Optical element, light-emitting device having the same and method of manufacturing the same

摘要

An optical element includes a light-transmitting structure (130) and a first reflection-prevention layer (150). The light-transmitting structure has a first surface (131) and a second surface facing (133) the first surface (131). The first reflection-prevention layer (150) includes a plurality of first light-refractive index buffering particles deposited on the first surface (131) such as the concentration of the particles decreases as the distance from the first surface (131) increases. The first reflection-prevention layer (150) decreases the variation of a light-refractive index from the light-transmitting structure (130) to an air layer to decrease the light reflectance of the first surface (131). Therefore, the light transmittance of the light-transmitting structure (130) is increased due to the reflection-prevention layer (150) formed on a surface of the light-transmitting structure (130), so that luminance may be enhanced. Moreover, the reflection-prevention layer (150) may enhance the resistance of the light-transmitting structure to external impacts.