Optical structural body and light-emitting device

The invention discloses a light-emitting device which comprises a substrate, a light-emitting component and a first optical structural body. The light-emitting component is arranged on the upper surface of the substrate. The first optical structural body is arranged on the light-emitting component and comprises multiple first nanometer minute structures and multiple first quantum dot units. The first quantum dot units are arranged in the first nanometer minute structures and used for being stimulated by first color light generated by light-emitting component to generate second color light different from the first color light.