A visible, white and dazzling radiation was observed at room temperature when the nanostructured materials in vacuum were irradiated by many kinds of semiconductor laser diodes (LDs). The photoluminescence from different nano-materials have common property as well as individual characteristics. Some nanostructured semiconductor can be stimulated to emit an ultraviolet radiation besides visible light A normal InGaAs LD operating at 980 nm is a typical example, which possesses a strong deep UV emission at room temperature.