Study On Optical Field Modulation And Photoelectrical Properties Of Hybrid Quantum Dot-liquid Crystal Devices

Optoelectronic displays are developed from cathode ray tube(CRT)display to liquid crystal display(LCD),plasma display panel(PDP),organic light emitting diode display(OLED).With the development and progress of photoelectric display technology,how to improve the resolution of the photoelectric display,response time,brightness,contrast and other performance indicators has become the focus of the development of the direction of people.Liquid crystal displays have been widely used in the field of optoelectronic display with the advantages of low power,low driving voltage,large information display,and easy to color.The quantum dots have a prominent advantage in improving the energy efficiency and color quality of the optoelectronic display devices.The photorefractive composite structures prepared by doping quantum dots into liquid crystal solutions have attracted a great deal of attention in recent years.The periodic light field is used to act as a quantum dot-liquid crystal mixture.The refractive index change caused by the photorefractive effect is changed by the photorefractive effect,and the diffraction efficiency,response time and other visual performance parameters are studied by photoelectric regulation.These researches are of great reference value and practical significance for improving multiple visual performance parameters of optoelectronic devices.Due to the wide application and development prospect of highly ordered photorefractive materials,this paper,based on the in-depth study of the preparation technology of quantum dot-liquid crystal composite structures,proposes a quantum dot-liquid crystal composite structure device which is prepared by focusing and controlling the laser evanescent standing wave field.Analysis and research,and the design of quantum dot liquid crystal photorefractive devices.A quantum dot-liquid crystal photorefractive device and its corresponding photorefractive are tested by a beam of probe light.Finally,the photoelectric properties of the device are tested and studied by the evanescent stationary wave of the laser and the applied electric field.The following are the main contents and corresponding conclusions of this thesis.1.The characteristics of the focusing of the evanescent standing wave field are deeply studied.The change of the polarization state of the evanescent standing wave field,the intensity of the electric field and the distribution of the electric field vector are calculated and simulated in detail.We discuss the basic composition of the photorefractive material and analyze the basic principle of the photorefractive effect.The establishment and simplification of the physical model of photorefractive effect are also analyzed.2.A quantum dot liquid crystal mixed solution was prepared and the liquid crystal mixed solution required by the compound experiment was prepared.On the basis of the theory,the liquid crystal boxes were designed and complex processed and fabricated by the related instruments.Then we designed and built the evanescent stationed wave optical path and applied the evanescent stationary wave of the laser.Fabrication of quantum dot liquid crystal photorefractive devices by field focusing liquid crystal cell3.Through the physical model of the photorefractive effect,the related parameters of the photorefractive effect produced by the prepared quantum dot-liquid crystal photorefractive device are calculated and simulated,and the diffraction phenomenon caused by the photorefractive is observed.Then,through a comparative experiment,it is proved that the quantum dot liquid crystal photorefractive device produced by the evanescent standing wave field can produce the corresponding diffraction phenomenon,which proves the existence of the photorefractive effect in two aspects of simulation and experiment.Then we detect the photoelectric properties of the device and regulate the evanescent standing wave field.The size of the applied electric field is measured and the variation of the diffraction efficiency with the applied voltage and the incident light power is calculated.Then the diffraction efficiency is theoretically analyzed with the curve of the applied voltage and the incident light power.