申请人:Toray Industries, Inc.
公开号:EP2595208A1
公开(公告)日:2013-05-22
Provided is an organic thin film light emitting element which has achieved all of improved luminous efficiency, improved driving voltage and improved durability life. Specifically provided is a light emitting element which comprises a hole transport layer and an electron transport layer between a positive electrode and a negative electrode and emits light by means of electrical energy. The light emitting element is characterized in that: the hole transport layer of the light emitting element contains a compound represented by general formula (1); the electron transport layer contains a donor compound; and the donor compound is an alkali metal, an inorganic salt containing an alkali metal, a complex of an alkali metal and an organic substance, an alkaline earth metal, an inorganic salt containing an alkaline earth metal, or a complex of an alkaline earth metal and an organic substance. (In the formula, R1-R20 each represents one group selected from the group consisting of hydrogen, deuterium, an alkyl group, a cycloalkyl group, an amino group, an aryl group, a heterocyclic group, a heteroaryl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, analkoxy group, an alkylthio group, an arylether group, an arylthioethergroup, a halogen, a cyano group, a -P(=O)R24R25 group and a silyl group;R24 and R25 each represents an aryl group or a heteroaryl group; and these substituents may be further substituted, or adjacent two substituents may combine together to form a ring. Meanwhile, R21-R23 may be the same or different and each represents one group selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group and a heteroaryl group; and these substituents maybe further substituted.)
本发明提供了一种有机薄膜发光元件,它实现了发光效率的提高、驱动电压的提高和耐用寿命的提高。具体地说,本发明提供了一种发光元件,它包括位于正极和负极之间的空穴传输层和电子传输层,并通过电能发光。该发光元件的特征在于:发光元件的空穴传输层含有通式(1)表示的化合物;电子传输层含有供体化合物;供体化合物是碱金属、含碱金属的无机盐、碱金属和有机物的复合物、碱土金属、含碱土金属的无机盐或碱土金属和有机物的复合物。(式中,R1-R20 各代表一个选自氢、氘、烷基、环烷基、氨基、芳基、杂环基、杂芳基、烯基、环烯基、炔基、烷氧基、烷硫基、芳醚基、芳硫醚基、卤素、氰基、-P(=O)R24R25 基和硅烷基的基团;R24 和 R25 分别代表芳基或杂芳基;这些取代基可以进一步被取代,或者相邻的两个取代基可以结合在一起形成一个环。同时,R21-R23 可以相同或不同,各自代表一个选自烷基、环烷基、芳基和杂芳基的基团;这些取代基可能被进一步取代)。