JP4400134B2 - 有機el素子用化合物及び有機el素子 - Google Patents
有機el素子用化合物及び有機el素子 Download PDFInfo
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- JP4400134B2 JP4400134B2 JP2003284421A JP2003284421A JP4400134B2 JP 4400134 B2 JP4400134 B2 JP 4400134B2 JP 2003284421 A JP2003284421 A JP 2003284421A JP 2003284421 A JP2003284421 A JP 2003284421A JP 4400134 B2 JP4400134 B2 JP 4400134B2
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Description
本発明に係る有機EL素子用化合物は、上記一般式(1)で表される8,13位が置換され且つ7,14位が未置換のナフトフルオランテン誘導体である。
図1は、本発明に係る有機EL素子の第1実施形態(単層型有機EL)を示す模式断面図である。図1に示す有機EL素子100は、互いに対向して配置されている2つの電極(第1の電極1及び第2の電極2)により、発光層10が挟持された構造を有している。
本発明において用いられるナフタセン誘導体は特に制限されないが、以下の一般式(2)で表される化合物であることが好ましい。式(2)中、R41、R42、R43、R44、R45、R46、R47及びR48は、それぞれ独立に水素原子、置換若しくは非置換のアリール基、アルケニル基、複素環基又はアルキル基を示す。
本発明において用いられるアントラセン誘導体は特に制限されないが、以下の一般式(3)で表される化合物であることが好ましく、以下の一般式(3a)又は(3b)で表される化合物であることがより好ましい。なお、式(3)中、Aはモノフェニルアントリル基又はジフェニルアントリル基を示し、Lは水素原子、単結合、二価又は三価の連結基を示し、n1は1〜3の整数を示す。ここで、n1が2以上の場合、2つ以上のAはそれぞれ同一でも異なるものであってもよい。また、式(3a)及び(3b)中、M1、M2、M3及びM4は、それぞれ独立にアルキル基、シクロアルキル基、アリール基、アルコキシ基、アリールオキシ基、アミノ基又は複素環基を示し、q1、q2、q3及びq4は、それぞれ独立に0〜5の整数を示す。また、n2は1分子中のジフェニルアントリル基の数を示し、L1及びL2は連結基を示す。なお、一般式(3a)において、n2は1〜3の整数であり、n2が1の場合、L1は水素原子であり、n2が2の場合、L1は単結合又はアリーレン基である。また、一般式(3b)において、L2は単結合又はアリーレン基である。
本発明において用いられるテトラアリールジアミン誘導体は、以下の一般式(5)で表される化合物であることが好ましい。式中、M11、M12、M13及びM14(以下「M11〜M14」と略す。)は、それぞれ独立にアリール基、アルキル基、アルコキシ基、アリールオキシ基、アミノ基又はハロゲン原子を示し、M11〜M14の少なくとも1つはアリール基である。r1、r2、r3及びr4(以下「r1〜r4」と略す。)は、それぞれ独立に0〜5の整数であるが、r1〜r4は同時に0になることはない。従って、r1+r2+r3+r4は1以上の整数であり、少なくとも1つのアリール基が存在する条件を満たす数である。M15及びM16は、それぞれ独立にアルキル基、アルコキシ基、アミノ基又はハロゲン原子を示し、r5及びr6は、それぞれ独立に0〜4の整数である。
基板4としては、ガラス、石英等の非晶質基板、Si、GaAs、ZnSe、ZnS、GaP、InP等の結晶基板、Mo、Al、Pt、Ir、Au、Pd、SUS等の金属基板等を用いることができる。また、結晶質又は非晶質のセラミック、金属、有機物等の薄膜を所定基板上に形成したものを用いてもよい。
第1の電極1は陽極でありホール注入電極として機能する。そのため、第1の電極1の材料としては、第1の電極1に隣接する有機層にホールを効率よく注入できる材料が好ましく、かかる観点からは仕事関数が4.5〜5.5eVである材料が好ましい。
第2の電極2は陰極であり電子注入電極として機能する。第2の電極2の材料としては、金属材料、有機金属錯体、金属塩等が挙げられ、発光層10等への電子注入が容易となるように仕事関数が低い材料が好ましい。
有機EL素子用化合物である8,13-ジフェニル-ナフト[2,3-k]フルオランテンを以下の製造方法により作製した。
Jutus Liebigs Ann Chem.,496,170-186 (1932)の記載に準拠して、ナフト[2,3-k]フルオランテン-8,13-ジオンを合成した。
室温、アルゴンガスの気流下で、蒸留トルエン50cm3、蒸留ジエチルエーテル50cm3の混合溶液にブロモベンゼン7gを溶解させた。そこへn-ブチルリチウムのヘキサン溶液(1.57モル/L)を25cm3を滴下ロートより15分かけて加えた。そのまま室温にて1時間攪拌し、フェニルリチウムを調製した。
上記フェニルリチウムを調製したフラスコに室温下にて直接ナフト[2,3-k]フルオランテン-8,13-ジオン6gを加え、そのまま10時間反応させた。蒸留水を30cm3加えて反応を終了させた後、白色沈殿物を回収した。沈殿物は蒸留水、メタノール、ヘキサンの順番で良く洗浄を行った。以上より、白色固体7g(80%)を得た。
上記中間体(ヒドロキシ化合物)3gをTHF50cm3中にけん濁させ、70℃のオイルバス加熱した。そこへSnCl2:HCl(35%)=1:1の溶液を20g添加した。2時間反応させた後、加熱を止めて反応を終了させた。反応液を分液ロートに移してトルエンに溶解させた後、2リットルの蒸留水で洗浄した。トルエン層をビーカーに移し、硫酸マグネシウム5gで乾燥させた後ロータリーエバポレータにて適当に濃縮した。精製はシリカゲルクロマトグラフィーを用いた。以上より、黄色固体2.5g(90%)を得た
(実施例1)
ガラス基板上にRFスパッタ法でITO透明電極(陽極)を100nmの厚さに製膜し、パターニングした。このITO透明電極付き基板を中性洗剤、アセトン、エタノール、純水を用いて超音波洗浄し、乾燥した。透明電極表面をUV/O3洗浄した後、真空蒸着装置の基板ホルダーに固定して、1×10-4Pa以下まで減圧した。次いで、減圧状態を保ったまま、N,N’−ジフェニル−N,N’−ビス[N−ジフェニル−(4−アミノフェニル)]−1,1’−ビフェニル−4,4’−ジアミン(HIM−1)を蒸着速度0.1nm/秒で100nmの厚さに蒸着し、ホール注入層とした。
表1記載のアントラセン誘導体及びナフトフルオランテン誘導体を用いた他は、実施例と同様にして有機EL素子を得(第5実施形態に対応する)、実施例1と同様の評価を行った。なお、アントラセン誘導体であるEHM−2は、化学式(4b)で表される化合物であり、ナフトフルオランテン誘導体であるNFL−2は化学式(I−2)で表される化合物である。
表1記載のアントラセン誘導体を用いナフトフルオランテン誘導体を用いなかった他は、実施例と同様にして有機EL素子を得、実施例1と同様の評価を行った。
実施例1と同様にして、ガラス基板上ITO透明電極(陽極)を形成し、更にホール注入層及びホール輸送層を形成した後に、テトラアリールジアミン誘導体(NPD、化学式(5b)で表される化合物)とナフトフルオランテン誘導体(NFL−1、化学式(I−1)で表される化合物)を重量比92:8で全体の蒸着速度0.1nm/秒で20nmの厚さに蒸着し第1発光層を形成して、更に、アントラセン誘導体(EHM−2、化学式(4b)で表される化合物)とスチリル誘導体(EDM−2、化学式(6)で表される化合物)を重量比98:2で全体の蒸着速度0.1nm/秒で20nmの厚さに蒸着し第2発光層を形成した。
アントラセン誘導体(EHM−2、化学式(4b)で表される化合物)とナフタセン誘導体(EDM−1、上記記載のルブレン)を重量比98:2で全体の蒸着速度0.1nm/秒で20nmの厚さに蒸着して第1発光層を形成し、アントラセン誘導体(EHM−2、化学式(4b)で表される化合物)とナフトフルオランテン誘導体(NFL−1、化学式(I−1)で表される化合物)を重量比92:8で全体の蒸着速度0.1nm/秒で20nmの厚さに蒸着し第2発光層を形成した他は実施例5と同様にして有機EL素子を得(白色発光の第6実施形態に対応する)、実施例1と同様の評価を行った。実施例6の有機EL素子の構成と評価結果をまとめて以下の表3に示す。
アントラセン誘導体(EHM−2、化学式(4b)で表される化合物)とテトラアリールジアミン誘導体(NPD、化学式(5b)で表される化合物)とナフタセン誘導体(EDM−1、上記記載のルブレン)を、重量比が(EHM−2とNPDの合計):(EDM−1)=98:2となるようにして(但し、EHM−2:NPDは重量比で85:15)、全体の蒸着速度0.1nm/秒で20nmの厚さに蒸着して第1発光層を形成し、アントラセン誘導体(EHM−2、化学式(4b)で表される化合物)とテトラアリールジアミン誘導体(NPD、化学式(5b)で表される化合物)とナフトフルオランテン誘導体(NFL−1、化学式(I−1)で表される化合物)を、重量比が(EHM−2とNPDの合計):(NFL−1)=92:8となるようにして(但し、EHM−2:NPDは重量比で85:15)、全体の蒸着速度0.1nm/秒で20nmの厚さに蒸着し第2発光層を形成した他は実施例5と同様にして、有機EL素子を得(白色発光の第6実施形態に対応する)、実施例1と同様の評価を行った。実施例6の有機EL素子の構成と評価結果をまとめて以下の表4に示す。
Claims (14)
- R1及びR2が同一の基である請求項1又は2記載の有機EL素子用化合物。
- 電界の印加により発光及び/又は電荷輸送を生じる、請求項1〜3のいずれか一項に記載の有機EL素子用化合物。
- 前記発光は、青色〜黄色発光である請求項4記載の有機EL素子用化合物。
- 互いに対向して配置されている2つの電極間に、1又は2以上の有機層を備える有機EL素子において、
前記有機層の少なくとも1つは、請求項1〜5のいずれか一項に記載の有機EL素子用化合物を含有する発光層である有機EL素子。 - 前記発光層の少なくとも1つは、アントラセン誘導体及びテトラアリールジアミン誘導体からなる群より選ばれる少なくとも1種のホスト材料を含有しており、
前記有機EL素子用化合物は、前記ホスト材料中に配されている、請求項6記載の有機EL素子。 - 電界の印加により、青色〜黄色発光を生じる請求項6又は7記載の有機EL素子。
- 電界の印加により、白色発光を生じる請求項6又は7記載の有機EL素子。
- 前記有機層の少なくとも1つは、黄色発光材料を含有する、請求項6〜9のいずれか一項に記載の有機EL素子。
- 前記有機層の少なくとも1つは、ナフタセン誘導体を含有する、請求項6〜10のいずれか一項に記載の有機EL素子。
- 前記ナフタセン誘導体を含有する有機層は、前記発光層以外の有機層の少なくとも1つである、請求項11記載の有機EL素子。
- 前記ナフタセン誘導体を含有する有機層の少なくとも1つは、アントラセン誘導体及びテトラアリールジアミン誘導体からなる群より選ばれる少なくとも1種のホスト材料を含有しており、
前記ナフタセン誘導体は、前記ホスト材料中に配されている、請求項12記載の有機EL素子。 - 前記ナフタセン誘導体は、ルブレン又はルブレン誘導体である、請求項12又は13記載の有機EL素子。
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