| abstract |
PROBLEM TO BE SOLVED: To provide a blue light emitting device having high color purity and long life. SOLUTION: A first layer, a second layer, a light emitting layer, and a third layer are provided between an anode and a cathode, and the first layer is in contact with the anode side of the second layer. The second layer is in contact with the anode side of the light emitting layer, the third layer is in contact with the cathode side of the light emitting layer, and the first layer has the first organic compound. The second layer has a second organic compound, the light emitting layer has an aromatic amine derivative having a pyrene structure, and a host material, and the third layer has a third organic compound. However, the difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is within 0.2 eV, and the HOMO level of the second organic compound and the HOMO level of the host material The difference from the position is within 0.4 eV, and the difference between the LUMO level of the host material and the LUMO level of the third organic compound is within 0.4 eV. [Selection diagram] None |