Quantum dot electronic device and quantum dot transfer printing method

Abstract

A quantum dot electronic device comprises a first encapsulation layer, a first electrode disposed on the first encapsulation layer, a quantum dot pattern disposed on the first electrode, a second electrode disposed on the quantum dot pattern and a second encapsulation layer disposed on the second electrode. The quantum dot pattern may be famed by an intaglio transfer printing method, where the method comprises forming a quantum dot layer on a donor substrate, picking up the quantum dot layer using a stamp, putting the quantum dot layer into contact with an intaglio substrate using the stamp and separating the stamp from the intaglio substrate. Using the quantum dot transfer printing method, a subminiature quantum dot pattern can be transferred at a high transfer rate. Accordingly, a highly integrated quantum dot electronic device exhibiting excellent performance and a high integrated quantum dot light emitting device with an ultrathin film can be realized.

1 - 17 . (canceled) 
     
     
         18 . A quantum dot transfer printing method comprising:
 forming a quantum dot layer on a donor substrate;   picking up the quantum dot layer using a stamp;   putting the quantum dot layer into contact with an intaglio substrate using the stamp; and   separating the stamp from the intaglio substrate.   
     
     
         19 . The quantum dot transfer printing method of  claim 18 , wherein a surface treatment of the donor substrate is performed before forming the quantum dot layer. 
     
     
         20 . The quantum dot transfer printing method of  claim 18 , wherein the quantum dot layer is formed of a colloid nanocrystal substance comprising a quantum dot. 
     
     
         21 . The quantum dot transfer printing method of  claim 18 , wherein the stamp is formed of PDMS (polydimethylsiloxane). 
     
     
         22 . The quantum dot transfer printing method of  claim 18 , wherein a surface energy of the intaglio substrate is greater than a surface energy of the stamp. 
     
     
         23 . The quantum dot transfer printing method of  claim 18 , wherein the intaglio substrate is formed of polymer, glass, organic material or oxide. 
     
     
         24 . The quantum dot transfer printing method of  claim 18 , wherein the intaglio substrate has a recess area that is concavely formed from its surface to its inside. 
     
     
         25 . The quantum dot transfer printing method of  claim 24 , wherein, when the stamp is separated from the intaglio substrate, a portion being in contact with the intaglio substrate in the quantum dot layer remains in the intaglio substrate, and a portion corresponding to the recess area is picked up by the stamp. 
     
     
         26 . The quantum dot transfer printing method of  claim 18 , wherein a uniform pressure is put on the quantum dot layer when putting the quantum dot layer into contact with the intaglio substrate using the stamp.