PEG-COOH modified upconverting (purple-blue light)
SKU: 82958224931

PEG-COOH modified upconverting (purple-blue light)

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Description

PEG-COOH modified upconverting (purple-blue light)Product Name Name: PEG COOH modified upconverting nanoparticles (purple blue light) Product Overview Upconversion nanoparticles (UCNPs) are nanomaterials that can convert low energy light into high energy light. They are composed of inorganic nanocrystals doped with rare earth ions and have unique upconversion luminescence properties. Rare earth upconversion luminescence is based on the 4f electron transition of lanthanide rare earth ions. Currently,

Product Name

Name: PEG-COOH modified upconverting nanoparticles (purple-blue light)


Product Overview

Upconversion nanoparticles (UCNPs) are nanomaterials that can convert low-energy light into high-energy light. They are composed of inorganic nanocrystals doped with rare earth ions and have unique upconversion luminescence properties. Rare earth upconversion luminescence is based on the 4f electron transition of lanthanide rare earth ions. Currently, the common upconversion luminescence mechanisms can be summarized into three types: excited state absorption, energy transfer upconversion, and photon avalanche.

The preparation methods of upconversion nanoparticles mainly include coprecipitation method, high-temperature pyrolysis method, hydrothermal method, solvothermal method, sol gel method, etc. In order to widely apply UCNPs in the biomedical field, in addition to improving luminescence efficiency, it is also necessary to functionalize their surfaces to enhance water solubility and biocompatibility, and achieve multifunctionality. The main surface modification methods include ligand exchange (PEG, PEI, etc. with - COOH, - NH2 groups), ligand oxidation, ligand adsorption, layer by layer self-assembly, and silica coating.

Most of the rare earth doped ions in the nuclear nanoparticles are exposed on the crystal surface, which is prone to non radiative energy transfer with the external environment, leading to fluorescence quenching and thus reducing the upconversion luminescence efficiency. The most commonly used method to reduce this quenching process is to wrap an inert shell layer on the surface of doped nanocrystals to form a core-shell structure, which confines the luminescent ions in the internal core. The shell layer increases the distance between the luminescent center ion and the external environment, effectively reducing energy transfer and thus increasing the luminescence efficiency. At present, the most commonly used method is to modify the shell layer in the previously synthesized nuclear layer structure that is the same as the matrix material, such as NaYF: Yb, Er@NaYF4 NaYF4: Yb, Tm@NaYF4.


Technical Parameter

Emission wavelength: 365/475 nm

Excitation wavelength: 975-980nm

Particle diameter: 35 nm

Main components: NaYREF4 (RE:Yb, Tm) 

Product Features

 

Colorful luminescence: By changing the type and concentration of rare earth ions doped, multi-color luminescence from visible light to near-infrared light can be achieved.

Stokes shift is large: Stokes shift refers to the difference between the emission wavelength and the excitation wavelength. The Stokes shift of upconversion nanoparticles is relatively large, which can effectively reduce self absorption and background interference, improve luminescence efficiency and detection sensitivity.

Good photostability: Upconversion nanoparticles have good photostability and can maintain stable luminescence performance under long-term illumination.

Good biocompatibility: Through surface modification, upconversion nanoparticles can be coupled with biomolecules (such as proteins, antibodies, etc.) to achieve biological labeling and detection.

Non damaging to biological tissues: Its excitation light source near-infrared light (980nm or 808nm) has strong light penetration, almost no damage to biological tissues, and no background fluorescence.


Application Fields

 

Biomedical: Upconversion nanoparticles can serve as biomarkers for cell imaging, biological detection, drug delivery, and other applications. For example, coupling upconversion nanoparticles with antibodies or biomolecules can achieve targeted labeling and detection of specific cells or biomolecules.

Optical imaging: Upconversion nanoparticles can be used for deep tissue imaging, such as in vivo animal imaging. Due to its longer emission wavelength, it can penetrate deeper biological tissues, reduce tissue scattering and self fluorescence interference, and improve imaging clarity and contrast.

Photocatalysis: Upconversion nanoparticles can convert visible light into ultraviolet or near-infrared light, thereby broadening the spectral response range of photocatalytic materials and improving photocatalytic efficiency.

Solar cells: Upconversion nanoparticles can be used to improve the efficiency of solar cells. By combining upconversion nanoparticles with solar cell materials, low-energy photons can be converted into high-energy photons, increasing the absorption and utilization of solar light by the cell.


Related Information

Please e-mail for the detailed characterization data.

E-mail:[email protected]

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willis asbury
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Deborah S.
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Chris
Dallas, US
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Pretty, But Only Part One
Format: Hardcover
Absolutely beautiful copy, but does not include part 2, “Good Wives,” which is pretty commonplace in publishing today. And I could not find a part two that would match, so I still had to buy a separate book with both.
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Christina
Carnegie, US
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Not the Complete Book
Format: Hardcover, Format: Hardcover
This review is for the Wordsworth Classics Luxe edition of Little Women. Quality issues aside - the first thing to know is that this is NOT the complete version of this book. It is only chapters 1-23, or Part 1, and the full book has 47 chapters including Part 2. It is rare to see the book split like this, and wasn't even something I considered when purchasing it. It doesn’t say this anywhere in the product description. Now, onto quality: The good: This book has a lovely cover and interior page design. It also has a nice orange coloring on the sides and a standard quality ribbon. The text seems to be a good size and would be comfortable for reading. The bad: The overall quality is very poor. The book is made of what feels like construction paper, and it arrived with many blemishes and defects to its sides and corners. This book looks like it’s 25 years old, and is definitely not worth a cost of $20. Even if you were to purchase a new copy in relatively good shape, I can’t see this offering any kind of long term durability. Overall, I would not recommend this product to someone looking for a nice reading or display copy, or the full version, of Little Women. As a note: I also purchased the Luxe edition of Jane Eyre which had the same quality issues. I left a similar review on that page, although the full contents of that book appeared to be there.
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Tiffany haynes
Natrona Heights, US
★★★★★ 5
Beautiful Cover
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love the cover of this book. It's gorgeous
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