(EN) PROBLEM TO BE SOLVED: To obtain the subject element having long life and capable of reducing the driving voltage of an organic EL element by providing a pair of electrodes and an organic luminescent layer containing an electric charge injecting auxiliary and adding a specific phenylenediamine derivative to a hole transporting zone between the above electrodes.
SOLUTION: This element has a pair of electrodes and an organic layer sandwiched between these electrodes and containing a charge injection auxiliary and contains a phenylenediamine derivative represented by formula I (Ar1 to Ar6 are each H, a 1-6C alkyl or the like; X is a single bond, a 6-24C arylene or the like; R1 and R2 are each a 1-6C alkyl, alkoxy or H), formula II (Ar7 to Ar12 are same as Ar1 to Ar6; Y is same as X; R4 and R5 are same as R1 and R2) or formula III (R5 and R6 are same as R1 and R2) and exhibiting 10-4 cm2/V.s hole mobility on using as a layer or a zone in a hole transporting zone provided between the above electrodes. The content of the phenylenediamine derivative is preferably 30-100 mol.%.
COPYRIGHT: (C)2000,JPO
【課題】 有機ＥＬ素子の駆動電圧を低減できるととも
に、駆動時間の長い有機ＥＬ素子を提供する。
イオン化
ポテンシャルが小さくかつ正孔移動度が大きい材料を提
供する。
【解決手段】 一般式（I）
【化１】
（式中、Ａｒ(1)～Ａｒ(6)、Ｒ(1)、Ｒ(2)は、明細書に記載した
とおりである。
）で表され、層または域として用いたと
きの正孔移動度が１０‐(4)ｃｍ(2)／Ｖ・ｓ以上のフェニレ
ンジアミン誘導体を用いて有機発光層内の正孔輸送層を
構成し、有機発光層に電荷注入補助材を添加する。