The Synthesis Of Cu-doped Telluride

Nanometer materials have been “hot” for several years, especially, thesemiconductor nanocrystals (quantum dots) turn out to be extraordinaryoutstanding due to their excellent luminescent properties, reliable synthesismethods, high-quality crystals and mesoscale size. Now, the synthesis methodsare getting versatile, and both oil-based methods and aqueous phase methods areavailable. Besides, the intentional impurities or dopants have been demonstratedas an effective means to improve the intrinsic particles on condition of keepingtheir basic qualities. Doping brings out new properties, such as a large numberof carriers, increased electrical conductivity, smaller resistance, enhancedthermo stability and the much wider emission spectrum.The Ⅱ-Ⅵ telluride compounds ZnTe and CdTe, both possess splendidqualities which can be further modified by doping. The emission spectrum ofZnTe covers the green-light areas, which is the promising material for LEDs.The narrow band gap of CdTe qualifies its infrared activity. Both ZnTe andCdTe have disadvantages, for example, the nano-size ZnTe has a great manysurface defects which restrict them give light out, while the wide emission CdTeis toxic to organism. Upon these, we hope to modify the deficiency by themethods of doping.In this article, we prepared a series of ZnTe in oil phase and exploitultraviolet absorption spectrum and fluorescence emission spectrum to charactertheir optical properties. The ZnTe we obtained are all in narrow size and shapedistribution, after doping, we controlled several reactive conditions toinvestigate the factor influenced PL intensity, and we tried to give someexplanations. As to CdTe, we prepared a series of sizes in aqueous solutions, and the spectrum results show all the particles are in a rather homogeneous structure.After doping, the emission spectrum is broadened to cover the infrared field.