采用逐步热注射法合成了用于白光LED的Cu In S2/Zn S(CIS/Zn S)核壳结构量子点。通过调整Cu/In的比率,在Cu In S2(CIS)量子点的基础上,合成了发射波长在570~650 nm之间可调的CIS/Zn S量子点。与CIS量子点的低量子产率相比,具有核壳结构...采用逐步热注射法合成了用于白光LED的Cu In S2/Zn S(CIS/Zn S)核壳结构量子点。通过调整Cu/In的比率,在Cu In S2(CIS)量子点的基础上,合成了发射波长在570~650 nm之间可调的CIS/Zn S量子点。与CIS量子点的低量子产率相比,具有核壳结构的CIS/Zn S量子点的量子产率达到了78%。通过在黄光荧光粉YAG∶Ce3+表面旋涂CIS/Zn S量子点的方式制备了暖白光LED器件。在工作电流为10 m A时,暖白光LED的发光效率达到了244.58 lm/W。由于CIS/Zn S量子点的加入,所制备的白光LED器件的显色指数达到86.7且发光颜色向暖色调发生了转移,相应的色坐标为(0.340 6,0.369 0)。展开更多
CdS and CdS/ZnS quantum dots were synthesized by the microemulsion method in sulfosuccinic acid bis(2-ethylhexyl)ester sodium salt(AOT) surfactant reverse micelles containing water.The products were characterized by U...CdS and CdS/ZnS quantum dots were synthesized by the microemulsion method in sulfosuccinic acid bis(2-ethylhexyl)ester sodium salt(AOT) surfactant reverse micelles containing water.The products were characterized by UV-Vis spectrometer,transmission electronmicroscopy(TEM),energy dispersive X-ray spectroscope(EDX)and photoluminescence(PL) spectroscope.The diameter of CdS/ZnS nanoparticle was obvious larger than that of CdS nanoparticle.The diameter of the nanoparticle was estimated,which was confirmed by the images of TEM.The existence of core-shell structure was established by the result of energy dispersive X-ray analysis.PL studies of the samples showed that the luminescence from CdS was enhanced by the ZnS shell.A possible reason was that the ZnS shell reduced the number of defects on the surface of CdS quantum dots,which were assumed to act as centers for radiation-free recombination.展开更多
文摘CdS and CdS/ZnS quantum dots were synthesized by the microemulsion method in sulfosuccinic acid bis(2-ethylhexyl)ester sodium salt(AOT) surfactant reverse micelles containing water.The products were characterized by UV-Vis spectrometer,transmission electronmicroscopy(TEM),energy dispersive X-ray spectroscope(EDX)and photoluminescence(PL) spectroscope.The diameter of CdS/ZnS nanoparticle was obvious larger than that of CdS nanoparticle.The diameter of the nanoparticle was estimated,which was confirmed by the images of TEM.The existence of core-shell structure was established by the result of energy dispersive X-ray analysis.PL studies of the samples showed that the luminescence from CdS was enhanced by the ZnS shell.A possible reason was that the ZnS shell reduced the number of defects on the surface of CdS quantum dots,which were assumed to act as centers for radiation-free recombination.
