氧化锌量子点和碳量子点及其复合物的制备与发光性能的研究

采用溶胶凝胶方法和水热法制备了水溶性荧光氧化锌量子点(Zn O-QDs)和碳量子点(C-QDs),其量子效率分别达到38%和61%。基于所合成的Zn O-QDs和C-QDs制备了氧化锌和碳量子点复合物(Zn O/CQDs),并分别对其发光特性进行了研究。透射电镜(TEM)图像表明,所合成的Zn O-QDs和碳量子点尺寸分布在3~6 nm之间,分散均匀。光致发光光谱表明,Zn O-QDs和碳量子点的发光峰中心分别位于540 nm和450 nm,两者发光峰的最佳激发波长为370 nm和350 nm。通过调整Zn O-QDs和C-QDs的体积比,所制备的Zn O/C-QDs能够实现荧光光谱的连续可调,并产生了白色荧光。

Preparation and Optical Properties of Zinc Oxide,Carbon and Their Quantum Dot Mixture

Water-soluble fluorescence zinc oxide quantum dots ( ZnO-QDs ) and carbon quantum dots ( C-QDs) were prepared by sol-gel and hydrothermal method, and their quantum yields were 38% and 61%, respectively. ZnO and carbon quantum dots mixtures ( ZnO/C-QDs) were prepared based on the as-prepared ZnO-QDs and C-QDs, and their optical properties were investigated, re-spectively. The transmission electron microscopy ( TEM) images indicate that the size of ZnO-QDs and C-QDs are around 3 -6 nm and disperse uniformly. The photoluminescence ( PL) spectra of ZnO-QDs and C-QDs dominate by a broad emission centered at around 540 nm and 450 nm, and their optimal excitation wavelengths are 370 nm and 350 nm. By adjusting the volume ratio between ZnO-QDs and C-QDs, the spectra of as-prepared ZnO/C-QDs show continuously variable properties, and white fluorescence can be observed from the ZnO/C-QDs.