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<p>The combination of quantum dots (QDs) and phthalocyanine (Pc)-based photosensitive organic molecules can significantly alter the optoelectronic properties of the composite system, and is widely used in dye-sensitized solar cells, photocatalysis, optical limiting, and other fields, which is crucial for the study of the dynamics and mechanism of the composite system. In this work, we investigate the charge interaction dynamics between CdSe QDs and t-Bu4PcInCl (InClPc for short) molecules by the femtosecond pump-probe technique, steady-state absorption, photoluminescence (PL), and time-resolved fluorescence lifetime measurements. Transient absorption (TA) spectra and principal component projection intensity analysis reveal that a new bleaching signal appears after photoexcitation of the composite, which demonstrates that the photoinduced charge transfer (CT) in the system affects the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\pi\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>π</mi> </math></EquationSource> </InlineEquation>-<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\pi ^*\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>π</mi> <mo>∗</mo> </msup> </math></EquationSource> </InlineEquation> transition of energy levels within Q-band in InClPc molecules. Meanwhile, the fitting results of the TA spectra show that the CT process quenches the triplet state of InClPc molecules. The spectroscopy analysis demonstrates that InClPc molecules spontaneously adhere onto the surface of CdSe QDs upon simple mixing, accompanied by fluorescence quenching. The fluorescence lifetime of the QDs shows a slight decrease, while the fluorescence intensity is significantly suppressed, suggesting the existence of Förster resonance energy transfer (FRET). Our study demonstrates the influence of photoinduced charge and energy transfer between CdSe QDs and InClPc molecules on the dynamics of their composite system. This finding provides theoretical insights into the photoelectric properties and mechanisms of related systems.</p>

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Ultrafast triplet-fluorescence dual quenching dynamics in CdSe QDs/InClPc via charge transfer and energy transfer

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Xiangmin Ren,
  • Yunfeng Zhang,
  • Ruiqi Wu,
  • Fuxiang Ma,
  • Chunrui Wang,
  • Mingxin Jin,
  • Junfeng Shao,
  • Fei Chen,
  • Jin Guo

摘要

The combination of quantum dots (QDs) and phthalocyanine (Pc)-based photosensitive organic molecules can significantly alter the optoelectronic properties of the composite system, and is widely used in dye-sensitized solar cells, photocatalysis, optical limiting, and other fields, which is crucial for the study of the dynamics and mechanism of the composite system. In this work, we investigate the charge interaction dynamics between CdSe QDs and t-Bu4PcInCl (InClPc for short) molecules by the femtosecond pump-probe technique, steady-state absorption, photoluminescence (PL), and time-resolved fluorescence lifetime measurements. Transient absorption (TA) spectra and principal component projection intensity analysis reveal that a new bleaching signal appears after photoexcitation of the composite, which demonstrates that the photoinduced charge transfer (CT) in the system affects the \(\pi\) π - \(\pi ^*\) π ∗ transition of energy levels within Q-band in InClPc molecules. Meanwhile, the fitting results of the TA spectra show that the CT process quenches the triplet state of InClPc molecules. The spectroscopy analysis demonstrates that InClPc molecules spontaneously adhere onto the surface of CdSe QDs upon simple mixing, accompanied by fluorescence quenching. The fluorescence lifetime of the QDs shows a slight decrease, while the fluorescence intensity is significantly suppressed, suggesting the existence of Förster resonance energy transfer (FRET). Our study demonstrates the influence of photoinduced charge and energy transfer between CdSe QDs and InClPc molecules on the dynamics of their composite system. This finding provides theoretical insights into the photoelectric properties and mechanisms of related systems.