Organic electroluminescence element, manufacturing method thereof, and organic electroluminescence display device

An organic electroluminescence element comprising:

• an anode and a cathode;
• a substrate;
• and
• an organic layer, provided between the anode and the cathode, which includes at least an emission layer made of a host material which is doped with an organic light emitting material,
• the organic layer including:
• a hole transport layer, provided between the anode and the emission layer, for transporting a positive hole which has been injected to the organic layer from the anode, and
• an electron transport layer, provided between the cathode and the emission layer, for transporting an electron which has been injected to the organic layer from the cathode,
• the host material being an electron-transporting material, and
• the host material and the organic light emitting material having (i) respective highest occupied molecular orbitals (HOMOs) and (ii) respective lowest unoccupied molecular orbitals (LUMOs) which satisfy the following relational expressions (6) and (7):
• 0 eV<(|LUMO of host material|−|LUMO of organic light emitting material|)≦0.5 eV (6)
• |HOMO of host material|>|HOMO of organic light emitting material| (7)

A method for manufacturing an organic electroluminescence element which comprises an anode and a cathode, a substrate, and an organic layer, provided between the anode and the cathode, which includes at least an emission layer made of a host material which is doped with an organic light emitting material, said method comprising the steps of:

• forming the anode on the substrate;
• forming, on the anode, a hole transport layer for transporting a positive hole which has been injected to the organic layer from the anode;
• forming the emission layer on the hole transport layer;
• forming, on the emission layer, an electron transport layer for transporting an electron which has been injected to the organic layer from the cathode;
• and
• forming the cathode on the electron transport layer,
• in the forming of the emission layer, a hole-transporting material being used as the host material, the emission layer being formed by use of the host material and the organic light emitting material having (i) respective highest occupied molecular orbitals (HOMOs) and (ii) respective lowest unoccupied molecular orbitals (LUMOs) which satisfy the following relational expressions (11) and (12):
• 0 eV<(|HOMO of organic light emitting material|−|HOMO of host material|)<0.5 eV (11)
• |LUMO of host material|<|LUMO of organic light emitting material| (12)

A method for manufacturing an organic electroluminescence element which comprises an anode and a cathode, a substrate, and an organic layer, provided between the anode and the cathode, which includes at least an emission layer made of a host material which is doped with an organic light emitting material, said method comprising the steps of:

• forming the anode on the substrate;
• forming, on the anode, a hole transport layer for transporting a positive hole which has been injected to the organic layer from the anode;
• forming the emission layer on the hole transport layer;
• forming, on the emission layer, an electron transport layer for transporting an electron which has been injected to the organic layer from the cathode;
• and
• forming the cathode on the electron transport layer,
• in the forming of the emission layer, an electron-transporting material being used as the host material, the emission layer being formed by use of the host material and the organic light emitting material having (i) respective highest occupied molecular orbitals (HOMOs) and (ii) respective lowest unoccupied molecular orbitals (LUMOs) which satisfy the following relational expressions (13) and (14):
• 0 eV<(|LUMO of host material|−|LUMO of organic light emitting material|)≦0.5 eV (13)
• |HOMO of host material|>|HOMO of organic light emitting material| (14)