A new class of Yb–Tm co-doped nano-phase separated yttrium–germanium–aluminium–phospho–silica composite optical fiber has been fabricated using a modified chemical vapour deposition process with a solution doping technique in order to achieve more intense up-conversion luminescence in visible region. A strong 474 nm up-conversion luminescence, along with three peaks at 364, 650 and 790 nm of Tm3+, have been detected under excitation at 975 nm.
The observation of a 474 nm strong up-conversion emission in comparison with other three emission peaks is explained using energy transfer coefficient values obtained from kinetic model of energy transfer up-conversion process. The strong up-conversion emission (474 nm) of yttrium–germanium–aluminium–phospho–silica composite optical fibers compared to yttrium–aluminium–silicate composite fiber is detected due to the high value of third energy transfer coefficient (W 3) associated with the 474 nm emission. Tm–Yb doped nano-engineered optical fibers would be suitable for efficient power tunable 474 nm light source for several applications.
Halder, A., Paul, M.C., Bhadra, S.K., Bysakh, S., Das, S. and Pal, M., 2015. Fabrication and Spectroscopic Analysis of Yb–Tm Co-Doped Nano-Phase Separated Yttrium–Germanium–Aluminium–Phospho–Silicate Composite Glass Optical Fibers. Science of Advanced Materials, 7(4), pp.631-642.
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Categories: Material & Chemical