In the present paper, the concentration effect of near-infrared quantum cutting of Tm3+ion in(Y1-xTmx)3Al5O12powder phosphor is studied by means of experiments and calculations. In addition, the absorption spectra, visible-to-nearinfrared excitation and emission spectra, and fluorescence lifetimes are measured. It is found that(Y1-xTmx)3Al5O12powder phosphor has a strong four-photon near-infrared quantum cutting luminescence of 1788.0-nm3F4→3H6fluorescence of Tm3+ion, when excited by 357.0-nm light. It is also found that the up-limit of the four-photon near-infrared quantum cutting luminescence efficiency of(Y0.700Tm0.300)3Al5O12powder phosphor is approximately 302.19%. To the knowledge of the authors, this is the first time that a near-infrared quantum cutting efficiency up-limit exceeding 300% has been reported. The results of this manuscript are valuable in aiding the probing of the new generation Ge solar cell.
We numerically simulate a photonics phenomenon of what we call intensity inversion between red and green fluorescence in oxyfluoride nanophase vitroceramics Er(1%)Yb(8%):FOV through the integration of whole fluorescence’s theories.We found that it is essential to introduce a coefficient presenting the difference between the Stokes energy transfer and anti-Stokes energy transfer processes in nano-material when calculating the energy transfer rate.Under this consideration,and with the total crystallized volume ratio set to be 17.6%,the simulation results of the population probabilities values of all energy levels of Er^(3+) ion are coincident with the experimental result perfectly.
