scholarly journals Anisometric Ln(III) Complexes with Efficient Near-IR Luminescence

Inorganics ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 9
Author(s):  
Andrey A. Knyazev ◽  
Aleksandr S. Krupin ◽  
Yuriy G. Galyametdinov
Keyword(s):  
Near Infrared ◽  
Emission Spectra ◽  
Structural Features ◽  
Infrared Range ◽  
Light Emitting ◽  
Near Ir ◽  
Re Elements ◽  
Stokes Shifts ◽  
Narrow Emission

Recent studies in development of near-infrared luminophores focus on overcoming their disadvantages such as low quantum efficiency, limited emission power, and broad emission spectra. Rare earth (RE) elements are promising compounds in this respect as they offer a unique set of optical properties that provide narrow emission spectra and large Stokes shifts. This work reports the results of synthesis and characterization of new anisometric complexes of lanthanide(III) tris(b-diketonates) and 1,10-phenanthroline. These complexes possess light emitting-properties in the near-infrared range. Due to their structural features, these complexes allow production of homogeneous films by spin coating. These films are transparent in the visible and near-infrared ranges (transmission up to 99%). This paper demonstrates advantages of Yb(III), Er(III), and Nd(III) complexes as potential components of highly efficient light-transforming NIR coatings.

scholarly journals Characterization of conichalcite by SEM, FTIR, Raman and electronic reflectance spectroscopy

2005 ◽  
Vol 69 (2) ◽  
pp. 155-167 ◽  
Author(s):  
B. J. Reddy ◽  
R. L. Frost ◽  
W. N. Martens
Keyword(s):  
Near Infrared ◽  
Adsorbed Water ◽  
Reflectance Spectroscopy ◽  
Sem Images ◽  
X Ray ◽  
Near Ir ◽  
Ir Reflectance ◽  
Yavapai County ◽  
Ir Bands

AbstractThe mineral conichalcite from the western part of Bagdad mine, Bagdad, Eureka District, Yavapai County, Arizona, USA has been characterized by electronic, near-infrared (NIR), Raman and infrared (IR) spectroscopy. Scanning electron microscopy (SEM) images show that the mineral consists of bundles of fibres. Calculations based on the results of the energy dispersive X-ray analyses on a stoichiometric basis show the substitution of arsenate by 12 wt.% of phosphate in the mineral. Raman and IR bands are assigned in terms of the fundamental modes of AsO43− and PO43− molecules and are related to the mineral structure. Near-IR reflectance spectroscopy shows the presence of adsorbed water and hydroxyl units in the mineral. The Cu(II) coordination polyhedron in conichalcite can have at best pseudo-tetragonal geometry. The crystal field and tetragonal field parameters of the Cu(II) complex were calculated and found to agree well with the values reported for known tetragonal distortion octahedral complexes.

scholarly journals Luminescence of SiO2-BaF2:Tb3+, Eu3+ Nano-Glass-Ceramics Made from Sol–Gel Method at Low Temperature

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 259
Author(s):  
Natalia Pawlik ◽  
Barbara Szpikowska-Sroka ◽  
Tomasz Goryczka ◽  
Ewa Pietrasik ◽  
Wojciech A. Pisarski
Keyword(s):  
Sol Gel ◽  
Three Dimensional ◽  
Glass Ceramics ◽  
Emission Spectra ◽  
Scanning Calorimetry ◽  
Light Emitting ◽  
Co Doping ◽  
Dsc Measurements ◽  
Decay Times

The synthesis and characterization of multicolor light-emitting nanomaterials based on rare earths (RE3+) are of great importance due to their possible use in optoelectronic devices, such as LEDs or displays. In the present work, oxyfluoride glass-ceramics containing BaF2 nanocrystals co-doped with Tb3+, Eu3+ ions were fabricated from amorphous xerogels at 350 °C. The analysis of the thermal behavior of fabricated xerogels was performed using TG/DSC measurements (thermogravimetry (TG), differential scanning calorimetry (DSC)). The crystallization of BaF2 phase at the nanoscale was confirmed by X-ray diffraction (XRD) measurements and transmission electron microscopy (TEM), and the changes in silicate sol–gel host were determined by attenuated total reflectance infrared (ATR-IR) spectroscopy. The luminescent characterization of prepared sol–gel materials was carried out by excitation and emission spectra along with decay analysis from the 5D4 level of Tb3+. As a result, the visible light according to the electronic transitions of Tb3+ (5D4 → 7FJ (J = 6–3)) and Eu3+ (5D0 → 7FJ (J = 0–4)) was recorded. It was also observed that co-doping with Eu3+ caused the shortening in decay times of the 5D4 state from 1.11 ms to 0.88 ms (for xerogels) and from 6.56 ms to 4.06 ms (for glass-ceramics). Thus, based on lifetime values, the Tb3+/Eu3+ energy transfer (ET) efficiencies were estimated to be almost 21% for xerogels and 38% for nano-glass-ceramics. Therefore, such materials could be successfully predisposed for laser technologies, spectral converters, and three-dimensional displays.

Electrochromic properties of novel octa-pinene substituted double-decker Ln(iii) (Ln = Eu, Er, Lu) phthalocyanines with distinctive near-IR absorption

2015 ◽  
Vol 3 (13) ◽  
pp. 3072-3080 ◽  
Author(s):  
Wei Zheng ◽  
Bei-Bei Wang ◽  
Jian-Cheng Lai ◽  
Cheng-Zhang Wan ◽  
Xin-Rong Lu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Near Infrared ◽  
External Potential ◽  
Infrared Range ◽  
Ir Absorption ◽  
Electrochromic Properties ◽  
Near Ir ◽  
Double Decker ◽  
Spectral And Electrochemical Properties ◽  
Near Infrared Range

The introduction of pinene groups into lanthanide(iii) double-decker phthalocyanines results in excellent solubility as well as nontrivial spectral and electrochemical properties. Upon external potential, the new lanthanide(iii) double-decker phthalocyanine complexes show electrochromic properties at both visible and near infrared range.

Characterization of Thin-film Thermoelectric Micro-modules using Transient Harman ZT Measurement and Near-IR Thermoreflectance

2007 ◽  
Vol 1044 ◽  
Author(s):  
Rajeev Singh ◽  
James Christofferson ◽  
Zhixi Bian ◽  
Joachim Nurnus ◽  
Axel Schubert ◽  
...  
Keyword(s):  
Thin Film ◽  
Heat Load ◽  
Figure Of Merit ◽  
Near Infrared ◽  
Device Performance ◽  
Metal Contacts ◽  
Thermoelectric Figure ◽  
Near Ir ◽  
Harman Technique

AbstractWe characterize several thin film thermoelectric micro-modules composed of 20 µm-thick elements and designed for cooling applications to identify factors that may limit device performance. Thermoelectric figure-of-merit measurements using the transient Harman technique are compared with maximum cooling data under no heat load. Correlation between the two measurements depending on the location of the parasitic joule heating in the module is analyzed. Near-infrared thermoreflectance is used to examine temperature non-uniformity in the module. The temperature distribution on the metal contacts due to the Peltier and Joule effects is obtained non-destructively through the silicon substrate of an active module.

Bioconjugates of Luminescent CdSe-ZnS Quantum Dots with Engineered Recombinant Proteins: Novel Self-Assembled Tools for Biosensing

2000 ◽  
Vol 642 ◽  
Author(s):  
Ellen R. Goldman ◽  
Hedi Mattoussi ◽  
Phan T. Tran ◽  
George P. Anderson ◽  
J. Matthew Mauro
Keyword(s):  
Quantum Dots ◽  
Recombinant Proteins ◽  
Self Assembly ◽  
Emission Spectra ◽  
Igg Antibody ◽  
Photo Degradation ◽  
Size Dependent ◽  
Near Ir ◽  
Wide Range

ABSTRACTColloidal semiconductor quantum dots (QDs) are luminescent nanoparticles with size- dependent emission spectra spanning a wide range of wavelengths in the visible and near IR. This property, as well as their higher resistance to photo-degradation compared to organic dye labels, makes QDs potentially suitable for certain biomolecule tagging and multiplexing applications. We describe an electrostatic self-assembly approach for conjugating highly luminescent colloidal CdSe-ZnS core-shell QDs with engineered two-domain recombinant proteins to form conjugates for sensing and imaging applications. The design, preparation, and characterization of high quantum yield IgG antibody-binding protein G bioconjugates using luminescence, electrophoretic gel shift, and affinity assays is reported.

Spectroscopy with a Light Optical Microscope

2012 ◽  
Vol 21 (1) ◽  
pp. 22-26
Author(s):  
Paul Martin
Keyword(s):  
Near Infrared ◽  
Emission Spectra ◽  
Infrared Region ◽  
Optical Microscope ◽  
Infrared Range ◽  
Molecular Spectra ◽  
Light Optical Microscope ◽  
Deep Ultraviolet ◽  
Uv Visible ◽  
Near Infrared Range

The microspectrophotometer can be described as a type of hyphenated instrument: it is a hybrid that combines the magnifying power of a light microscope with a UV-visible-NIR (ultraviolet–visible–near infrared) range spectrophotometer. These instruments are used to measure the molecular spectra from microscopic samples, from the deep ultraviolet to the near infrared region. Microspectrophotometers can be configured in many different ways and used to measure absorbance, reflectance, and even emission spectra, such as fluorescence, of sub-micron-sized sample areas. With the addition of specialized algorithms, the microspectrophotometer can also be used to measure the thickness of thin films or to act as a colorimeter for microscopic samples.

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