Optical spectroscopy and local structure of the Nd3+ luminescence centres in glasses of the CaO-Ga2O3-GeO2 system

• Autorzy: Padlyak B. , Ryba-Romanowski W. , Lisiecki R.
• Języki publikacji: EN

Abstrakty

EN

Optical absorption and luminescence spectra as well as luminescence kinetics of the Nd3+ centres in glasses with Ca3Ga2Ge3O12:Nd composition, containing 0.2 and 1.0 wt% of the Nd2O3 were presented and analysed. The oscillator strengths and phenomenological intensity parameters omega t (omega 2, omega 4, and omega 6) were obtained using standard Judd-Ofelt theory. Calculated omega t parameters, radiative transitions rates, branching ratios and radiative lifetime for Nd3+ centres in the glass with Ca3Ga2Ge3O12 composition were analysed and compared with corresponding Nd3+ parameters in their crystalline analogue with garnet structure. Experimental lifetimes are compared with those calculated, and quantum efficiency of Nd3+ centres from 4F3/2 emitting level in the glass with Ca3Ga2Ge3O12 composition is estimated. Incorporation peculiarities and local structure of Nd3+ luminescence centres in the glass with Ca3Ga2Ge3O12 composition and corresponding Ca3Ga2Ge3O12:Nd3+ garnet laser crystals are considered. On the basis of extended X-ray absorption fine structure (EXAFS) spectra (L3-edge) of rare-earth elements analysis it has been shown that Nd3+ luminescence centres in the CaO-Ga2O3-GeO2 glass network occupy structural sites with the coordination number to oxygen N = 6.

Słowa kluczowe

EN

germanate glasses; Nd3+ centre; optical absorption; luminescence; decay kinetics; extended X-ray absorption fine structure (EXAFS); local structure

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2008
• Tom: Vol. 38, nr 1
• Strony: 189--202
• Opis fizyczny: Bibliogr. 44 poz.

Twórcy

autor

Padlyak B.

autor

Ryba-Romanowski W.

autor

Lisiecki R.

• Institute of Physical Optics of the Ministry of Education and Science of Ukraine, 23 Dragomanov Str., 79-005, Lviv, Ukraine

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