Eu^(3+)掺杂ZnS纳米晶的制备及其表面修饰

Preparation and Surface Modification of Eu^(3+)-doped ZnS NCs

通过水相法合成Eu^(3+)掺杂ZnS纳米晶(ZnS:Eu),合成的ZnS:Eu纳米晶具有立方晶形结构,粒径约为2 nm^4 nm,荧光谱图中可以检测到Eu^(3+)的5D0-7FJ(J=0,1,2)的特征吸收峰,这是由于在ZnS:Eu纳米晶内Eu^(3+)周围存在电荷缺陷和晶格缺陷导致的。为了实现ZnS:Eu纳米晶的功能性和可加工性,通过新颖的方法配体交换法合成了5-(2-甲基丙烯酰乙氧基甲基)-8-羟基喹啉(MQ)表面修饰的ZnS:Eu纳米晶(MQ-ZnS:Eu),表面修饰后的MQ-ZnS:Eu纳米晶与ZnS:Eu纳米晶相比较发光效率显著提高,且发射峰发生蓝移,蓝移约80 nm^90 nm,这可能是MQ与ZnS:Eu纳米晶之间协同作用导致的。

Eu3 ＋doping ZnS NCs were synthesized via an aqueous chemical route（ ZnS： Eu NCs）,the ZnS： EuNCs,with a cubic crystal structure,had the diameter of 2 nm ～ 4 nm. The characteristic luminescence from the5D0–7FJ（ J = 0,1,2）transition of Eu^3＋ was observed,this was attributed to the electrons and lattice distortion being localized around Eu^3＋. To carry out the functionality and processability of the ZnS： Eu NCs,MQ-ZnS： Eu NCs were prepared from the ZnS： EuNCs and 5-（ 2- methacryloylethyloxymethyl）- 8- quinolinol（ MQ） by a novel ligand exchange process. Fluorescence efficiency of MQZnS： Eu NCs improved significantly and had a blue shift,comparing to the ZnS： Eu NPs,shifted about 80 nm ～ 90 nm,possibly because of the cooperative interaction between MQ and ZnS： Eu NCs.