Navigation Links
Photoluminescence Spectroscopy of Quantum Dots, monitored by the Spex FluoroMax

ercaptoacetic acid are in the aqueous layer.

Figure 1. QDs coated with tri-n-octyl phosphine oxide (tri) and mercaptoacetic acid (mer) under (a) ambient and (b) ultraviolet illumination. The upper layer is water; the lower layer is CCL4.


A range of alloyed QDs were examined via absorption and photoluminescence spectroscopy (Figure 2). Comparative literature values for bulk alloys are included (3). The data reveal resolved electronic transitions, plus fluorescence emission at the band-edge. Note the unexpected depression in band-gap for all nanoparticle sizes at about 60% Te. The generally successful Vegard's law (4) for thin-film and bulk alloys is linear,

Ealloy = xEA + (1 - x)EB

where x = mole fraction, and EA, EB and Ealloy are the band-gaps for pure materials A, B and alloy of A and B respectively. Vegard's law, however, is only a first approximation, and others (5) have found this "optical bowing" in bulk CdSeTe, so this effect is not solely caused by quantum confinement.

Figure 2. Composition versus absorpotion and emission energies for CdSe1-xTex nanoparticles. (a) Absorption and photoluminescence of CDSe0.34Te0.66 QDs; (b) absorption-energy onset related to Te content; (c) emission peak-wavelength versus Te content.


Zunger et al. (6,7) suggest the observed effects arise because of: (a) the various ionic sizes in the alloy; (b) the various electronegativities
'"/>

Source:


Page: All 1 2 3 4

Related biology technology :

1. Improved Quantitative Selectivity of Clenbuterol in Human Urine using High Resolution on the TSQ Quantum Mass Spectrometer
2. Bioanalytical Method Intraday Validation for the Quantitation of Paroxetine in Bovine Plasma using the TSQ Quantum Mass Spectrometer
3. Quantitation of Acrylamide in Food Samples on the Finnigan TSQ Quantum Discovery by LC/APCI-MS/MS
4. Increased Analyte Sensitivity through the Utility of Enhanced Mass-Resolution on the FinniganTSQ Quantum Discovery
5. FluoroMax multiwavelength capability
Post Your Comments:
(Date:7/11/2014)... , July 11, 2014 EPFL ... announce the appointment of John P. Donoghue . ...   in  Geneva . The new ... Biotech in Geneva , has named ... neuroscientists. John P. Donoghue , founder of Brown ...
(Date:7/10/2014)... 10, 2014 Product and process ... low abundance and are often “lost in the ... , Join presenters Dr. Rowel Tobias, Senior Scientist, ... Anders, Head of Quality at Nanotherapeutics, Inc., to ... can speed detection and quantitation while achieving the ...
(Date:7/10/2014)... Poway, CA (PRWEB) July 10, 2014 Robert ... Regenerative Veterinary Medicine company, is proud to announce the relaunch ... Pets, launching with a new series called “ What are ... to give an honest and straightforward foundation in the basics ... an educated decision on the right type of treatment when ...
(Date:7/10/2014)... , July 10, 2014 ... Dmitry Medvedev , presented Russia,s ... BIOCAD . The Company is developing a unique ... MabNext project BIOCAD develops a number of innovative drugs ... autoimmune diseases. The ceremony took place at the International ...
Breaking Biology Technology:John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 2John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 3Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 2Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 3Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2
... Wis. - After months of debate and restructuring Gov. ... - at the expense of the Biomedical Technology Alliance ... exercising a partial veto on a proposed grant of $2.5 ... investors located in southeastern Wisconsin. The partial veto will cut ...
... BIO 2005 meeting in Philadelphia last month, the globalization of ... flight. The company that perhaps best chronicles and tracks this ... biotechnology. , ,This report is usually released and previewed at ... appropriate title Beyond Borders: Global Biotechnology Report 2005, is a ...
... two-year state budget signed into law Monday by Gov. ... Wisconsin technology firms by changing how corporate income from ... Technology Council. , ,With bipartisan support from the ... factor" sales apportionment for corporate income to technology and ...
Cached Biology Technology:Doyle partially vetoes SE Wisconsin technology grant 2Doyle partially vetoes SE Wisconsin technology grant 3Globalization of biotech industry is a decidedly worldwide phenomenon 2Globalization of biotech industry is a decidedly worldwide phenomenon 3`Single-sales factor' extends tax treatment to tech, service firms 2`Single-sales factor' extends tax treatment to tech, service firms 3
(Date:7/11/2014)... Researchers from Ume University, Sweden, have explored two ... the reaction sequence leading to the formation of ... been published in the scientific journal Nature ... improving present day synthetic catalysts for water oxidation, ... devices for the direct storage of solar energy ...
(Date:7/11/2014)... the normal circumstances, astrocytes participate in normal ... and exhibit therapeutic and repairing effects on ... have found that nerve cells differentiated from ... reduced viability, which produces influences on subsequent ... General Hospital, Hebei United University, China demonstrated ...
(Date:7/10/2014)... and other major cities in New Mexico, nearly every ... wastewater rather than precious potable water supplies. Across the ... all golf courses receive treated effluent. Reusing the effluent ... golf courses and homeowners alike fertilize their lawns during ... nitrate. A New Mexico State University turfgrass expert has ...
Breaking Biology News(10 mins):Molecular snapshots of oxygen formation in photosynthesis 2'Tailored' water -- the latest in lawn care 2
... to find the necessities of life. It,s a complex task, ... environment to navigate the safest and fastest routes to food ... certain important events, such as finding a meal, will occur. ... fundamental behaviors, navigation and the anticipation of a reward, had ...
... /PRNewswire-iReach/ -- IdentiSys Inc., North America,s ... emergency response, and access control security systems, today announced ... in Customer and Patient Experience Management systems. IdentiSys will ... to the marketplace and will be the only North ...
... re-growing tropical forests has concluded that plant biodiversity takes ... such as clearance for farming. The findings, ... Royal Society B , have important implications for conservation ... and Central America. The new study is the first ...
Cached Biology News:Anticipation and navigation: Do your legs know what your tongue is doing? 2Anticipation and navigation: Do your legs know what your tongue is doing? 3Anticipation and navigation: Do your legs know what your tongue is doing? 4IdentiSys brings Qmatic Q-Guide Queuing Systems to the North American market 2IdentiSys brings Qmatic Q-Guide Queuing Systems to the North American market 3Carbon storage recovers faster than plant biodiversity in re-growing tropical forests 2
IMAGEQUANT 100 IQTL, 1 EA. Category: ImageQuant CCD Imagers....
Request Info...
RayBio Human Cytokine Antibody Array 1.1 (4 array membranes) with Accessory, detects 20 cytokines (for lysate) Class: Antibody Array Products Product Group: Antibody Array...
...
Biology Products: