JP2008120696A - 新規なトリピリジルフェニル誘導体、それよりなる電子輸送材料およびそれを含む有機エレクトロルミネッセンス素子 - Google Patents
新規なトリピリジルフェニル誘導体、それよりなる電子輸送材料およびそれを含む有機エレクトロルミネッセンス素子 Download PDFInfo
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- JP2008120696A JP2008120696A JP2006303131A JP2006303131A JP2008120696A JP 2008120696 A JP2008120696 A JP 2008120696A JP 2006303131 A JP2006303131 A JP 2006303131A JP 2006303131 A JP2006303131 A JP 2006303131A JP 2008120696 A JP2008120696 A JP 2008120696A
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- organic electroluminescence
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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Abstract
Description
特に青色リン光材料についてはエネルギーギャップが大きいためにワイドギャップ化されたホール輸送剤や電子輸送剤が必要になってくる。現在これらリン光材料については、電子輸送材料に従来から使用されているAlq3〔トリス(8−ヒドロキシキノリノラト)アルミニウム〕やBAlq2〔ビス(2−メチル−8−キノリノラト)アルミニウムp−フェニルフェノラート〕等が使用されているが、リン光材料に使用するには十分なエネルギーギャップを持ち合わせていないため新規なワイドギャップな電子輸送材料の開発が必要である。
M.A.Baldo, S.Lamansky, P.E.Burrows, M.E.Thompson, S.R.Forrest Appl.Phys.Lett 1999 75(1) 4−7 Appl.Phys.Lett.,79, 2082(2001) J.Appl.Phys.90 5048(2001) Polyhedron 23 (2004) 419−428
で示されるトリピリジルフェニル誘導体に関する。
本発明の第2は、請求項1記載のトリピリジルフェニル誘導体よりなる電子輸送材料に関する。
本発明の第3は、請求項1記載のトリピリジルフェニル誘導体を含有する有機エレクトロルミネッセンス素子に関する。
正孔注入材料としては、下記化学式に示すPEDOT:PSS(ポリマー混合物)やDNTPDを挙げることができる。
トリス−1,3,5−〔6′−(ピリジン−3″−イル)ピリジン−3′−イル〕ベンゼン{Tris−1,3,5−〔6′−(pyridine−3″−yl)pyridine−3′−yl〕benzene}(Tp33BPYB)の合成
このもののUVスペクトルおよびPLスペクトルは図1および図2に示す。
トリス−1,3,5−〔6′−(ピリジン−3″−イル)ピリジン−3′−イル〕−2,4,6−トリメチルベンゼン{Tris−1,3,5−〔6′−(pyridine−3″−yl)pyridine−3′−yl〕−2,4,6−trimethylbenzene}(Tp33BPYMES)の合成
このもののUVスペクトルおよびPLスペクトルは図1および図2に示す。
トリス−1,3,5−〔5′−(ピリジン−3″−イル)ピリジン−3′−イル〕ベンゼン{Tris−1,3,5−〔5′−(pyridine−3″−yl)pyridine−3′−yl〕benzene}(Tm33BPyB)の合成
精製はカラムクロマトグラフィー法(展開溶媒:クロロホルム/メタノール=20/1)を行い、白い粉末を得た。収率:56.7mol%。
構造確認は1H−NMRで行った。
このもののUVスペクトルおよびPLスペクトルは図1および図2に示す。
Eg=1240÷W
例えば接線を引いて求めた値W(nm)が470nmだったとしたらこの時のEgの値は
Eg=1240÷470=2.63(eV)
と言うことになる。
Ip(イオン化ポテンシャル)は、イオン化ポテンシャル測定装置(例えば理研計器AC−1)を使用して測定し、測定するサンプルがイオン化を開始しだしたところの電圧(eV)の値を読む。
Ea(電子親和力)は、IpからEgを引いた値である。
本明細書における波長に対する強度(intensity a.u.)の測定は、浜松ホトニクス社製ストリークカメラを用いて、クライオスタット中で4.2Kにおいて測定した。
IP=HOMO,Ea=LUMO
図1、2にそれぞれの蒸着膜のUV吸収、PLスペクトルを示した。表1には電気化学特性を示した。UV吸収スペクトルやPLスペクトルからもわかるように吸収端、発光ピークはいずれもTp33BPYB、Tp33BPYMES、Tm33BPYBの順にブルーシフトすることがわかる。この結果より共役系を最も制御できているのがメタ結合で結合したTm33BPYBであるということができる。IpはTp33BPYMES、Tm33BPYBともに6.6eV以上と高いものであり、これら2つの化合物はホールブロック性が高い。
トリス−1,3,5−〔6′−(ピリジン−3″−イル)ピリジン−2′−イル〕ベンゼン{Tris−1,3,5−〔6′−(pyridine−3″−yl)pyridine−2′−yl〕benzene}(Tm23BPyB)の合成
精製はカラムクロマトグラフィー法(展開溶媒:クロロホルム/メタノール=30/1)を行い、白い粉末を得た。収率:74.6mol%。
構造確認は1H−NMRで行った。
トリス−1,3,5−〔6′−(ピリジン−2″−イル)ピリジン−2′−イル〕ベンゼン{Tris−1,3,5−〔6′−(pyridine−2″−yl)pyridine−2′−yl〕benzene}(Tm22BPyB)の合成
精製はカラムクロマトグラフィー法(展開溶媒:クロロホルム/酢酸エチル=2/1)を行い、白い粉末を得た。収率:(2.20g),90.4mol%。
構造確認は1H−NMRおよびMASSで行った。
下記化学構造式
TmPyPhB、Tm23BPyBおよびTm33BPyBの各蒸着膜の吸収スペクトルおよび蛍光スペクトルは、図3および4に示し、その電気化学的特性は下記表に示す。
Tm33BPyBの光学的エネルギーギャップ(Eg)は、吸収スペクトルの吸収端より3.86eVと見積もった。Tm23BPyBは長波長に吸収ピークが現れたため、吸収端より見積もった光学的エネルギーギャップ(Eg)は狭くなり、3.58eVである。大気中光電子分析装置(AC−3)の測定結果より、Tm33BPyBのHOMO値は6.68eVであり、Egとの差より、LUMOの値は2.82eVと見積もった。Tm23BPyBのHOMO値は6.66eVであり、LUMOの値は3.08eVであ5る。Tm23BPyBのLUMOレベルは低いため、電子注入障壁は低いと予測され、電子輸送材料として有機EL素子への応用が期待される。
実施例2で得られたTp33BPYMES
実施例3で得られたTm33BPyB
をそれぞれ電子輸送材料として用いた有機EL素子をつくり、電子輸送材料として代表的なAlq3のみを用いた有機EL素子(比較例2)と対比した。
有機EL素子の構成
比較例2:ITO/α−NPD(50nm)/Alq3(70nm)/LiF(0.5nm)/Al(100nm)
実施例6:ITO/α−NPD(50nm)/Alq3(40nm)/Tp33BPYMES(30nm)/LiF(0.5nm)/Al(100nm)
実施例7:ITO/α−NPD(50nm)/Alq3(40nm)/Tm33BPyB(30nm)/LiF(0.5nm)/Al(100nm)
実施例2で得られたTp33BPYMESを用いて緑リン光素子を作成した。
Tp33BPYMESの代りにBCP/Alq3を用いたものを比較例3とした。
有機EL素子の構成
比較例3:ITO/TPDPES:TBPAH(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(9wt%)(30nm)/BCP(10nm)/Alq3(20nm)/LiF(0.5nm)/Al(100nm)
実施例8:ITO/TPDPES:TBPAH(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(9wt%)(30nm)/Tp33BPYMES(30nm)/LiF(0.5nm)/Al(100nm)
TPDPESは、ポリ〔オキシ−1,4−フェニレンスルホニル−1,4−フェニレンオキシ−1,4−フェニレン(フェニルイミノ)(1,1′−ビフェニル)−4,4′−ジイル(フェニルイミノ)−1,4−フェニレン〕{poly〔oxy−1,4−phenylensulfonyl−1,4−phenyleneoxy−1,4−phenylene)(phenylimino)(1,1′−biphenyl)−4,4′−diyl(phenylimino)−1,4−phenylene〕}(9CI)(CA INDEX NAME)の略称である。
TBPAHはトリス(4−ブロモフェニル)アミニウム ヘキサクロロアンチモネート〔Tris(4−bromophenyl)aminium hexachloroantimonate〕である。
実施例9として、実施例4で得られたTm23BPyBを用い、実施例10として、実施例3で得られたTm33BPyBを用い、それぞれ下記構成の有機EL素子を作り、比較例2の有機EL素子と対比した。
有機EL素子の構成
比較例2;○:ITO/α−NPD(50nm)/Alq3(70nm)/LiF(0.5nm)/Al(100nm)
実施例9;△:ITO/α−NPD(50nm)/Alq3(40nm)/Tm23BPyB(30nm)/LiF(0.5nm)/Al(100nm)
実施例10;◇:ITO/α−NPD(50nm)/Alq3(40nm)/Tm33BPyB(30nm)/LiF(0.5nm)/Al(100nm)
図11に各素子の電流密度−電圧特性を、
図12に各素子の輝度 −電圧特性を、
図13に各素子の視感効率−電圧特性を、
図14に各素子の電流効率−電圧特性を、
図15に各素子の視感効率−輝度特性を、
図16に各素子のELスペクトルを
それぞれ示す。
Tm23BPyBとTm33BPyBのそれぞれの電子輸送性の評価は下記表4に示す。
前記TmPyPhBに対して、実施例4で得られたTm23BPyBと実施例3で得られたTm33BPyBの電子輸送性を評価するため、下記の有機EL素子を作った。
有機EL素子の構成
比較例4;○:ITO/TPDPES(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(8wt%)(30nm)/TmPyPhB(30nm)/LiF(0.5nm)/Al(100nm)
実施例11;△:ITO/TPDPES(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(8wt%)(30nm)/Tm23BPyB(30nm)/LiF(0.5nm)/Al(100nm)
実施例12;◇:ITO/TPDPES(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(8wt%)(30nm)/Tm33BPyB(30nm)/LiF(0.5nm)/Al(100nm)
図17に各素子の電流密度−電圧特性を、
図18に各素子の輝度 −電圧特性を、
図19に各素子の輝度 −電流密度特性を、
図20に各素子の外部量子効率−輝度特性を、
図21に各素子の視感効率−輝度特性を、
図22に各素子の電流効率−電圧特性を、
図23に各素子の視感効率−電圧特性を、
図24に各素子の電流効率−電流密度特性を、
図25に各素子のELスペクトルを
それぞれ示す。
実施例1〜5に準じて、下記本発明のTm24BPyB[トリス−1,3,5−〔6′−(ピリジン−4″−イル)ピリジン−2′−イル〕ベンゼン{Tris−1,3,5−〔6′−(pyridine−4″−yl)pyridine−2′−yl〕benzene}]およびTm34BPyB[トリス−1,3,5−〔6′−(ピリジン−4″−イル)ピリジン−3′−イル〕ベンゼン{Tris−1,3,5−〔6′−(pyridine−4″−yl)pyridine−3′−yl〕benzene}]を作り、これらを用いた有機EL素子と、対比のための下記Tm4PyPhB[トリス−1,3,5−〔3′−(ピリジン−4″−イル)フェニル〕ベンゼン{Tris−1,3,5−〔3′−(pyridine−4″−yl)phenyl〕benzene}]を用いた有機EL素子を作り、その性能を評価した。
比較例5;○:ITO/TPDPES(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(8wt%)(30nm)/Tm4PyPhB(30nm)/LiF(0.5nm)/Al(100nm)
実施例13;△:ITO/TPDPES(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(8wt%)(30nm)/Tm24BPyB(30nm)/LiF(0.5nm)/Al(100nm)
実施例14;◇:ITO/TPDPES(20nm)/TAPC(30nm)/CBP:Ir(ppy)3(8wt%)(30nm)/Tm34BPyB(30nm)/LiF(0.5nm)/Al(100nm)
図26に各素子の電流密度−電圧特性を、
図27に各素子の輝度 −電圧特性を、
図28に各素子の輝度 −電流密度特性を、
図29に各素子の外部量子効率−輝度特性を、
図30に各素子の視感効率−輝度特性を、
図31に各素子の電流効率−電圧特性を、
図32に各素子の視感効率−電圧特性を、
図33に各素子の電流効率−電流密度特性を、
図34に各素子のELスペクトルを
それぞれ示す。
表8のデータは、輝度100cd/m2のときのデータである。ただし、比較例4のみは輝度138cd/m2の時のデータである。
2 陽極(ITO)
3 発光層
4 陰極
5 正孔輸送層(ホール輸送層)
6 電子輸送層
7 正孔注入層(ホール注入層)
8 電子注入層
9 正孔ブロック層(ホールブロック層)
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