scholarly journals Tin Dioxide Nanocrystals as an Effective Sensitizer for Erbium Ions in Er-Doped SnO2Systems for Photonic Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Tran T. T. Van ◽  
Nguyen Truc Ly ◽  
Le T. T. Giang ◽  
Cao Thi My Dung
Keyword(s):  
Tin Oxide ◽  
Doping Concentration ◽  
Tin Dioxide ◽  
Precipitation Method ◽  
Doping Content ◽  
Erbium Ions ◽  
Heat Treated ◽  
Erbium Doped ◽  
Average Size ◽  
Er Doped

Undoped SnO2and erbium-doped SnO2powders were successfully prepared by precipitation method. The effect of the heat treatment and doping contents on the structure of tin oxide and optical properties was also studied. The XRD data and Raman spectra indicate that the SnO2crystals have formed after being heat-treated at 400°C and the average size of grains is about 8 nm for doping content of 1 mol%. An increase of doping concentration has controlled the growth of nanocrystals. The principle of the visible and infrared emissions of SnO2and SnO2:Er is also discussed. All photoluminescence study shows that the Er3+ions can be located in SnO2nanocrystals and that there is energy transfer from defect levels of SnO2nanoparticles to neighboring Er3+ions of crystals.

Performance Analysis of an EDFA Utilizing a Partially Doped Core Fiber (PDCF)

2016 ◽  
Vol 37 (3) ◽  
Author(s):  
M. A. Ahad ◽  
M.C. Paul ◽  
S.Z. Muhd-Yassin ◽  
A. Mansoor ◽  
H.A. Abdul-Rashid
Keyword(s):  
Doping Concentration ◽  
Noise Figure ◽  
Fiber Amplifiers ◽  
The Core ◽  
Erbium Ions ◽  
Erbium Doped ◽  
Ion Doping ◽  
Amplifier Gain ◽  
Core Fiber ◽  
Erbium Ion

AbstractThe effect of transversal design in Erbium-doped fiber amplifiers’ gain and noise figure performance is illustrated in this work. In this work, we investigate experimentally a single pass 980 nm pumped EDFA with partially doped Erbium core fiber (PDCF), which has the core partially doped with Erbium ions. Later, the enumerated results for PDCF are compared with a standard fully doped EDF, having similar Erbium ion doping concentration. The PDCF Amplifier gain and noise figure performance is studied against different pump power and signal power at different operating wavelengths. The noise figure indicates improvement due to reduced spontaneous emission from un-doped region of the core.

Er-Doped GaAs for High Speed Photoconductor Applications

1993 ◽  
Vol 301 ◽  
Author(s):  
S. Gupta ◽  
S. Sethi ◽  
P. K. Bhattacharya ◽  
S. Williamson
Keyword(s):  
Optical Communications ◽  
Potential Application ◽  
High Speed ◽  
Doping Concentration ◽  
Carrier Lifetime ◽  
High Resistivity ◽  
Light Sources ◽  
Erbium Doped ◽  
Er Doped

ABSTRACTThe observation of 1.54 μm luminescence in erbium-doped-GaAs (GaAs:Er) and AlxGal-xAs, has stimulated research efforts because of their potential application to light sources in optical communications. In this paper, we study a different aspect of the photoresponse behavior of this material. The dependence of the carrier lifetime on the doping concentration of Erbium is investigated in GaAs:Er grown by MBE. A reduction in the carrier lifetime down to ∼1 ps is observed for the highest doping (∼5×1019 cm−3) investigated. Together with the high-resistivity observed for the higher doping values, this material serves as a novel photoconductor material for high-speed optoelectronics.

scholarly journals Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1950 ◽  
Author(s):  
Ariel Meneses-Franco ◽  
Marcelo Campos-Vallette ◽  
Sergio Vásquez ◽  
Eduardo Soto-Bustamante
Keyword(s):  
Emission Spectroscopy ◽  
Lattice Structure ◽  
Sol Gel ◽  
Site Location ◽  
Erbium Ions ◽  
Erbium Doped ◽  
Doping Mechanism ◽  
Doped Barium Titanate ◽  
Er Doped ◽  
Upconversion Emissions

Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO3 lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and 5%, with Ba/Ti ratios of 1.008 and 0.993. The stoichiometry of Ba and Ti concentrations in the lattice influenced the doping mechanism and placement of erbium ions in the lattice structure. Our research shows the existence of a strong correlation between Ba/Ti ratios, erbium concentration, phase structure and doping site location on the upconversion photoluminescence mechanisms. Competing upconversion emissions 2H11/2/4S3/2→4I15/2 at 523 and 548 nm respectively and other photoluminescent mechanisms as 4I9/2→4I11/2 around 4000 nm (2500 cm−1) were studied using Raman and emission spectroscopy. The upconversion process is predominant over other photoluminescent decay when the material presents high distortion in the surrounding activator.

Synthesis, Structure and Luminescence Characterization of Erbium Doped Hydroxyapatite Nanoparticles by Precipitation Method

2019 ◽  
Vol 9 (3) ◽  
pp. 218-225 ◽  
Author(s):  
Pooja Gitty ◽  
Madanan Kailasnath ◽  
Vadakkedathu Parameswaran Narayanan Nampoori
Keyword(s):  
Optical Properties ◽  
Infrared Imaging ◽  
Average Particle Size ◽  
Primary Objective ◽  
Precipitation Method ◽  
Average Particle ◽  
Structural And Optical Properties ◽  
Absorption Bands ◽  
Erbium Ions ◽  
Erbium Doped

Introduction: Hydroxyapatite, Ca10 (PO4)6(OH)2, a ceramic material is the major inorganic component in bones and teeth of animals and humans. Although erbium is one of the prominent representative elements among the lanthanides, erbium doped hydroxyapatite has not been studied to a greater extent. This study reports the synthesis of erbium doped hydroxyapatite using the simple precipitation method and its structural and optical properties. Objective: The primary objective of this study was to synthesize erbium doped hydroxyapatite and to study the structural and optical properties. Materials and Methods: Nanocrystalline erbium doped hydroxyapatite was successfully prepared using simple precipitation method. Average particle size of the synthesized particle was around 8-10 nm. Results: The typical absorption spectra of the erbium doped hydroxyapatite sample shows almost well defined peaks of the erbium ions. The absorption bands were observed at 360 nm, 373 nm, 448 nm, 490 nm, 524 nm and at 653 nm. The photoluminescence spectrum showed the presence of a green band at 550 nm and a red band which peaked at 750 nm. Conclusion: Spherical shaped nanocrystalline hydroxyapatite, Ca10 (PO4)6(OH)2 substituted with Erbium(III) were obtained using precipitation method. The synthesized Er3+ doped hydroxyapatite can be used for biophotonic applications, which exploits their exquisite optical properties and infrared imaging and several other therapeutic applications.

scholarly journals Amplifying characteristics Er-doped chalcogenide glass

2010 ◽  
Vol 64 (3) ◽  
pp. 183-186
Author(s):  
Vesna Petrovic ◽  
Nikola Stojanovic ◽  
Milos Slankamenac ◽  
Svetlana Lukic
Keyword(s):  
Chalcogenide Glasses ◽  
Laser Source ◽  
Source Power ◽  
Erbium Ions ◽  
Fluorescence Maximum ◽  
Useful Signal ◽  
Erbium Doped ◽  
Measurement Results ◽  
Er Doped ◽  
Doped Glass

The paper presents the measurement results of optical amplifying characteristics of Er-doped As-S-Ge chalcogenide glasses. The measurements included the amplification of useful laser source power during propagation along two axes of samples. A fluorescence maximum at the wavelengths between 1500 nm and 1540 nm was identified, which corresponds to the transition of electrons from the 4I13/2 level to the 4I15/2 level within the 4f shell of Erbium ions (Er3+). Measuring the signal strength showed that the passage through the erbium doped chalcogenid glass amplification of the useful signal occurs and this increase is proportional to the length of propagation through the doped glass.

Structural and morphological characterization of CdS nanoparticles

2020 ◽  
Vol 10 ◽  
Author(s):  
Manish Dwivedi ◽  
Vijay Tripathi ◽  
Dhruv Kumar ◽  
Dwijendra K. Gupta
Keyword(s):  
Blue Shift ◽  
Chemical Precipitation ◽  
Morphological Characterization ◽  
Precipitation Method ◽  
Cds Nanoparticles ◽  
Cubic Phase ◽  
Simple Chemical ◽  
Xrd Patterns ◽  
Average Size ◽  
Physical Tools

Aims: CdS nanoparticles are an attractive material having application in various field like as pigment in paints, biotag for bioimaging and many more optoelectronic as well as biological applications. Present study aims to synthesize and characterize the CdS nanoparticles to make it applicable in different areas Objectives: Preparation CdS nanoparticles by using simple and facile chemical methods and further physical and structural characterization using various physical tools Methods: In present work CdS nanoparticles has been synthesized by using rationally simple chemical precipitation method with some modi-fication on temperature and incubation time in existed methods. Characterizations were done by employing XRD, SEM, TEM, AFM tech-niques Results: Simple chemical method produces the CdS nanoparticles with the size about 100-200 nm in length and 5-10 nm in diameter. The SEM studies show that the CdS nanoparticles can agglomerate and form a continuous network like structure. The X-ray diffraction (XRD) measurements show the single-phase formation of CdS nanoparticles with the structure of cubic phase, and the broadening of XRD patterns indicates that the prepared samples are nanostructured. Our analysis on CdS nanoparticles by using transmission electron microscope and atomic force microscope (AFM) revealed that the nanoparticles form both spherical and nearly rod shaped with the average size applicable for biotagging. UV-Vis spectroscopic analysis reveals blue shift in the absorption peak probably caused by quantum confinement Conclusion: The observed CdS nanoparticles were appeared yellow in color. The XRD pattern of the CdS nanoparticles showed that the materials were of nanometric sized regime with a predominantly cubic phase along with the rod and round morphology. The study and char-acterization of CdS nanoparticles will bring us a new approach to understand biological problem by tagging nanoparticles with biomolecules and further suggests that the CdS nanoparticles formulate it more suitable biocompatible nanomaterial for biotagging and bioimaging

scholarly journals Experimental Measurement of Absorption Coefficients for Effective Erbium-Doping Concentration to Optimize Few-Mode Erbium-Doped Fiber Amplifiers with Low Differential Mode Gain

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 185
Author(s):  
Yan Xu ◽  
Baojian Wu ◽  
Xinrui Jiang ◽  
Haomiao Guo ◽  
Feng Wen
Keyword(s):  
Doping Concentration ◽  
Point Of View ◽  
Fiber Amplifiers ◽  
Efficient Design ◽  
Absorption Loss ◽  
Differential Mode ◽  
Transmission Method ◽  
Modal Gain ◽  
Analysis Process ◽  
Erbium Doped

According to the analytical expression for modal gain of few-mode erbium-doped fiber amplifiers (FM-EDFAs), we propose a method of measuring the absorption loss coefficients of few-mode signals in few-mode erbium-doped fibers (FM-EDFs) by extrapolating the mode–gain curve dependent on the average population inversion. The absorption loss coefficient of an FM-EDF was measured in our experimental platform and used to estimate the effective erbium-ion doping concentration. The feasibility of the extrapolation method was verified by simulation and comparison with the transmission method. Furthermore, the FM-EDFAs with high modal gain and low differential mode gain (DMG) could be optimized by adjusting the FM-EDF’s length and pump power. The analysis process presented here is very useful for the efficient design of FM-EDFAs from a practical point of view.

Annealing effects on phase transformation and powder microstructure of nanocrystalline zirconia polymorphs

1999 ◽  
Vol 14 (1) ◽  
pp. 90-96 ◽  
Author(s):  
R. Ramamoorthy ◽  
S. Ramasamy ◽  
D. Sundararaman
Keyword(s):  
Monoclinic Phase ◽  
Lattice Strain ◽  
Dopant Concentration ◽  
Precipitation Method ◽  
Strain Effect ◽  
Volume Percentage ◽  
Annealing Temperatures ◽  
Annealing Effects ◽  
Nanocrystalline Zirconia ◽  
Average Size

Nanocrystalline zirconia powders in pure form and doped with yttria and calcia were prepared by the precipitation method. In the as-prepared condition, all the doped samples show only monoclinic phase, independent of the dopants and dopant concentration. On annealing the powders at 400 °C and above, in the case of 3 and 6 mol% Y2O3 stabilized ZrO2 (3YSZ and 6YSZ), the monoclinic phase transforms to tetragonal and cubic phases, respectively, whereas in 3 and 6 mol% CaO stabilized ZrO2 (3CSZ and 6CSZ), the volume percentage of the monoclinic phase gradually decreases up to the annealing temperature of about 1000 °C and then increases for higher annealing temperatures. The presence of monoclinic phase in the as-prepared samples of doped zirconia has been attributed to the lattice strain effect which results in the less symmetric lattice. For the annealing temperatures below 1000 °C, the phenomenon of partial stabilization of the tetragonal phase in 3CSZ and 6CSZ can be explained in terms of the grain size effect. High resolution transmission electron microscopy (HRTEM) observations reveal the lattice strain structure in the as-prepared materials. The particles are found to be a tightly bound aggregate of small crystallites with average size of 10 nm. The morphology of the particles is observed to be dependent on the dopants and dopant concentration.

Synthesis and Luminescence Properties of Tb3+-Doped Hydroxyapatites

2011 ◽  
Vol 399-401 ◽  
pp. 1582-1587
Author(s):  
Su Ping Huang ◽  
Jun Zhu ◽  
Ke Chao Zhou
Keyword(s):  
Aspect Ratio ◽  
Fluorescence Intensity ◽  
Doping Concentration ◽  
Doping Content ◽  
Fluorescent Properties ◽  
Strong Fluorescence ◽  
Active Growth ◽  
Ph Values ◽  
Structure Morphology ◽  
Ultraviolet Ray

In this paper, the terbium -doped nano-HA powders with strong fluorescence was prepared by hydrothermal synthesis and its crystal structure，morphology and fluorescent properties are characterized by XRD, TEM, XPS, ICP and PL spectroscopy. Results showed that with the doping concentration of Tb3+increasing, the aspect ratio of Tb3+-doped HA particles decreased, while the fluorescence intensity excited by ultraviolet ray at 272 nm is significantly enhanced. With pH values increased from 6.5 to 10.0, the aspect ratio of Tb3+-doped HA decreased greatly, and the morphology of nano-Tb:HA particles changes from rod particles to equiaxed particles and the actual doping content and the fluorescence intensity tends to increase correspondingly, which can be explained that under alkaline solution, Tb3+was more easier entering the HA crystal, and the Tb3+would substitute the Ca2+ in both hydroxyapatite Ca(Ⅰ) and Ca(Ⅱ) site, which may block the active growth sites of the seed crystals and resulted in the growth rate and the ratio of length to radius decreasing.

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