、陽極とを備え、基板側から、陰極、複数の有機層、陽極の順序で積層されている有機EL素子の製造方法であって、有機ホスフィンオキシド骨格を有するポリマー化合物を含む第一の有機層を形成する第1工程と、第一の有機層上に、有機材料及び非極性溶媒を含む液を塗布する湿式法によって第二の有機層を積層する第2工程とを備える。
(表示パネル100の構成)
図1は、実施の形態に係るインバーテッド構造の有機EL素子を模式的に示す断面図であって、有機EL素子の1つを基板に垂直に切断した断面(図2におけるX方向に沿って切断した断面)を示している。
以下、有機EL素子110の構成を図1に基づいて詳細に説明する。
電子注入層104は、有機ホスフィンオキシド骨格を有するポリマー化合物を主体として形成する。後で詳述するように、この有機ホスフィンオキシド骨格を有するポリマー化合物は、ホスフィンオキシドに3つのアリール基が結合された構造を有し、その電子受容性によって電子輸送性も優れるので、電子注入層104の材料として適した特性を有している。また、それに加えて、ポリマー化合物であるため、低分子系化合物と比べると非極性溶媒に対して溶解しにくい。ここで、この有機ホスフィンオキシド骨格を有するポリマー化合物において、重量平均分子量は、2000以上に設定されていることが、非極性溶媒に対する非溶解性を得る上で好ましい。
表示パネル100の製造方法について、その一例を説明する。
反応性スパッタ法、あるいはプラズマを用いた薄膜形成方法で、TFT及び配線、SD電極、μc−SiからなるTFT層を形成する。
平坦化膜の上に、陰極102用の金属材料を、スパッタ法で薄膜成形して、ウェットエッチングでパターニングすることにより陰極102を形成する。
次に、バンク材料として、例えば感光性のレジスト材料、もしくはフッ素系やアクリル系材料を含有するレジスト材料を、平坦化膜上に塗布し、フォトレジスト法でパターニングすることによってバンク103を形成する。
陰極102の上に、電子注入層104を湿式法で形成する。
電子注入層104の上に、湿式法で発光層105を形成する。
正孔輸送層106の材料と溶媒とを所定比率で混合して正孔輸送層用のインクを作製し、そのインクを発光層105の上に塗布する。
正孔注入層107は、酸化モリブデンや酸化タングステン等の金属酸化物材料を、真空蒸着法などで薄膜形成することができる。
正孔注入層107の表面上に、ITO、IZO等の材料を、真空蒸着法やスパッタ法で成膜することによって陽極108を形成する。
(ポリマー化合物の製造方法)
上記一般構造式(1)で表されるポリマー化合物の製造方法について説明する。
上記の有機EL素子110においては、電子注入層104に、上述した有機ホスフィンオキシド骨格を有するポリマー化合物が含まれている。これらのポリマー化合物は、成膜性に優れ、ホスフィンオキシドに3つのアリール基が結合した構造を持ち、電子受容性を有し、電子注入性に優れており、且つ、非極性溶媒に対して不溶性である。
〔電子輸送材料の耐溶剤性試験〕
図6(a)〜(c)、図7において、構造式(3),(6)で示す実施例にかかるポリマー化合物、並びに、図8において構造式(11)で示す比較例にかかる低分子化合物について、以下のようにしてトルエンに対する耐久性を調べた。
なお、実施例にかかる構造式(3)で示すポリマー化合物については、下記の合成方法で製造した重量平均分子量Mwが3300のものと、重量平均分子量Mwが10000のものと、重量平均分子量Mwが1821のものについて、各々トルエン耐久性を調べた。
石英基板の表面上に、各サンプルのポリマー化合物の塗膜を形成した。塗膜形成方法は、大気中において、各化合物の溶液を基板上にスピンコートで塗布し、100℃で30分間真空乾燥して形成し、膜厚は約100nmとした。
有機ホスフィンオキシド骨格を有するポリマー化合物において、ポリマー化合物の重量平均分子量Mwは2000以上であることが好ましい。これは、重量平均分子量Mwが2000以上であれば非極性溶媒に対して十分な不溶性を持つからである。
〔有機ホスフィンオキシド骨格を有するポリマー化合物の合成方法〕
構造式(3),(6)で示したポリマー化合物の合成方法について説明する。
Sciffers等の方法に基づいて、クロロ(ジエチルアミノ)フェニルホスフィンを合成した。
なお、クロロ(ジエチルアミノ)ホスフィンは、水分、酸素により分解するため、クロロ(ジエチルアミノ)ホスフィンの合成での後処理は、アルゴン雰囲気下で操作を行う。
窒素雰囲気下、−80℃において、2,7-ジブロモ-9,9-ジメチルフルオレン7.04g (20mmol)のTHF溶液150mLに、1.6Mのn−ブチルリチウム ヘキサン溶液27.5mL(44 mmol)を、30分間かけて滴下し、−80℃で2時間撹拌した。これによって、2,7-ジブロモ-9,9-ジメチルフルオレンがリチオ化される。
MS (FAB+, 3-ニトロベンジルアルコール) m/z 443 (M+H)
1H NMR (CDCl3, 60 Hz) d 1.51 (s, 6H, CH3)、d 7.56 - 8.04 (m, 16H)、d 8.17 (d, 2H, 1J = 481 Hz, PH)
3. 2,7-ビス(フェニルホスフィノイル)フルオレンと1,4-ジヨードベンゼンとの重合
3−1
(1) 2,7-ビス(フェニルホスフィノイル)フルオレン(モノマー)、ジヨードベンゼン、触媒、配位子、塩基を溶媒に溶かし、所定温度で20時間加熱攪拌した。
p-Diiodobenzene :0.165 g(0.5 mmol)
Palladium diacetate :2.3 mg(0.01 mmol)
1,3-Bis(diphenylphosphino)propane :8.3 mg(0.02 mmol)
N,N-dimethylaminopyridine :0.916 mL(5.35 mmol)
Dimethyl sulfoxide :2.5 mL(35.2 mmol)
(2)反応終了後、1N 塩酸 40mLに注ぎ、ジクロロメタン30mLで3回抽出した。
1H NMR(60 MHz, CDCl3) d1.43(s br, 6H, CH3)、7.27-8.02 (m, 20H, Ar-H)
IR(KBr) u 3402, 2919, 1598, 1438, 1182, 1113, 1002, 692, 554 cm-1
*収率Xは、繰り返し構造あたりの分子量(516)をもとに算出した。
上記3−1とは別の条件で、以下のように重合反応を行った。
窒素雰囲気下、−80℃で、2,2'-ビチオフェン3.00g(18mmol)のTHF溶液に、1.6Mのn-ブチルリチウム ヘキサン溶液25mL(40mmol)を10分間かけて加えた。
MS (FAB+, 3-ニトロベンジルアルコール) m/z 415 (M+H)
1H NMR (CDCl3, 60 Hz) d 4.68 (d, 2H, 1J = 73.4 Hz, PH)、d 7.27 - 8.01 (m, 14H)
2.5,5’-ビス(フェニルホスフィノイル)-2,2’-ビチオフェンと1,4-ジヨードベンゼンの重合
5,5’-ビス(フェニルホスフィノイル)-2,2’-ビチオフェン414mg(1mmol)、1,4-ジヨードベンゼン330mg(1mmol)、酢酸パラジウム4.5mg(0.02mmol)、1,3-ビスジフェニルホスフィノプロパン16.5mg(0.04mmol)及びジメチルアミノピリジン1.31g(10.7mmol)を、ジメチルアセトアミド5mLに溶解させ、100℃で4日間反応させた。
Mw 4703, Mn 1279 (pSt基準)
1H NMR (60MHz, CDCl3) d7.28 - 7.83 (m, 16H)
〔上記合成方法の特徴と効果〕
上記図9,10に示した合成方法では、モノマーを合成する工程において、クロロ(ジエチルアミノ)フェニルホスフィンを用いて、これをM−Ar−M(Arはアリール基、Mは金属)と反応させており、それによって、副反応を抑えながら、目的とするモノマーの合成を行うことができるので、反応効率を上げることができる。
実施例1および比較例1〜2にかかる有機EL素子を作製し、その性能を比較することによって、本発明の有用性を考察する。
図5は、実施例1にかかる有機EL素子の構成を示す断面模式図である。
電子輸送層104を形成しない点を除いて、上記実施例1と同様に、比較例1にかかる有機EL素子を作製した。
上記実施例1と同様の基板101の表面上に、陽極をITOで形成し、正孔注入層としてPEDOT:PSSを膜厚70nmで形成し、その上に実施例1と同様に発光層を積層し、電子注入層として膜厚5nmのバリウム(Ba Aldrich製)を真空蒸着法により形成し、陰極として実施例1と同様のアルミニウムを膜厚80nmで積層することで、比較例2にかかる有機EL素子を作製した。
上記実施の形態では、有機ホスフィンオキシド骨格を有するポリマー化合物を溶媒に溶解したインクを塗布する湿式法で電子注入層104を形成したが、電子注入層104を形成する方法は必ずしも湿式法でなくてもよく、有機ホスフィンオキシド骨格を有するポリマー化合物を薄膜形成することによって電子注入層104を形成してもよく、その場合も、電子注入層104の上に非極性溶媒を用いた湿式で発光層105を形成するときに、電子注入層104を構成するポリマー化合物が非極性溶媒に溶解することがないので、同様の効果を奏する。
101 基板
102 陰極
103 バンク
104 電子注入層
105 発光層
106 正孔輸送層
107 正孔注入層
108 陽極
110 有機EL素子
Claims (24)
- 基板と、陰極と、複数の有機層と、陽極とを備え、前記基板側から、陰極、複数の有機層、陽極の順序で積層されている有機EL素子の製造方法であって、
有機ホスフィンオキシド骨格を有するポリマー化合物を含む第一の有機層を形成する第1工程と、
前記第一の有機層上に、有機材料及び溶媒を含む液を用いた湿式法で第二の有機層を積層する第2工程とを備える、
有機EL素子の製造方法。 - 前記ポリマー化合物は、重量平均分子量が2000以上である、
請求項1に記載の有機EL素子の製造方法。 - 前記第一の有機層を湿式法で形成する、
請求項1に記載の有機EL素子の製造方法。 - 前記第2工程における前記溶媒が、ベンゼン環を有する芳香族系の溶媒、及びアルキルまたはアルケンを含む脂肪族系の溶媒からなる群より選ばれる少なくとも1つを含有している、
請求項1に記載の有機EL素子の製造方法。 - 前記第2工程における前記湿式法が、インクジェット法である、
請求項1に記載の有機EL素子の製造方法。 - 前記第二の有機層が、高分子系材料を含有する、
請求項1に記載の有機EL素子の製造方法。 - 前記第二の有機層は、発光層である、
請求項1に記載の有機EL素子の製造方法。 - 前記第二の有機層は、電子輸送層または正孔阻止層である、
請求項1に記載の有機EL素子の製造方法。 - さらに、前記第二の有機層上に、第三の有機層を積層する第三工程を備え、
前記第三の有機層は、芳香族アミン系化合物を含有する、
請求項1に記載の有機EL素子の製造方法。 - 前記基板は、TFT基板である、
請求項1に記載の有機EL素子の製造方法。 - 基板と、陰極と、複数の有機層と、陽極とを備え、前記基板側から、陰極、複数の有機層、陽極の順序で積層されている有機EL素子であって、
前記複数の有機層は、
有機ホスフィンオキシド骨格を有するポリマー化合物を含む第一の有機層と、
前記第一の有機層の陽極側に有機材料が積層されてなる第二の有機層とを備える、
有機EL素子。 - 前記ポリマー化合物は、重量平均分子量が2000以上である、
請求項14に記載の有機EL素子。 - 前記第一の有機層は、さらに、アルカリ金属、アルカリ土類金属、及び希土類金属のうち、少なくとも一種を含む、
請求項14に記載の有機EL素子。 - 前記アルカリ金属、アルカリ土類金属、あるいは希土類金属が、有機金属錯体の形状で前記第一の有機層の中に混合されている、
請求項19に記載の有機EL素子。 - 前記第二の有機層は、発光層である、
請求項14に記載の有機EL素子。 - 前記第二の有機層は、電子輸送層である、
請求項14に記載の有機EL素子。 - 前記複数の有機層は、さらに、前記第二の有機層の陽極側に積層されている第三の有機層を含み、
前記第三の有機層は、芳香族アミン系化合物を含む、
請求項14に記載の有機EL素子。 - 前記基板は、TFT基板である、
請求項14に記載の有機EL素子。
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KR101790372B1 (ko) | 2017-10-25 |
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KR20140000617A (ko) | 2014-01-03 |
WO2012085982A1 (ja) | 2012-06-28 |
US9136475B2 (en) | 2015-09-15 |
US20130092918A1 (en) | 2013-04-18 |
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