Last edited by Nigar
Thursday, May 7, 2020 | History

2 edition of Synthesis and characterization of new optical frequency converters and phosphor hosts found in the catalog.

Synthesis and characterization of new optical frequency converters and phosphor hosts

Annapoorna Akella

Synthesis and characterization of new optical frequency converters and phosphor hosts

by Annapoorna Akella

  • 61 Want to read
  • 14 Currently reading

Published .
Written in English

    Subjects:
  • Borates -- Optical properties.,
  • Fluorides -- Optical properties.,
  • Phosphors.,
  • X-ray crystallography.,
  • Luminescence.

  • Edition Notes

    Statementby Annapoorna Akella.
    The Physical Object
    Pagination282 leaves, bound. :
    Number of Pages282
    ID Numbers
    Open LibraryOL15395300M

    Zero-dimensional (0D) inorganic perovskites have recently emerged as an interesting class of material owing to their intrinsic Pb2+ emission, polaron formation, and large exciton binding energy. The Direct On-Chip Digital Optical Synthesizer (DODOS) program seeks to create a technological revolution in optical frequency control analogous to the disruptive advances in microwave frequency control in the s. That early development ushered in a new .

      This imposes new requirements for low levels of phase noise realizable by laser stabilization by a hi-Q optical cavity of a phase-coherent optical frequency comb. The multi-level frequency divide serves as a tool for synthesizing many low-phase noise frequencies useful to . Evaluating NaREMgWO 6 (RE = La, Gd, Y) Doubly Ordered Double Perovskites as Eu 3+ Phosphor Hosts Andrew R. Sharits, Jason F. Khoury, and Patrick M. Woodward pp –

    90º optical-switching of output second harmonic light in chiral photomagnet. Shin-ichi Ohkoshi, 1,2, * Shinjiro Takano, 1. Kenta Imoto, 1. Marie Yoshikiyo, 1. Asuka Namai, 1. and Hiroko Tokoro. 1,3 1. Department of Chemistry, School of Science, The University of Tokyo Hongo, Bunkyo-ku, Tokyo , Japan. 2. the optical nodes in which the FWM based converter is going to be used. The dual pump scheme is used to overcome these drawbacks to some extent [2]. Typical value of CE is db, so optical power levels of ~10dBm have to be used for the pump of SOA converters while “dBm” is needed for fiber based converters.


Share this book
You might also like
Home office building for State Compensation Insurance Fund

Home office building for State Compensation Insurance Fund

Hearings on House Bills 47, 145, 440, 10699, 12316, 12478, and 12615, Proposing To Extend the Time for Which Cattle and Other Animals May Be Confined During Shipment from One State to Another

Hearings on House Bills 47, 145, 440, 10699, 12316, 12478, and 12615, Proposing To Extend the Time for Which Cattle and Other Animals May Be Confined During Shipment from One State to Another

Formula index to NMR literature data.

Formula index to NMR literature data.

Jane Shore

Jane Shore

Complete fortune telling.

Complete fortune telling.

life and times of Selina, Countess of Huntingdon.

life and times of Selina, Countess of Huntingdon.

War of races

War of races

Girl going nowhere

Girl going nowhere

Concrete Finishing/Level 1

Concrete Finishing/Level 1

Small watershed projects of the Soil Conservation Service

Small watershed projects of the Soil Conservation Service

The principles of moral philosophy investigated

The principles of moral philosophy investigated

Oil and gas title examination

Oil and gas title examination

Exploratory investigation into correlates of fertility for Washington State

Exploratory investigation into correlates of fertility for Washington State

Composition of scientific words

Composition of scientific words

The Collected Stories of Isaac Babel

The Collected Stories of Isaac Babel

Synthesis and characterization of new optical frequency converters and phosphor hosts by Annapoorna Akella Download PDF EPUB FB2

Graduate Thesis Or Dissertation Synthesis and characterization of new optical frequency converters and phosphor hosts Public Deposited. Analytics × Add to Cited by: 1.

Synthesis and characterization of new optical frequency converters and phosphor hosts. Download PDF (11 MB) Abstract. Graduation date: Year: OAI identifier: oai: @article{osti_, title = {Synthesis and study of new borate optical hosts}, author = {Alekel, T.

III.}, abstractNote = {This thesis is directed toward the discovery and fundamental characterization of new solid-state crystalline materials. The investigations have included the development of synthetic routes to new compounds, structural determination of microscopic environments, and.

Nanocrystalline infrared-to-visible up-conversion phosphors, ytterbium and erbium co-doped sodium yttrium fluoride, were synthesized. Spherical particles with narrow size distribution were prepared by a co-precipitation method in the presence of ethylenediaminetetraacetic acid (EDTA).

Particles of controlled size in the range of 37 to nm diameter were obtained by adjusting the molar ratio Cited by: The effects of solid state synthesis method on luminescence characteristics are Optical band gap was found eV by the Transmission Spectra of the (Cd,Zn)S:Ag.

Here we used combustion synthesis method for preparation of CaSr2Al2O6 with different rare earth ion such as Tb3+ and Eu3+ ions for the production of white light emission. The entire rare earth ion shows effective luminescence efficiency in aluminate based compounds.

Further, prepared phosphor was analyzed by XRD, SEM, FTIR, and CIE with photoluminescence measurment in addition with. In the present study, the structural and optical properties of SrSnO 3 doped with Tb ions are reported. Novel SrSnO 3:Tb 3+ phosphors were conventionally synthesized using a solid state reaction process under a mildly reduced atmosphere (5%H 2 and 95%N 2).The crystal structures, morphologies and optical properties of the resultant materials have been characterised by experimental techniques.

[5, 6]. Sr2CeO4 phosphor has been widely studied because of its importance in the realization of a new generation of optoelectronic and displaying devices. Recently, some groups began using all kinds of methods to fabricate this promising material and research its luminescent properties [].

In this research, we have studied on the synthesis. In this paper, we investigate as a function of erbium concentration (1, 2, 5, 10 mol %) the upconversion properties of bulk and nanocrystalline Er3+ doped cubic Y2O3.

After excitation at short wavelength ( nm) or with upconversion pumping ( nm), green and red emissions were observed for both nanocrystalline and bulk samples in the visible region of the spectrum, while blue emission.

Request PDF | Optical Characterization of Eu3+ Doped and Undoped Sr2CeO4 Phosphors | Optical Characterization of Eu³⁺ Doped and Undoped Sr2CeO4 Phosphors The typical blue phosphor Sr2CeO4.

The emphasis of this work has been in two areas of optical materials - the crystal-chemical development of new optical frequency converters and the synthesis and study of new hosts forCr3 luminescence and lasing.

A simple method has been developed to identify promising frequency-doubling materials containing triangular oxoanions by estimation of nonlinear. Umesh et al. / Journal of Alloys and Compounds () – 10 20 30 40 50 60 70 Intensity (a.u.) 2θ(degrees) a b c d Fig PXRDpatternsofNd2O3 (a)asformed(combustionsynthesis);(b)calcinated at C (combustion synthesis); (c) as-formed (hydrothermal synthesis) and (d) calcinated at C (hydrothermal synthesis).

YPO4:x mol.% Eu3+ phosphors with different dopant concentrations (x = 3, 5, 8, 11, 13) have been synthesized via high-temperature solid-state reaction. X-ray diffraction analysis and Raman and infrared (IR) spectroscopy were applied for detailed structural characterization.

Under excitation at wavelength of  nm, the photoluminescence spectra displayed the 5D0 . of Sr 2CeO 4 is suitable for the doping of rare earth ions in pursuing new luminescent materials, rare earth (Sm 3+, Dy 3+ and Eu 3+) ions were added to the blue phosphor to create white light emission from the Sr 2CeO 4 phosphor.

This thesis presents the synthesis and spectroscopic studies of pure and rare earth doped Sr 2CeO 4 phosphors. Silica-based materials are well-known hosts for small organic molecules.

Interaction of guest molecules with these hosts is generally noncovalent in nature. Similar noncovalent interaction is observed in host–guest complexes of silica nanostructures and organic molecules, leading to significant interest in their application in drug delivery. Ce3+ doped cubic KLaF4 system was synthesized by co-precipitation method.

The sample was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectrophotometer and fluorescence spectrophotometer. The result indicated the nanoparticle diameter of KLaF4:Ce3+ was nm. The KLaF4:Ce3+ had a stronger absorption at nm, which could be.

A new phase, Ca 6 BaP 4 O 17, was found in the CaO–BaO–P 2 O 5 phase diagram and its Eu 2+-doped derivative was evaluated as a possible phosphor for solid-state 6 BaP 4 O 17 was prepared by conventional solid-state synthesis and its structure was solved ab initio from high-resolution, synchrotron X-ray powder diffraction data.

The bandgap of Ca 6 BaP 4 O 17 was estimated to be. Why are mycoplasmas resistant to antibiotics that of new optical frequency converters and phosphor hosts' -- subject(s): Optical properties, Luminescence, Borates, Fluorides, Phosphors, X-ray.

This phosphor is one of the few phosphors applied which are sensitized by the host lattice absorption. The d-d optical transitions, discussed above, are spin and parity forbidden and consequently rather slow (decay time in the order of ms). Most rare earth ions show sharp emission bands due to optical.

LIU et al.: OPTICAL ANALYSIS OF PHOSPHOR’S LOCATION FOR HIGH-POWER LIGHT-EMITTING DIODES 67 Fig. Scanning electron microscope photographs of one Cree LED chip and the chip model for the simulation.

TABLE I OPTICAL PROPERTIES OF THECHIP to compare other two nonreflector models of types I and II. Optical properties of solid-state laser lighting devices using SiAlON phosphor–glass composite films as wavelength converters Kenichi Yoshimura 1*, Kazunori Annen, Hiroshi Fukunaga1, Masamichi Harada2, Makoto Izumi1, Kohsei Takahashi 2, Tetsuo Uchikoshi3, Rong-Jun Xie, and Naoto Hirosaki2 1Advanced Technology Research Laboratories, Sharp Corporation, Tenri, NaraJapan.Byfrequency synthesis reduced this to one Frequency synthesis enabled modern RF systems: Precision phase/frequency control → efficient & controlled use of the spectrum control optical channel spacings over 's of GHz, with sub-Hz precision Today's optical systems look like a CB radio Phase-locked coherent optical systems.

Prof. Alessandro Martucci. at Univ degli Studi di Padova. SPIE Involvement: Author Publications (30) Proceedings Article | 4 March Optical properties, Glasses, High power lasers, Ceramics, Semiconductor lasers, Organic materials, Gallium nitride, Diodes, Thermal efficiency.