Study On The Component Adjustment And Luminescence Properties Of Quantum Dots Borosilicate Glass

All-inorganic CsPbX₃（X=Cl,Br,I）perovskite quantum dots（PQDs）have made important contributions to the development of cutting-edge products in the fields of photoelectric display,photovoltaic,sensing and photo-catalysis due to their excellent properties such as high photo-luminescence quantum yield,excellent color purity and tunable emission color.But PQDs tend to degrade when exposed to water,light or high temperatures,which poses a serious challenge to their practical applications.Quantum dot glass material prepared by melt heat treatment is expected to solve the above problems due to the rigid protection of glass structure.In this paper,borosilicate CsPbBr₃quantum dot glass which is widely used and can realize green fluorescence emission is studied.Specifically,it includes the following three parts:（1）CsPbBr₃PQDs glass synthesized by self-crystallization method was successfully prepared.The ratio of[BO₃]and[BO₄]and the glass aggregation state were changed by changing the borosilicate ratio in the glass composition,and the mechanism of self-evolution of the glass was deeply analyzed.It is impressive that the CsPbBr₃perovskite quantum dot glass obtained by self-crystallization method has good color purity and high hydrothermal stability,which has broad application prospects in the field of photoelectric display.（2）The rare earth ion Eu³⁺doped borosilicate CsPbBr₃PQDs glass was successfully prepared by high-temperature melting combined with heat treatment.Through structural characterization and spectral analysis,it was found that Eu³⁺partially replaced Pb²⁺in CsPbBr₃QDs structure,which reduced toxicity to a certain extent.With the increase of Eu³⁺concentration,the luminescence center of CsPbBr₃borosilicate PQDs gradually blue shift.The luminescence mechanism and energy transfer mechanism of this process were analyzed in detail.In addition,the tunable emission of blue-green-red light can be realized by controlling the heat treatment temperature,which opens a new way for its application in the display field.（3）A novel Dy³⁺doped PQDs glass with thermochromic properties was prepared by melt quenching method and in-situ crystallization.The PL of the glass shows a double peak emission phenomenon（blue and yellow emission）by changing the doping concentration of RE Dy³⁺ions and the heat treatment temperature.The temperature sensing performance was characterized via the strong temperature dependence of CsPbBr₃PQDs and the temperature insensitivity of Dy³⁺ions,with the maximum absolute and relative temperature sensitivities reaching as high as 0.0887K^-1and 2.631%K^-1,respectively.Interestingly,the glass sample excited at 365 nm exhibits tunable polychromatic luminescence with the change of temperature.This work is expected to expand the application of PQDs glass in the field of optical temperature sensing and anti-counterfeiting.