Crystallization Mechanism,Optical Properties And Applications Of Perovskite Oxide Glasses

In recent years,all-inorganic perovskite quantum dots have attracted extensive attention due to their excellent luminescence properties which makes them a promising candidate for the fabrication of LEDs,liquid crystals,temperature sensing and backlit displays.Encapsulating perovskite quantum dots into inorganic glass materials has become the most effective method to improve the stability of quantum dots.In this paper,perovskite quantum dot materials are encapsulated in different glass matrices by melt annealing method.Quantum dots are obtained in glass by heat treatment,mechanical crystallization and self-crystallization methods.This work has important academic value for revealing the mechanism of glass crystallization,and at the same time broadens readers’understanding of quantum dot glass,and has important scientific significance for promoting the development of photonic devices based on perovskite quantum dot materials.In the first chapter,the excellent optoelectronic properties and potential applications of perovskite quantum dot materials are mainly introduced.Next,the common quantum dot glass matrix,the structural properties of different glass matrix are introduced.Finally,some common methods for obtaining perovskite quantum dots in glass are discussed,as well as the topic selection and research significance.In the second chapter,the experimental raw materials,experimental equipment,the preparation process of quantum dot glass,the testing methods of related properties involved in this paper are mainly introduced.In the third chapter,a novel Tb³⁺ions doped Cs₄PbBr₆ quantum dots tellurate glass was prepared.Subsequently,we introduced more other rare earth ions into the Cs₄PbBr₆ quantum dots tellurate glass,and some rare earth ions entered the quantum dots lattice.The rare earth ion-doped Cs₄PbBr₆ quantum dots have different discrete energy levels,which causes the quantum dots glass material have different emission peaks.In the fourth chapter,erasable quantum dots glass was prepared.Then,Tb³⁺ions are doped in the quantum dots glass.Based on the different sensitivities of Tb³⁺ions and Cs₄PbBr₆ quantum dots to temperature,we used the Tb³⁺ions doped Cs₄PbBr₆quantum dot glass as a temperature sensing material,and the obtained maximum absolute sensitivity and relative sensitivity were as high as 0.2541 K^-1 and 2.68%K^-1,respectively.In the fifth chapter,the self-crystallization of quantum dots in borosilicate glass was realized.Subsequently,through further compositional tuning,we first prepared multicolor luminescent Cs Pb（Cl/Br/I）₃ quantum dots borosilicate glass.Then,the Cs Pb（Cl/Br/I）₃ quantum dots glass was exposed to frequent mechanical ball milling.Due to the high-energy mechanical force,the microstructural changes such as topology,chemical short-range order,and atomic rearrangement of borosilicate glass make it easier for quantum dots to crystallize on the glass surface.Therefore,the photoluminescence quantum yield of Cs PbBr₃ quantum dots glass is increased by120 times and that of Cs PbBr I₂ quantum dots glass is increased by 74 times.In the sixth chapter,we summarized the main results and innovations of the full dissertation,and at the same time pointing out the shortcomings of the paper and the prospect of the future.