Method for making organic light emitting diode

A method for making an organic light emitting diode, the method comprising:

• providing a first carbon nanotube composite structure having a first surface and a second surface opposite to the first surface, wherein the first carbon nanotube composite structure comprises a polymer and a plurality of first carbon nanotubes dispersed in the polymer, and a length direction of the plurality of first carbon nanotubes is from the first surface to the second surface;
• providing a preform structure comprising a support body, an anode electrode, a hole transport layer, and an organic light emitting layer stacked on each other in that order;
• locating the preform structure on the first surface, wherein the first surface is in direct contact with the organic light emitting layer;
• and
• forming a cathode electrode on the second surface.