Compositional dependence of up-conversion process in Tm3+-Yb3+ codoped oxyfluoride glasses and glass-ceramics

Citation
Fc. Guinhos et al., Compositional dependence of up-conversion process in Tm3+-Yb3+ codoped oxyfluoride glasses and glass-ceramics, J ALLOY COM, 323, 2001, pp. 358-361
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
09258388 → ACNP
Volume
323
Year of publication
2001
Pages
358 - 361
Database
ISI
SICI code
0925-8388(20010712)323:<358:CDOUPI>2.0.ZU;2-7
Abstract
Up-conversion of infrared radiation to the visible and ultraviolet regions in PbF2-GeO2-Al2O3 -Tm2O3-Yb2O3 oxyfluoride glasses and glass ceramics was obtained, exciting at 1.0 mum with a diode laser at room temperature. Trans parent films and microspheres were prepared by a modified spin-coating tech nique. The effect of host composition on the up-conversion luminescence was studied in order to improve the ultraviolet radiation generation. In the g lass samples, the Tm3+ blue (4786 Angstrom) and red (6500 Angstrom) visible emissions got more intense as the PbF2 content was increased. The main Tm3 + blue emission (4786 Angstrom,(1)G(4)--> H-3(6)), results from a three-pho ton process. A second blue emission (4500 Angstrom, D-1(2)--> F-3(4)), foll owed by a UV emission (3650 and 3850 Angstrom, D-1(4)--> H-3(6)) was observ ed in the (2PbF(2)/GeO2) glass ceramics, in a narrow range of Al2O3 concent ration. The D-1(2) level of the Tm3+ ions is populated by a fourth photon f rom the cross-relaxation process given by (F-3(4), (1)G(4))-->(H-3(6),D-1(2 )). (C) 2001 Elsevier Science B.V. All rights reserved.