METHOD FOR PURIFYING ORGANIC MATERIALS USED FOR ORGANIC ELECTROLUMINESCENT ELEMENT TO EFFECTIVELY REMOVE FREE METAL IONS, THEREBY IMPROVING PROPERTIES AND SERVICE LIFE OF THE RESULTED ELEMENT

摘要

PURPOSE: A method for purifying organic materials with ultra-high purity used for organic electroluminescent(OEL) element is provided to effectively remove free metal ions, thereby reducing black spots generated during OEL manufacturing and improving electric and optical properties and the service life of the resulted element. CONSTITUTION: The method for purifying organic materials used for OEL element comprises contacting the organic materials used for OEL element with a solution of a chelating agent and zeolite, wherein the chelating agent is selected from DTPA (diethylenetriaminepentaacetic acid), EDTA (ethylenediaminetetraacetic acid), NTA (nitrilotriacetic acid), TTHA (triethylenetetraaminehexaacetic acid), HIDA (dimethyliminodiacetic acid), gluconic acid soda and Dimercaprol (2,3-dimercapto-1-propanol).