-NH2 modified upconverting(yellow-green)
SKU: 29467763295

-NH2 modified upconverting(yellow-green)

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Description

-NH2 modified upconverting(yellow-green)Product Name Name: NH2 modified upconverting nanoparticlesyellow green 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

Product Name

Name: -NH2 modified upconverting nanoparticles(yellow-green 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: 545/660 nm

Excitation wavelength: 975-980nm

Particle diameter: 35 nm

Main components: NaYREF4 (RE:Yb, Er) 

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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Barry, Toronto
Boise, US
★★★★★ 5
A brilliant family, cultural and business history
Format: Kindle
What starts out as the personal and business history of a deeply religious and close family, expands into a study of the disintegration and continued importance of family, religious and cultural ties, the sources of anti-semitism and a window into some of the most dramatic moments of war and peace in the 20th century. Brilliantly researched, and interestingly written, it touches on topic after topic of importance, without pretence, and without either glorifying or deprecating the many contributions of the many Warburg family members it follows. Deserving of some high award, for sure!
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Dave
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★★★★★ 4
Wow ! What a great read
Format: Hardcover
I've read most of Ron Chernows books and they all are just overpowering. The history that you will learn is astounding, and it comes to you as a wonderfully told story. The Warburgs, will put the pieces of the history puzzle together from pre-WWI Germany to the Treaty of Versailles, WWII, post-WWII Germany, plus Warburg involvement with the creation of the current US Central Bank and service on the board of the Federal Reserve. The story covers the split of the family telling the stories of those who remained in Germany some of whom suffered death in the Holocaust, while others lost wealth, position, and sanity yet one remained relatively unscathed building a library of great works while in Germany through Hitler"s reign. The journey of the family is a European, American, and Anglo journey, of a family that prospered and suffered and prospered again leaving it's mark on history for the last three centuries, and still survives.
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Reviewed in the United States on January 21, 2013
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citizen fact checker
Charlottesville, US
★★★★★ 5
Very well researched, most informative and extremely well written.
Format: Hardcover
A talented writer, to say the least, Mr. Chernow seemed to research this remarkable book with the aim of painlessly educating even the most reluctant reader about an international banking family. He writes so well that this tome is a page turner: hard to put down, not the least boring even when the focus is on economics--the dismal science, as it is called--and helps one understand why many German Jews were heartbroken to leave Germany even during Hitler's regime. The Warburgs were an outstanding family with energy that seemed to know no bounds though some family members were stricken with diabetes, psychological illnesses and even poverty at times. Amazing! I highly recommend this wonderful book.
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Spartan mom 2012
New York, US
★★★★★ 5
Unpacks Nazi rhetoric & makes it relevant to today
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Ron Chernow’s best book ... unpacks Nazi rhetoric and makes it relevant to today. While I read his other books, honestly this book was far more impactful. I realized how little I knew about specific families and citizens in Germany during the rise of the Third Reich. While the Warburg family was extremely wealthy and atypical, they were very savvy yet still were very aligned to country which caused them to underestimate what was happening in Germany. I love to read about US leaders, but by reading this, realized I need to get out of US history and into global history. Also, while the Warburg brothers were the main focus, I appreciated focus and development of the important woman in the narrative.
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Jebo from Cali
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★★★★★ 5
A Comprehensive Framework for Tackling Complexity with Confidence
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Strategic Problem Solving is a powerhouse of a guide for anyone navigating today’s fast-paced, high-stakes business environment—or just dealing with tough challenges in general. Mark Hartley distills years of expertise into an actionable, easy-to-follow framework that makes complex decision-making feel manageable. The seven-step framework is the star of this book, offering a logical, systematic approach to breaking down big problems and creating solutions that stick. Each chapter walks readers through a specific phase of problem-solving, from defining the problem with precision to communicating and implementing solutions with clarity and impact. This isn’t just theory—every concept is illustrated with real-world examples, case studies, and practical tools like flowcharts and work plans. What makes this book stand out is its versatility. It’s perfect for professionals like executives, consultants, and managers, but the ideas can also apply to personal challenges. The tools for critical thinking, prioritization, and creative innovation feel universally relevant. Hartley’s writing is clear and concise, making even complex strategies approachable. One of my favorite aspects is the emphasis on real-world application. For example, the chapter on disaggregating problems compares tackling a challenge to scaling a mountain, encouraging readers to “break the mountain into hills.” It’s practical advice that sticks, and the accompanying tools like mind maps and timelines make it easy to translate into action. This book is more than just a manual for solving business problems—it’s a mindset shift. It helps you think critically, lead confidently, and make smarter decisions. Whether you’re managing a team, driving innovation, or simply trying to up your problem-solving game, this guide will be an invaluable resource. Highly recommended for leaders, thinkers, and anyone striving to navigate complexity with skill and precision!
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Reviewed in the United States on December 19, 2024

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