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In the nature world,we can get very material about photoluminescence(PL).Damselfly Ischnura senegalensis(Rambur,1842)was the first found a strong emission of PL from the particular part-body portions.For example,the eight and night abdominal segment of the tail was stimulated under the ultraviolet lights.Its wavelengths of color were enhanced and changed from the PL emissions.Therefore,this process of mature mating could get easier to distinguish females from males.Because they transform their wavelength,its mechanism rises their proportion in reproduction.In other hands,this ability also reduces intrasexual to promoting that damselflies can breed its spawn safely.