Metal Nanoparticles Containning Electroluminescent Device Based On Quantum Dots

Mn-doped semiconductor nanocrystals have unique characteristics, for example, insensitive to outside environment and tunable emission wavelength, making it useful for application in high-quality display and solid-state lighting. Meanwhile, metal nanoparticles have strong local surface plasmon resonance, which could be utilized to enhance the efficiency of LEDs. In this thesis, Mn-doped semiconductor nanocrystals and metal nanoparticles in field-driven devices are studied. The main parts included are as following:First of all, Mn-doped CdS/ZnS semiconductor nanocrystals were synthesized by organic solvent method. Integration of Mn-doped CdS/ZnS semiconductor nanocrystals into field-driven light emitting diode(FD-LED) was demonstrated. Properties of Mn field-driven electroluminescence were examed via temperature, voltage, frequency-dependent, and time-resolved spectra. The EL spectrum is dependent on the location of Mn dopants, and the EL intensity is increased with the temperature, and then is decreased with the further rise of temperature.Secondly, Au and Ag nanoparticles(NPs) were fabricated using high-vacuum evaporation deposition and annealing. The SEM image and SPRs spectra showed that Au and Ag NPs could be made by annealing Au and Ag nano films.Finally, two contrast types of nanocrystals field-driven devices were fabricated. The only difference of them is that one of them contains Ag NPs. The nanocrystals electroluminescence enhancement by Ag NPs was demonstrated. The enhancement factors are 8.03,4.23 and 2.87 at 19V,21V and 23V, respectively. Due to the strong local surface plasmon resonance field, the transition probability of stimulated nanocrystals radiation is increased. The local surface plasmon resonance in the field driven device is attributed to:high energy electrons activation; light(emitted by nanocrystals) activation.