研究目的
Investigating the photoinduced control of luminescence quantum yield for colloidal Ag2S/2-MPA quantum dots and their photostability.
研究成果
The study demonstrated that photoexposure of colloidal Ag2S/2-MPA QDs leads to an increase in size and monodispersity, enhancing the luminescence quantum yield. Dialysis purification improved monodispersity and photostability, making the QDs suitable for applications requiring high photostability and long luminescence lifetimes.
研究不足
The study is limited by the photochemical activity of silver sulfide, which affects the stability of optical properties under excitation radiation. The process of photoinduced growth and its effects on luminescence properties require further optimization.
1：Experimental Design and Method Selection:
The study involved the synthesis of colloidal Ag2S QDs passivated with 2-MPA in ethylene glycol, followed by photoactivation using 405 nm laser radiation. The optical and luminescent properties were analyzed before and after photoexposure.
2：Sample Selection and Data Sources:
Colloidal solutions of Ag2S/2-MPA QDs were synthesized with precursors AgNO3 and 2-MPA in ethylene glycol. Samples were collected every 10 hours during photoexposure.
3：List of Experimental Equipment and Materials:
Transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), Fourier-transform infrared (FTIR) spectroscopy, dynamic light scattering (DLS), optical absorption spectroscopy, photoluminescence (PL) spectroscopy, and time-correlated single-photon counting were used.
4：Experimental Procedures and Operational Workflow:
The synthesis was carried out at 25°C, followed by photoexposure with 405 nm laser radiation. Samples were purified by dialysis, and their properties were analyzed using various spectroscopic techniques.
5：Data Analysis Methods:
The luminescence quantum yield was calculated using the relative measurement method. Luminescence decays were fitted with a sum of exponentials to determine average lifetimes and recombination rates.
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PMC-100-20 PMT module
PMC-100-20
Becker & Hickl
Photoluminescence (PL) spectra and luminescence decays obtaining
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PDF10C/M photodiode
PDF10C/M
Thorlabs Inc.
Photoluminescence spectra recording in the NIR region
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NDV7375 laser diode
NDV7375
Nichia
PL excitation source
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NDB7675 laser diode
NDB7675
Nichia
PL excitation source
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Libra 120 transmission electron microscope
Libra 120
CarlZeiss
Structural studies of synthesized ensembles of QDs
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JEM-2100 transmission electron microscope
JEM-2100
Jeol
HR-TEM imaging for Ag2S QDs
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ARL X'TRA diffractometer
ARL X'TRA
Thermo Scientific
XRD patterns obtaining
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USB2000+ spectrometer
USB2000+
OceanOptics
Optical absorption spectra investigations
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TimeHarp 260 time-correlated single-photon counting board
TimeHarp 260
PicoQuant
Photoluminescence (PL) spectra and luminescence decays obtaining
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Tensor 37 FTIR spectrometer
Tensor 37
Bruker Optik GmbH.
FTIR absorption spectra recording
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Photocor Complex
Photocor Complex
Dynamic light scattering (DLS) measurements
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Alphalas PLDD-250 pulsed semiconductor laser
PLDD-250
Alphalas
Sample excitation
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MDR-4 diffraction monochromator
MDR-4
LOMO
Photoluminescence spectra recording in the NIR region
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