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CN111116454A 发光元件、发光装置、电子设备及照明装置 无效 - 驳回

发光元件、发光装置、电子设备及照明装置
摘要：
本发明的一个方式提供一种包括第一电极、第二电极及其间的EL层的发光元件。EL层包括空穴注入层、第一层、第二层、第三层及第四层的叠层。空穴注入层包含有机受体。第一层、第二层及第三层分别包含第一、第二及第三空穴传输材料。第四层包含主体材料及发光材料。第二空穴传输材料的HOMO能级深于第一空穴传输材料的HOMO能级。主体材料的HOMO能级深于第二空穴传输材料的HOMO能级。第三空穴传输材料的HOMO能级深于或等于主体材料的HOMO能级。第二空穴传输材料的HOMO能级与第三空穴传输材料的HOMO能级之差为0.3eV以下。
摘要（英）：

A light-emitting element including a first electrode, a second electrode, and an EL layer positioned therebetween is provided. The EL layer includes a stack of a hole-injection layer, a first layer, a second layer, a third layer, and a fourth layer; the hole-injection layer includes an organic acceptor; the first layer, the second layer and the third layer include first, second and third hole-transport materials, respectively; and the fourth layer includes a host material and a light-emitting material; the HOMO level of the second hole-transport material is deeper than that of the first hole-transport material; the HOMO level of the host material is deeper than that of the second hole-transport material; the HOMO level of the third hole-transport material is deeper than or equal to that of the host material; and a HOMO level difference between the second and third hole-transport materials is less than or equal to 0.3 eV.

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