Up conversion luminescence in bismuth-germanate oxide glasses co-doped with lanthanide ions

摘要

In this article, bismuth-germanate oxide glasses doped and co-doped with rare earth ions have been synthesized. Fabricated glass is characterized by good thermal stability (AT =127 °C) which are necessary for further forming them into photonic waveguides and low phonon-energy (hω = 724 cm~(-1)), much important in upconversion processes. Besides, presented glasses have a low absorption coefficient (< 0.5 cm~(-1)) in examined visible wavelength range. Upconversion luminescence spectra under 980 nm laser diode excitation have been observed in glasses doped with Er~(3+) and co-doped with Er~(3+)/Eu~(3+), Er~(3+)/Ho~(3+), Er~(3+)/Pr~(3+) and Er~(3+)/Nd~(3+) ions. According to emission parameters analysis, higher luminescence intensity in co-doped samples resulting from energy transfer phenomenon between active ions was observed. This demonstrates that bismuth-germanate oxide glass co-doped with proper rare earth elements system is an attractive material for applications working in visible range.