Open AccessDown- and up-conversion of femtosecond light pulse excitation into visible luminescence in cerium-doped Lu_2SiO_5 – Gd_2SiO_5 solid solution crystals co-doped with Sm^3+ or Dy^3+
Author(s) -
W. RybaRomanowski,
B. Macalik,
M. Berkowski
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.004552
Subject(s) - luminescence , materials science , excited state , femtosecond , excitation , doping , cerium , analytical chemistry (journal) , photon upconversion , optics , atomic physics , optoelectronics , chemistry , laser , physics , quantum mechanics , chromatography , metallurgy
Luminescence phenomena following femtosecond pulse excitation in UV and IR of Ce(3+) + Sm(3+) and Ce(3+) + Dy(3+) systems in Lu(2)SiO(5) - Gd(2)SiO(5) single crystals are investigated. Effect of excitation wavelength in the UV on Ce(3+) luminescence is interpreted assuming selective excitation of weakly interacting Ce1 and Ce2 sites. IR-excited up-converted spectra differ as compared to UV-excited spectra in that the contribution of Sm(3+) or Dy(3+) luminescence is higher and the Ce(3+) luminescence originates essentially in Ce1 sites. It has been concluded that excitation mechanism of up-conversion involves energy transfer from free electrons created in conduction band of the host.