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CN-121991681-A - Perovskite quantum dot composite material, light-emitting device and preparation method

CN121991681ACN 121991681 ACN121991681 ACN 121991681ACN-121991681-A

Abstract

The invention relates to a perovskite quantum dot composite material, which comprises tribromoform methylene chloride (CH 3 NH 3 PbBr 3 ) and nano gold. The preparation method comprises the steps of dissolving methyl amine bromide and lead bromide in dimethylformamide to obtain a first precursor, dissolving nano gold in toluene and/or chloroform to obtain a second precursor, and mixing the first precursor and the second precursor to obtain the nano gold perovskite quantum dot.

Inventors

  • MAI JINKANG
  • XU XIANYI
  • YUAN MINGJIAN
  • Manas Lan Zhan Samantha Ray
  • WANG ZHE

Assignees

  • 香港城市大学深圳研究院

Dates

Publication Date
20260508
Application Date
20241105

Claims (20)

  1. 1. A perovskite quantum dot composite material, the composite material comprising perovskite quantum dots and nanogold.
  2. 2. The composite material of claim 1, wherein the perovskite quantum dots are tribromo lead acid methylammonium.
  3. 3. The composite of claim 1, wherein the composite is an ionic gel.
  4. 4. A composite material according to claim 3, wherein the ionic gel is an ionic gel film.
  5. 5. The composite of claim 3 or 4, wherein the ionic gel comprises a polymer and an ionic liquid.
  6. 6. The composite material of claim 5, wherein the weight ratio of the polymer to the ionic liquid is 1:3 to 1:5.
  7. 7. The composite of claim 5 or 6, wherein the polymer comprises poly (vinylidene fluoride-co-hexafluoropropylene).
  8. 8. The composite of claim 5 or 6, wherein the ionic liquid comprises 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide.
  9. 9. The composite of claim 4 wherein the ionic gel film has a thickness of 350-450 μm.
  10. 10. The composite material of claim 1, wherein the perovskite quantum dots have a size of 5-6nm.
  11. 11. A preparation method of perovskite quantum dot composite material comprises the steps of mixing a first precursor containing perovskite quantum dots and a second precursor containing nano gold to obtain nano gold perovskite quantum dots.
  12. 12. The method of claim 11, wherein methyl amine bromide and lead bromide are dissolved in a first organic solvent to obtain the first precursor.
  13. 13. The method according to claim 11 or 12, characterized in that nanogold is dissolved in a second organic solvent to obtain the second precursor.
  14. 14. The method of claim 13, wherein the concentration of the nano-gold in the second organic solvent is 0.33-3mg/mL.
  15. 15. The method according to claim 11, wherein the nano-gold perovskite quantum dots are dispersed in a third organic solvent to obtain a nano-gold perovskite quantum dot colloidal solution.
  16. 16. The method of claim 15, wherein the nano-gold perovskite quantum dot colloidal solution is coated on an ion gel film to obtain a nano-gold perovskite quantum dot ion gel film.
  17. 17. The method of claim 12, wherein the first organic solvent is dimethylformamide.
  18. 18. The method according to claim 13, wherein the second organic solvent is toluene and/or chloroform.
  19. 19. The method of claim 15, wherein the third organic solvent is a non-polar organic solvent.
  20. 20. The method of claim 11, wherein the method of preparing the nanogold comprises mixing an aqueous solution of tetrachloroalloying with a solution of trisodium citric acid to obtain an aqueous solution of nanogold, and collecting the nanogold.

Description

Perovskite quantum dot composite material, light-emitting device and preparation method Technical Field The invention relates to the fields of nanotechnology and photoelectric materials, in particular to preparation of a composite material based on nano gold and perovskite quantum dots and application of the composite material in photoelectric equipment. In particular, the present technology aims to enhance the optical properties of perovskite quantum dots, in particular to increase their luminous efficiency in the green region, by preparing a novel hybrid composite material. Background Perovskite quantum dots are distinguished from other quantum dot materials by their quantum confinement effect and high photoluminescence quantum yield. The lead methylamine halide CH 3NH3PbX3 (x=cl, br, I) has been widely studied in solar cells and light emitting diodes due to its excellent characteristics such as high light absorption coefficient, tunable band gap, high carrier mobility, long carrier diffusion length, low temperature treatment and solution processability. By restricting the bulk perovskite structure in three dimensions, CH 3NH3PbX3 quantum dots are formed. Thus, fewer organic-inorganic perovskite material molecules are affected by optical and electrical limitations, exhibit significant optical properties such as high carrier mobility and strong room temperature photoluminescence, and simultaneously have narrow peak width and high luminescent purity. Among them, tribromolead acid methylammonium (CH 3NH3PbBr3) is of great interest because of its excellent properties in terms of green emission and excited state kinetics. Studies have shown that photoluminescent emission of organometallic halide perovskites can be enhanced by controlling size and dimensions. Due to the increased exciton binding energy in small-sized perovskite quantum dots, photoluminescence emission is more likely to be generated by exciton recombination rather than electron-hole recombination. Quantum dots with diameters less than about 4nm are expected to exhibit enhanced quantum confinement effects and have become a broad fundamental research object. The introduction of capping ligands on nanoparticle surfaces has been widely studied and has become a mature technology for regulating their size and morphology. Another strategy to control perovskite quantum dot size is by adjusting the ratio of organic and inorganic materials. The luminescent properties of perovskite quantum dots are directly related to the size and composition of the inorganic material. There is a limit to further improving the light emitting performance by reducing the size of quantum dots and performing a composite engineering in a perovskite structure. The plasmonic composite material can enhance the luminescent properties of the material without affecting the intrinsic properties of the perovskite structure. Perovskite quantum dots with high luminescence properties have potential for use in a variety of devices including light emitting diodes, solar cells, photodetectors, non-linear emission sources, electro-optic modulators, and the like. However, existing green light emitting perovskite quantum dots, such as CH 3NH3PbBr3, etc., have inherent luminescence wavelengths between 520nm and 535nm, and the pure luminescence spectrum depends on the complex of organic and inorganic materials and the size of the quantum dot. The prior quantum dot has two technical problems that (one) the size of the quantum dot directly affects the pure luminescence property, the highest luminescence effect can be realized by the exciton Bohr radius close to CH 3NH3PbBr3, the further reduction of the size of the perovskite quantum dot can affect the spectral response of the material, and the second component engineering adjustment can lead to the transition of the luminescence property from low wavelength to high wavelength. The application relates to the field of photoelectric material preparation, in particular to a preparation method of perovskite quantum dots capable of emitting green light and a perovskite quantum dot composite material based on plasma nanoparticles. Disclosure of Invention One aspect of the invention relates to a perovskite quantum dot composite material comprising perovskite quantum dots and nanogold. In some embodiments, the perovskite quantum dot is tribromo lead acid methylammonium. In some embodiments, the composite material is an ionic gel. In some embodiments, the ionic gel is an ionic gel membrane. In some embodiments, the ionic gel comprises a polymer and an ionic liquid. In some embodiments, the weight ratio of the polymer to the ionic liquid is 1:3-1:5. In some embodiments, the polymer comprises poly (vinylidene fluoride-co-hexafluoropropylene) (or "poly (vinylidene fluoride-co-hexafluoropropylene)"). In some embodiments, the ionic liquid comprises 1-ethyl-3-methylimidazoline bis (trifluoromethylsulfonyl) imide. In some embodiments, the thickness of the ionic ge