Study On Ion Doped Perovskite Quantum Dot Glass

Fully inorganic perovskite quantum dots have been widely used in the field of white LED,solar cells and lasers due to their excellent luminescence performance,but their poor stability hinders their practical application.At present,researchers have significantly improved the stability of perovskite quantum dots especially the moisture resistance by combining perovskite quantum dots with inorganic glass.However,perovskite quantum dot glass still has the disadvantages of narrow application field and low quantum yield,which hinder the further development of perovskite quantum dot glass.In this paper,perovskite quantum dot glass is doped with different ions in different glass substrates through high temperature melting and low temperature heat treatment.The application field of perovskite quantum dot glass was expanded and the quantum dot glass yield of perovskite was significantly improved by changing the concentration of doped ions and the content of perovskite elements and the heat treatment temperature.The main research contents and results are as follows:?1?Mn²⁺ doped Cs Pb?Cl Br?₃ perovskite quantum dots were prepared using borophosphate glass as matrix.XRD and PL and Decay spectrogram proved that Mn²⁺ doped Cs Pb?Cl Br?₃ perovskite quantum dots were grown in glass,and the optimal doping molar concentration of Mn²⁺ was 4%.Elemental mapping proved that only a small amount of Mn²⁺ entered the lattice of perovskite quantum dots,while most Mn²⁺ remained in the glass matrix.According to the characteristics of Mn²⁺ luminescence intensity is not affected by temperature almost and the luminescence intensity of perovskite quantum dots gradually decreases with the rise of temperature,the relation between peak ratio and temperature was obtained according to the variable-temperature spectrum.The highest calculated temperature sensitivity was 10.04% K^-1,significantly higher than the low temperature detection materials previously reported,indicating that Mn²⁺ doped Cs Pb?Cl Br?₃ perovskite quantum dot glass could be used as a luminescent temperature-sensitive medium for high-precision low temperature detection.?2?Glass mixed with Yb/Ln?Ln= Er,Tm?and Cs Pb Br₃ perovskite quantum dots was prepared by using tellurate glass as matrix.XRD and PL and TEM spectra show that Cs Pb Br₃ quantum dots with cubic phase have been grown in glass.By using Cs Pb Br₃ perovskite quantum dots' absorption of green light?520 nm?and the light before green light?<520 nm?,and by changing its incorporation,the upconversion color regulation of Er³⁺ from yellow and green light to orange light and Tm³⁺ from blue light to red light was realized,which opens up a new application of perovskite quantum dots in regulating luminescent colors of the upconversion on glass.?3?Cs Pb X₃?X= Cl,Br,I?perovskite quantum dots were prepared by using borosilicate glass as matrix and doping fluoride ions.XRD and PL and TEM show that Cs Pb X₃?X= Cl,Br,I?cubic crystals have been precipitated out of the glass.The luminescence of perovskite quantum dots is controlled by changing the heat treatment temperature.Fluoride ion provides sufficient space for perovskite element diffusion by breaking the Si-O-Si bond to form the Si-F bond,which promotes the nucleation and growth of perovskite quantum dots,and significantly improves the quantum yield.Green light?Cs Pb Br₃?and yellow light?Cs Pb Br₂I?and red light(Cs Pb Br_1.5I_1.5)quantum dot glass and blue light chip In Ga N are used to assemble white LED.The lumen efficiency is 60?75lm/W,the color temperature is 2000?3500K,and the color rendering index is 80?90.