Doped All-inorganic Perovskite And Their Optical Properties

APbX₃(A=CH₃NH₃⁺,Cs⁺;X=Cl^-,Br^-,I^-)Lead halide perovskites are emerging as excellent candidate materials for exploring optoelectronic devices,due to their superior optical/electronic performances.Meanwhile,incorporating impurities into the semiconductor lattice is the main ways to alter the properties of semiconductor materials and improve the conductivity,what's more,doping can also greatly impact the optical and magnetic properties of semiconductors.It has been proved that the structural stability and optical properties of perovskite materials can be optimized by introducing Mn into the lattice of perovskite materials,thus expands their application field.Therefore,it is one of the most popular fields to dop appropriate dopants into quantum dots and endow them with unique functions.Our work focuses on the rapid preparation of Mn doped perovskite materials at room temperature as well as the preparation of the stable and environment friendly perovskite and optimize their optical properties.The research are mainly concluded as follows:1)Mn doped Cs Cd Cl₃ perovskite materials were prepared by simply mixing the perovskite precursor and a small amount of deionized water at room temperature.The results show that the PL QY of the samples can reach up to 85%.Especially,the color of the luminescence can be changed from yellow to reddish brown with the change of water content in the sample,which is expected to be used in the field of water detection.2)Based on the advantages of good stability and environment friendly of the double structure perovskite,Mn:Cs₂NaInCl₆ double structure perovskite(DP)were prepared by hydrothermal method.The effects of synthesis temperatures,Mn/(Na+In)ratios and reaction times on the optical properties of the obtained samples were systematically studied.The samples show a PL peaked at about 610 nm,with the highest PL QY of 16%.Especially,it has a long decay lifetime of 17 ms,which is the longest lifetime in the reported Mn doped double structure perovskite materials.Furthermore,the PL mechanism of Mn:Cs₂NaInCl₆ was systematically studied by the temperature dependent PL and PL decay lifetime.Furthermore,we found that the luminescence of Mn ions is determined by the energy transfer efficiency(?Et)of excitons to Mn ions and the radiation transition efficiency(?Mn)of Mn ions.Compared with the traditional Mn-doped II-VI group materials,the slower energy transfer rate and the longer Mn ion fluorescence lifetime characteristics of Mn:Cs₂NaInCl₆ mainly come from the strong ionic bond characteristics of its Mn-halogen bond.3)The Sb:Cs₂NaInCl₆ DPs were prepared by hydrothermal method.The pure blue emission peak at 450 nm with relative narrow the full width of half maximum(FWHM)was obtained.Furthermore,Mn/Sb co doped Cs₂NaInCl₆ DP materials with a high PL QY of 65%were prepared and the influence of Mn/(Na+In)ratio on the optical properties were studied.The PL mechanism of Mn/Sb co doped Cs₂NaInCl₆ DP was investigated by steady-state and temperature-dependent spectra.It is amazing that Mn/Sb co doped Cs₂NaInCl₆ DP had good luminescent stability at low temperature range.It may come from strong local state luminescence.