Abstract
The
${{Er}}^{3+}$
–
${{Tm}}^{3+}$
–
${{Yb}}^{3+}$
codoped
${{La}}_{2} {{O}}
_{3}$
phosphor has been prepared by an instant product
forming low-temperature combustion method and its structure has been
analyzed by using XRD method and FESEM analysis. The vibrational modes
and optical upconversion emission study has been performed by using
the FTIR spectroscopy and 980 nm laser diode excitation respectively.
The temperature sensing based on the optical heating produced on increasing
the pump power density in the developed phosphor has been performed.
The upconversion emission study shows six bands around
${\sim} {410}~{{nm}}$
,
${\sim}
{525}~{{nm}}$
,
${\sim} {548}~{{nm}}$
,
${{\sim}} {665}~{{nm}}$
,
${{\sim}}
{476}~{{nm}}$
, and
${\sim} {795}~{{nm}}$
corresponding to the
$^{2} {\rm H} _{9/2}{\rightarrow}^{4}{\rm I} _{15/2}$
,
$^{2}
{\rm H} _{11/2} {\rightarrow}^{4}{\rm I} _{15/2}$
,
$^{4} {\rm S} _{3/2} {\rightarrow}^{4}{\rm
I} _{15/2}$
,
$^{4} {\rm F} _{9/2} {\rightarrow}^{4}{\rm I} _{15/2}$
,
$^{1}
{G} _{4} {\rightarrow}^{3}{\rm H} _{6}$
,
$^{1} {G} _{4} {\rightarrow}^{3}{\rm
H}_{5}$
transitions of
${{Er}}^{3+}$
and
${{Tm}}^{3+}$
ions, respectively. The color emitted from the different
samples is observed to vary from bluish green to yellowish green region
via pure green region. The rise and decay times for the
${{\sim}} {476}~{{nm}}$
and
${{\sim}}
{525}~{{nm}}$
bands originating due to the
$^{1} {G} _{4} {\rightarrow}
^{3} {\rm H} _{6}$
(
${{Tm}}^{3+}$
ion) and
$^{2} {\rm H} _{11/2} {\rightarrow}
^{4} {\rm I} _{15/2}$
transitions (
${{Er}}^{3+}$
ion), respectively, for one of the samples have been monitored.
With the suitable rare earth ions doping concentration the developed
phosphor shows white light upconversion emission upon excitation at
980 nm.
© 2015 IEEE
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