α-ZnS∶Mn纳米荧光粉热分解法制备及其发光性能

摘要

Sulfur metal-organic complexes were systhesized with Zn(NO3)2,Mn(NO3)2 and DDC(Diethyldithiocarbamate) as raw materials.ZnS ∶ Mn nano phosphors were synthesized through pyrolysis sulfur metal-organic complex in different reaction solution at 200 ℃.The results show that high temperature phase ZnS ∶ Mn with hexagonal structure was obtained.The ultraviolet absorption peak of the ZnS ∶ Mn prepared in diethylene glycol adding 5mL oleic acid was the highest,the particle size was smaller.The maximum PL intensity is observed only at the excitation 323nm.Under the excitation of 323nm,a yellow-orange emission 585nm from the Mn4T1-6A1 transition is observed along with the blue emission 450nm.With the enhancement of Mn2+ ions concentration,emission intensity 585nm increased firstly and then decreased.Emission intensity 585nm was the strongest at 4.0％ Mn2+.The correlation made through the concentration of Mnz versus PL intensity resulted in opposite trend of blue and yellow emissions.%以Zn(NO3)2·6H2O(硝酸锌)、Mn(NO3)2·3H2O(硝酸锰)和Ddtc· 3H2O(二乙基二硫代氨基甲酸钠)为原料,制得含硫金属有机配合物.将含硫金属有机配合物在不同反应溶液中,于200℃进行热解,制备了ZnS∶Mn纳米荧光粉.结果表明,样品为六方晶系的高温相α-ZnS∶Mn.在二甘醇加5mL油酸反应溶液中制得的ZnS∶Mn纳米材料紫外吸收峰最高,粒径更小.在323nm光激发下,看到了Mn2+的橘黄色发射峰(585nm)和ZnS的蓝色发射峰(450nm),随着Mn2+离子掺杂量增加,585nm发光强度先增加后减小,掺杂量为4％时达到最大值,而450nm发光强度变化与此相反.