ZnS∶Er纳米晶的水热合成及其性能研究

Study on Hydrothermal Synthesis and Properties of Er-doped ZnS Nanocrystals

该文以硫代乙酰胺为硫源,采用水热法合成了ZnS∶Er纳米晶。并用X线衍射(XRD)、透射电子显微镜(TEM)、X线光电子能谱仪(XPS)、荧光光谱仪对其物相、形貌、组成及光学性能进行了表征。结果表明,ZnS∶Er纳米晶为立方闪锌矿结构,粒径约为5nm。由XPS图谱可知,ZnS∶Er纳米晶中存在Zn、S、C、O、Er等元素。ZnS∶Er纳米晶荧光光谱中出现了2个主要发射峰,分别位于469nm和583nm处。两发射峰的发光强度随着pH的升高而增强且发光峰的位置存在微弱的蓝移,pH=12时,两发射峰的荧光强度最强;随着Er3+掺杂量的增加,469nm处发射峰的强度先增强后减弱,583nm处发射峰的强度随之减弱。

The ZnS：Er nanocrystals were synthesized by the hydrothermal method with thioacetamide as the sulfur sources.The phase,morphology,components and luminescent properties of the nanocrystals were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,transmission electron microscopy（TEM）and fluorescence spectrophotometer.The results show that ZnS∶Er nanocrystals have cubic zinc blende crystal structure with an average size of5nm.Zn、S、C、O and Er elements are found in the ZnS∶Er nanocrystals from XPS spectra.ZnS∶Er nanocrystals have two emissions peaks at 469 nm and 583 nm,the two emissions peaks become more intensive and shift towards blue side as the value of the pH increases,which is the strongest performance at pH=12.The intensity of the peak at 469 nm enhances as the Er-doped content enhances initially and weakens afterwards,but the intensity of the peak at 583 nm always weakens.