DPA/CaF_(2):Tb^(3+)纳米晶的合成及性能研究

Synthesis and property of DPA/CaF_(2)∶Tb^(3+) nanocrystal

采用水热法制备了形貌单一、水分散性好的DPA/CaF_(2)∶Tb^(3+)(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Cd^(2+)、Co^(2+)、Cr^(3+)、Cu^(2+)、Fe^(3+)、Mn^(2+)、Ni^(2+)、Zn^(2+)对纳米晶发光的影响。结果表明:Co^(2+)、Cr^(3+)、Fe^(3+)、Mn^(2+)这4种离子对DPA/CaF_(2)∶Tb^(3+)纳米晶的发光具有强的猝灭作用,其中Fe^(3+)的猝灭作用最强,浓度为5×10^(-4) mol/L的Fe^(3+)对DPA/CaF_(2)∶Tb^(3+)纳米晶在543nm处的荧光强度猝灭了92.75%,并探讨了Fe^(3+)猝灭纳米晶的发光机制。

DPA/CaF_(2)∶Tb^(3+)(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 Cd^(2+),Co^(2+),Cr^(3+),Cu^(2+),Fe^(3+),Mn^(2+),Ni2 +and Zn^(2+)ions on the luminescence of DPA/CaF_(2)∶Tb^(3+)were studied.The results shown that Co^(2+),Cr^(3+),Fe^(3+)and Mn^(2+)ions had strong quenching effect on the luminescence of the nanocrystals,among which Fe^(3+)had the strongest quenching effect.The quenching effect on the fluorescence intensity of DPA/CaF_(2)∶Tb^(3+)at 543 nm reached to 92.75% by Fe^(3+)at the concentration of 5×10^(-4) mol/L,and discussed the quenching mechanism on the luminescence.