CaS:TmF_3粉末蓝色发光材料的制备

Preparation of CaS:TmF_3 Phosphor

本文研究了S＋H2，S；H2S＋H2；H2S，S＋H2S和S＋H2S十H2等不同气氛下用CaCO3硫化法制备的CaS粉末中的CaSO4和CaO杂质相的含量与反应气氛和反应方法的关系．X射线衍射分析表明，CaSO4和CaO杂质相的含量与反应气氛有密切的联系．CaS粉末中F＋中心（带两个正电荷的S空位俘获一个电子）的数量与反应原材料和CaSO4和CaO杂质相的含量有关．光致发光的激发光谱表明，在CaS：TmF3发光粉末中存在由Tm3＋离子发光中心向F＋中心的能量传递，CaS粉末大量的F＋中心的存在不利于CaS：TmF3蓝色发光效率的提高．通过对不同气氛下制备的CaS粉末F＋中心、CaSO4和CaO杂质相的含量进行分析和比较，找到了制备适用于CaS：TmF3发光材料的CaS粉末的最佳方法．

This paper studied the preparation of CaS powders by sulfurizing CaCO3 in different atmosphere such as S+N2, S+air, H2S+H2, H2S, S+H2S and S+H2S+H2 with different reactivemethods. The formation of impurity phases such as CaSO4 and CaO depends strongly on thesulfurizing atmospheres. The amount of F+ vacancies and the influence of F+ vacancies on theblue luminescence of CaS:TmF3 phosphor were studied by photoluminescent (PL) and photoluminescent excitation spectra (PLE). It is concluded that CaS powders containing large amount of F+vacancies are not suitable for preparation of efficient CaS:TmF3 phosphor because of the energytransfer from host and Tin3+ luminescent centers to the F+ vacancies. The quajified CaS powderfor CaS:TmF3 phosphor was prepared by sulfurizing CaCO3 in S+H2S atmosphere.