The 18th International Theophilus Symposium (IFAC-2022) on Spectroscopy of Crystals Activated by Ions of Rare Earths and Transition Metals (August 22-26, 2022, Moscow)
Nanophotonics
New upconversion bulk and nanophosphors based on the Sr$_2$Y$_{8-x-y}$Yb$_y$Tm$_x$Si$_6$O$_{26}$
M. G. Zueva,
A. A. Vasina,
V. G. Ilvesb,
S. Yu. Sokovninbc a Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Yekaterinburg, Russia
b Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
c Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia
Abstract:
Polycrystalline phosphors with a Sr
$_2$Y
$_{8-x-y}$Yb
$_y$Tm
$_x$Si
$_6$O
$_{26}$ (
$x$ = 0.005–0.5,
$y$ = 0.2, 0.3) total formula were synthesized. Nanoluminophor has been obtained from the Sr
$_2$Y
$_{8-x-y}$Yb
$_y$Tm
$_x$Si
$_6$O
$_{26}$ microcrystalline sample by the vacuum electron been evaporation, in the amorphous state, with the
$\sim$10.6 nm particle size. It is found, raman spectra undergoing modification by the transition from bulk- to nanosize state. Photoluminescene spectra micro- and nanophosphors are studied. Intensity of the blue emission, by the UV ligth excitation, grows in the
$x$ = 0.005–0.02 region, with the
$x$ increasing. Upconversion photoluminescence (UPCL) spectra of the bulk phosphors and nanosample based on the Sr
$_2$Y
$_{8-x-y}$Yb
$_y$Tm
$_x$Si
$_6$O
$_{26}$ were measurd. At the pumping power around 70.8 mW, by the laser source with the
$\lambda$ = 980 nm, thereshold population of the
$^3F_3$ level of Tm
$^{3+}$ ions exist. At a power higher 70.8 mW, a sharp increase of the luminescence intensityof the bulk- and nanophosphor occurs. For the
$^3H_4\to{}^3H_6$ transition thereshold pumping power absent. This indicates that, pumping, during Yb
$\to$ Tm energy transer, is a single photon process.
Keywords:
photoluminescence, Tm$^{3+}$, Yb$^{3+}$ ions, Raman spectra. Received: 14.10.2022
Revised: 07.11.2022
Accepted: 24.11.2022
DOI:
10.21883/OS.2023.05.55721.55-22
Fulltext:
PDF file (825 kB)