Organic electroluminescent device structure and manufacturing for the same

Abstract

An organic electroluminescent device structure and manufacturing method for the same are provided. Surfaces of an anode, an organic electroluminescent structure and a cathode all have arc structures undulating periodically to avoid the total reflection in propagating an exit light to the substrate, increasing the light efficiency. Utilizing a PEDOT:PSS thin film as a material for the anode to replace an ITO material reduces the cost. The manufacturing method utilizes a wet coating process to form the PEDOT:PSS thin film as the anode so as to reduce the cost. Utilizing a transfer-printing method to pattern the PEDOT:PSS thin film to form an arc structure undulating periodically on the PEDOT:PSS thin film (the anode) to avoid the total reflection inside the organic electroluminescent device such that most light can be propagated out from the substrate. Accordingly, a light efficiency of the bottom-emitting type organic electroluminescent device is increased.

What is claimed is: 
     
         1 . An organic electroluminescent device structure, comprising: a substrate, an anode disposed on the substrate, an organic electroluminescent structure disposed on the anode, and a cathode disposed on the organic electroluminescent structure;
 wherein a material of the anode is a PEDOT:PSS thin film, and a surface of each of the anode, the organic electroluminescent structure and the cathode has an arc structure undulating periodically;   wherein the substrate has optical transparency and a refractive index of the PEDOT:PSS thin film is less than or equal to a refractive index of the substrate;   wherein a surface of each of the organic electroluminescent structure and the cathode has an arc structure undulating periodically;   wherein the organic electroluminescent structure comprises a hole injection layer, a hole transport layer and an organic light-emitting layer, and the hole injection layer and the hole transport layer are disposed between the anode and the organic light-emitting layer; and   wherein an interface between the anode and the hole injection layer and the hole transport layer also has an arc structure undulating periodically.   
     
     
         2 . The organic electroluminescent device structure according to  claim 1 , wherein the arc structure undulating periodically is a wavy arc shape. 
     
     
         3 . The organic electroluminescent device structure according to  claim 1 , wherein the arc structure undulating periodically is formed by multiple projected semicircles and multiple depressed semicircles connected alternately. 
     
     
         4 . The organic electroluminescent device structure according to  claim 1 , wherein the cathode is made of a metal material or an alloy material.