ENHANCEMENT OF PHOTOLUMINESCENCE FROM ORGANIC AND INORGANIC SURFACE PASSIVATED ZnS QUANTUM DOTS

摘要

ZnS quantum dots (QDs) chemically synthesized in PVP stabilizing medium have been coated with Zn(OH)_2, SiO_2 and polystyrene (PS) shells as inorganic and organic passivation agents, to synthesize ZnS/Zn(OH)_2, ZnS/SiO_2 and ZnS/PS QDs. PL properties of inorganically passivated ZnS/Zn(OH)_2 and ZnS/SiO_2 had reported band edge enhancement of 8-10 times, while organically passivated ZnS/PS QDs exhibit tremendous enhancement of band edge emission as much as 10-15 times,. Therefore inorganic and organic coating can passivate trap states of different energies on the surface of ZnS QDs.