Study On Fluorescent Materials For Laser Display

Laser display as a new generation of display technology,its excellent display performance has aroused great concern in the field of scientific research and production,but because of its low safety,high cost and interference speckle noise and other shortcomings,it has not yet reached the full application standard.Laser-excited phosphor display technology mainly uses monochromatic lasers to excite the fluorescent materials to produce other light and eventually mix to obtain the desired light source.This technology not only solves the problem of laser dissipation speckle,but also inherits the advantages of traditional semiconductor light source in life and reliability and safety,and reduces the cost of laser light source.Therefore,the technology is expected to be used as a laser display of improved technology and eventually be widely used.At present,the research on the excitation of blue light in the field of laser display is scarce.Therefore,it is necessary to obtain the fluorescent material with high luminous efficiency,good stability and short fluorescence lifetime and high temperature resistance under the excitation of blue laser.The essential.The main contents of this paper are as follows:1.First,a series of characterization of the existing representative phosphor materials was carried out.The elemental composition and phase structure of X-ray photoelectron spectroscopy and X-ray diffractometer were analyzed.The microscopic morphology of the phosphor material was characterized by scanning electron microscopy,including particle size,particle uniformity and so on.The optical properties of the phosphor materials were characterized by photoluminescence spectroscopy and fluorescence spectrophotometer,including excitation and emission spectra,quantum yield and fluorescence lifetime.2.The use of phosphor materials with excellent optical properties through the high temperature reaction to obtain densified fluorescent ceramic materials,in order to obtain better optical and mechanical properties.In this paper,the preparation technology of blue laser-excited fluorescent ceramic materials was studied.In the process of sample body synthesis,the influence of the additive on the degree of densification of the sintered ceramic materials was investigated by changing the types and mass fraction of the additives,the pressing method and the pressure size,and the working mechanism was analyzed.In the process of high temperature firing of the sample,the influence of the maximum insulation temperature,the temperature rise and fall rate and the holding time on the sintering densification degree of the fluorescent ceramic materials were investigated.From the perspective of micro-particles,,Which explains the microscopic mechanism that sintering conditions affect the densification of ceramic materials and even their optical properties.Based on the experimental results,(1)In order to achieve the best degree of densification of the fluorescent ceramic material,there is an optimum mass fraction of the content of the additive added according to the different raw materials of the raw material during the mixing process.(2)In the green body during the compression molding process,the pressure size and pressure time there is an optimal value,the most conducive to full densification of the sample.(3)During the sintering process,the effect of increasing the holding temperature on the densification of the ceramic is larger than that of the holding time.The prolongation of the holding time may cause the abnormal growth of the grains,but decrease the fluorescence intensity and luminous efficiency.In this paper,the structure of synthetic ceramic materials were characterized by structural tests,including matrix and rare earth elements of the composition,phase structure,micro-morphology and so on.In addition,its optical performance to a certain degree of characterization,including material transmittance,emission spectra and quantum yield.The influence of the composition and microstructure of the ceramic composition on its optical properties and its mechanism were investigated.By comparing the optical properties of the phosphor powder material and the fluorescent ceramic material,it can be concluded that the densification of the structure can greatly improve the luminous intensity of the fluorescent material under the same composition conditions,and improve the luminous efficiency of the material to a certain extent.