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Synthesis and down-conversion luminescence investigation of CaF2:Yb:Ce powders for photonics
SV Kuznetsov, AS Nizamutdinov, MN Mayakova… - Journal of Fluorine …, 2019 Abstract Single-phase solid solutions based on calcium fluoride doped with ytterbium and cerium trivalent ions were synthesized by co-precipitation from aqueous solutions. According to scanning...
Customer Spotlight: HortLED Develops LED Grow Lights for Commercial Growers with aid of a BLUE-Wave Spectrometer
HortLED is introducing the ARC 600, a scientifically developed LED grow light designed for commercial cultivation. “Commercial growers tend to focus on two points when selecting new lighting,” says Alex Bodell, founder of HortLED, “Plant...
Photonics West 2019 Review – New StellarNet Spectrometer Products and Features
Earlier this month, StellarNet, Inc. revealed a variety of awesome new spectrometer products and features at the Photonics West conference in San Francisco Feb 2-7. Get your popcorn ready and watch some of our exciting updates which include SpectraWiz...
Spectroscopy of Gemstones- Is a Diamond Forever?
Tis the Season! A Diamond is Forever? You’re about to ask the biggest question of your life, on one knee, in front of her entire family, on Christmas Eve. You’re nervous. Your mind starts to go to the dark places… Are you sure that sparkly rock...
Introduction to Surface Enhanced Raman Spectroscopy (SERS) Part 1
Overview:Last month’s technical note titled “Raman Fundamentals for Miniature Spectrometers” introduced the physical principals of Raman spectroscopy and typical experimental set-ups. One crucial topic not discussed in that article was the...
Modulation of halotropic growth in rough bluegrass (Poa trivialis L.) by flavonoids and light
DP Petrella, EH Han, EJ Nangle, JC Scheerens… - … and Experimental Botany, 2018 Abstract Halotropism is a form of adaptive directional growth in which roots grow away from areas of high salt concentrations. Halotropism is thought to function in cooperation with the...
Spectroscopic investigation of Tb(tmhd)3 – Eu(tmhd)3 co-doped poly(methyl methacrylate) fibre
P Miluski, M Kochanowicz, J Zmojda, T Ragin… - Optical Materials, 2018 Abstract The article presents energy transfer observed in poly (methyl methacrylate) co-doped by trivalent terbium and europium ions. The measured spectra and terbium luminescence decay changes...
Simple remote sensing detection of Corymbia calophylla flowers using common 3 –band imaging sensors
T Campbell, P Fearns - Remote Sensing Applications: Society and …, 2018 Abstract With Apis mellifera (the European Honey Bee) having an average forage radius of less than one kilometre from their hive, selecting the best location for beehives is critical for...
Thanksgiving Application Note: Predicting Fat Content in Turkey using NIR Spectroscopy
Why Turkey on Thanksgiving? These tasty birds are large enough that they can feed a table full of hungry family, and unlike chickens or cows, they don't serve much utilitarian purpose like laying eggs or making milk. Since the turkey is native...
Technical Note – Raman Fundamentals for Miniature Spectrometers
Raman Spectroscopy in the Classroom Using Raman Spectroscopy to Detect Art Forgeries Exploring Chemical Bonding Using Raman Spectroscopy Modular Raman Systems View Sample Spectra 532 – 785 – 1064 Portable Analyzers StellarCASE-Raman ...
Customer Spotlight: StellarNet partners with Brewmetrix to create an in-house QC device for brewers
Bringing the QC Lab into the Brewery Brewmetrix is on a mission to eliminate the hassle and chemicals involved in the quality control (QC) of the brewing process. “The vision is to have a chemical-free QC lab inside the brewery,” said VP of...
The Importance of Calibrated Uniform Light Sources in Imaging Array Quality Control
StellarNet, Inc. Tampa, Fl USA 10/15/2018 Array Detector Defects and Nonuniformities: All array detectors, both 1D and 2D, will inevitably suffer from defects and pixel-to-pixel nonuniformities due to the limitations of high-volume semiconductor manufacturing...
NIR Customer Spotlight- Jadavpur University predicts total polyphenol in Tea using near-infrared spectroscopy
The quality of tea liquor primarily depends on the quality of inbound fresh leaves to a tea factory. Several researchers at the Tocklai Tea Research Institute and Jadavpur University are working in close collaboration to develop NIR prediction methodologies of a few...
Predicting composition of shelled corn (Zea mays) – A Feasibility Study with the StellarCASE-NIR Near-Infrared Analyzer
Introduction If you’ve driven through the mid-western United States, you’ll have noticed that corn is an important and prevalent crop. Corn covers about 90 million acres of farmland in the U.S. and accounts for about two-thirds of global grain trade. The food,...
Customer Spotlight – Zoological Lighting Institute
The Zoological Lighting Institute maintains a mission to support photobiology research for animal husbandry and wildlife conservation purposes. “Animal care depends on good science, and good science is produced by data driven by proper measurements....
A New Color Fidelity Index for LED and Light Measurement- TM-30-15
Keeping Track of Color: The International Commission on Illumination (CIE) is the worldwide recognized source for standards in illumination who, in 1965, published the Color Rendering Index (CRI) and the general color rendering index, Ra, for assessing the color...
LED Measurement at DelphiTech – Customer Spotlight
Quality Control for LED Products with StellarNet SpectroRadiometers A StellarNet SpectroRadiometer enables DelphiTech to ensure quality, quantify new products and analyze competitive products. Rodney McInnis, CEO of DelphiTech, has been manufacturing...
Simple remote sensing detection of Corymbia calophylla flowers using common 3 –band imaging sensors
T Campbell, P Fearns - Remote Sensing Applications: Society and …, 2018 Abstract With Apis mellifera (the European Honey Bee) having an average forage radius of less than one kilometre from their hive, selecting the best location for beehives is critical for...
Intra-class variability in diffuse reflectance spectroscopy: application to porcine adipose tissue
F Fanjul-Vélez, L Arévalo-Díaz, JL Arce-Diego - Biomedical Optics Express, 2018 Abstract Optical diffuse reflectance spectroscopy (DRS) has great potential in the study, diagnosis, and discrimination of biological tissues. Discrimination is based on massive...
The impact on the performance of a PV module as a result of the encapsulant fluorescence induced by weathering
BT Hamzavy, Southern Research Institute, Birmingham, AL 35211 USA Abstract The electrical performance of a 4.0 kW mono crystalline modules is characterized in terms of encapsulant transmission and fluorescence. These modules have been installed in a grid-connected...
Electroluminescent Pressure-Sensing Displays
SW Lee, SH Cho, HS Kang, G Kim, JS Kim, B Jeong… - ACS Applied Materials & …, 2018 Abstract Simultaneous sensing and visualization of pressure provides a useful platform to obtain information about a pressurizing object, but the fabrication of such interactive...
Up-conversion luminescence in low phonon heavy metal oxide glass co-doped with Er3+/Ho3+ ions
T Ragiń, A Baranowska, M Sołtys, A Górny, J Zmojda… - Photonics Letters of Poland, 2018 Abstract In this paper, heavy metal oxide glasses co-doped with erbium and holmium ions have been synthesized. Glass composition, based on bismuth and germanium oxides, has been...
Exploring Conditions for Ultrafine Particle Formation from Oxidation of Cigarette Smoke in Indoor Environments
C Wang, DB Collins, RF Hems, N Borduas-Dedekind… - Environmental Science & …, 2018 Department of Chemistry, University of Toronto Abstract Cigarette smoke is an important source of particles and gases in the indoor environment. In this work, aging of side-stream...
THERMOGRAVIMETRIC APPROACH FOR ASSESSING THE OXIDATION LEVEL OF A BIODIESEL SAMPLE
L Díaz-Ballotea, K Gómez-Hernándeza… Department of Applied Physics, Center for Research and Advanced Studies of the National Polytechnic Institute, A. P. 73 Cordemex, Mérida, Yucatá Abstract Biodiesel, unlike diesel, is highly susceptible to autoxidation. This...
The effect of biostimulants on the yield and quality of broccoli heads during storage
A Kałużewicz, T Spiżewski, W Krzesiński, A Zaworska - Nauka Przyroda Technologie Department of Vegetable Crops Poznań University of Life Sciences Abstract Background. Biostimulants are widely used in horticulture to increase yield and improve its quality as well as...
AlGaAs-based vertical-external-cavity surface-emitting laser exceeding 4 W of direct emission power in the 740–790 nm spectral range
Hermann Kahle, Kostiantyn Nechay, Jussi-Pekka Penttinen, Antti Tukiainen, Sanna Ranta, and Mircea Guina Abstract An optically pumped vertical-external-cavity surface-emitting laser (VECSEL) for direct emission in the 740–790 nm wavelength region is reported. The gain...
Applicability of samarium(III) complexes for the role of luminescent molecular sensors for monitoring progress of photopolymerization processes and control of the thickness of polymer coatings
M Topa, J Ortyl, A Chachaj-Brekiesz, I Kamińska-Borek… - Spectrochimica Acta Part A …, 2018 Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Cracow, Poland...
Strongly Iridescent Hybrid Photonic Sensors Based on Self-Assembled Nanoparticles for Hazardous Solvent Detection
Ayaka Sato, Yuya Ikeda, Koichi Yamaguchi and Varun Vohra - Nanomaterials 2018 Abstract Facile detection and the identification of hazardous organic solvents are essential for ensuring global safety and avoiding harm to the environment caused by industrial wastes....
SpectroElectrochemistry Lab: Redox Titration of Ferricyanide to Ferrocyanide with Ascorbic Acid
While spectroscopy is often used to directly quantify compounds in solution it can also help you measure and calculate other chemical properties. In this experiment, you will use visible spectroscopy to help measure the standard reduction potential for...
Temperature sensitivity modulation through crystal field engineering in Ga3+ co-doped Gd3Al5-xGaxO12:Cr3+, Nd3+ nanothermometers
K Elzbieciak, A Bednarkiewicz, L Marciniak - Sensors and Actuators B: Chemical, 2018 Abstract Luminescent nanothermometry (LNT) based on temperature-dependent emission intensity of transition metals (TM) is a promising new direction to enhance the performance and...
Synthesis and luminescence studies of CaF2:Yb:Pr solid solutions powders for photonics
SV Kuznetsov, OA Morozov, VG Gorieva… - Journal of Fluorine Chemistry 2018- Optics Letters, 2018 Abstract Praseodymium and ytterbium-doped calcium fluoride powder samples were prepared by co-precipitation from aqueous solutions followed by annealing at 600 °C. Phase...
AlGaAs-based vertical-external-cavity surface-emitting laser exceeding 4 W of direct emission power in the 740–790 nm spectral range
H Kahle, K Nechay, JP Penttinen, A Tukiainen, S Ranta… - Optics Letters, 2018 Abstract An optically pumped vertical-external-cavity surface-emitting laser (VECSEL) for direct emission in the 740–790 nm wavelength region is reported. The gain structure is based on 12...
Ultrafast dynamics in co-sensitized photocatalysts under visible and NIR light irradiation
J Patwari, A Chatterjee, S Sardar, P Lemmens, SK Pal - Physical Chemistry Chemical …, 2018 Abstract Co-sensitization to achieve a broad absorption window is a widely accepted technique in light harvesting nanohybrid synthesis. Protoporphyrin (PPIX) and squaraine (SQ2)...
Facile method to immobilize ZnO particles on glass spheres for the photocatalytic treatment of tannery wastewater
V Vaiano, G Iervolino - Journal of Colloid and Interface Science, 2018 Abstract In order to apply the photocatalytic processes on a real scale for the treatment of industrial wastewaters, the use of slurry reactors employing suspended photocatalysts is not suitable...
Partial photochemical oxidation was a dominant fate of Deepwater Horizon surface oil
Collin P. Ward, Charles M. Sharpless, David L. Valentine, Deborah P. French-McCay, Christoph Aeppli, Helen K. White, Ryan P. Rodgers, Kelsey M. Gosselin, Robert K. Nelson, and Christopher M. Reddy - Environmental Science & Technology 2018 52 (4), 1797-1805...
Example Raman Lab: Exploring Chemical Bonding Using Raman Spectroscopy
In the previous experiments, you were introduced to visible and fluorescence spectroscopy. You learned that different molecules absorb and emit different wavelengths of light and that you can characterize molecules based on these patterns. Now you will...
Engineering an E. coli Near-Infrared Light Sensor
NTX Ong, EJ Olson, JJ Tabor - ACS Synthetic Biology, 2017 Abstract Optogenetics is a technology wherein researchers combine light and genetically engineered photoreceptors to control biological processes with unrivaled precision. Near-infrared (NIR) wavelengths...
Cd-free quantum dot pellets for efficient white light generation
Y Altintas, MY Talpur, E Mutlugün - Optics Express, 2017 Abstract Semiconductor quantum dots have been on demand for niche optoelectronic applications providing color tenability and possessing high quantum yield and high extinction coefficient. Although the...
Development of a Spectrophotometric Method for Determining pH of Soil Extracts and Comparison with Glass Electrode Measurements
S Bargrizan, RJ Smernik, LM Mosley - Soil Science Society of America Journal, 2017 Abstract Soil pH measurement using conventional glass electrodes has several limitations. A spectrophotometric method was developed for determining soil pH involving indicator dye...
Homeostatic plasticity shapes the visual system’s first synapse
RE Johnson, NW Tien, N Shen, JT Pearson, F Soto… - Nature Communications, 2017 Abstract Vision in dim light depends on synapses between rods and rod bipolar cells (RBCs). Here, we find that these synapses exist in multiple configurations, in which single release sites...