Infrared luminescence properties of bismuth-doped barium silicate glasses

2007 ◽  
Vol 22 (7) ◽  
pp. 1954-1958 ◽  
Author(s):  
Jinjun Ren ◽  
Jianrong Qiu ◽  
Danping Chen ◽  
Chen Wang ◽  
Xiongwei Jiang ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Room Temperature ◽  
Full Width Half Maximum ◽  
Wavelength Region ◽  
Silicate Glasses ◽  
Full Width ◽  
Half Maximum ◽  
Infrared Luminescence ◽  
Barium Silicate ◽  
Luminescent Centers

Infrared (IR) luminescence covering 1.1 to ∼1.6 μm wavelength region was observed from bismuth-doped barium silicate glasses, excited by a laser diode at 808 nm wavelength region, at room temperature. The peak of the IR luminescence appears at 1325 nm. A full width half-maximum (FWHM) and the lifetime of the fluorescence is more than 200 nm and 400 μs, respectively. The fluorescence intensity increases with Al2O3 content, but decreases with BaO content. We suggest that the IR luminescence should be ascribed to the low valence state of bismuth Bi2+ or Bi+, and Al3+ ions play an indirect dispersing role for the infrared luminescent centers.

Effect of GeO2 additive on fluorescence intensity enhancement in bismuth-doped silica glass

2007 ◽  
Vol 22 (3) ◽  
pp. 565-568 ◽  
Author(s):  
Yasushi Fujimoto ◽  
Yuki Hirata ◽  
Yoshiyuki Kuwada ◽  
Takahiro Sato ◽  
Masahiro Nakatsuka
Keyword(s):  
Fluorescence Intensity ◽  
Silica Glass ◽  
Experimental Results ◽  
Full Width ◽  
Half Maximum ◽  
Intensity Enhancement ◽  
Luminescent Centers

We observed the enhancement of fluorescence intensity due to the addition of GeO2 in bismuth-doped silica glass (BiSG), which has a peculiar fluorescence at 1.25 μm with a full width at half-maximum of 300 nm. Experimental results revealed that the fluorescence intensity from BiSG with 5.0 mol% GeO2 increased remarkably to be 26.3 times greater than that without GeO2 additive for the same Bi2O3 concentration (0.1 mol%). Furthermore, the enhanced sample showed almost the same intensity as BiSG without GeO2 for 1.0 mol% Bi2O3. These results demonstrate that GeO2 additive effectively promotes the generation of peculiar luminescent centers.

Observation of continuous KrCl excimer fluorescence in microwave discharges employing binary mixtures of Kr and Cl2

1991 ◽  
Vol 69 (6) ◽  
pp. 699-701 ◽  
Author(s):  
Scott B. Hassal ◽  
Edward A. Ballik
Keyword(s):  
Binary Mixture ◽  
Total Pressure ◽  
Full Width Half Maximum ◽  
Continuous Wave ◽  
Wavelength Region ◽  
Gas Composition ◽  
Full Width ◽  
Half Maximum ◽  
Excimer Fluorescence ◽  
Microwave Discharges

A novel apparatus was designed to couple 2.45-GHz microwave radiation into a gas discharge. Using this apparatus, continuous-wave 222-nm B → X fluorescence of the KrF excimer system was observed in a binary mixture of chlorine and krypton. The effects of gas composition and total pressure on the fluorescence intensity at a wavelength of 222 nm was investigated. Spectra over the wavelength region of 200–320 nm were recorded for various gas compositions near the optimum total pressures for excimer fluorescence. The 222-nm B → X KrCl excimer transition was apparent in all cases and had a full-width half-maximum (FWHM) of 3 nm. In addition, the 258-nm Cl2 excimer transition was also evident with a FWHM of 5 nm. Both the center frequencies and widths of these transitions were constant for the conditions tested.

Formation of Nanocluster Colloids of Tin, Gold and Copper in Magnesium Oxide by MeV Ion Implantation

1997 ◽  
Vol 504 ◽  
Author(s):  
R. L. Zimmerman ◽  
D. Ila ◽  
E. K. Williams ◽  
S. Sarkisov ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Single Crystals ◽  
Magnesium Oxide ◽  
Room Temperature ◽  
Full Width Half Maximum ◽  
Rutherford Backscattering Spectrometry ◽  
Threshold Fluence ◽  
Full Width ◽  
Half Maximum ◽  
Absorption Bands

ABSTRACTWe have implanted ions of Sn, Au and Cu at energies between 160 keV and 2.0 MeV into single crystals of MgO (100) at room temperature. The formation of nanoclusters was confirmed using photospectrometry, in combination with Mie's theory, which was indirect but nondestructive. Using Doyle's theory, as well as Rutherford Backscattering Spectrometry (RBS), we correlated the full width half maximum of the absorption bands to the estimated size of the metallic nanoclusters between 1–10 nm. These clusters were formed both by over implantation and by a combination of threshold fluence of the implanted species and post thermal annealing. The changes in the estimated size of the nanoclusters, after annealing at temperatures ranging from 500°C to 1000°C, were observed using photospectrometry.

scholarly journals Spectroscopic Studies of Laser-Based Far-Ultraviolet Plasma Light Source

2021 ◽  
Vol 11 (15) ◽  
pp. 6919
Author(s):  
Majid Masnavi ◽  
Martin Richardson
Keyword(s):  
Dense Plasma ◽  
Wavelength Region ◽  
Spectroscopic Studies ◽  
Radiation Hydrodynamics ◽  
Full Width ◽  
Half Maximum ◽  
Laser Plasmas ◽  
Series Of Experiments ◽  
Far Ultraviolet ◽  
Radiation Conversion

A series of experiments is described which were conducted to measure the absolute spectral irradiances of laser plasmas created from metal targets over the wavelength region of 123–164 nm by two separate 1.0 μm lasers, i.e., using 100 Hz, 10 ns, 2–20 kHz, 60–100 ns full-width-at-half-maximum pulses. A maximum radiation conversion efficiency of ≈ 3%/2πsr is measured over a wavelength region from ≈ 125 to 160 nm. A developed collisional-radiative solver and radiation-hydrodynamics simulations in comparison to the spectra detected by the Seya–Namioka-type monochromator reveal the strong broadband experimental radiations which mainly originate from bound–bound transitions of low-ionized charges superimposed on a strong continuum from a dense plasma with an electron temperature of less than 10 eV.

Photoluminescence of Erbium-Diffused Silicon

1996 ◽  
Vol 422 ◽  
Author(s):  
H. Horiguchi ◽  
T. Kinone ◽  
R. Saito ◽  
T. Kimura ◽  
T. Ikoma
Keyword(s):  
Room Temperature ◽  
Crystalline Silicon ◽  
Luminescence Spectra ◽  
Main Peak ◽  
Silicon Substrates ◽  
Annealing Atmosphere ◽  
Full Width ◽  
Half Maximum ◽  
Strong Luminescence ◽  
Fine Structures

AbstractErbium films are evaporated on crystalline silicon substrates and are thermally diffused into silicon in an Ar+02 or H2 flow. Very sharp Er3+-related luminescence peaks are observed around 1.54 μ m.The main peak as well as the fine structures of the luminescence spectra depend on the annealing atmosphere, suggesting different luminescence centers. The full width at half maximum (FWHM) of the main peaks is ≤ 0.5nm at 20K. Thermal diffusion with Al films on top of the Er films is found to increase the intensity of the Er3+-related peaks greatly. The temperature dependence between 20 K and room temperature is relatively small, and a strong luminescence is obtained at room temperature.

scholarly journals Observation of strong excitonic magneto-chiral anisotropy in twisted bilayer van der Waals crystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shoufeng Lan ◽  
Xiaoze Liu ◽  
Siqi Wang ◽  
Hanyu Zhu ◽  
Yawen Liu ◽  
...  
Keyword(s):  
Time Reversal ◽  
Room Temperature ◽  
Photochemical Reactions ◽  
Full Width ◽  
Half Maximum ◽  
A Value ◽  
Device Applications ◽  
Spectral Splitting ◽  
Iron Garnet ◽  
Spontaneous Magnetic Moment

AbstractThe interplay between chirality and magnetism generates a distinct physical process, the magneto-chiral effect, which enables one to develop functionalities that cannot be achieved solely by any of the two. Such a process is universal with the breaking of parity-inversion and time-reversal symmetry simultaneously. However, the magneto-chiral effect observed so far is weak when the matter responds to photons, electrons, or phonons. Here we report the first observation of strong magneto-chiral response to excitons in a twisted bilayer tungsten disulfide with the amplitude of excitonic magneto-chiral (ExMCh) anisotropy reaches a value of ~4%. We further found the ExMCh anisotropy features with a spectral splitting of ~7 nm, precisely the full-width at half maximum of the excitonic chirality spectrum. Without an externally applied strong magnetic field, the observed ExMCh effect with a spontaneous magnetic moment from the ferromagnetic substrate of thulium iron garnet at room temperature is favorable for device applications. The unique ExMCh processes provide a new pathway to actively control magneto-chiral applications in photochemical reactions, asymmetric synthesis, and drug delivery.

Comparison of the distributions of galactic y-radiation and radio synchrotron radiation

1981 ◽  
Vol 301 (1462) ◽  
pp. 573-575 ◽  
Keyword(s):  
Radio Emission ◽  
Full Width Half Maximum ◽  
Detailed Comparison ◽  
Full Width ◽  
Half Maximum ◽  
Brightness Temperatures ◽  
Point Spread ◽  
Sky Survey ◽  
Spread Function ◽  
Continuum Radio

We have used the new all-sky survey of continuum radio emission at 408 MHz of Haslam et al. (1981 a, b ) to compare the distribution of radio emission in a band along the galactic equator for [ b ] < 20° with the COS-B y-ray distribution of Mayer-Hasselwander et al. (1980). The radio survey has resolution with full width half-maximum (f.w.h.m.) of 51 arc min and the data are brightness temperatures at 20' intervals in galactic coordinates. Such comparisons have been made before (see, for example, Jakel et al. 1975; Paul et al. 1976; Higdon 1979) with earlier y-ray data but this is the first in which the radio data have been in a form allowing a detailed comparison after convolution with the point spread function of the y-ray detector.

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