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Er 3+  activated germanate glasses modified by La 2 O 3  and Y 2 O 3  with good thermal stability were prepared. 2.7 μm fluorescence was observed and corresponding radiative properties were investigated. A detailed discussion of J–O parameters has been carried out based on absorption spectra and Judd–Ofelt theory. The peak emission cross sections of La 2 O 3  and Y 2 O 3  modified germanate glass are (14.3 ± 0.10) × 10 −21  cm 2  and (15.4 ± 0.10) × 10 −21  cm 2 , respectively. Non-radiative relaxation rate constants and energy transfer coefficients of  4 I 11/2  and  4 I 13/2  levels have been obtained and discussed to understand the 2.7 μm fluorescence behavior. Moreover, the energy transfer processes of  4 I 11/2  and  4 I 13/2  level were quantitatively analyzed according to Dexter’s theory and Inokuti–Hirayama model. The theoretical calculations are in good agreement with the observed 2.7 μm fluorescence phenomena. Results demonstrate that the Y 2 O 3  modified germanate glass, which possesses more excellent spectroscopic properties than La 2 O 3  modified germanate glass, might be an attractive candidate for mid-infrared laser.

R2O3 (R = La, Y) modified erbium activated germanate glasses for mid-infrared 2.7 μm laser materials