以ZrOCl_2为添加剂煅烧ZnS合成ZnO绿色荧光粉

Synthesis of ZnO Green Phosphor by Calcining ZnS with ZrOCl_2 as Additive

研究以氯氧化锆为添加剂的硫化锌热氧化法合成ZnO绿色荧光粉的过程。XRD衍射图谱表明合成荧光粉的主晶相为六方纤锌矿ZnO,并有少量残存的ZnS相存在。荧光发射光谱在350nm或374nm光激发下只呈现出在510nm左右的绿色峰,氯氧化锆添加可大大提高产物的荧光发射强度,而氧化锆则不能。荧光粉中硫和氯的含量与荧光强度随煅烧温度的关系类似,说明氯离子对合成ZnO的绿色发射有直接贡献。该荧光粉的激发波长与近紫外LED的光输出波长相匹配,可用于白光LED荧光的转换材料。

ZnO green phosphor preparation process by the thermal oxidation of zinc sulfide with zirconium oxychloride as additive is investigated. It is found by the X-ray diffraction patterns that the principal crystal phase of the product is the wurtzite ZnO and a little of ZnS as well as ZrO2. In the photoluminescence spectra of the phosphor, only one green peak appears at around 510nm under excitation of 350 nm or 374nm radiations, and the emission intensity can be greatly increased by the additive of zirconium oxychloride, but not by the additive of zirconium oxide. Furthermore, the temperature dependences of luminescent intensity and the contents of sulfur and chloride are similar. These facts show that chloride ion has the direct contribution to enhancing the luminescent intensity of ZnO. The ZnO phosphor product can be used as the luminescent converter material of white LED due to its excitation wavelength matching the output light wavelength of near ultrovoilet LED well.