Blue, green and red upconversions in Ho2O3-doped fluorophosphate glasses
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Blue, green and red upconversions in Ho2O3-doped fluorophosphate glasses
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| Creator |
Karmakar, Basudeb
Annapurna, K |
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| Subject |
Glass
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| Description |
Near infrared (NIR) to visible upconversions of a fluorophosphate glass of composition (mol%) 7Ba(PO3)(2)-32AlF(3)-30CaF(2)-18SrF(2)-13MgF(2) doped with various concentrations (0. 1, 0. 3 and 1.0 mol%) of Ho2O3 have been investigated by exciting at 892 nm at room temperature. Three upconverted bands originated from the F-5(3) -> I-5(8), (S-5(2), F-5(4)) -> I-5(8), and F-5(5) -> I-5(8) transitions have been found to center at 491 nm (blue), 543 ran (green) and 658 nm (red), respectively. These bands have been justified from the evaluation of the absorption, normal (down conversion) fluorescence and excitation spectra. The upconversion processes have been interpreted by the excited state absorption (ESA), energy transfer (ET) and cross relaxation (CR) mechanisms involving population of the metastable (storage) energy levels by multiphonon deexcitation effect. It is evident from the infrared reflection spectral (IRRS) analysis that the upconversion phenomena are expedited by the low multiphonon relaxation rate in fluorophophate glasses owing to their high intense low phonon energy of similar to 600 cm(-1) which is very close to that of fluoride glasses (500-600 cm(-1)).
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| Publisher |
Elsevier
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| Date |
2007-05-15
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/463/1/J_Non%2DCryst_Solid_353_(2007)_1377.pdf
Karmakar, Basudeb and Annapurna, K (2007) Blue, green and red upconversions in Ho2O3-doped fluorophosphate glasses. Journal of Non-Crystalline Solids, 353 (13-15). pp. 1377-1382. ISSN 0022-3093 |
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| Relation |
http://www.journals.elsevier.com/journal-of-non-crystalline-solids/
http://cgcri.csircentral.net/463/ |
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