Abstract: A light emitting element includes: a light emitting stack pattern including a first semiconductor layer, an active layer, and a second semiconductor layer that are sequentially stacked along one direction; and an insulating film surrounding an outer surface of at least one of the first semiconductor layer, the active layer, and the second semiconductor layer. The insulating film including a zinc oxide (ZnO) thin film layer.

Abstract: A light-emitting element includes a first semiconductor layer doped to have a first polarity, a second semiconductor layer doped to have a second polarity different from the first polarity, a light-emitting layer disposed between the first and second semiconductor layers, a shell layer formed on side surfaces of the first semiconductor layer, the light-emitting layer, and the second semiconductor layer, the shell layer including a divalent metal element, and an insulating film covering an outer surface of the shell layer and surrounding the side surface of the light-emitting layer.

Abstract: A transformable wheel module is disclosed. The transformable wheel module comprises: a plurality of lobes; and a mode switching unit for switching modes between a first traveling mode in which the lobes are coupled in a ring shape and a second traveling mode in which the lobes are separated from each other, wherein the mode switching unit can include: a first rotary link; a second rotary link positioned on the same rotational axis as the first rotary link; a plurality of first connecting links for individually connecting the first rotary link and the lobes; a plurality of second connecting links for individually connecting the second rotary link and the lobes; a first driving motor for rotating the first rotary link; and a second driving motor for rotating the second rotary link.