PREPARATION OF ALUMINUM-YTTRIUM GARNET LUMINSCENT
CERAMIC ALLOYED WITH CERIUM
Yu. G. Trifonov,
D. E. Kuznetsova,
G. A. Dosovitskii,
A. Yu. Omarov,
R. A. Novoselov,
and V. P. Tarasovskii
Translated from Novye Ogneupory, No. 5, pp. 52 – 57, May 2015.
Original article submitted October 27, 2014.
Results are provided for a study of the mechanical and luminescence properties of aluminum-yttrium garnet
ceramic specimens alloyed with cerium (Y
). Specimens are prepared from nanostructured
powder with a primary particle size of the order of 50 nm prepared by coprecipitation, compaction, and
Keywords: luminescent ceramic, aluminum-yttrium garnet, alloyed with cerium (YAG:Ce), photolumi
nescence, microhardness, impact strength.
Aluminum-yttrium garnet, activated with cerium
, YAG:Ce), is a basis for the most widespread
luminophores for obtaining white light in solid-state illumi-
nation sources [1 – 3]. It exhibits a photo-excitation with a
maximum at 460 – 470 nm, coinciding with the radiation
maximum for the most widespread blue light diodes based
on (In, Ga)N. The maximum photoluminescence band for
YAG:Ce is observed with a wavelength of 530 nm, and for
) with a
wavelength up to 565 nm [4, 6]. Recently the area has been
developed of so-called ceramic luminophores not requiring
an organic binder for application to a light diode surface,
whose degradation leads to worsening of light diode proper
ties [7 – 10]. Currently nanostructured powders are used in
order to prepare highly dense ceramic. One of the most effi
cient methods for preparing nanostructured aluminum-yt
trium garnet powder is combined precipitation from aqueous
solutions [11, 12].
For practical use of luminescent ceramic based on
YAG:Ce important parameters are its microhardness and im
pact strength, and spalling with impact under production and
operating conditions. Ceramic of unalloyed aluminum-yt-
trium garnet has been considered as a promising structural
material due to its good high-temperature strength [13 – 16].
However, information concerning a study of mechanical
properties of aluminum-yttrium garnet ceramic alloyed with
cerium has not been detected by the authors. The work pro-
posed is devoted to obtaining dense YAG:Ce ceramic and de
termining its luminescence properties, ultimate strength in
bending (impact strength), and microhardness.
The starting compounds used were yttrium oxide 99.99%
pure, chemically pure aluminum nitrate subjected to addi
tional purification, and chemically pure cerium nitrate. Anal
ysis of the impurity composition of yttrium oxide and alumi
num nitrate was performed by mass spectrometry with ion
ization by an inductively-coupled plasma (ICP-MS) in an
Elan DRC-e instrument (PerkinElmer, USA), and atomic
emission spectroscopy with ionization by an inductively-
coupled plasma (ICP-AES) in an ICAP 6300 Duo instrument
(Thermo Scientific, USA).
Powder was prepared by coprecipitation from liquid so
lution. For this purpose calculated amounts of aluminum and
cerium nitrates were dissolved in water, and yttrium oxide
was dissolved in chemically pure nitric acid. Then the solu
tions were mixed in order to obtain a stoichiometric ratio of
Refractories and Industrial Ceramics Vol. 56, No. 3, September, 2015
1083-4877/15/05603-0271 © 2015 Springer Science+Business Media New York
FGUP IREA State Order of the Red Banner Scientific Research
Institute of Chemical Reactions and Specially Pure Chemical
Substances, Moscow, Russia.
FGBOU VPO Moscow State Industrial University, Russia.
ZAO NTTs Bakor, Moscow, Russia.