Up-conversion luminescence of Tb^3+ ions in germanate glasses under diode-laser excitation of Yb^3+

• DOI: 10.1364/ome.4.001050
• Publication Date: 2014-04-30T18:30:08Z
• Authors: Marcin Kochanowicz; Dominik Dorosz; Jacek Zmojda; Jan Dorosz; Joanna Pisarska; Wojciech A. Pisarski
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Up-conversion luminescence processes of Tb3+ ions in GeO2-Ga2O3-BaO glass system were investigated under diode-laser excitation of Yb3+. Emission bands at 489, 543, 586 and 621nm corresponding to 5D4→7FJ (J = 6, 5, 4, 3) transitions and luminescence at 381, 415, 435 nm resulting from 5D3, 5G6→7FJ (J = 6, 5, 4) transitions of Tb3+ were observed. The highest up-conversion emission intensity was obtained for 0.7Yb2O3/0.7Tb2O3 co-doped lead-free germanate glass. The energy transfer coefficient was determined based on fitting of calculations and experimental results by least squares method. The energy transfer coefficient amounts to Cf = 1.5∙10−33 cm6/s while quantum efficiency of the Yb3+→Tb3+ energy transfer is 12%.