【摘要】 文章采用熔盐法生长ZnO颗粒,研究了颗粒生长机制以及合成条件对于颗粒晶体质量和光学性能的影响。研究发现:熔盐法生长的ZnO颗粒为单晶,具有六角纤锌矿结构,其生长机制由Ostwald熟化生长和取向联结生长2种机制组成;此外,煅烧条件对于颗粒的晶体质量和发光性能均具有很大影响;Ar气负压条件下的高温煅烧有助于提高颗粒整体的结晶质量,但同时也会在颗粒内引入氧空位缺陷,从而使其具有较强的绿光发射性能;而ZnO颗粒在空气常压条件下煅烧虽然可以减少氧空位缺陷,但是其较快的生长速率却会在颗粒内引入应力和其他缺陷,从而降低颗粒的晶体质量,造成其发光性能很弱。更多还原

【Abstract】 ZnO particles were prepared by the molten salt method.Their growth mechanism and the influences of the preparation conditions on their crystal quality and optical properties were studied in detail.It was found that the ZnO particles prepared were single crystals with a hexagonal wurtzite structure.Their growth mechanism comprises Ostwald ripening and oriented attachment.Moreover,the calcining condition had great influence on both the crystal quality and the photoluminescence property of the particles.High-crystal-quality ZnO particles with some oxygen vacancy defects,which possessed strong green emissions,could be prepared by being calcined in the Ar atmosphere with negative pressure at high temperatures.Although the density of the oxygen vacancy defect could be decreased by calcining the particles in the air ambience with normal atmospheric pressure,the stress and many other defects were introduced into the particles due to their rapid growth,which caused the degradation of the grain’s crystalline quality and thus resulted in a poor photoluminescence property.更多还原