In this paper we investigate the infrared-to-visible upconversion luminescence in bulk crystals and nanocolloid filled
photonic crystal fiber with ytterbium and erbium co-doped NaYF4 upconversion phosphor. The phosphor was prepared
by using simple co-precipitation synthetic method. The initially prepared phosphor has very weak upconversion
fluorescence. The fluorescence significantly increased after the phosphor was annealed at a temperature of 400°C.
Nanocolloids of this phosphor were obtained using water and methanol as solvents and they were utilized as laser filling
medium in photonic crystal fibers. Under 980nm laser excitation very strong upconversion signals were obtained at 408
nm, 539 nm and 655 nm. Efficiency and decay life time study of the upconverted emissions was conducted to
understand the upconversion mechanisms. The reported nanocolloids are good candidates for fluorescent biosensing
applications and also as a new laser filling medium in fiber lasers.
Nanocolloids of compounds containing fluorescent rare earth ions have recently attracted significant attention as agents for
biolabeling, bioimaging, bio- and chemical sensing, and other applications. Erbium oxide nanocolloids have been prepared
for the first time in water and gammabutyrolactone. Optical dynamic scatterometry and atomic force microscopy determined
an average size (average mean height) of erbium oxide nanoparticles to be 10-11 nm. Prominent optical absorption peaks of
the nanocolloids at 442.5 nm, 450.0 nm, 487.2 nm (strong), 492.0 nm, 523.0 nm (strong), 541.6 nm, 548.6 nm, 652.6 nm, and
665.7 nm (strong) can be attributed to erbium ions hosted within nanoparticles. Laser fluorescence spectroscopy of the
nanocolloids was conducted using excitations with the lines of argon-ion laser (514 nm, 488 nm, 476 nm, and 458 nm) and
980-nm semiconductor laser. Strong green emission at 571 nm is more likely from transition between 4S3/2 and 4I15/2 levels
and relatively weak red emissions from transition between 4I9/2 and 4I15/2 level of erbium was observed at excitation with
visible laser radiation 488 nm and 476 nm. The reported nanocolloids thus showed to be good candidates for fluorescent
biosensing applications and also as a new lasing filling medium in fiber lasers.
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