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US 9,356,242 B2Granted
Organic electroluminescent device
AssigneeMerck Patent GmbH
InventorsJoachim Kaiser, Edgar Boehm
Life of this patent
Estimating the term…
Abstract
An organic electroluminescent device that includes at least two phosphorescent emitting layers, where phosphorescent emitter layer 1 comprises a hole-conducting matrix material and two different phosphorescent emitters, and phosphorescent emitter layer 2 comprises an electron-conducting matrix material and a phosphorescent emitter.
Claims19
An organic electroluminescent device comprising, in this sequence:
- anode, phosphorescent emitter layer 1, phosphorescent emitter layer 2, which is in direct contact with said phosphorescent emitter layer 1, a charge-generation layer, blue-emitting layer, and cathode, wherein said phosphorescent emitter layer 1 comprises a hole-conducting matrix material and two different phosphorescent emitters wherein one phosphorescent emitter is a shorter-wave phosphorescent emitter and one phosphorescent emitter is a longer-wave phosphorescent emitter, and said phosphorescent emitter layer 2 comprises an electron-conducting matrix material and a phosphorescent emitter, wherein the phosphorescent emitter of emitter layer 2 has the same emission maximum as the shorter-wave phosphorescent emitter of emitter layer 1, wherein said device is a white-emitting, tandem organic electroluminescent device.
Dependencies are inferred from the claim text.