The Study Of Ultra-stable CsPbX₃ Quantum Dot Glasses With Its Laser Up-conversion And Photoelectric Properties

All-inorganic lead cesium halide?Cs Pb X₃,X=Cl,Br,I?perovskite quantum dots have excellent photoelectric properties.By adjusting the halogen composition,the emission of Cs Pb X₃ quantum dots in the visible range can be adjusted,and the doping of Rb⁺is a new method to adjust the emission wavelength of perovskite quantum dots.In recent years,due to the high optical gain coefficient,long carrier diffusion length,and high absorption coefficient of Cs Pb X₃ perovskite quantum dots,their exploration in the fields of up-conversion spontaneous emission?ASE?and laser applications has also caused extensive attention.However,the quantum dots colloidal solution have inferior stabilities,which seriously hinders its practical applications.Therefore,it is very important to prepare a stable quantum dot composite material.In this thesis,Rb⁺doped Cs Pb Br₃ and Cs Pb X₃ quantum dot glass were prepared by melt thermal quenching technology and glass crystallization methods.Through a series of characterization methods,their photoelectric properties and laser up-conversion characteristics were studied.The research content of this paper is as follows:?1?A series of Cs Pb Br₃:x Rb quantum dot glasses were prepared by the traditional melting thermal quenching technology and glass crystallization method.By adjusting the ratio of Rb⁺/Cs⁺,the emission of quantum dot glasses can be adjusted in the range of 475-523 nm,and its line width is 65-71 nm.In addition,by means of a series of characterization methods,the optical properties,structure,growth mechanism,and well stability of the Cs Pb Br₃:x Rb quantum dots glass were analyzed.Finally,Cs Pb Br₃:0.4Rb quantum dots glass was compounded with commercial Ca Al Si N₃:Eu²⁺phosphors under the excitation of an In Ga N blue light chip to construct a White Light Emitting Diode?WLED?device.?2?Full-spectrum Cs Pb X₃?X=Cl,Br,I?quantum dots were embedded into a dense borosilicate glass matrix,covering the visible light range of 417-700 nm,and effectively solving the stabilities issues of Cs Pb X₃quantum dots to resist water and heat.Under the excitation of a800 nm fs laser pumping,full-spectrum Cs Pb X₃ quantum dot glasses achieve tunable up-conversion emission in the range of 420 nm to 714 nm.In addition,The morphology,up-conversion luminescence mechanism,and up-conversion temperature luminescence and exciton binding energy of Cs Pb Cl_1.5Br_1.5,Cs Pb Br₃,Cs Pb Br_1.5I_1.5 quantum dots glasses were analyzed in detail.And demonstrate that Cs Pb Cl_1.5Br_1.5 quantum dots glass with high exciton binding energy??87.5 me V?can achieve ASE more easily than the other two kinds of glasses.?3?The ultra-stable Cs Pb Br₃ quantum dot glasses were successfully prepared by the glass crystallization method.By increasing the heat treatment temperatures,the average particle sizes of Cs Pb Br₃ quantum dots increased,and its emission wavelength have red shift from 498 nm into 522 nm.Cs Pb Br₃ quantum dots glasses achieve ASE and random lasing under the excitation of a 800 nm fs laser pumping.By increasing the heat treatment temperatures,the optical gain coefficients of Cs Pb Br₃quantum dots glass is effectively increased by more than 5 times as the particle size of quantum dots increases,and their laser thresholds are greatly reduced.