In recent years,materials and devices operating in the ultraviolet (UV) regime have attracted significant attention and therefore experienced rapid development.On the one hand,following the thriving advancement of GaN-based blue and white LEDs,which have brought a revolution in lighting sources,various groups are expanding their research work in Al(Ga)N materials and Al(Ga)N-based UV devices with the aim to explore more potential applications in shorter wavelength regime of group Ⅲ-nitrides.While on the other hand,some binary alloys such as SiC,Ga203,BN,etc,whose bandgaps lie in the UV region,have been accomplished for a variety of applications.The development of UV materials laid the foundation for UV devices.Nevertheless,each material has its own benefits and constraints.More efforts should be devoted to overcoming the obstacles and challenges,in order to improve the material quality and devices performance.