Organic light-emitting diode, display and illuminating device

An organic light-emitting diode comprising:

• an anode and a cathode which are arranged apart from each other;
• a red and green emissive layer on the anode side and a blue emissive layer on the cathode side, which are arranged apart from each other between the anode and the cathode;
• and
• a spacer layer which is inserted between the red and green emissive layer and the blue emissive layer, and consists of an electron transport material which prevent energy transfer from the blue emissive layer to the red and green emissive layer,
• where the red and green emissive layer contains a host material having hole transportability, a red phosphorescent emitting dopant, and a green phosphorescent emitting dopant, and the blue emissive layer contains a host material having electron transportability and a blue fluorescent emitting dopant,
• the red and green emissive layer contains 20 to 40 wt % of the red phosphorescent emitting dopant and the green phosphorescent emitting dopant in combination,
• a LUMO of the host material having electron transportability in the blue emissive layer and a LUMO of the electron transport material in the spacer layer have nearly equal energy levels,
• a HOMO-LUMO energy gap of the electron transport material in the spacer layer is larger than a HOMO-LUMO energy gap of the blue fluorescent emitting dopant, and
• a thickness of the spacer layer is 3 to 5 nm, and
• a T1 energy of the blue fluorescent emitting dopant is lower than a T1 enerqy of the electron transport material layer of the spacer layer.