Large scale manufacturing of ZnO nanoparticles at room temperature was reported.The as-synthesized particles and their optical performance were characterized by XRD,TEM,AFM,PL,UV-vis absorption spectra and Raman spectra.The synthesized ZnO nano-particles,the size of which is about 60 nm,have good crystal structure,and are free of impurity.Room temperature PL shows an ultraviolet band emission peaked at around 390 nm corresponding to the near band-edge emission and a green band peaked at around 510 nm.The mo...