ZnO@MMT核壳量子点的制备及光学性能的研究

Preparation and Optical Properties of ZnO@MMT Core-Shell Quantum Dots

用一种操作简单、反应条件温和的方法制备得到分散性好的ZnO@MMT(蒙脱土)核壳量子点溶液,用荧光光谱(PL)和紫外吸收光谱(UV)对其进行表征,并探讨了MMT的用量和静置时间对氧化锌(ZnO)发光性能的影响。实验结果表明,ZnO@MMT核壳量子点在365nm紫外灯照射下发出黄绿色荧光,当激发波长为360nm时,在524nm处产生一个较强的发射光谱。当MMT的用量为0.1g、静置时间为10h时,量子点的荧光发光强度最强,此时产生明亮的黄绿色荧光。量子点可见光的吸收能力随着静置时间的延长而增强。

A ZnO@MMT(montmorillonite)core-shell quantum dot solution with good dispersibility was prepared by a simple method with mild reaction conditions,and then was characterizaed by fluorescence(PL)and ultraviolet(UV)absorption spectra.The effect of the MMT amount and the standing time on the luminescent properties of zinc oxide(ZnO)were investigated.The experimental results showed that the ZnO@MMT core-shell quantum dots emitted yellow-green fluorescence when irradiated with a 365 nm UV lamp.When the excitation wavelength was 360 nm,a strong emission spectrum was generated at 524 nm.When the amount of MMT was 0.1 g and the rest time was 10 h,the luminescent intensity of quantum dots was the strongest,and bright yellow-green fluorescence was generated at this time.The visible light absorbability of quantum dots increased with the increase of static time.