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以多磷酸钠为分散剂,采用水相共沉淀法制备了Mn2+掺杂的ZnS量子点,通过X射线衍射(XRD)谱、高分辨透射电子显微镜(HRTEM)图像、紫外-可见吸收光谱和光致发光(PL)谱等表征了ZnS:Mn2+量子点的结构、形貌和发光性能;通过对比在空气中干燥前后样品的PL谱,进一步证明了441 nm的峰是属于与硫空位相关的发射。同时,将处理后的样品分散到氯仿中,制备了单层的电致发光(EL)器件,在12 V直流电压的驱动下,在597 nm的位置观测到了Mn2+相关的特征发射。
Mn2 + -doped ZnS quantum dots were prepared by aqueous coprecipitation method using sodium polyphosphate as dispersant. The XRD patterns, HRTEM images, UV-Vis absorption spectra and photoluminescence (PL) spectra characterize the structure, morphology and luminescent properties of the ZnS: Mn2 + quantum dots. By comparing the PL spectra of the samples before and after drying in air, it is further demonstrated that the 441 nm peak belongs to the sulfur vacancy associated emission. At the same time, the treated sample was dispersed into chloroform to fabricate a single-layer electroluminescent (EL) device. The characteristic emission of Mn2 + was observed at 597 nm driven by 12 V DC voltage.