ORGANIC EL ELEMENT, METHOD FOR MANUFACTURING THE SAME, ORGANIC EL DISPLAY PANEL, AND ORGANIC EL DISPLAY DEVICE

摘要

An organic EL element of the present disclosure is an organic EL element having an inverted structure including a first hole injection layer containing a first organic material whose LUMO level is −4 eV or less. The organic EL element further includes a second hole injection layer containing a second organic material. The second hole injection layer is disposed between the first hole injection layer and an anode. The roughness of a principal surface of the second hole injection layer on the side of the anode is smaller than the roughness of a principal surface of the first hole injection layer on the side of the second hole injection layer. L1, L2, and EA satisfy formula: −EA−2 eV≦L2≦L1+2 eV, where the first organic material has a LUMO level L1, the second organic material has a LUMO level L2, and the anode has an electron affinity EA.

主权项

1. An organic EL element comprising:
a substrate; a cathode; an emitting layer; a first hole injection layer containing a first organic material whose LUMO level is −4 eV or less; an anode; and a second hole injection layer containing a second organic material, wherein the substrate, the cathode, the emitting layer, the first hole injection layer, the second hole injection layer, and the anode are disposed in that order, a roughness of a principal surface of the second hole injection layer on the side of the anode is smaller than a roughness of a principal surface of the first hole injection layer on the side of the second hole injection layer, and L1, L2, and EA satisfy formula (1) below,
−EA−2 eV≦L2≦L1+2 eV  (1) where the first organic material has a LUMO level L1, the second organic material has a LUMO level L2, and the anode has an electron affinity EA.