Electroluminescent devices with electrode protection

Abstract

A method of manufacturing an electroluminescent device which has an anode and a cathode and arranged between the anode and the cathode a light emissive layer, also includes an anode protection layer which protects the anode against the effects of converting a precursor polymer to a semiconductive conjugated polymer which constitutes the light emissive layer. This has been found to increase the brightness and half-life of devices.

1 - 25 . (canceled)  
   
   
       26 . An organic electroluminescent device comprising: 
 an anode formed of a positive charge carrier injecting material;    a cathode formed of a negative charge carrier injecting material;    a light emissive layer located between the anode and the cathode; and    located between the anode and the light-emissive layer a layer comprising an inorganic metal compound exhibiting a hole transport mobililty.    
   
   
       27 . A device as claimed in  claim 26 , wherein the inorganic metal compound is an inorganic metal oxide.  
   
   
       28 . An electroluminescent device comprising: 
 an anode formed of a positive charge carrier injecting material;    a cathode formed of a negative charge carrier injecting material;    a light-emissive layer located between the anode and the cathode; and    located between the anode and the light-emissive layer a layer comprising a non-stoichiometric inorganic metal compound.    
   
   
       29 . A device as claimed in  claim 28  wherein the non-stoichiometric inorganic metal compound is a non-stoichiometric metal oxide.