| 摘要 |
First, a long lifetime organic EL element emitting a blue phosphorescence is provided, and second, a long lifetime organic EL element and illumination and display devices using the organic EL element are provided. These organic EL elements are light emitting layers having an electrode and at least one organic layer on a substrate, and at least one of the organic layers contains a host compound and a phosphorescent compound. In the first element, the host compound has a HOMO of -5.42 eV to -3.50 eV and a LUMO of -1.20 eV to +0.00 eV and the phosphorescent compound has a HOMO of -5.15 eV to -3.50 eV and a LUMO of -1.25 eV to +1.00 eV. In the second element, the phosphorescent compound has a HOMO of -5.15 eV to -3.50 eV and a LUMO of -1.25 eV to +1.00 eV and the hole-transporting host compound has a triplet excitation energy (T1) of 2.7 eV or more. |
