Organic electroluminescent device

The invention provides an organic electroluminescent device having high luminous efficiency, being able to drive at a low voltage and being excellent in driving durability including, between an anode and cathode, a luminescent layer containing a luminescent material, an electron-transport layer (ETL...

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1. Verfasser: TOBISE MANABU
Format: Patent
Sprache:eng
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Zusammenfassung:The invention provides an organic electroluminescent device having high luminous efficiency, being able to drive at a low voltage and being excellent in driving durability including, between an anode and cathode, a luminescent layer containing a luminescent material, an electron-transport layer (ETL1) and an organic thin film layer (ETL2) in this order from the anode side, wherein the organic thin film layer (ETL2) contains an electron-transport material and has a thickness of 0.01 to 3 nm, and the ratio (ETL1/ETL2) of the thickness of the electron-transport layer (ETL1) to the thickness of the organic thin film layer (ETL2) is in the range of 5 to 500.