Organic el element, and organic el display panel including light- emitting layer and functional layer with specific hole and electron mobilities relationship

An organic electroluminescence (EL) display panel comprising:

• a plurality of organic EL elements on a substrate, each of the organic EL elements comprising:
• an anode;
• a light-emitting layer;
• a functional layer;
• and a cathode stacked in this order, wherein
• the light-emitting layer and the functional layer are in contact with each other,
• hole mobility of the light-emitting layer is greater than electron mobility of the light-emitting layer,
• the electron mobility of the light-emitting layer is greater than an effective electron mobility of the functional layer, and
• a highest occupied molecular orbital (HOMO) level of a first functional material included in the light-emitting layer is at least 0.4 eV greater than a HOMO level of a second functional material included in the functional layer.

An organic electroluminescence (EL) element comprising:

• an anode;
• a functional layer;
• a light-emitting layer;
• and a cathode stacked in this order, wherein
• the light-emitting layer and the functional layer are in contact with each other,
• electron mobility of the light-emitting layer is greater than hole mobility of the light-emitting layer,
• the hole mobility of the light-emitting layer is equal to or greater than an effective hole mobility of the functional layer, and
• a lowest unoccupied molecular orbital (LUMO) level of a first functional material included in the light-emitting layer is at least 0.4 eV less than a LUMO level of a second functional material included in the functional layer.

An organic electroluminescence (EL) element comprising:

• an anode;
• a functional layer;
• a light-emitting layer;
• and a cathode stacked in this order, wherein
• the light-emitting layer and the functional layer are in contact with each other,
• electron mobility of the light-emitting layer is greater than hole mobility of the light-emitting layer,
• the hole mobility of the light-emitting layer is less than an effective hole mobility of the functional layer, and
• a lowest unoccupied molecular orbital (LUMO) level of a first functional material included in the light-emitting layer is at least 0.2 eV less than a LUMO level of a second functional material included in the functional layer.