基于聚集荧光增强体系的掺杂纳米粒子的可调控荧光发射与能量传递性质研究

Tunable Fluorescence Emission and Efficient Energy Transfer in N,N'-di[4-(2'-benzo[d]thiazolyl)-3-hydroxyphenyl]5-tert-butylisophthalamide Doped Nanoparticles

通过再沉淀法制备了平均粒径200nm左右的N,N'-双[4-(2'-苯并噻唑)-3-羟苯基]-5-叔丁基异酞酰胺(DHBIA)有机纳米粒子.纳米粒子呈现出明显的聚集诱导荧光增强(AIEE)性质.基于DHBIA聚集体的强荧光发射强度,当其中掺杂有红光发射化合物N,N'-双[(4-二苯胺)-苯甲醛缩]二氨基马来腈(PBDM)作为能量受体时,可清楚地观察到掺杂纳米颗粒中两种组分间的能量传递现象.结果表明:通过改变分子PBDM在体系中的掺杂浓度,可实现对体系发光由绿色到红色的调控.

By a facile reprecipitation method, organic nanoparticles with relatively uniform diameter of 200 nm of DHBIA {N,N＇-di[4-（2＇-benzo[d]thiazolyl）-3-hydroxyphenyl]5-tert-butylisophthalamide} have been prepared, which exhibited obvious aggregation induced enhanced emission. Based on the strong fluorescence of DHBIA in solid state, the red fluorescent compound PBDM {N,N＇-bis-[（4-diphenylamino）- benzylidene]-diaminomaleonitrile } has been doped in the DHBIA nanoparticles and significant energy transfer was observed from DHIBA to PBDM. It was found that with increasing molar fraction of PBDM, the fluorescence could be tuned from green to red. Energy transfer in the doped nanoparticles was highly efficient and dominated by the Forster resonance mechanism. The emission tuning was much correlated to the intramolecular charge transfer in the PBDM molecules.