Light emitting device

Provided is a green phosphorescent light-emitting device having a long lifetime. The light-emitting device includes a first electrode, a second electrode, and a light-emitting layer, the light-emitting layer is located between the first electrode and the second electrode, the light-emitting layer includes a first organic compound, a second organic compound, and a phosphorescent light-emitting substance, the first organic compound includes a heteroaromatic ring skeleton and an aryl group, and the second organic compound includes a heteroaromatic ring skeleton and an aryl group. The second organic compound has a bicarbazole skeleton, the lowest triplet excitation level of the first organic compound is only derived from the aromatic hydrocarbon group, and the energy of the lowest triplet excitation level of the second organic compound is 2.20 eV or more and 2.65 eV or less. 提供一种寿命长的绿色磷光发光器件。发光器件包括第一电极、第二电极以及发光层，所述发光层位于所述第一电极与所述第二电极之间，所述发光层包含第一有机化合物、第二有机化合物以及磷光发光物质，所述第一有机化合物包含杂芳环骨架及芳烃基，所述第二有机化合物具有联咔唑骨架，所述第一有机化合物的