采用水热法制备了形貌单一、水分散性好的DPA/CaF2∶Tb3+(DPA为2,6-吡啶二甲酸)发光纳米晶,并对纳米晶的结构以及发光性能进行了研究。采用荧光光谱研究了常见过渡金属离子Cd2+、Co2+、Cr3+、Cu2+、Fe3+、Mn2+、Ni2+、Zn2+对纳米晶发光的影响。结果表明:Co2+、Cr3+、Fe3+、Mn2+这4种离子对DPA/CaF2∶Tb3+纳米晶的发光具有强的猝灭作用,其中Fe3+的猝灭作用最强,浓度为5×10-4mol/L的Fe3+对DPA/CaF2∶Tb3+纳米晶在543nm处的荧光强度猝灭了92.75%,并探讨了Fe3+猝灭纳米晶的发光机制。
DPA/CaF2∶Tb3+ (DPA:2,6-pyridinedicarboxylic acid) luminescent nanocrystals with single morphology and good water dispersibility were synthesized by hydrothermal method.Structure and luminescence properties of the nanocrystals were studied.The influence of Cd2+,Co2+,Cr3+,Cu2+,Fe3+,Mn2+,Ni2+ and Zn2+ ions on the luminescence of DPA/CaF2∶Tb3+ were studied.The results shown that Co2+,Cr3+,Fe3+ and Mn2+ ions had strong quenching effect on the luminescence of the nanocrystals,among which Fe3+ had the strongest quenching effect.The quenching effect on the fluorescence intensity of DPA/CaF2∶Tb3+ at 543 nm reached to 92.75% by Fe3+ at the concentration of 5×10-4mol/L,and discussed the quenching mechanism on the luminescence.
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