研究目的
Investigating the influence of substitutional defects introduced by trivalent dopants (In, Sb, and Bi) on the photoluminescence quantum yield and stability of CsPbBr3 perovskite quantum dots.
研究成果
Doping CsPbBr3 QDs with trivalent elements (In, Sb, and Bi) at optimal concentrations enhances PL quantum yield and stability. The study provides insights into the mechanisms behind these improvements, including suppression of nonradiative recombination and ionic migration.
研究不足
The study is limited to the effects of trivalent dopants (In, Sb, and Bi) on CsPbBr3 QDs. The computational simulations were simplified due to the high computational cost of simulating quantum dot structures with thousands of atoms.
1：Experimental Design and Method Selection:
The study employed ligand-assisted reprecipitation (LARP) method at room temperature for synthesizing colloidal CsPbBr3 QDs with trivalent dopants. Theoretical investigations were conducted using density functional theory (DFT) calculations to understand the impact of dopants on PL relaxation.
2：Sample Selection and Data Sources:
CsPbBr3 QDs were synthesized with varying concentrations of trivalent dopants (In, Sb, and Bi). Optical properties were measured using UV-Vis-NIR spectrophotometry and PL spectroscopy.
3：List of Experimental Equipment and Materials:
Chemicals included PbBr2, InBr3, oleic acid, butylamine, toluene, acetonitrile, and DMF. Equipment included UV-Vis-NIR spectrophotometer, absolute PLQY spectrometer, HRTEM, XRD, UPS, and XPS.
4：Experimental Procedures and Operational Workflow:
QDs were synthesized by dissolving CsBr and PbBr2 in DMF, adding dopants, oleic acid, and butylamine, then precipitating in toluene. The solution was centrifuged and analyzed.
5：Data Analysis Methods:
PL decay was analyzed using time-correlated single photon counting spectroscopy. DFT calculations were used to simulate defects and their impact on PL relaxation.
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XRD
X’pert-PRO
Panalytical
Used to measure the X-ray diffraction patterns of CsPbBr3 QDs
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UV-Vis-NIR spectrophotometer
Cary 5000
Agilent technologies
Used to measure the absorption spectra of CsPbBr3 QDs
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absolute PLQY spectrometer
Quantaurus-QY
Hamamatsu photonics
Used to measure the PL spectra of CsPbBr3 QDs
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Fluorescence lifetime analysis
Quantaurus-tau
Hamamatsu photonics
Used to record the time-resolved PL decay of CsPbBr3 QDs
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HRTEM
HF-3300
Hitachi
Used to obtain high-resolution transmission electron microscope images of CsPbBr3 QDs
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PbBr2
Sigma-Aldrich
Used as a precursor in the synthesis of CsPbBr3 QDs
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InBr3
Sigma-Aldrich
Used as a dopant in the synthesis of CsPbBr3 QDs
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oleic acid
Sigma-Aldrich
Used as a ligand in the synthesis of CsPbBr3 QDs
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butylamine
Sigma-Aldrich
Used as a ligand in the synthesis of CsPbBr3 QDs
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toluene
Sigma-Aldrich
Used as a solvent in the synthesis of CsPbBr3 QDs
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acetonitrile
Sigma-Aldrich
Used to remove precipitated particles and organic matters in the synthesis of CsPbBr3 QDs
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DMF
Sigma-Aldrich
Used as a solvent in the synthesis of CsPbBr3 QDs
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CsBr
Alfa Aesar
Used as a precursor in the synthesis of CsPbBr3 QDs
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SbBr3
Alfa Aesar
Used as a dopant in the synthesis of CsPbBr3 QDs
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BiBr3
Alfa Aesar
Used as a dopant in the synthesis of CsPbBr3 QDs
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UPS
ULVAC-PHI
Used to measure the HOMO level of CsPbBr3 QDs
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XPS
PHI 5000 Versa Probe II
Used to conduct x-ray photoelectron spectroscopy measurements of CsPbBr3 QDs
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