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Schematic and luminescence photographs of Mobile ultraviolet light sources (Mobile-UV). (a). Schematic and application fields of the Mobile-UV. (b). The working principle of freestanding rotary (FR) TENG. (c). The detail photograph (scale bar, 10 mm) and luminescence patterned (scale bar, 20 mm) of Mobile-UV tube directly driven by FR-TENG, no Photoshop (NIKON D700 @ 56 mm, ISO 640, f/6.3, 2 s exposure).
