Optical spectroscopy of the Er-doped glasses with 3CaO–Ga2O3–3GeO2 composition

✍ Scribed by B. Padlyak; O. Vlokh; K. Fabisiak; K. Sagoo; B. Kukliński

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 193 KB
• Volume: 28
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2004.10.038

✦ Synopsis

Optical absorption, emission and luminescence excitation spectra as well as the luminescence kinetics of the Er 3+ ions (amount of Er-0.7 wt.%) in glasses with garnet Ca 3 Ga 2 Ge 3 O 12 (or 3CaO-Ga 2 O 3 -3GeO 2 ) composition were investigated in the UV-visible spectral region. By optical spectroscopy it was shown that the erbium is incorporated into the glass network as Er 3+ ions (4f 11 electron configuration, 4 I 15/2 free ion ground state), exclusively. All observed transitions of the Er 3+ ions in glasses with 3CaO-Ga 2 O 3 -3GeO 2 composition in the UV-visible spectral region were identified. Optical spectra of the Er 3+ ions can be analysed in the framework of Judd-Ofelt theory. The Er 3+ luminescence decay curve for 4 S 3/2 ! 4 I 15/2 transition (k max = 555 nm) obtained at room temperature was satisfactory described by two-exponential approximation with lifetimes s 1 = 10.6 ls and s 2 = 22.4 ls. The peculiarities of spectroscopic properties, luminescence kinetics and local structure of the Er 3+ centres in the glasses with 3CaO-Ga 2 O 3 -3GeO 2 composition are discussed.