Abstract
ZnSe precursors were prepared by a solvothermal method at 180°C without any surface-active agents. ZnSe quantum dots and nanoparticles were obtained by annealing the precursors at 300°C for 2h in argon atmosphere. The ZnSe quantum dots were about 3.5nm, while the ZnSe nanoparticles were about 21nm, as observed using TEM. The growth mechanisms for the two samples were discussed; this proved that the high coordination ability of ethylenediamine to zinc played an important role in the final phase of the products. The ZnSe quantum dots with the wurtzite structure exhibited a strong near band-edge emission (NBE) peak centered at 422nm, which was blue-shifted in comparison to that of the bulk ZnSe, which was mainly caused by the quantum confinement effect. However, the zinc blende ZnSe nanoparticles exhibited a near-band-edge luminescence peak centered at 472nm.
Published Version
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