Ukrainian Journal of Physical Optics

Number 1, Volume 6, 2005

Spectroscopy and Luminescence Kinetics of Eu3+, Ho3+ and Er3+ Centres in the Glass With 3CaO-Ga2O3-3GeO2 Composition
^1,2Padlyak B., ¹Vlokh O., ³Sagoo K.

¹Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine
²Department of Physics, Academy of Bydgoszcz, 11 Weyssenhoff Sq., 85-072 Bydgoszcz, Poland
³Jobin Yvon IBH Ltd., 45 Finnieston St., G3 8JU Glasgow, UK

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The UV-visible optical absorption, luminescence excitation and the emission spectra of Eu3+, Ho3+ and Er3+ impurity ions in Eu-, Ho- and Er-doped glasses of CaO-Ga2O3-GeO2 system registered at room and liquid-nitrogen temperatures are presented. Luminescence decay curves of the impurity centres in the glass with Ca3Ga2Ge3O12 (or 3CaO-Ga2O3-3GeO2) garnet composition are obtained and analysed. The decay curves at the room temperature are described satisfactorily using a two-exponential approximation. We have the characteristic lifetimes t1 =0.90 ms and t2 = 1.55 ms for the Eu3+ centres (5D0 - 7F2 transition, lmax = 615 nm), t1 = 3.9 ms and t2 = 7.5 ms for Ho3+ (5S2 - 5I8 transition, lmax = 545 nm) and t1 = 10.6 ms, t2 = 22.4 ms and t1 = 10.7 ms, t2 = 25.0 ms for Er3+ (4S3/2 - 4I15/2 transition, lmax = 555 nm and 2H11/2 - 4I15/2 transition, lmax =545 nm), respectively. Basing on the optical spectra and the luminescence kinetics analysis for Eu3+, Ho3+ and Er3+, the two sites with different local environments are proposed for the rare-earth ions in the 3CaO-Ga2O3-3GeO2 glass surroundings. A possible local structure of the luminescence centres in the glass with 3CaO-Ga2O3-3GeO2 composition is discussed.

Keywords: glasses of CaO-Ga2O3-GeO2 system; Eu3+ ion; Ho3+ ion; Er3+ ion; optical absorption; luminescence; decay time

PACS: 78.40.-q, 78.55.Hx, 71.55.-I, 78.45.+h, 78.20.Bh

doi 10.3116/16091833/6/1/33/2005

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