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US 6,663,985 B2Granted
Organic electroluminescent device with improved long-term stability
AssigneeLG Electronics Inc.
InventorsJong Geun Yoon, Myung Seop Kim, Hyoung Yun Oh, Sung Tae Kim
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Abstract
An organic electroluminescent device with improved long-term stability, comprising either a dual layer of a layer I and a layer II or a mixture of the two layers between an EL multilayer and a second electrode, the layer II being made of at least one alkali metal, alkaline earth metal, or compound thereof, the layer I being formed of at least one material selected from those having chemical formula I and chemical formula II as shown below.
Claims10
An organic electroluminescent (EL) device comprising:
- at least one organic EL multilayer between a top side of a first electrode and a bottom side of a second electrode, and a layer I positioned between said bottom side of said second electrode and a top side of said organic EL multilayer, said layer I including at least one first material from the group consisting of compounds of chemical formula I:
- where:
- each of R1 to R4 is independently hydrogen, an alkyl or alkoxy group having from 1 to 5 carbon atoms, aryl, aryloxy or a halogen, or at least one among pairs of adjacent substituents of R1 through R4 form a five or six- numbered conjugated cyclic ring;
- and,
- A each independently denotes hydrogen, an alkyl group having from 1 to 5 carbon atoms, or aryl;
- and further comprising a layer II comprising at least one second material selected from the group consisting of an alkali metal, an alkaline earth metal, and a compound thereof wherein said layer II is positioned between a bottom side of said layer I and a top side of said EL multilayer or wherein said layer II is positioned between a bottom side of said second electrode and a top side of said layer I, wherein the at least one organic EL multilayer comprises a luminescent layer and one or more of a hole injecting layer, a hole transporting layer, an electron transporting layer or an electron injecting layer.
3 more elements
An organic electroluminescent (EL) device, comprising:
- at least one organic EL multilayer between a first electrode and a second electrode;
- a mixed layer positioned between said second electrode and said at least one organic EL multilayer, wherein said mixed layer comprises at least one first material from the group consisting of compounds of chemical formula I:
- where:
- each of R1 to R4 is independently hydrogen, an alkyl or alkoxy group having from 1 to 5 carbon atoms, aryl, aryloxy or a halogen, or at least one among pairs of adjacent substituents of R1 through R4 form a five or six- numbered conjugated cyclic ring;
- and,
- A each independently denotes hydrogen, an alkyl group having from 1 to 5 carbon atoms or aryl;
- and
- at least one second material selected from the group consisting of an alkali metal, an alkaline earth metal and a compound thereof, wherein the at least one first material and the at least one second material form a concentration gradient in the thickness direction of the mixed layer.
5 more elements
Dependencies are inferred from the claim text.