Device for self-assembling semiconductor light-emitting diodes

A device for self-assembling semiconductor light-emitting diodes by placing the semiconductor light-emitting diodes at predetermined positions on a substrate using an electric field and a magnetic field while the substrate is accommodated in an assembly chamber containing a fluid, the device comprising:

• a substrate chuck configured to dispose the substrate at an assembly position over the assembly chamber,
• wherein the substrate chuck includes:
• a substrate support part configured to support the substrate on which an assembly electrode is formed;
• a rotating part connected to the substrate support part and configured to rotatably support the substrate support part;
• and
• a controller electrically connected to the substrate chuck and configured to control driving of the substrate chuck,
• wherein the substrate support part includes micro-holes for at least one of injecting or extracting a gas disposed between the fluid and the substrate, and
• wherein the controller is further configured to control whether at least one of injection and extraction of the gas through the micro-holes according to whether the substrate is raised or lowered.