JP7148271B2 - 化合物、化合物の製造法及びそれを用いた発光材料の製造法 - Google Patents
化合物、化合物の製造法及びそれを用いた発光材料の製造法 Download PDFInfo
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- JP7148271B2 JP7148271B2 JP2018091423A JP2018091423A JP7148271B2 JP 7148271 B2 JP7148271 B2 JP 7148271B2 JP 2018091423 A JP2018091423 A JP 2018091423A JP 2018091423 A JP2018091423 A JP 2018091423A JP 7148271 B2 JP7148271 B2 JP 7148271B2
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- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- 125000004076 pyridyl group Chemical group 0.000 description 1
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- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
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- 229910001415 sodium ion Inorganic materials 0.000 description 1
- WWGXHTXOZKVJDN-UHFFFAOYSA-M sodium;n,n-diethylcarbamodithioate;trihydrate Chemical compound O.O.O.[Na+].CCN(CC)C([S-])=S WWGXHTXOZKVJDN-UHFFFAOYSA-M 0.000 description 1
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- 241000894007 species Species 0.000 description 1
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- JRMUNVKIHCOMHV-UHFFFAOYSA-M tetrabutylammonium bromide Chemical compound [Br-].CCCC[N+](CCCC)(CCCC)CCCC JRMUNVKIHCOMHV-UHFFFAOYSA-M 0.000 description 1
- NLDYACGHTUPAQU-UHFFFAOYSA-N tetracyanoethylene Chemical group N#CC(C#N)=C(C#N)C#N NLDYACGHTUPAQU-UHFFFAOYSA-N 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 125000001544 thienyl group Chemical group 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
- 229910052719 titanium Inorganic materials 0.000 description 1
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- 125000004306 triazinyl group Chemical group 0.000 description 1
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- WLPUWLXVBWGYMZ-UHFFFAOYSA-N tricyclohexylphosphine Chemical compound C1CCCCC1P(C1CCCCC1)C1CCCCC1 WLPUWLXVBWGYMZ-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 229910000404 tripotassium phosphate Inorganic materials 0.000 description 1
- 235000019798 tripotassium phosphate Nutrition 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
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- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C09D165/00—Coating compositions based on macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Coating compositions based on derivatives of such polymers
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- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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- H10K85/322—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising boron
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Description
-BF3Q’(式中、Q’は、Li、Na、K、Rb又はCsを示す。)で表される基;
-MgY’(式中、Y’は、塩素原子、臭素原子又はヨウ素原子を示す。)で表される基;
-ZnY”(式中、Y”は、塩素原子、臭素原子又はヨウ素原子を示す。)で表される基;及び
-Sn(RC3)3(式中、RC3は、水素原子、アルキル基又はアリール基を示し、これらの基は置換基を有していてもよい。複数存在するRC3は同一でも異なっていてもよく、互いに連結して、それぞれが結合するスズ原子とともに環構造を形成していてもよい。)で表される基である。
以下、本明細書で共通して用いられる用語は、特記しない限り、以下の意味である。
Meはメチル基、Etはエチル基、i-Prはイソプロピル基、n-Buはn-ブチル基、t-Buはtert-ブチル基を表す。
「アルコキシ基」は、直鎖、分岐及び環状のいずれでもよい。直鎖のアルコキシ基の炭素原子数は、置換基の炭素原子数を含まないで、通常1~40であり、好ましくは4~10である。分岐及び環状のアルコキシ基の炭素原子数は、置換基の炭素原子数を含まないで、通常3~40であり、好ましくは4~10である。
アリールオキシ基は、置換基を有していてもよく、例えば、フェノキシ基、1-ナフチルオキシ基、2-ナフチルオキシ基、1-アントラセニルオキシ基、9-アントラセニルオキシ基、1-ピレニルオキシ基、及び、これらの基における水素原子が、アルキル基、アルコキシ基、フッ素原子等で置換された基が挙げられる。
高分子化合物は、正孔輸送性が優れるので、下記式(X)で表される構成単位を含むことが好ましい。
ArX2及びArX4で表される少なくとも1種のアリーレン基と少なくとも1種の2価の複素環基とが直接結合した2価の基としては、例えば、下記式で表される基が挙げられ、これらは置換基を有していてもよい。
本明細書でいう原料とは有機EL材料を合成する原料になる化合物をいう。高分子量不純物とは原料である化合物の分子量よりも大きい分子量を有する不純物をいう。高分子量不純物は原料由来の芳香族環が無作為に連結した化学構造を有しており、有機EL材料中に存在することになった場合、有機EL素子中の各層における電荷輸送性のバランスを崩し、有機EL素子としたときの性能を低下させる。有機EL素子の性能を向上させるためには、高分子量不純物は原料から除去する必要がある。
次に、本発明の高分子化合物の製造方法について説明する。
本明細書において、本発明の高分子化合物の製造に使用される化合物を総称して、「原料モノマー」ということがある。
化合物(1) 又は(2)は、高分子化合物の製造においては、いずれも原料モノマーであり、Z1、Z2はそれぞれ独立に、置換基A群及び置換基B群からなる群から選ばれる基を示す。]
塩素原子、臭素原子、ヨウ素原子、-O-S(=O)2RC1(式中、RC1は、アルキル基又はアリール基を示し、これらの基は置換基を有していてもよい。)で表される基。
-B(ORC2)2(式中、RC2は、水素原子、アルキル基又はアリール基を示し、これらの基は置換基を有していてもよい。複数存在するRC2は同一でも異なっていてもよく、互いに連結して、それぞれが結合する酸素原子とともに環構造を形成していてもよい。)で表される基;
-MgY’(式中、Y’は、塩素原子、臭素原子又はヨウ素原子を示す。)で表される基;
組成物は、正孔輸送材料、正孔注入材料、電子輸送材料、電子注入材料、発光材料、酸化防止剤及び溶媒からなる群から選ばれる少なくとも1種の材料と、高分子化合物とを含有する。
正孔輸送材料は、低分子化合物と高分子化合物とに分類され、高分子化合物が好ましく、架橋基を有する高分子化合物がより好ましい。
電子輸送材料は、低分子化合物と高分子化合物とに分類される。電子輸送材料は、架橋基を有していてもよい。
正孔注入材料又は電子注入材料が導電性高分子を含む場合、導電性高分子の電気伝導度は、好ましくは、1×10-5S/cm~1×103S/cmである。導電性高分子の電気伝導度をかかる範囲とするために、導電性高分子に適量のイオンをドープすることができる。
本発明の原料化合物を使用した縮合反応により得られる高分子化合物は発光材料として用いることが出来る。該高分子化合物以外の発行材料を併用してもよい。発光材料は、低分子化合物と高分子化合物とに分類される。発光材料は、架橋基を有していてもよい。
酸化防止剤は、高分子化合物と同じ溶媒に可溶であり、発光及び電荷輸送を阻害しない化合物であればよく、例えば、フェノール系酸化防止剤、リン系酸化防止剤が挙げられる。
膜は、高分子化合物を含有する。
発光素子は、高分子化合物を用いて得られる有機エレクトロルミネッセンス等の発光素子であり、該発光素子には、例えば、高分子化合物を含む発光素子、高分子化合物が分子内、分子間、又は、それらの両方で架橋した発光素子がある。
高分子化合物を用いて得られる層は、通常、発光層、正孔輸送層、正孔注入層、電子輸送層、電子注入層の1種以上の層であり、好ましくは、発光層である。これらの層は、各々、発光材料、正孔輸送材料、正孔注入材料、電子輸送材料、電子注入材料を含む。これらの層は、各々、発光材料、正孔輸送材料、正孔注入材料、電子輸送材料、電子注入材料を、上述した溶媒に溶解させ、インクを調製して用い、上述した膜の作製と同じ方法を用いて形成することができる。
発光素子における基板は、電極を形成することができ、かつ、有機層を形成する際に化学的に変化しない基板であればよく、例えば、ガラス、プラスチック、シリコン等の材料からなる基板である。不透明な基板の場合には、基板から最も遠くにある電極が透明又は半透明であることが好ましい。
発光素子を用いて面状の発光を得るためには、面状の陽極と陰極が重なり合うように配置すればよい。パターン状の発光を得るためには、面状の発光素子の表面にパターン状の窓を設けたマスクを設置する方法、非発光部にしたい層を極端に厚く形成し実質的に非発光とする方法、陽極もしくは陰極、又は両方の電極をパターン状に形成する方法がある。これらのいずれかの方法でパターンを形成し、いくつかの電極を独立にON/OFFできるように配置することにより、数字、文字等を表示できるセグメントタイプの表示装置が得られる。ドットマトリックス表示装置とするためには、陽極と陰極を共にストライプ状に形成して直交するように配置すればよい。複数の種類の発光色の異なる高分子化合物を塗り分ける方法、カラーフィルター又は蛍光変換フィルターを用いる方法により、部分カラー表示、マルチカラー表示が可能となる。ドットマトリックス表示装置は、パッシブ駆動も可能であるし、TFT等と組み合わせてアクティブ駆動も可能である。これらの表示装置は、コンピュータ、テレビ、携帯端末等のディスプレイに用いることができる。面状の発光素子は、液晶表示装置のバックライト用の面状光源、又は、面状の照明用光源として好適に用いることができる。フレキシブルな基板を用いれば、曲面状の光源、及び、表示装置としても使用できる。
2,7-ビス(1,3,2-ジオキサボロラン-2-イル)-9,9-ジオクチルフルオレン(以下F8BEと略す)は特表2002-536492の実施例に従い合成した。
機器:島津製作所LC-10AT (LC-Solution データ処理)
カラム:Zorbax XDB-C8(Agilent製)
移動相:水:アセトニトリル(20:80)一定、1.0mL/分
検出器: UV-Vis(280nm)
機器:島津製作所LC-10AT (LC-Solution データ処理)
カラム:TSKgel G2000HHR(東ソー製)
移動相:THF 1.0mL/分
検出器: VU-Vis 228nm
高純度F8BE
温度計、攪拌翼、冷却管をつけた1Lセパラブルフラスコに合成例1で得られたF8BE200g、ジクロロメタン800gを仕込み、40℃で溶解した。この溶液に活性炭(関東化学、粉末)20gを加え、還流下2時間攪拌した。30℃まで冷却した後、セライト545(関東化学)をプレコートした濾過器で活性炭を濾過し、ジクロロメタン50gで洗浄した。濾液をロータリーエバポレータで400gまで濃縮した。温度計、攪拌翼、冷却管をつけた3Lセパラブルフラスコに濃縮物及びアセトニトリル1100gを仕込み、50℃まで昇温して結晶が溶解したことを確認した後、20℃まで3時間かけて冷却した。20℃で1時間保温した後精製した結晶を濾過、アセトニトリルで洗浄した後、50℃の真空乾燥機で乾燥して高純度F8BE160gを得た。
高純度F8BE
温度計、3枚後退攪拌翼、フィンガーバッフル、冷却管をつけた1Lジャケット付セパラブルフラスコに合成例1で得られたF8BE200g、ヘキサン750gを仕込んだ。プログラム温度調節器を備えた温水循環装置を用いてセパラブルフラスコのジャケットに温水を循環させた。ジャケット温度を60℃に設定して昇温し、結晶が溶解したことを確認した後、攪拌回転数を500rpmとして、10℃/hrの冷却速度で40℃まで冷却した。実施例1で得られた高純度F8BE0.05gを種晶として加え、40℃で1時間保温した。10℃/hrの冷却速度で0℃まで冷却し、0℃で1時間保温した。析出した結晶を濾過、5℃に冷却したヘキサン100gで洗浄した後、50℃の真空乾燥機で乾燥して、高純度F8BE180gを得た。
2,7-ビス(1,3,2-ジオキサボロラン-2-イル)-9,9-ジヘキシルフルオレン(以下F6BEと略す)は特表2002-536492の実施例に従い合成した。
高純度F6BE
温度計、3枚後退攪拌翼、フィンガーバッフル、冷却管をつけた1Lジャケット付セパラブルフラスコに合成例2で得られたF6BE300g、トルエン450gを仕込んだ。プログラム温度調節器を備えた温水循環装置を用いてセパラブルフラスコのジャケットに温水を循環させた。ジャケット温度を80℃に設定して昇温し、結晶が溶解したことを確認した後、攪拌回転数を450rpmとして、10℃/hrの冷却速度で60℃まで冷却した。合成例2で得られたF6BE0.15gを種晶として加え、60℃で1時間保温した。10℃/hrの冷却速度で0℃まで冷却し、0℃で1時間保温した。析出した結晶を濾過、5℃に冷却したトルエン30g及びヘキサン150gで洗浄した後、50℃の真空乾燥機で乾燥して、高純度F6BE240gを得た。
攪拌翼、バッフル、冷却管、温度計をつけたセパラブルフラスコに実施例1で得られたF8BE3.30g、2,7-ジブロモ-2,1,3-ベンゾチアジアゾール1.68g、4,7-ビス(5-ブロモ-2-チエニル)-2,1,3-ベンゾチアジアゾール0.56g、トリカプリルメチルアンモニウムクロリド(Aliquat336)1.1g、トルエン48.6gを仕込み攪拌下90℃まで昇温した。ビストリフェニルホスフィンパラジウム(II)ジクロリド0.005gを仕込み、17.5%炭酸ナトリウム水溶液13gを滴下した。滴下終了後還流下3時間保温した後、室温まで冷却した。
実施例4において、実施例1で得られたF8BEの代わりに合成例1で得られたF8BEを用い、実施例3で得られたF6BEの代わりに合成例2で得られたF6BEを用いた以外は、実施例4と同様に実施し、重合体10gを得た。
得られた赤色重合体の有機溶媒系サイズ排除クロマトグラフ分析法によるポリスチレン換算重量平均分子量は511,000であった。
攪拌翼、バッフル、冷却管、温度計をつけたセパラブルフラスコに合成例1で得られたF8BE10.49g、ビス-(4-ブロモフェニル)-4-(1-メチルプロピル)-ベンゼンアミン9.07gを仕込み、トリカプリルメチルアンモニウムクロリド(Aliquat336)1.8g、トルエン120gを仕込み、攪拌下90℃まで加熱した。酢酸パラジウム(II)0.0044g、トリ(o-トルイル)ホスフィン0.030gを加えた後、17.5%炭酸ナトリウム水溶液36.3gを1時間かけて滴下した。滴下終了後還流下3時間保温した後フェニルホウ酸0.28gを加え、14時間還流下保温した後、室温まで冷却した。
スパッタ法により150nmの厚みでITO膜をつけたガラス基板に、ポリ(3,4)エチレンジオキシチオフェン/ポリスチレンスルフォン酸(Bayer製)の懸濁液をスピンコート法により、約65nmの厚みと成るように製膜し、ホットプレート上で200℃、15分間乾燥した。次に、合成例3で得られた重合体を混合キシレンに0.5重量%の濃度で溶解させ、得られたキシレン溶液を用いてスピンコート法により約10nm程度に製膜後、酸素濃度、及び水分濃度が10ppm以下(重量基準)の窒素雰囲気下で、180℃、15分間乾燥した。次に、実施例4で得られた重合体を混合キシレンに1.6重量%の濃度で溶解させ、得られたキシレン溶液を用いてスピンコート法により約100nmに製膜した。そして、酸素濃度、及び水分濃度が10ppm以下(重量基準)の窒素雰囲気下で、130℃、30分間乾燥した。1.0×10-4Pa以下にまで減圧した後、陰極として、バリウムを約5nm、次いでアルミニウムを約80nm蒸着した。蒸着後、ガラス基板を用いて封止を行うことで、高分子発光素子を作製した。素子構成は次の通りである。
スパッタ法により150nmの厚みでITO膜をつけたガラス基板に、ポリ(3,4)エチレンジオキシチオフェン/ポリスチレンスルフォン酸(Bayer製)の懸濁液をスピンコート法により、約65nmの厚みと成るように製膜し、ホットプレート上で200℃、15分間乾燥した。次に、合成例3で得られた重合体を混合キシレンに0.5重量%の濃度で溶解させ、得られたキシレン溶液を用いてスピンコート法により約10nm程度に製膜後、酸素濃度、及び水分濃度が10ppm以下(重量基準)の窒素雰囲気下で、180℃、15分間乾燥した。次に、比較例1で得られた重合体を混合キシレンに1.6重量%の濃度で溶解させ、得られたキシレン溶液を用いてスピンコート法により約100nmに製膜した。そして、酸素濃度、及び水分濃度が10ppm以下(重量基準)の窒素雰囲気下で、130℃、30分間乾燥した。1.0×10-4Pa以下にまで減圧した後、陰極として、バリウムを約5nm、次いでアルミニウムを約80nm蒸着した。蒸着後、ガラス基板を用いて封止を行うことで、高分子発光素子を作製した。素子構成は次の通りである。
Claims (11)
- 以下の式(1)又は(2)で表される化合物と、該化合物の分子量よりも大きい分子量を有する不純物とを含み、該不純物の含有量が0.15%以下であり、該不純物の含有量は有機溶媒系サイズ排除クロマトグラフ法によるクロマトグラムにおいて式(1)又は(2)と同定されるピークよりも保持時間の短いピークの面積の和の、全ピーク面積の和に対する百分率である組成物。
[ここで、置換基A群は、塩素原子、臭素原子、ヨウ素原子、及び-O-S(=O) 2 R C1 (式中、R C1 は、アルキル基又はアリール基を示し、これらの基はハロゲン原子、シアノ基、アルキル基、アリール基、1価の複素環基、アルコキシ基、アリールオキシ基、アミノ基又は置換アミノ基で表される置換基を有していてもよい。)で表される基であり;
置換基B群は、-B(OR C2 ) 2 (式中、R C2 は、水素原子、アルキル基又はアリール基を示し、これらの基はハロゲン原子、シアノ基、アルキル基、アリール基、1価の複素環基、アルコキシ基、アリールオキシ基、アミノ基又は置換アミノ基で表される置換基を有していてもよい。複数存在するR C2 は同一でも異なっていてもよく、互いに連結して、それぞれが結合する酸素原子とともに環構造を形成していてもよい。)で表される基;
-BF 3 Q’(式中、Q’は、Li、Na、K、Rb又はCsを示す。)で表される基;
-MgY’(式中、Y’は、塩素原子、臭素原子又はヨウ素原子を示す。)で表される基;
-ZnY”(式中、Y”は、塩素原子、臭素原子又はヨウ素原子を示す。)で表される基;及び
-Sn(R C3 ) 3 (式中、R C3 は、水素原子、アルキル基又はアリール基を示し、
これらの基はハロゲン原子、シアノ基、アルキル基、アリール基、1価の複素環基、アルコキシ基、アリールオキシ基、アミノ基又は置換アミノ基で表される置換基を有していてもよい。複数存在するR C3 は同一でも異なっていてもよく、互いに連結して、それぞれが結合するスズ原子とともに環構造を形成していてもよい。)で表される基である。]
- 逆相カラムを使用する高速液体クロマトグラフィーによるクロマトグラムにおいて、面積百分率法による純度が99%を超えるものである請求項1に記載の組成物。
- Z1、Z2で示される脱離基が臭素原子、又は-B(ORC2)2(式中、RC2は、水素原子、アルキル基又はアリール基を示し、これらの基はハロゲン原子、シアノ基、アルキル基、アリール基、1価の複素環基、アルコキシ基、アリールオキシ基、アミノ基又は置換アミノ基で表される置換基を有していてもよい。複数存在するRC2は同一でも異なっていてもよく、互いに連結して、それぞれが結合する酸素原子とともに環構造を形成していてもよい。)で表される基である請求項1又は2に記載の組成物。
- 請求項1~3のいずれか一項に記載の組成物を縮合反応させることにより、式(1)で示される化合物、及び式(2)で示される化合物からなる群から選ばれる少なくとも1種の化合物が縮合重合する工程を包含する、式(Y)で表される構成単位または式(X)で表される構成単位を含む高分子化合物の製造方法。
- 製造される高分子化合物が有機EL材料である請求項4又は5に記載の高分子化合物の製造方法。
- 請求項1~3のいずれか一項に記載の組成物を縮合反応させることにより、式(1)で示される化合物、及び式(2)で示される化合物からなる群から選ばれる1種以上の化合物を縮合重合させて成る、上記式(Y)で表される構成単位または上記式(X)で表される構成単位を含む重合体を含む有機EL材料。
- 請求項1~3のいずれか一項の組成物と上記式(3)で示される化合物を縮合反応させることにより、式(1)で示される化合物、及び式(2)で示される化合物からなる群から選ばれる1種以上の化合物と、上記式(3)で示される化合物を縮合重合させて成る、上記式(Y)で表される構成単位または上記式(X)で表される構成単位を含む重合体を含む有機EL材料。
- 請求項7又は8に記載の有機EL材料と有機溶媒を含む組成物。
- 請求項7又は8に記載の有機EL材料を含む薄膜。
- 請求項10に記載の薄膜を有する有機EL素子。
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