Preparation And Optical Properties Of Ion Doped CsPbBr₃ Quantum Dots Glass

All inorganic perovskite quantum dots CsPbX3（X = Cl,Br,I）have excellent photoelectric properties and have been applied in a variety of scenarios.Although perovskite quantum dots synthesized by chemical methods have great application potential,its poor stability has been a problem that can not be neglected.The perovskite quantum dots can be completely isolated from the external environment and improve the stability by depositing in the glass matrix.In addition,perovskite quantum dots have the characteristics of high emission intensity,long carrier diffusion length and long carrier lifetime,which determine its great application potential in the field of ultraviolet detection.In this paper,the in situ growth of CsPbBr₃ quantum dots in phosphate glass matrix was realized by melt quenching method.The structure and luminescent properties of CsPbBr₃ quantum dots in glass matrix were systematically studied;Furthermore,the microstructure optimization and luminescence performance improvement of CsPbBr₃ quantum dots in the glass matrix were achieved by Eu³⁺ and Mn²⁺ doping.Finally,the application potential of ion doped CsPbBr₃ quantum dots glass in ultraviolet detection is discussed.The main contents of this paper are as follows:（1）CsPbBr₃ quantum dots doped phosphate glass was prepared by melt quenching method.The results showed that the cubic CsPbBr₃ perovskite quantum dots were successfully grown in situ in the glass matrix by heat treatment of the precursor glass.With the increase of heat treatment temperature,the quantum dots in the glass matrix grow continuously,the XRD diffraction peak becomes stronger gradually,the fluorescence emission peak and UV-Vis absorption spectrum red shift.Finally,the stability test shows that the phosphate glass matrix can effectively improve the stability of CsPbBr₃ quantum dots.（2）Eu³⁺ doped CsPbBr₃ quantum dots glasses were prepared,and the effects of Eu³⁺doping on the microstructure and optical properties of CsPbBr₃ quantum dots in the glass matrix were studied.The results show that the introduction of Eu³⁺ can promote the crystallization and growth of CsPbBr₃ quantum dots in the glass,making its size smaller and more uniform.At the same time,Eu³⁺ doping can improve the luminescent properties of CsPbBr₃ quantum dots in the glass.Eu³⁺ exists in the glass network as the luminescent center and the energy transfer from CsPbBr₃ quantum dots to Eu³⁺ has been found.The stable down-conversion green light emission of Eu³⁺ doped CsPbBr₃ quantum dots glass in the range of 200-450 nm shows its application prospect in the field of ultraviolet detection.（3）Mn²⁺ doped CsPbBr₃ quantum dots glass was prepared,and the effects of Mn²⁺introduction on the crystal structure and optical properties of CsPbBr₃ quantum dots in the glass were studied.The results show that a part of Mn²⁺ enter into the lattice of CsPbBr₃ quantum dots to replace Pb2+ site,resulting in the lattice shrinkage,smaller size and more uniform growth of quantum dots.Mn²⁺ can be used as a nucleating agent to promote the crystallization and growth of CsPbBr₃ quantum dots in the glass network and improve the optical properties of CsPbBr₃ quantum dots.With the increase of heat treatment temperature,the energy transfer from CsPbBr₃ quantum dots to Mn²⁺gradually occurs.Finally,the luminescence characteristics of Mn²⁺ doped CsPbBr₃ quantum dots glass at 200-450 nm excitation wavelength were studied and the application potential in the field of ultraviolet detection was explored.