纳米通道内能量转移法制备白光发射荧光材料

Preparation of white-light emitting materials through the energy transfer process in nanochannels

利用纳米空间内的能量转移过程设计制备一类新型白光发射的荧光材料.首先设计合成一种具有喹诺酮配体的表面活性剂(QC_(12)Et_3Br),再利用该表面活性剂的结构导向性自组装制备介孔二氧化硅材料,并向介孔二氧化硅孔壁中掺杂罗丹明硅烷类衍生物(RS)制备荧光介孔材料QC_(12)Et_3Br/RS/二氧化硅(RMM);然后向RMM的分散液中滴加Al^(3+)离子,在介孔孔道中表面活性剂可与Al^(3+)离子发生吸附配位作用形成荧光配合物,该配合物进而与孔壁中的罗丹明硅烷衍生物在纳米空间内形成荧光共振能量转移(fluorescence resonance energy transfer,FRET);最后改变Al^(3+)离子在复合材料中的含量来调节复合材料的发光波长,该材料可以同时发出红光和蓝绿光.结果表明,当向含4mg RMM复合材料的分散液中加入0.05mL 0.01mol·L^(-1) Al^(3+)离子时,可得到具有白光发射的复合材料.

A new type of white light emitting fluorescent material is designed and manufactured by using the energy transfer process in the nanometer space.Firstly,a novel surfactant with quinolone ligand is designed and synthesized.Then the mesoporous silica material is prepared by structuredirected self-assembly of the surfactant,and the rhodamine silane derivative is doped into the mesoporous silica pore wall.In order to prepare a fluorescent mesoporous material QCi2 Et3 Br/RS/Silica(RMM).A l3+ions are added dropwise to the dispersion of RM M,and the surfactant can cooperate with A l3+ions to form a fluorescence complex in the mesopores.The complex can form fluorescence resonance energy transfer(FRET)in the nanospace with Rhodamine silane derivativesin the pore wall.Finally,the content of A l3+ions in the composite material can be changed to adjust the emission wavelength of the composite material.This material can emit both red and blue-green light simultaneously.If Al3+ion(0.05 mL 0.01 mol·L-1)is added to the dispersion of 4 mg RMM composite,the white light emitting composite can be obtained.