Quantum-dot light emitting diode, method of fabricating the quantum-dot light emitting diode and quantum-dot light emitting display device

A method of fabricating a quantum-dot (QD) light emitting diode, comprising:

• forming a first or second electrode;
• forming a light emitting layer on the first or second electrode corresponding to a center of the first or second electrode;
• and
• forming a second or first electrode facing the first or second electrode on the light emitting layer,
• wherein the forming the light emitting layer further comprises:
• forming a hole auxiliary layer corresponding to the center of the first electrode or forming an electron auxiliary layer corresponding to the center of the second electrode;
• coating a QD solution and drying the coated QD solution to form a layer having a plurality of QDs on the hole auxiliary layer or electron auxiliary layer, each QD including a core, a shell surrounding the core and a ligand formed on an entire surface of the shell;
• removing the ligand at a first side the shell so as to form a QD light emitting material layer (EML);
• and
• forming an electron or hole auxiliary layer on the QD EML,
• wherein one of the electron auxiliary layer and the hole auxiliary layer contacts the shell, and the other of the electron auxiliary layer and the hole auxiliary layer contacts the ligand at a second side of the shell.

A QD light emitting display device, comprising:

• a substrate;
• a QD light emitting diode disposed over the substrate, the QD light emitting diode comprising:
• first and second electrodes facing each other;
• a QD emitting material layer between the first and second electrodes and including a QD;
• a first charge auxiliary layer between the first electrode and the QD emitting material layer;
• and
• a second charge auxiliary layer between the QD emitting material layer and the second electrode;
• and
• a thin film transistor between the substrate and the QD light emitting diode and connected to the QD light emitting diode,
• wherein the QD includes a core, a shell surrounding the core and a ligand contacting a portion of the shell, and
• wherein a distance between the shell and the first charge auxiliary layer is greater than a distance between the shell and the second charge auxiliary layer.