Abstract:
The variety of applications of yttriumaluminum garnet (YAG)-based luminescent
materials and the morphology necessary for
these purposes required the development of
many technologies for their synthesis. All
synthesis technologies used are complex.
The structural phase of yttrium-aluminum
garnet is formed with any technology, at
temperatures exceeding 1.500 °C. The starting
materials for the synthesis are metal oxides
of aluminum, yttrium and other oxides for
activation and modification. It seems possible
to use hard radiation to form a new phase.
Radiation synthesis of ceramics is realized in
less than 1 s, without the use of any additives
and influences.
The synthesis was carried out at the
electron accelerator of the Institute of
Nuclear Physics (Novosibirsk). In this
work, we studied the spectral-kinetic and
quantitative characteristics of luminescence
for the first time obtained by the method
of radiation synthesis of ceramic samples of
yttrium-aluminum garnet doped with cerium
with statistical processing of their values.
The dependences of the reproducibility of the
spectral characteristics of the luminescence
of the samples on the preliminary preparation
of the charge for synthesis have been
investigated. Several cycles of luminophore
brightness studies have been performed.
It is shown that the obtained ceramics
based on yttrium-aluminum garnet doped with
cerium possesses the required spectral-kinetic
properties, and the efficiency of conversion
of the chip radiation into luminescence is
achieved, which is comparable to that
available in commercial phosphors. The
maximum measured values of the position
of the bands are from 553.5 to 559.6 nm.
Brightness values range from 4.720 to
1.960 cd/m2.
It was found that the main reason for
the scatter in the characteristics of the
luminescent properties of ceramics of yttriumaluminum garnet, activated by cerium
obtained by radiation assisted synthesis is the
high rate of synthesis and, especially, the high
rate of cooling of the samples
