Intensity‐dependent photoluminescence spectra of semiconductor‐doped glasses

1988 ◽  
Vol 53 (8) ◽  
pp. 643-645 ◽  
Author(s):  
J. P. Zheng ◽  
L. Shi ◽  
F. S. Choa ◽  
P. L. Liu ◽  
H. S. Kwok
Keyword(s):  
Photoluminescence Spectra ◽  
Doped Glasses

scholarly journals Effect of impurities and disordering on the photoluminescence of crystals and glasses in the system Li2O - 7GeO2

2019 ◽  
Vol 27 (1) ◽  
pp. 51-56
Author(s):  
O. V. Ohiienko ◽  
V. N. Moiseienko ◽  
M. D. Volnyanskij
Keyword(s):  
Luminescence Band ◽  
Material Structure ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Broad Luminescence Band ◽  
Intense Luminescence ◽  
Doped Glasses ◽  
Effect Of Impurities ◽  
Oxygen Complexes ◽  
Octahedral Configuration

The work is devoted to the study of photoluminescence spectra of weakly polar ferroelectric crystals Li2Ge7O15 and Li2O – 7GeO2 glasses. For all initial samples was observed the wide intensive luminescence band with maximum in the region of 525–550 nm. The spectral distribution of intensity and the position of the maximum of the band for a Li2Ge7O15 crystal depended on the excitation wavelength (λex=405 nm or 365nm were used). The spectral profile of the luminescence band was broadened in glass containing of 0.67% copper. The intensity of the luminescence band was decreased 6 times for glass doped with Cr3+ ions (0.01%) as compared with glass containing Cu2+ ions. The intense luminescence band of Cr3+ ions with λmax=659nm was appeared starting from 600. The assumption about the nature of the broad luminescence band observed in both nominally pure and doped glasses and crystals was made: the source of luminescence can be germanium - oxygen complexes [GeO4] and [GeO6] of the tetrahedral and octahedral configuration in the material structure.

scholarly journals Photoluminescence of Erbium-Doped Glasses 70 Ga2S3 – 30 La2S3

2018 ◽  
Vol 19 (4) ◽  
pp. 331-335
Author(s):  
V.V. Halyan ◽  
I.A. Ivashchenko ◽  
A.H. Kevshyn ◽  
I.D. Olekseyuk ◽  
P.V. Tishchenko
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Energy Transition ◽  
Optical Absorption Spectra ◽  
Photoluminescence Spectra ◽  
Transition Diagram ◽  
Erbium Ions ◽  
Erbium Doped ◽  
Doped Glasses

Glasses of the composition (70–X) mol.% Ga2S3 - 30 mol.% La2S3 - X Er2S3 (at X = 0, 1, 3) were synthesized  and the optical absorption spectra at room temperature were studied. Photoluminescence spectra in the 2.53 - 0.73eV range at 300 and 80K were investigated. Intense PL maxima at 2.25, 1.88, 1.45, 1.26, 1.13, 0.81 eV were found which correspond to transitions in the f-shell of erbium ions. The redistribution of the intensity of PL peaks with temperature was analyzed based on the energy transition diagram of erbium ions.

scholarly journals Collective Optical, FTIR, and Photoluminescence Spectra of CeO2 and/or Sm2O3-Doped Na2O–ZnO–P2O5 Glasses

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
M. A. Marzouk ◽  
H. A. ElBatal ◽  
Y. M. Hamdy ◽  
F. M. Ezz-Eldin
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Spectral Studies ◽  
Luminescence Spectra ◽  
Ir Absorption ◽  
Photoluminescence Spectra ◽  
Absorption Bands ◽  
Infrared Spectral ◽  
Doped Glasses ◽  
The Rare Earth

Glasses with the Na2O–ZnO–P2O5 composition and doped with single CeO2, Sm2O3, or mixed dopants were melted and studied. Collective optical, photoluminescence, and FT-infrared spectral studies were carried out. CeO2-doped glasses show two extra UV absorption bands due to Ce4+ and Ce3+ ions while Sm2O3-doped samples reveal pronounced peaks collected into two segments from 367 to 472 nm and from 950 to 1623 nm which are characteristic of absorption from Sm3+ ions. The mixed dopants glasses show combined UV-visible–near-IR absorption peaks due to cerium (Ce4+, Ce3+) ions and samarium (Sm3+) ions. The photoluminescence spectra (PL) of the single CeO2-doped and Sm2O3-doped glasses and even the mixed dopant sample reveal luminescence spectra after excitation which are characteristic of the rare-earth ions. The intensities for both excited or emitted peaks are found to increase with the increase of the rare-earth percent. FTIR spectra of the glasses show pronounced vibrational peaks related to phosphate groups (Q2 and Q3 units) in accordance with the P2O5 percent (70 mol %).

Waveguide amplifiers in rare-earth doped glasses : fabrication, characterisation [MATH] modelling

1994 ◽  
Vol 04 (C4) ◽  
pp. C4-277-C4-280 ◽  
Author(s):  
B. HYDE ◽  
D. BARBIER ◽  
J. HUBNER ◽  
J.-M. JOUANNO ◽  
A. KEVORKIAN ◽  
...  
Keyword(s):  
Rare Earth ◽  
Waveguide Amplifiers ◽  
Doped Glasses ◽  
Rare Earth Doped

Study of Phosphocalcic Glasses from SiO2-CaO-P2O5 System with and Without Silver II. The bioactivity analysis by FTIR, SEM methods and microbiological study of silver-doped glasses

2017 ◽  
Vol 68 (6) ◽  
pp. 1188-1192
Author(s):  
Daniela Avram ◽  
Nicolae Angelescu ◽  
Dan Nicolae Ungureanu ◽  
Ionica Ionita ◽  
Iulian Bancuta ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Body Fluid ◽  
Pathogenic Bacteria ◽  
De Novo ◽  
Microbiological Examination ◽  
Doped Glasses ◽  
P2o5 System ◽  
Scanning Electron

The study in vitro of the glass powders bioactivity was performed by soaking them in simulated body fluid for 3 to 21 days at a temperature of 37�C and pH = 7.20. The synthesis de novo of hydroxyapatite, post soaking was confirmed by Fourier Transform Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The study of the antimicrobial activity was performed by microbiological examination on two strains of pathogenic bacteria involved in postoperative nosocomial infections.

scholarly journals Structural and Enhanced Optical Properties of Stabilized γ‒Bi2O3 Nanoparticles: Effect of Oxygen Ion Vacancies

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1023 ◽  
Author(s):  
Ashish Chhaganlal Gandhi ◽  
Chia-Liang Cheng ◽  
Sheng Yun Wu
Keyword(s):  
Room Temperature ◽  
Excess Oxygen ◽  
Ambient Atmosphere ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Band Emission ◽  
Oxygen Ion ◽  
Integrated Intensity ◽  
Effect Of Oxygen

We report the synthesis of room temperature (RT) stabilized γ–Bi2O3 nanoparticles (NPs) at the expense of metallic Bi NPs through annealing in an ambient atmosphere. RT stability of the metastable γ–Bi2O3 NPs is confirmed using synchrotron radiation powder X-ray diffraction and Raman spectroscopy. γ–Bi2O3 NPs exhibited a strong red-band emission peaking at ~701 nm, covering 81% integrated intensity of photoluminescence spectra. Our findings suggest that the RT stabilization and enhanced red-band emission of γ‒Bi2O3 is mediated by excess oxygen ion vacancies generated at the octahedral O(2) sites during the annealing process.

Photoluminescence spectra of oxygen-doped ZnSe grown by molecular-beam epitaxy

1989 ◽  
Vol 39 (5) ◽  
pp. 3138-3144 ◽  
Author(s):  
Katsuhiro Akimoto ◽  
Takao Miyajima ◽  
Yoshifumi Mori
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Photoluminescence Spectra
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