Quantum Dot/Plasmonic Nanoparticle Metachromophores with Quantum Yields That Vary with Excitation Wavelength

Nano Letters ◽  
2011 ◽  
Vol 11 (7) ◽  
pp. 2725-2730 ◽  
Author(s):  
Keiko Munechika ◽  
Yeechi Chen ◽  
Andreas F. Tillack ◽  
Abhishek P. Kulkarni ◽  
Ilan Jen-La Plante ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Plasmonic Nanoparticle

Experimental Study of Enhancement and Quenching of Plasmon-Controlled Fluorescence Using Quantum Dot–Plasmonic Nanoparticle Mixtures in Aqueous Medium

2012 ◽  
Author(s):  
Nola Palombo ◽  
Timothy Walsh ◽  
Jungchul Lee ◽  
Keunhan Park
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Quantum Dot ◽  
Near Field ◽  
Emission Spectra ◽  
Emission Wavelength ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Distilled Water ◽  
Plasmonic Nanoparticle

This article reports the enhancement and quenching of quantum dot (QD) emission for different concentrations of plasmonic nanoparticles (PNPs) by utilizing the Brownian motion-induced dynamic near-field interactions in aqueous solution. We measured the fluorescence spectrum of two types of QD-PNP mixtures. The first mixture was QDs (525 nm for emission wavelength) and gold nanoparticles dispersed in distilled water, where the emission wavelength of the QDs matches the localized surface plasmon (LSP) excitation wavelength of the gold nanoparticles. The second mixture was QDs (655 nm for emission wavelength) and silver nanoparticles dispersed in distilled water, where LSPs excited at the wavelength of 392 nm affect the excitation of the QDs. For both experiments, the QD emission spectra were monitored while changing the concentration of the PNPs from 108 to 1011 /mL for a fixed concentration of QDs at 1 × 1013 /mL. For low PNP concentrations, the QD emission was enhanced for 30 nm gold nanoparticles and 80 nm silver nanoparticles; however, for high PNP concentrations, the QD emission was always quenched. This research reveals the dependence of the QD fluorescence on the concentration of PNPs. The obtained results will be beneficial in further understanding plasmonic interactions between QDs and nanoparticles and the manipulation of QD emission, switching from enhancement to quenching or vice versa, with the alteration of nanoparticle concentration.

Excitation wavelength dependence of the photoluminescence quantum yield and decay behavior of CdSe/CdS quantum dot/quantum rods with different aspect ratios

2017 ◽  
Vol 19 (19) ◽  
pp. 12509-12516 ◽  
Author(s):  
D. Geißler ◽  
C. Würth ◽  
C. Wolter ◽  
H. Weller ◽  
U. Resch-Genger
Keyword(s):  
Quantum Dot ◽  
Wavelength Dependence ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Quantum Rods ◽  
Aspect Ratios ◽  
Decay Times ◽  
Cds Quantum Dot ◽  
Excitation Wavelength Dependence ◽  
Decay Behavior

Our results reveal a strong λexc-dependence of PL quantum yields and decay times, particularly for longer quantum dot-quantum rods with high aspect ratios.

scholarly journals Hydrothermal Synthesis of Aqueous-Soluble Copper Indium Sulfide Nanocrystals and Their Use in Quantum Dot Sensitized Solar Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1252 ◽  
Author(s):  
Calink I. L. Santos ◽  
Wagner S. Machado ◽  
Karl David Wegner ◽  
Leiriana A. P. Gontijo ◽  
Jefferson Bettini ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Water Soluble ◽  
Carbon Nanodots ◽  
Excitation Wavelength ◽  
Indium Sulfide ◽  
Selective Precipitation ◽  
Copper Indium ◽  
The Individual ◽  
Sensitized Solar Cells

A facile hydrothermal method to synthesize water-soluble copper indium sulfide (CIS) nanocrystals (NCs) at 150 °C is presented. The obtained samples exhibited three distinct photoluminescence peaks in the red, green and blue spectral regions, corresponding to three size fractions, which could be separated by means of size-selective precipitation. While the red and green emitting fractions consist of 4.5 and 2.5 nm CIS NCs, the blue fraction was identified as in situ formed carbon nanodots showing excitation wavelength dependent emission. When used as light absorbers in quantum dot sensitized solar cells, the individual green and red fractions yielded power conversion efficiencies of 2.9% and 2.6%, respectively. With the unfractionated samples, the efficiency values approaching 5% were obtained. This improvement was mainly due to a significantly enhanced photocurrent arising from complementary panchromatic absorption.

QUANTUM YIELDS FOR LASER PHOTOCYCLIZATION OF BILIRUBIN IN THE PRESENCE OF HUMAN SERUM ALBUMIN. DEPENDENCE OF QUANTUM YIELD ON EXCITATION WAVELENGTH

1989 ◽  
Vol 50 (3) ◽  
pp. 305-319 ◽  
Author(s):  
Antony F. McDonagh ◽  
Giovanni Agati ◽  
Franco Fusi ◽  
Riccardo Pratesi
Keyword(s):  
Quantum Yield ◽  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Quantum Yields ◽  
Excitation Wavelength

Luminescence quantum yields of gold nanoparticles varying with excitation wavelengths

Nanoscale ◽  
2016 ◽  
Vol 8 (4) ◽  
pp. 2188-2194 ◽  
Author(s):  
Yuqing Cheng ◽  
Guowei Lu ◽  
Yingbo He ◽  
Hongming Shen ◽  
Jingyi Zhao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Quantum Yields ◽  
Excitation Wavelength

The photoluminescence quantum yields of gold nanoparticles, nanorods and nanobipyramids are excitation wavelength dependent.

Understanding the Photoluminescence Mechanism of Carbon Dots

MRS Advances ◽  
2017 ◽  
Vol 2 (51) ◽  
pp. 2927-2934 ◽  
Author(s):  
Zhoufeng Jiang ◽  
Marta J. Krysmann ◽  
Antonios Kelarakis ◽  
Petr Koutnik ◽  
Pavel Anzenbacher ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Time Resolved ◽  
Light Emitting ◽  
Dependent Component ◽  
Different Types ◽  
Photoluminescence Mechanism ◽  
Time Resolved Photoluminescence ◽  
Absolute Quantum

ABSTRACTThe carbon dots were investigated to reveal their light-emitting mechanism. The fluorescence spectra of carbon dots show typically two different types of photoluminescence: the excitation-independent component in the short wavelength, and the excitation-dependent component in the longer wavelength. The UV-Vis spectrum of carbon dots shows the absorption maximum of 340 nm which should be accredited to the n-π* transition of the carbonyl group in carbon dots. Absolute quantum yields of carbon dots dispersed in Polyvinyl alcohol is around 15% when the excitation wavelength is less than 425 nm, but decreases continuously when the excitation wavelength increases. The decay lifetimes of the carbon dots also show an abrupt change at excitation wavelength 425 nm. Time resolved photoluminescence was implemented from 31K to 291K to study the photoluminescence decay dynamics of carbon dots, resulting in the continuously decreasing of the lifetime as the temperature increases.

Tuning of ultra-violet to green emission by choosing suitable excitation wavelength in ZnO: Quantum dot, nanocrystals and bulk

2009 ◽  
Vol 487 (1-2) ◽  
pp. 466-471 ◽  
Author(s):  
L. Robindro Singh ◽  
R.S. Ningthoujam ◽  
S. Dorendrajit Singh
Keyword(s):  
Quantum Dot ◽  
Ultra Violet ◽  
Green Emission ◽  
Excitation Wavelength

scholarly journals Enhanced quantum yields and efficiency in a quantum dot photocell modeled by a multi-level system

2019 ◽  
Vol 21 (10) ◽  
pp. 103015 ◽  
Author(s):  
Shun-Cai Zhao ◽  
Jing-Yi Chen
Keyword(s):  
Quantum Dot ◽  
Quantum Yields ◽  
Level System ◽  
Multi Level

Luminescence quantum yields of gold nanoparticles varying with excitation wavelength

2017 ◽  
Author(s):  
Yuqing Cheng ◽  
Yingbo He ◽  
Jingyi Zhao ◽  
Hongming Shen ◽  
Keyu Xia ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Quantum Yields ◽  
Excitation Wavelength
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