【作者】 谷洪亮；

【导师】 李云白；

【作者基本信息】 北京交通大学 ， 材料物理与化学， 2010， 硕士

【摘要】 ZnS：Mn纳米颗粒是一种橘黄色发光材料,同时它也是一种稀磁、宽禁带半导体材料,在发光和电子自旋相结合光电器件方面有很好应用潜力。本文利用水溶液晶核掺杂的办法在水溶液中制备出水溶性的ZnS：Mn纳米颗粒,通过X射线衍射(XRD)、透射电子显微镜(TEM)、光致发光光谱,吸收光谱和瞬态发光测试对制备的ZnS：Mn纳米颗粒进行了表征。研究发现ZnS：Mn的发光包括Zn空位的发光和Mn的发光,Zn空位的发光峰在479nm左右的蓝光范围,而Mn的发光峰在600nm附近。Mn的发光相对强度随着Mn的含量的增加有显著的增加,Mn的含量为1%时,发光强度为最大值。继续增加Mn的含量,则ZnS：Mn中Mn的发光强度会下降。测试的Mn2+的发光寿命,证实了Mn2+的发光寿命为几百个微妙。处于纳米表面和内部的Mn离子的激发态寿命不同,由此导致发光衰减是双e指数衰减。利用合成的ZnS：Mn与聚乙烯基咔唑(PVK)制作了有机电致发光器件和有机-无机复合电致发光器件,通过扫描电子显微镜(SEM)、电致发光、吸收光谱进行了表征,通过对器件电流密度、发光亮度和发光效率等性能的测试,证明了掺杂ZnS：Mn的有机器件比未掺杂ZnS：Mn的有机器件在性能上有一定的提高：如发光亮度,发光效率。通过磁场作用下对有机-无机复合发光器件性能的测试,证明了磁场增加载流子的注入,提高了发光强度。更多还原

【Abstract】 ZnS:Mn nanoparticles is an orange luminescent material, while it is also a magnetic semiconductor material with wide band gap. It have good potential applications in terms of combining light and electron spin optoelectronic devices. The water-soluble ZnS:Mn nanoparticles were synthesized through nucleation-doping strategy in aqueous solutions, and characterized by X-ray diffraction(XRD), transmission electron microscope(TEM), and photoluminescence (PL) spectra, and absorption spectra. It was found that the relative emission intensity of ZnS:Mn significantly increased with the increase of Mn concentration and got its Maximum when Mn concentration was 1.0%, and if Mn concentration continued to increase, the emission intensity of Mn would decrease. We found that absorption edge moved toward short wavelength with increase of ZnS:Mn nanoparticles by absorption spectra. It was proved that luminescence lifetime of Mn2+was hundreds of microseconds by testing.The electroluminescence devices based on synthetical ZnS:Mn and poly(N-vinylcarbazole), was fabricated and characterized by scanning electron microscope (SEM), electroluminescence, and absorption spectra. Chacteristics of current density, luminance, luminescent efficiency and so on that proved that the devices with the blend of PVK and ZnS:Mn nano particles as active layer showed more intense luminance and higher luminescent efficiency than that of the devices with PVK active layer. Testing property of organic-inorganic complex electroluminescence devices in magnetic field proved that magnetic field can enhance the electroluminescence.更多还原