Electron paramagnetic resonance and photoluminescence properties of alpha-Al2O3:Cr3+ phosphors
DC Element | Wert | Sprache |
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dc.contributor.author | Singh, V. | |
dc.contributor.author | Chakradhar, R. P. S. | |
dc.contributor.author | Rao, J. L. | |
dc.contributor.author | Al-Shamery, K. | |
dc.contributor.author | Haase, M. | |
dc.contributor.author | Jho, Y. -D. | |
dc.date.accessioned | 2021-12-23T16:22:07Z | - |
dc.date.available | 2021-12-23T16:22:07Z | - |
dc.date.issued | 2012 | |
dc.identifier.issn | 09462171 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/14172 | - |
dc.description.abstract | The red emitting Cr3+ activated -Al2O3 powder phosphor has been prepared by easy combustion reactions from mixed metal nitrate reactants and urea with ignition temperatures of 500 A degrees C. The as-synthesized powder was characterized by X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared techniques. The X-ray diffraction pattern reveals that the phosphor crystallized in the hexagonal -Al2O3 phase directly from the combustion reaction. The EPR spectrum exhibits an intense resonance signal with effective value at =3.33 along with a few weak resonance signals with effective values at =13.7, 2.34, 1.95, 1.49, and 1.26. The spin concentration () and its paramagnetic susceptibility () have been evaluated. The excitation spectrum consists of two broad intense bands at 415 nm and 555 nm and are assigned to (4)A(2) (F)-> T-4(1) (F) and (4)A(2) (F)-> T-4(2) (F) transitions, respectively. The intense fluorescence peak around 691 nm is attributed to E-2 ->(4)A(2) transition of Cr3+ ion. By correlating EPR and optical data, the crystal field splitting parameter (), Racah inter-electronic repulsion parameter () have been evaluated and discussed. The EPR and optical studies reveal that Cr3+ ions are occupying in Al3+ sites in octahedral coordination. | |
dc.description.sponsorship | Hanse-Wissenschaftskolleg, Delmenhorst, Germany; GIST; University Grants Commission, New DelhiUniversity Grants Commission, India; Vijay Singh gratefully acknowledges the support of the Hanse-Wissenschaftskolleg, Delmenhorst, Germany. Y.D. Jho acknowledges the support from ``Fusion-Tech. Developments for THz Info. & Comm.'' Program of GIST. Professor J.L. Rao thanks the University Grants Commission, New Delhi, for the award of Emeritus Fellowship. | |
dc.language.iso | en | |
dc.publisher | SPRINGER | |
dc.relation.ispartof | APPLIED PHYSICS B-LASERS AND OPTICS | |
dc.subject | CR3+ IONS | |
dc.subject | CRYSTAL | |
dc.subject | EMISSION | |
dc.subject | EPR | |
dc.subject | LUMINESCENCE | |
dc.subject | NANOCRYSTALS | |
dc.subject | OPTICAL SPECTROSCOPY | |
dc.subject | Optics | |
dc.subject | Physics | |
dc.subject | Physics, Applied | |
dc.subject | SPECTRA | |
dc.subject | SPIN-RESONANCE | |
dc.subject | TEMPERATURE | |
dc.title | Electron paramagnetic resonance and photoluminescence properties of alpha-Al2O3:Cr3+ phosphors | |
dc.type | journal article | |
dc.identifier.doi | 10.1007/s00340-012-4993-x | |
dc.identifier.isi | ISI:000304166900034 | |
dc.description.volume | 107 | |
dc.description.issue | 2 | |
dc.description.startpage | 489 | |
dc.description.endpage | 495 | |
dc.contributor.orcid | 0000-0002-4716-3240 | |
dc.contributor.orcid | 0000-0003-0576-3130 | |
dc.contributor.researcherid | ABE-7811-2020 | |
dc.contributor.researcherid | AAN-5764-2021 | |
dc.publisher.place | 233 SPRING ST, NEW YORK, NY 10013 USA | |
dcterms.isPartOf.abbreviation | Appl. Phys. B-Lasers Opt. | |
crisitem.author.dept | Institut für Chemie neuer Materialien | - |
crisitem.author.deptid | institute11 | - |
crisitem.author.orcid | 0000-0002-9686-8810 | - |
crisitem.author.parentorg | FB 05 - Biologie/Chemie | - |
crisitem.author.grandparentorg | Universität Osnabrück | - |
crisitem.author.netid | HaMa954 | - |
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geprüft am 07.06.2024