Preparation And Optical Properties Of Manganese Doped Lead Halide Perovskite Quantum Dots And Composite Materials

In recent years,all inorganic lead halide cesium quantum dots（QDs）have caught the attention of many scholars and are attributed to their unique optical properties,such as narrow-band emission,high quantum yield,full spectrum tunable and many other advantages.They have made many breakthroughs both in terms of preparation and application.However,because the toxicity of heavy metal lead limits the application of lead halide cesium QDs,it is of great research value to replace some or all lead elements with environment-friendly elements without compromising the excellent luminescence performance of QDs.Second,QDs can only be dissolved in some non-polar solvents（such as n-hexane and toluene）,and air stability and thermal stability are extremely poor.Therefore,improving the stability of QDs is also a problem that needs to be solved.In this paper,a series of Mn-doped CsPbX₃ QDs solutions,composite material and borosilicate glass-ceramics were prepared by the traditional thermal injection method,sol-gel method,thermal sintering method and bulk crystallization method.Through a series of characterization methods,their size and photoelectric properties were analyzed.The research content of this paper is as follows:1.Dual-color emission of Mn-doped CsPbCl₃ and Mn-doped CsPb（Cl/Br）₃ QDs solutions were successfully prepared by thermal injection.Transmission electron microscopy（TEM）,X-ray diffractometry（XRD）and X-ray photoelectron spectroscopy（XPS）have demonstrated that Mn-doped CsPbX₃ QDs have been successfully prepared.Fluorescence spectrum（PL）analysis showed that a Mn²⁺emission peak appeared near 600 nm.By changing the ratios of MnCl₂,PbCl₂ and PbBr₂,the fluorescence spectrum of the Mn²⁺was changed.Secondly,the influence of temperature on QDs were also discussed.Then,WLED was constructed by blending the Ce-PiG and Mn-doped CsPbCl₃-ER materials with the InGaN blue chips.2.The Mn-doped CsPbCl₃ QDs-SAM solid composites were prepared by stirring and mixing QDs solution with Al₂O₃ and SiO₂materials by sol-gel method.The material not only maintains the excellent luminescent properties of the QDs,but also improves its stability.The material was composited with Ce-PiG and matched with the blue chip InGaN to obtain a fully inorganic perovskite QD warm white LED device.At a current of 20 mA,the light efficiency was 80.91 lm/W,the color rendering index was 83.8,and the color temperature was 4082K.3.Mn-doped CsPb（Cl/Br）₃ QDs glasses were prepared by thermal sintering and overall crystallization.A series of tests were carried out by changing the doping concentration of manganese and the effect of different crystallization temperatures on the glass.The results of fluorescence spectra and variable temperature spectra showed that the glass had excellent luminescence performance and maintained good stability and thermal stability in the air.