Stokes Shift - Nanotechnology

What is Stokes Shift?

Stokes Shift refers to the difference in wavelength or energy between the absorption and emission peaks of a molecule or material. When a material absorbs light, it excites electrons to a higher energy state. As these electrons return to their ground state, they emit light at a longer wavelength due to energy dissipation in various forms. This shift from shorter to longer wavelength is what we call the Stokes Shift.

Why is Stokes Shift Important in Nanotechnology?

In the field of nanotechnology, Stokes Shift plays a crucial role in applications like fluorescence imaging, biosensing, and quantum dots. The larger the Stokes Shift, the easier it is to distinguish between the excitation and emission signals, which is vital for high-contrast imaging and accurate sensing.

How Does Stokes Shift Affect Fluorescence Imaging?

In fluorescence imaging, a large Stokes Shift allows for clear separation between the excitation light and the emitted fluorescence. This reduces background noise and enhances the signal-to-noise ratio, making it easier to detect and quantify the fluorescence from nanoparticles or biological samples. This is particularly useful in medical diagnostics and cellular imaging.

Applications in Quantum Dots

Quantum dots are semiconductor nanoparticles that exhibit unique optical properties, including significant Stokes Shifts. These properties make them ideal for applications in optoelectronics, photovoltaics, and bioimaging. The large Stokes Shift in quantum dots helps in minimizing cross-talk between absorption and emission, enhancing their performance in various applications.

Challenges and Solutions

One of the challenges in leveraging Stokes Shift in nanotechnology is the quenching of fluorescence due to interactions with the environment or other molecules. To overcome this, researchers are developing surface modifications and encapsulation techniques to protect the nanoparticles and maintain their optical properties. Additionally, advances in material science are leading to the creation of new nanoparticles with even larger Stokes Shifts and improved stability.

Future Directions

The future of Stokes Shift in nanotechnology looks promising, with ongoing research focusing on enhancing the efficiency and stability of nanoparticles. Innovations in nanofabrication and synthesis techniques are expected to produce materials with tailored Stokes Shifts for specific applications. Moreover, the integration of machine learning and computational modeling will likely accelerate the discovery of new materials with optimized optical properties.

Relevant Publications

Carbazole-embedded -benziporphyrinoid: synthesis, structure and a reversible chemodosimeter for mercury(II) ions.

Issue Release: 2024

Investigation on the Influence of Solvents Environment on the Optoelectronic Properties of the Fluorescent Probe 1,3,4-Oxadiazole Analogues: A Combined Theoretical and Experimental Study.

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Dithieno[2,3-b;3,2-f]phosphepinium-Based Near-Infrared Fluorophores: px-π* Conjugation Inherent to Seven-Membered Phosphacycles.

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Cancer-Targeting and Viscosity-Activatable Near-Infrared Fluorescent Probe for Precise Cancer Cell Imaging.

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Probing the toxic hypochlorous acid in natural waters and biosystem by a coumarin-based fluorescence probe.

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Synthesis of metal framework-modified carbon dots with super large stokes shift using Hami melon as a green precursor for detecting thiophanate-methyl residue in leafy vegetables.

Issue Release: 2024

Blue-Light-Excitable Red-Emitting Organic Antimony Halides as a Reversible Humidity Sensor.

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Dimethyl Dihydrophenazine: A Highly Conjugated Auxochrome in Fluorophores to Improve Photostability, Red-Shift Wavelength, and Enlarge Stokes Shift.

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A multipurpose mitochondrial NIR probe for imaging ferroptosis and mitophagy.

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Rational design of peptide-based fluorescent probe for sequential recognitions of Cu(II) ions and glyphosate: Smartphone, test strip, real sample and living cells applications.

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Near-infrared fluorescent probe for the imaging of viscosity in fatty liver mice and valuation of drug efficacy.

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Resolving Photoinduced Femtosecond Three-Dimensional Solute-Solvent Dynamics through Surface Hopping Simulations.

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Amphiphilic AIE Fluorescent Probe: A Dual-Functionality Strategy for Efficient Antibacterial Therapy Fluorescence Bioimaging against .

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From synthesis to applications of biomolecule-protected luminescent gold nanoclusters.

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An Imidazo[1, 2-a]Pyridine Based Fluorescent Probe for the Continuous \"on-off-on\" Detection of Fe and F.

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Isotope effect on the anomalies of water: A corresponding states analysis.

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Synthesis, Photophysical Properties, Theoretical Studies, and Living Cancer Cell Imaging Applications of New 7-(Diethylamino)quinolone Chalcones.

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A near-infrared fluorescent probe based FRET for ratiometric sensing of HO and viscosity in live cells.

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Effect of Dual-Organic Cations on the Structure and Properties of 2D Hybrid Perovskites as Scintillators.

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Dual-Emission Origins in Bi-Doped O Sesquioxides ( = Sc, Y, Gd and Lu): A First-Principles Study.

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