Organic/inorganic alloys used to improve organic electroluminescent devices
AssigneeInternational Business Machines Corporation
InventorSamuel Clagett Strite
Life of this patent
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Abstract
The above objects have been accomplished by providing an OLED having an organic active (53) region with at least one emission layer (EL). The OLED further comprises at least one organic charge transport layer (52) (either a hole transport layer or an electron transport layer), an anode (51) and a cathode (54). This organic charge transport layer (52) is alloyed by introduction of an inorganic component. If said alloyed charge transport layer (52) is a hole transport layer (HTL), for example, the holes are conducted through it by means of the inorganic constituents with reduced voltage drop or heating.
Claims24
A light emitting device comprising:
- an organic, electroluminescent active region;
- and
- at least one organic charge transport layer for transporting charges from an electrode to said active region,
- wherein said organic charge transport layer includes an inorganic component introduced to form an organic/inorganic alloy material for improved charge transport, and
- the concentration of said inorganic component introduced to form the organic/inorganic alloy material is graded such that the concentration decreases or increases with distance from said active region.
A light emitting device comprising:
- an organic, electroluminescent active region;
- at least one organic charge transport layer for transporting charges from an electrode to said active region;
- and
- an organic buffer layer between the organic charge transport layer and said active region, said organic buffer layer having the purpose of reducing or suppressing quenching by the inorganic component in said organic charge transport layer of the emission layer of said active region,
- wherein said organic charge transport layer includes an inorganic component introduced to form an organic/inorganic alloy material for improved charge transport.
A light emitting device comprising:
- an organic, electroluminescent active region;
- and
- at least one organic charge transport layer for transporting charges from an electrode to said active region,
- wherein said organic charge transport layer includes an inorganic component introduced to form an organic/inorganic alloy material for improved charge transport, and
- the inorganic component is selected from a group consisting of Ge, Si, InAs, InN, InP, GaAs, GaN, and GaP.
Dependencies are inferred from the claim text.