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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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How Does Local Strain Affect Stokes Shifts in Halide Double Perovskite Nanocrystals?
Saar Shaek1,2, Sasha Khalfin1, Emma Hasina Massasa1
1Department of Materials Science and Engineering, Technion - Israel Institute of Technology, 32000 Haifa, Israel.
Chemistry of Materials : a Publication of the American Chemical Society
|November 20, 2023
Summary
Doping lead-free Cs2AgNaInCl6 perovskite nanocrystals with Bi or Sb significantly alters their optical properties. Bi doping induces microstrain, while Sb doping yields brighter emission, offering pathways for display technology advancements.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Lead-free perovskite nanocrystals offer a non-toxic alternative for display applications.
- Tuning their optical properties requires understanding exciton emission dynamics.
- Silver-based double perovskites are promising candidates for optoelectronic devices.
Purpose of the Study:
- To investigate the impact of Bi and Sb doping on the optical properties of Cs2AgNaInCl6 perovskite nanocrystals.
- To elucidate the mechanisms behind the differing effects of Bi and Sb dopants.
- To provide insights for engineering optical properties in double perovskite systems.
Main Methods:
- Photoluminescence quantum yield (PLQY) measurements.
- Absorption spectroscopy and temperature-dependent photoluminescence.
- Huang-Rhys factor analysis to quantify exciton-lattice coupling.
- Synchrotron X-ray diffraction to assess microstrain.
Main Results:
- Doping Cs2AgNaInCl6 with Bi and Sb significantly enhanced photoluminescence.
- Bi and Sb exhibited distinct effects on optical properties due to differences in electronic contributions and ionic radii.
- Bi doping induced significant microstraining, while Sb doping resulted in brighter emission (PLQY ~40%).
- Huang-Rhys factor analysis confirmed varying exciton-lattice coupling strengths.
Conclusions:
- The study highlights the differential roles of Bi and Sb in tuning double perovskite optical properties.
- Ionic size and electronic structure are key factors influencing doping effects.
- Understanding these mechanisms is crucial for optimizing lead-free perovskites for display and optoelectronic applications.
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