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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Pandey, A. Roy, M.K. Pandey, A. Zanella, M. Sperling, R.A. Parak, W.J. Samaddar, A.B. Verma, H.C. |
| Copyright Year | 2002 |
| Abstract | Eu+++ and Tb+++ ions have been incorporated into nanodimensional yttrium oxide host matrices via a sol-gel process using Y5O(OPri)13 as precursor (OPri = isopropoxy). The as-synthesized white powders have been annealed at different temperatures. Photoluminescence (PL) spectroscopy and X-ray diffraction (XRD) have been used as tools for documenting the characteristics of these powders. For Eu+++-doped powders, a comparison of the Eu+++, 5D0rarr7F1, and 5D0rarr7F2 peak intensities in the emission spectra reveals that the dopant ions are occupying unsymmetrical sites in the host yttrium oxide in all the samples. For Tb+++-doped powders, the characteristic terbium 5D3rarr7Fn and 5Drarr7Fn ( n = 2-6) transitions were visible only in the samples that had been annealed above 500degC. Samples of the doped particle powders were suspended in chloroform by fragmenting the powder with and without sonification under the presence of trioctylphosphine oxide, or a mixture of oleic acid and dioctyl ether. The resulting clear colorless (for Eu+++ ) and light green translucent (for Tb+++) solutions of the suspended particles showed red and green luminescence upon UV excitation, respectively. In addition, suspension in water has been achieved by fragmenting the powder in the presence of dichloroacetic acid. Transmission electron micrograph investigation of the soluble particles shows single dispersed particles along with agglomerates. The changes in the luminescence due to fragmentation of the particle powder and due the influence of the surfactant of the suspended colloidal particles are discussed. |
| Sponsorship | IEEE Engineering in Medicine and Biology Society IEEE Systems, Man, and Cybernetics Society IEEE Nanotechnology Council IEEE Computational Intelligence Society IEEE Robotics and Automation Society IEEE Computer Society |
| Page Count | 8 |
| File Size | 603990 |
| Starting Page | 43 |
| Ending Page | 50 |
| File Format | |
| ISSN | 15361241 |
| Volume Number | 8 |
| Issue Number | 1 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-03-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Powders Yttrium Annealing Luminescence Temperature Photoluminescence Spectroscopy X-ray diffraction X-ray scattering Electrons sol–gel process Colloidal nanoparticles nanophosphors particle suspension |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Medicine Bioengineering Electrical and Electronic Engineering Biomedical Engineering Computer Science Applications Biotechnology Pharmaceutical Science |
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