Res. Chem. Intermed.
, Vol. 32, No. 3–4, pp. 331–339 (2006)
Also available online - www.vsppub.com
Preparation of nano-sized YAG:Eu
by a microwave-assisted polyol process
and their luminescence properties
, SHOZO YANAGIDA
and YUJI WADA
Department of Material and Life Science, Division of Advanced Science and Biotechnology,
Graduate School of Engineering, Osaka University, Yamadaoka, Suita 565-0871, Japan
Center for Advanced Science & Innovation, Osaka University, Yamadaoka, Suita 565-0871, Japan
Received 16 January 2005; accepted 26 February 2005
Abstract—Phases of yttrium-aluminum binary oxide have been selectively prepared by selecting a
polyol solvent in a microwave-assisted polyol process. Using 1,4-butanediol as a polyol solvent,
nano-sized particles of a pure phase of YAG have been prepared. Furthermore, Eu
has been synthesized by applying this method. We have demonstrated that 8 at% Eu
(replacement of Y
) gave the strongest emission when the content of Eu
; polyol process; microwave heating; luminescence properties.
Inorganic luminescent materials have been extensively applied to display panels,
such as plasma display panel (PDP), ﬁeld emission display (FED), and vacuum
ﬂuorescent display (VFD) [1–3]. Nano-sized particles of the inorganic materials
are needed for achieving the high resolution of these displays.
Yttrium-aluminum binary oxide is known to exist in four crystal phases [4–6]:
YAG ( Y
), YAM (Y
) , YA P ( YA l O
) a n d YA H ( YA l O
). In these
crystal phases, YAG is widely utilized as optical and luminescent materials [7–10].
A single crystal of YAG:Nd
- and luminescent center-doped poly-crystals of YAG
are extensively employed for solid-state lasers and cathode ray tubes (CRTs), re-
spectively. YAG particles have been prepared classically by a solid-state reac-
tion . This technique requires mixing alumina and yttria powders, followed
by calcination in prolonged time at high temperatures above 1873 K. In addition,
the synthesized particles are a mixture of other binary oxide phases.
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