【摘要】 在氯化锌存在下,通过硫化锌的热氧化制备具有六方纤维锌矿结构的氧化锌绿色荧光粉;研究煅烧温度对荧光粉的激发光谱和发射光谱的影响并测定了荧光粉中硫、氯元素含量。研究结果表明:氯化锌的存在有利于改善ZnO的结晶性和硫、氯元素的共掺杂,形成更多的缺陷,进而大大提高合成产物的荧光发射强度;合成ZnO的荧光光谱表明氯的掺杂不仅可以提高荧光发射强度,而且具有淬灭激子发射的作用,使荧光发射只有1个峰值为506 nm的绿色宽带发射,在800℃时有最强的发射作用,同时还明显强化了电子从价带到带隙缺陷中心跃迁对荧光发射的贡献;该峰的位置随煅烧温度从700℃升高到1 000℃而在378～386 nm变化,与紫光二极管的光输出波长相匹配,有望应用于白光二极管。更多还原

【Abstract】 Classical ZnO green phosphors were synthesized at about 900 ℃ in reductive atmosphere.ZnO green phosphors with hexagonal wurtzite were prepared by thermal oxidization of zinc sulfide and zinc chloride.The effects of oxidation temperature on their photoluminescence spectra were studied.The sulfur and chloride contents were determined.The results show that zinc chloride improves crystallization of zinc oxide,co-doping of sulfur and chloride,formation of defects and luminescent intensity.Since chloride doping quenches the emission of exciton,emission peak is only 506 nm green wide emission.This green emission may contribute to the formation of defects,such as interstitial zinc and oxygen vacancies.The zinc oxide phosphors prepared by calcining zinc sulfide with zinc chloride at 800 ℃ show the highest luminescence intensity,which is explained by the co-doping chloride and sulfur due to their similar radius.Zinc chloride intensifies the transition of electron from valence band to band gap which varies from 378 nm to 386 nm at 700?1 000 ℃.This phosphor can be used for the fabrication of white low emitting diode(LED) since its excitation spectrum matches near UV LED.更多还原