Phosphorescent organic light emitting devices
AssigneeThe Trustees of Princeton University
InventorsChihaya Adachi, Marc A. Baldo, Stephen R. Forrest
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Abstract
An organic light emitting device structure having an organic light emitting device (OLED) over a substrate, where the OLED has, for example, an anode, a hole transporting layer (HTL), a first electron transporting layer (ETL) that is doped with a phosphorescent material, a second electron transporting layer (ETL), and a cathode. The OLEDs of the present invention are directed, in particular, to devices that include an emissive layer comprised of an electron transporting host material having a triplet excited state energy level that is higher than the emissive triplet excited state energy level of the phosphorescent dopant material.
Claims22
An organic light emitting device comprising an anode, a cathode and an emissive layer, wherein the emissive layer is located between the anode and the cathode and the emissive layer comprises an electron transporting host material doped with a phosphorescent dopant material, wherein the phosphorescent dopant material has a HOMO energy less than the ionization potential of the electron transporting host material.
An organic light emitting device comprising:
- a substrate;
- an anode layer over said substrate;
- a hole transporting layer over said anode layer;
- a first electron transporting layer over said hole transporting layer, wherein said first electron transporting layer comprises an electron transporting host material doped with a phosphorescent dopant material, wherein the phosphorescent dopant material has a HOMO energy less than the ionization potential of the electron transporting host material;
- a second electron transporting layer over said first electron transporting layer;
- and
- a cathode layer over said second electron transporting layer.
Dependencies are inferred from the claim text.