The invention relates to a process of ironing fabrics. The mold includes an inlet plate, middle plates and an outlet plate which are connected with each other in series by columniform pin, and then side baffles are added to mount on a base with the aid of bolts. Light emitted from the light-emitting layer is reflected by the reflecting surface, so that the reflected light emerges from side surfaces of the light-emitting element to the outside without passing through the semiconductor layers. Other features are also provided. Adjustment of the translation time may be achieved by modifying the rotational speed of the associated drum. Advantageously, improvements in hole carrier mobility of approximately 50% can be obtained by orienting the structure’s channel in a plane such that the electrical current flow is in the <110> direction.