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Host dependent frequency upconversion of Er3+-doped oxyfluoride germanate glasses
- Source :
- Journal of Luminescence. 117:179-186
- Publication Year :
- 2006
- Publisher :
- Elsevier BV, 2006.
-
Abstract
- Er 3+ -doped oxyfluoride germanate glasses have been synthesized by the conventional melting and quenching method. The Judd–Ofelt intensity parameters were calculated based on the Judd–Ofelt theory and absorption spectra measurements. With the substitution of PbF 2 for PbO, the Ω 2 parameter decreases, while the Ω 6 parameter increases. These change trends indicate that fluoride anions come to coordinate erbium cations and the covalency of the Er–O bond decreases. Structural and thermal stability properties were obtained by Raman spectra and differential thermal analysis, indicating that PbF 2 plays an important role in the formation of glass network and has an important influence on the maximum phonon energy and thermal stability of host glasses. Intense green and red emissions centered at 525, 546, and 657 nm, corresponding to the transitions 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 , respectively, were simultaneously observed at room temperature. With increasing PbF 2 content, the intensity of red (657 nm) emissions increases significantly, while that of the green (525 and 546 nm) emission increases slightly. The results indicate that PbF 2 has more influence on the red (657 nm) emission than the green (525 and 546 nm) emissions in oxyfluoride germanate glasses. The possible upconversion luminescence mechanisms have also been estimated and discussed.
- Subjects :
- Photoluminescence
Absorption spectroscopy
business.industry
Biophysics
Analytical chemistry
chemistry.chemical_element
General Chemistry
Condensed Matter Physics
Biochemistry
Atomic and Molecular Physics, and Optics
Photon upconversion
Erbium
symbols.namesake
Optics
chemistry
Differential thermal analysis
symbols
Thermal stability
Germanate
business
Raman spectroscopy
Subjects
Details
- ISSN :
- 00222313
- Volume :
- 117
- Database :
- OpenAIRE
- Journal :
- Journal of Luminescence
- Accession number :
- edsair.doi...........7239b5bdd629dbf62bd33b44b22494a9