US2004004433A1PendingUtilityA1

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

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Assignee: 3M INNOVATIVE PROPERTIES COPriority: Jun 26, 2002Filed: Jun 26, 2002Published: Jan 8, 2004
Est. expiryJun 26, 2022(expired)· nominal 20-yr term from priority
Inventors:Sergey LamanskyManoj NirmalFred B. MccormickRalph R. RobertsJohn P. BaetzoldTodd D. Jones
H10K 50/854H10K 50/17H05B 33/22H05B 33/10H10K 85/649H10K 85/631H10K 85/151H10K 85/111H10K 50/155H10K 50/125H10K 71/18H10K 85/141H10K 85/611H10K 85/615
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Claims

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.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . An electroluminescent device comprising: 
 an electrode;    an emission layer comprising a light emitting material; and    a buffer layer disposed between and in electrical communication with the electrode and the emission layer, wherein the buffer layer comprises a polymeric binder, a triarylamine hole transport material disposed in the polymeric binder, and an electron acceptor material disposed in the polymeric binder.    
     
     
         2 . The electroluminescent device of  claim 1 , wherein the buffer layer further comprises a color converting material disposed in the polymeric binder.  
     
     
         3 . The electroluminescent device of  claim 1 , wherein the buffer layer further comprises a plurality of light scattering particles disposed in the polymeric binder.  
     
     
         4 . The electroluminescent device of  claim 1 , wherein the triarylamine hole transport material comprises a polymer.  
     
     
         5 . The electroluminescent device of  claim 1 , wherein the polymeric binder of the buffer layer is crosslinked.  
     
     
         6 . The electroluminescent device of  claim 1 , wherein the buffer layer further comprises crosslinking agents.  
     
     
         7 . The electroluminescent device of  claim 1 , wherein the polymeric binder comprises a charge transporting polymer.  
     
     
         8 . The electroluminescent device of  claim 1 , wherein the polymeric binder comprises ionic moieties.  
     
     
         9 . The electroluminescent device of  claim 1 , wherein the electrode is an anode and the electroluminescent device further comprises a cathode in electrical communication with the emission layer.  
     
     
         10 . The electroluminescent device of  claim 1 , further comprising a hole transport layer disposed between the buffer layer and the emission layer.  
     
     
         11 . An electroluminescent device comprising: 
 an electrode;    an emission layer comprising a light emitting material; and    a buffer layer disposed between and in electrical communication with the electrode and the emission layer, wherein the buffer layer comprises (a) a polymeric hole transport material comprising a plurality of triarylamine moieties and (b) an electron acceptor material disposed in the polymeric hole transport material.    
     
     
         12 . The electroluminescent device of  claim 11 , wherein the buffer layer further comprises a color converting material disposed in the polymeric binder.  
     
     
         13 . The electroluminescent device of  claim 11 , wherein the buffer layer further comprises a plurality of light scattering particles disposed in the polymeric binder.  
     
     
         14 . The electroluminescent device of  claim 11 , wherein the polymeric hole transport material comprises a backbone with at least a portion of the plurality of triarylamine moieties disposed in the backbone.  
     
     
         15 . The electroluminescent device of  claim 11 , wherein the polymeric hole transport material comprises a backbone wherein the plurality of triarylamine moieties are pendent groups extending from the backbone.  
     
     
         16 . The electroluminescent device of  claim 11 , wherein the polymeric hole transport material of the buffer layer is crosslinked.  
     
     
         17 . The electroluminescent device of  claim 1 , wherein the buffer layer further comprises crosslinking agents.  
     
     
         18 . An electroluminescent device comprising: 
 an electrode;    an emission layer comprising a light emitting material; and    a buffer layer disposed between and in electrical communication with the electrode and the emission layer, wherein the buffer layer comprises a triarylamine hole transport material, a color converting material disposed in the triarylamine hole transport material, and an electron acceptor material disposed in the triarylamine hole transport material.    
     
     
         19 . The electroluminescent device of  claim 18 , wherein the buffer layer further comprises a plurality of light scattering particles disposed in the polymeric binder.  
     
     
         20 . The electroluminescent device of  claim 18 , wherein the triarylamine hole transport material is a polymer.  
     
     
         21 . The electroluminescent device of  claim 18 , wherein the color converting material comprises a dye material.  
     
     
         22 . The electroluminescent device of  claim 18 , wherein the color converting material is configured and arranged to absorb light generated by the light emitting material of the emission layer.  
     
     
         23 . The electroluminescent device of  claim 18 , wherein the color converting material is configured and arranged to reemit light after absorbing light generated by the light emitting material of the emission layer.  
     
     
         24 . The electroluminescent device of  claim 18 , wherein the color converting material comprises an inorganic or organometallic material.  
     
     
         25 . An electroluminescent device comprising: 
 an electrode;    an emission layer comprising a light emitting material; and    a buffer layer disposed between and in electrical communication with the electrode and the emission layer, wherein the buffer layer comprises a triarylamine hole transport material, a plurality of light scattering particles disposed in the triarylamine hole transport material, and an electron acceptor material disposed in the triarylamine hole transport material.    
     
     
         26 . The electroluminescent device of  claim 25 , wherein the plurality of light scattering electroluminescent devices comprise an inorganic material.  
     
     
         27 . A method of making an electroluminescent device comprising: 
 forming an electrode;    coating a buffer layer from solution over the electrode, the buffer layer comprising a polymeric binder, a triarylamine hole transport material, and an electron acceptor material; and    disposing a emission layer over the buffer layer, wherein the electrode, buffer layer, and emission layer are in electrical communication and the emission layer comprises a light emitting material.    
     
     
         28 . The method of  claim 27 , further comprising disposing a hole transport layer over the buffer layer prior to disposing the emission layer over the buffer layer.  
     
     
         29 . A method of making an electroluminescent device comprising: 
 forming a hole injection transfer layer on a donor substrate, the buffer layer comprising a triarylamine hole transport material and an electron acceptor material;    forming an electrode on a receptor substrate;    selectively thermally transferring a portion of the buffer layer onto the receptor substrate and in electrical communication with the electrode; and    disposing an emission layer over the portion of the buffer layer that was selectively thermally transferred onto the receptor substrate.

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