Buffer layers for organic electroluminescent devices and methods of manufacture and use

Abstract

Organic electroluminescent device can be formed with multiple layers including an electrode, an emission layer, and a buffer layer. The emission layer includes a light emitting material. The buffer layer is disposed between and in electrical communication with the electrode and the emission layer and includes a triarylamine hole transport material and an electron acceptor material. The buffer layer optionally includes one or more of a) a polymeric binder, b) a color converting material, and c) light scattering particles. The buffer layer can also be formed using a polymeric hole transport material having a plurality of triarylamine moieties.

1 - 4 . (canceled) 
     
     
         5 . A method of making an electroluminescent device comprising:
 forming an electrode on a receptor substrate;   forming a buffer layer over the electrode, the buffer layer comprising a triarylamine hole transport material, and an electron acceptor material;   forming a transfer layer on a donor substrate, wherein the transfer layer comprises a plurality of individual sublayers and wherein at least one of the sublayers comprises an emission layer; and   selectively thermally transferring a portion of the transfer layer from the donor to the buffer layer,   wherein the electrode, buffer layer, and transfer layer are in electrical communication, and the emission layer comprises a light emitting material,   wherein the buffer layer further comprises at least one of a polymeric binder and a crosslinked polymeric binder, and   wherein the polymeric binder or the crosslinked polymeric binder is electroactive.   
     
     
         6 . A method of making an electroluminescent device comprising:
 forming an electrode on a receptor substrate;   forming a buffer layer over the electrode, the buffer layer comprising a triarylamine hole transport material, and an electron acceptor material;   forming a transfer layer on a donor substrate, wherein the transfer layer comprises a plurality of individual sublayers and wherein at least one of the sublayers comprises an emission layer; and   selectively thermally transferring a portion of the transfer layer from the donor to the buffer layer,   wherein the electrode, buffer layer, and transfer layer are in electrical communication, and the emission layer comprises a light emitting material,   wherein the buffer layer further comprises at least one of a polymeric binder and a crosslinked polymeric binder, and   wherein the polymeric binder or the crosslinked polymeric binder is electrically inert.   
     
     
         7 - 9 . (canceled) 
     
     
         10 . A method of making an electroluminescent device comprising:
 forming an electrode on a receptor substrate;   forming a transfer layer on a donor substrate, wherein the transfer layer comprises first and second individual sublayers, wherein the first sublayer comprises a buffer layer, the buffer layer comprising a triarylamine hole transport material and an electron acceptor material, and wherein the second sublayer comprises an emission layer; and   selectively thermally transferring a portion of the transfer layer onto the receptor substrate, and in electrical communication with the electrode,   wherein the electrode, first sublayer, and second sublayer are in electrical communication, and the emission layer comprises a light emitting material.   
     
     
         11 . The method of  claim 10 , where the second sublayer further comprises at least one of a hole transport layer, a hole blocking layer, an electron transport layer, an electron blocking layer, an electron injection layer and a second electrode layer. 
     
     
         12 . The method of  claim 10 , wherein the buffer layer further comprises at least one of a polymeric binder and a crosslinked polymeric binder. 
     
     
         13 . The method of  claim 12 , wherein the polymeric binder or the crosslinked polymeric binder is electroactive. 
     
     
         14 . The method of  claim 12 , wherein the polymeric binder or the crosslinked polymeric binder is electrically inert. 
     
     
         15 . The method of  claim 10 , wherein the buffer layer further comprises a color converting material.