Near-infrared and visible luminescence and absorption spectroscopy of low-coordinate organometallic rhenium compounds

1996 ◽  
Vol 74 (1) ◽  
pp. 28-31
Author(s):  
Carole Savoie ◽  
Christian Reber
Keyword(s):  
Low Temperature ◽  
Near Infrared ◽  
Organic Ligands ◽  
Luminescence Spectra ◽  
Relaxation Processes ◽  
Nonradiative Relaxation ◽  
Visible Luminescence ◽  
Infrared Spectral ◽  
Absorption And Luminescence Spectra ◽  
Stokes Shifts

Low-temperature absorption and luminescence spectra of four organorhenium compounds were measured in the visible and near-infrared spectral regions. Effects of the temperature, formal oxidation state, and the oxo-, bromo-, and organic ligands on the metal center are reported. The emission maxima of the four compounds show a large variation between 9000 and 14 200 cm−1. Stokes shifts show a smaller variation from 3700 to 4200 cm−1. Luminescence intensities are used to qualitatively characterize nonradiative relaxation processes. Key words: luminescence spectra, absorption spectra, organorhenium compounds.

scholarly journals Fluoroindate glasses co-doped with Pr3+/Er3+ for near-infrared luminescence applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Wojciech A. Pisarski ◽  
Joanna Pisarska ◽  
Marta Kuwik ◽  
Marcin Kochanowicz ◽  
Jacek Żmojda ◽  
...  
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Nonradiative Relaxation ◽  
Transfer Processes ◽  
Direct Excitation ◽  
Infrared Luminescence ◽  
Doped Glass ◽  
Co Doped

AbstractFluoroindate glasses co-doped with Pr3+/Er3+ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths. For the Pr3+/Er3+ co-doped glass samples several radiative and nonradiative relaxation channels and their mechanisms are proposed under direct excitation of Pr3+ and/or Er3+. The energy transfer processes between Pr3+ and Er3+ ions in fluoroindate glasses were identified. In particular, broadband near-infrared luminescence (FWHM = 278 nm) associated to the 1G4 → 3H5 (Pr3+), 1D2 → 1G4 (Pr3+) and 4I13/2 → 4I15/2 (Er3+) transitions of rare earth ions in fluoroindate glass is successfully observed under direct excitation at 483 nm. Near-infrared luminescence spectra and their decays for glass samples co-doped with Pr3+/Er3+ are compared to the experimental results obtained for fluoroindate glasses singly doped with rare earth ions.

Room Temperature Infrared Electroluminescence from Thin-Film Polycrystalline Chalcopyrite Cu(In,Ga)Se2-Based Diodes

1995 ◽  
Vol 378 ◽  
Author(s):  
Miguel A. Contreras ◽  
John Webb ◽  
Andrew Tennant ◽  
Rommel Noufi
Keyword(s):  
Thin Film ◽  
Room Temperature ◽  
Near Infrared ◽  
Luminescence Spectra ◽  
Polycrystalline Thin Films ◽  
Curve Fit ◽  
Device Structures ◽  
Infrared Spectral ◽  
Relationship Of ◽  
Ft Raman

AbstractEvidence of room-temperature infrared electroluminescence from thin-film polycrystalline CuInxGa1-xSe2-based diodes (0<×<0.4) has been observed by Fourier transform spectroscopy using a FT-Raman spectrophotometer that operates in the near-infrared spectral region. Electroluminescence spectra from ternary CuInSe2 and quaternary Cu(In,Ga)Se2 device structures are reported. In all electroluminescence cases we observe an approximate linear relationship of intensity to forward junction current. Film fabrication process determines to a great extent the optoelectronic properties of the emitters, and consequently, the characteristics of their luminescence spectra. Using a Gaussian multi-peak curve-fit routine to analyze electroluminescence spectra, we can deduce the position, width and relative intensity of the dominant optical transitions. Our purpose in this contribution is two-fold: (1) To report the room-temperature electroluminescence phenomena from chalcopyrite Cu(In,Ga)Se2 polycrystalline thin-films, and (2) to demonstrate electroluminescence as a viable technique to optically characterize Cu(In,Ga)Se2 materials using diode structures at RT.

scholarly journals Fluoroindate Glass Co-Doped with Yb3+/Ho3+ as a 2.85 μm Luminescent Source for MID-IR Sensing

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2155
Author(s):  
Marcin Kochanowicz ◽  
Jacek Zmojda ◽  
Agata Baranowska ◽  
Marta Kuwik ◽  
Bartłomiej Starzyk ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Luminescence Spectra ◽  
Infrared Source ◽  
Mid Infrared ◽  
Infrared Luminescence ◽  
Infrared Spectral Range ◽  
Infrared Spectral ◽  
Sensing Application ◽  
Co Doped

This work reports on the fabrication and analysis of near-infrared and mid-infrared luminescence spectra and their decays in fluoroindate glasses co-doped with Yb3+/Ho3+. The attention has been paid to the analysis of the Yb3+→ Ho3+ energy transfer processed ions in fluoroindate glasses pumped by 976 nm laser diode. The most effective sensitization for 2 μm luminescence has been obtained in glass co-doped with 0.8YbF3/1.6HoF3. Further study in the mid-infrared spectral range (2.85 μm) showed that the maximum emission intensity has been obtained in fluoroindate glass co-doped with 0.1YbF3/1.4HoF3. The obtained efficiency of Yb3+→ Ho3+ energy transfer was calculated to be up to 61% (0.8YbF3/1.6HoF3), which confirms the possibility of obtaining an efficient glass or glass fiber infrared source for a MID-infrared (MID-IR) sensing application.

Metastructures for the Giant Enhancement of Raman Scattering in the Near Infrared Spectral Range

JETP Letters ◽  
2020 ◽  
Vol 112 (1) ◽  
pp. 31-36
Author(s):  
V. I. Kukushkin ◽  
V. E. Kirpichev ◽  
E. N. Morozova ◽  
V. V. Solov’ev ◽  
Ya. V. Fedotova ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Spectral Range ◽  
Near Infrared ◽  
Infrared Spectral Range ◽  
Infrared Spectral

scholarly journals ALD Deposited ZnO:Al Films on Mica for Flexible PDLC Devices

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1011
Author(s):  
Dimitre Z. Dimitrov ◽  
Zih Fan Chen ◽  
Vera Marinova ◽  
Dimitrina Petrova ◽  
Chih Yao Ho ◽  
...  
Keyword(s):  
Near Infrared ◽  
Atomic Layer ◽  
Optical Transmittance ◽  
Force Microscopy ◽  
Flexible Polymer ◽  
Layer Deposition ◽  
Polymer Dispersed ◽  
Muscovite Mica ◽  
Infrared Spectral ◽  
Continuous Bending

In this work, highly conductive Al-doped ZnO (AZO) films are deposited on transparent and flexible muscovite mica substrates by using the atomic layer deposition (ALD) technique. AZO-mica structures possess high optical transmittance at visible and near-infrared spectral range and retain low electric resistivity, even after continuous bending of up to 800 cycles. Structure performances after bending tests have been supported by atomic force microscopy (AFM) analysis. Based on performed optical and electrical characterizations AZO films on mica are implemented as transparent conductive electrodes in flexible polymer dispersed liquid crystal (PDLC) devices. The measured electro-optical characteristics and response time of the proposed devices reveal the higher potential of AZO-mica for future ITO-free flexible optoelectronic applications.

scholarly journals Phenotypic and genetic variation of ultraviolet–visible-infrared spectral wavelengths of bovine meat

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Giovanni Bittante ◽  
Simone Savoia ◽  
Alessio Cecchinato ◽  
Sara Pegolo ◽  
Andrea Albera
Keyword(s):  
Meat Quality ◽  
Genetic Improvement ◽  
Near Infrared ◽  
Infrared Region ◽  
Phenotypic Variance ◽  
Quality Traits ◽  
Meat Quality Traits ◽  
Infrared Spectral ◽  
Portable Spectrometers ◽  
Absorbance Spectra

AbstractSpectroscopic predictions can be used for the genetic improvement of meat quality traits in cattle. No information is however available on the genetics of meat absorbance spectra. This research investigated the phenotypic variation and the heritability of meat absorbance spectra at individual wavelengths in the ultraviolet–visible and near-infrared region (UV–Vis-NIR) obtained with portable spectrometers. Five spectra per instrument were taken on the ribeye surface of 1185 Piemontese young bulls from 93 farms (13,182 Herd-Book pedigree relatives). Linear animal model analyses of 1481 single-wavelengths from UV–Vis-NIRS and 125 from Micro-NIRS were carried out separately. In the overlapping regions, the proportions of phenotypic variance explained by batch/date of slaughter (14 ± 6% and 17 ± 7%,), rearing farm (6 ± 2% and 5 ± 3%), and the residual variances (72 ± 10% and 72 ± 5%) were similar for the UV–Vis-NIRS and Micro-NIRS, but additive genetics (7 ± 2% and 4 ± 2%) and heritability (8.3 ± 2.3% vs 5.1 ± 0.6%) were greater with the Micro-NIRS. Heritability was much greater for the visible fraction (25.2 ± 11.4%), especially the violet, blue and green colors, than for the NIR fraction (5.0 ± 8.0%). These results allow a better understanding of the possibility of using the absorbance of visible and infrared wavelengths correlated with meat quality traits for the genetic improvement in beef cattle.

Comparison of Techniques for Prediction of Mechanical Strength of Firefighters’ Protective Clothing Using Near-Infrared Spectral Data

2021 ◽  
Author(s):  
Henry U. Ohalele ◽  
Mackenzie Fulton ◽  
David A. Torvi ◽  
Scott D. Noble ◽  
Jane C. Batcheller
Keyword(s):  
Mechanical Strength ◽  
Spectral Data ◽  
Protective Clothing ◽  
Near Infrared ◽  
Infrared Spectral ◽  
Comparison Of Techniques

Parametric handheld optical probe (HOPE) for biological tissue characterization in the near-infrared spectral range

2021 ◽  
pp. 127076
Author(s):  
Daniel Davidov ◽  
David Shemesh ◽  
Ofira Einstein ◽  
David Abookasis
Keyword(s):  
Spectral Range ◽  
Biological Tissue ◽  
Tissue Characterization ◽  
Near Infrared ◽  
Optical Probe ◽  
Infrared Spectral Range ◽  
Infrared Spectral

Absorption and luminescence spectra of amorphous CdI2 thin films

1999 ◽  
Vol 101-103 ◽  
pp. 299-302 ◽  
Author(s):  
Kazutoshi Fukui ◽  
Kenji Asakura ◽  
Ken-ichi Niimi ◽  
Ikuto Ishizue ◽  
Hideyuki Nakagawa
Keyword(s):  
Thin Films ◽  
Luminescence Spectra ◽  
Absorption And Luminescence Spectra

scholarly journals Biomechanical, biochemical, and near infrared spectral data of bovine knee ligaments and patellar tendon

Data in Brief ◽  
2021 ◽  
Vol 36 ◽  
pp. 106976
Author(s):  
Aapo Ristaniemi ◽  
Jari Torniainen ◽  
Tommi Paakkonen ◽  
Lauri Stenroth ◽  
Mikko A.J. Finnilä ◽  
...  
Keyword(s):  
Spectral Data ◽  
Patellar Tendon ◽  
Near Infrared ◽  
Knee Ligaments ◽  
Infrared Spectral
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