Synthesis Of ZnS: Mn Nanoparticles And Their Application In Electroluminescence

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.