Ink for organic light emitting diodes

Abstract

A method of depositing a cathode on an organic light emitting diode (OLED) stack is provided. The method includes providing a substrate having at least a partial organic light emitting diode (OLED) stack disposed on a surface of the substrate. The method further includes depositing, on top of the partial OLED stack, a solution comprising a metal compound. The method further includes forming a conductive solid layer from the metal compound in the solution to form a cathode for the partial OLED stack.

1 - 25 . (canceled) 
     
     
         26 . An ink for depositing an electrode, comprising:
 an aliphatic solvent; and   a metal compound suspended in the aliphatic solvent, wherein the ink is suitable for use in depositing an electrode in an organic light emitting diode (OLED).   
     
     
         27 . The ink of  claim 26 , wherein the electrode is a cathode. 
     
     
         28 . The ink of  claim 26 , wherein ink is compatible with deposition on top of a partial OLED stack includes, in order of proximity to a substrate:
 an anode;   a hole injection layer;   a hole transport layer;   a light emission layer;   an electron transport layer; and   an electron injection layer.   
     
     
         29 . The ink of  claim 28 , wherein the anode is a transparent conductive layer. 
     
     
         30 . The ink of  claim 28 , wherein the partial OLED stack is part of a bottom-emitting OLED stack. 
     
     
         31 . The ink of  claim 28 , wherein the partial OLED stack includes an anode comprising a material other than indium tin oxide (ITO). 
     
     
         32 . The ink of  claim 26 , wherein the metal compound comprises a silver (Ag) compound or an aluminum (A1) compound. 
     
     
         33 . The ink of  claim 26 , wherein the electrode is reflective. 
     
     
         34 . The ink of  claim 26 , wherein the electrode has a conductivity between 0.001-1.0Ω/□/mil. 
     
     
         35 . The ink of  claim 26 , wherein the electrode covers a contiguous area on the substrate that is at least 1 cm 2 . 
     
     
         36 . The ink of  claim 26 , wherein the ink is compatible with a solution-based processing technique. 
     
     
         37 . The ink of  claim 26 , wherein the ink is compatible with roll-to-roll processing. 
     
     
         38 . The ink of  claim 26 , wherein the metal compound comprises conductive particles functionalized to be soluble in the aliphatic solvent.