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Enhancing the Stability of Cesium-based Perovskite Quantum Dots Using Zeolitic Imidazolate Framework-8 (ZIF-8)for Optical Applications and Medical Imaging

Tabatabaei Rezaei, Nima | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53692 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. In this work, encapsulating cesium-based perovskite quantum dots (PQDs) in zeolitic imidazolate framework-8 (ZIF-8) was investigated in order to enhance their environmental, water and thermal stabilities. It was shown that physical mixing of pre-synthesized PQDs and nanocrystalline ZIF-8 (structure-I) does not have any influence on stability enhancement. In second structure, nanocrystals of perovskite were crystalized in ZIF-8 pores. These nanostructures kept 50% of their initial photoluminescence after 24 hours maintenance in water. In third structure, both perovskite nanoparticles and ZIF-8 structures were crystalized simultaneously which resulted in more efficient encapsulation and kept 40% of initial photoluminescence after 1 month maintained in water. Additionally, structure-II and III increased the thermal decomposition temperature of perovskite 19% and 41%, respectively in comparison with bare perovskite. Finally, cesium lead halide perovskite quantum dots were used as color conversion layer in white light emitting diode with 142% NTSC color gamut. Also, structure-II was utilized for cell imaging and they showed over 90% viability of MCF-7 cell line in concentrations lower than 1.25 mg/ml
  9. Keywords:
  10. Light-Emitting Diode (LED)Drivers ; Metal-Organic Framework ; Light Emission Diode (LED) ; Cell Imaging ; Perovskite Quantum Dots (PQDs) ; Stability in Aqueous Medias

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