Energy transfer studies in Eu3+-doped lead–niobium–germanate glasses

✍ Scribed by R. Balda; J. Fernández; L.M. Lacha; M.A. Arriandiaga; J.M. Fernández-Navarro

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 159 KB
• Volume: 27
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2004.11.049

✦ Synopsis

The spectral migration of energy among Eu 3+ ions in lead-niobium-germanate glass (60GeO 2 -25PbO-15Nb 2 O 5 ) with different Eu 3+ concentrations (0.5, 1, 3, and 5 mol%) has been investigated at low temperature by using time-resolved fluorescence line narrowing (TRFLN) spectroscopy. The spectral features of the time-resolved fluorescence line-narrowed 5 D 0 ! 7 F 0 emission spectra under resonant excitation at different wavelengths along the 7 F 0 ! 5 D 0 transition as a function of time, excitation wavelength, and concentration reveal the existence of energy migration between discrete regions of the inhomogeneous broadened spectral profile. The analysis of the time evolution of the 5 D 0 ! 7 F 0 emission shows that the electronic mechanism responsible for the ion-ion interaction can be identified as a dipole-dipole energy transfer process.