ZnO nanoparticles (NPs) have attracted increasing attention recently because it is nontoxic, chemically stable towards air, and inexpensive luminescent material instead of the GaN- based structures. However, in general, two emission peaks appear in the ultraviolet and visible region in the photoluminescence spectra of ZnO NPs because of trapping with surface states or a lattice defect. Therefore, in this study, we tried to control the defect of ZnO NPs to obtain pure band-edge emission peak, as well as to keep the dispersivity as colloidal solution. At first, we applied high temperature (300°C) to synthesize ZnO NPs, however, short reaction time (<30s) was not enough for obtaining pure-band-edge emission ZnO NPs, whereas long time (>120s) reaction made ZnO NPs to lose its colloidal stability and aggregated to decrease their PL intensity significantly. So, low synthesis temperature (200°C) was hardly obtaining emission peak even after 1h of heating. Therefore, it was tried to divide synthesis into two steps to generate ZnO NPs at high temperature (300°C) and to heal the defect with the dispersing quality keeping at low temperature (200°C). As a result, we succeed to suppress the defects of ZnO NPs and obtain the well-dispersed pure band-edge emission ZnO NPs.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Issue number||SYMPOSIUM 5|
|Publication status||Published - Jan 1 2011|
|Event||3rd International Congress on Ceramics, ICC 2011 - Osaka, Japan|
Duration: Nov 14 2010 → Nov 18 2010
All Science Journal Classification (ASJC) codes
- Materials Science(all)