Semiconducting hole injection materials for organic light emitting devices
AssigneeCanon Kabushiki Kaisha
InventorsBing R. Hsieh, Xiao-Chang Li, Alan Sellinger
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Abstract
The invention is directed to oxidized charge transport materials having hole transport capability in organic light emitting device (OLEDs). A charge transport compound including more than two triarylamine groups, or including at least one triarylamine group and at least one fluorene group, is partly complexed with an oxidant, such as a Lewis acid, preferably present in an amount between 0.2 and 20 percent by weight. The resulting charge transport materials exhibit good hole transport characteristics and film forming properties.
Claims16
An oxidized charge transport material formed substantially without a polymeric binder, having hole transport capability in an organic light emitting device, comprising
- a charge transport compound including more than two triarylamine groups, or including at least one triarylamine group and at least one fluorene group, and
- an oxidant complexed with said charge transport compound, wherein
- a portion of said charge transport compound is not complexed with said oxidant.
A charge transport material capable of being formed into uniform thin film having hole injection capability in an organic light emitting device, comprising a charge transport compound selected from the group consisting of oligoarylamines, oligothiophenes, tetraselenotetracenes, mono- and oligo-tetrathiafulvalenes, oligo-tetraselenafulvalenes and oligo-metallocenes oxidized with a Lewis acid.
An organic light emitting device comprising an anode, a cathode and an emissive layer between the anode and the cathode, and between the anode and the emissive layer, a hole injection layer formed without a polymeric binder and comprising a charge transport compound including more than two triarylamine groups, or including at least one triarylamine group and at least one fluorene group, complexed with an oxidant, wherein a portion of said charge transport compound is not complexed with said oxidant.
Dependencies are inferred from the claim text.