NDLI: Investigation of thermal decomposition of yttrium–aluminum-based precursors for YAG phosphors

Content Provider	Springer Nature Link
Author	Muresan, L. E. Popovici, E. J. Bica, E. Cadis, A. I. Perhaita, I. Tudoran, L. Barbu
Copyright Year	2012
Abstract	Three types of precursors were prepared using the wet-chemical synthesis route, starting from yttrium–europium–aluminum nitrate solution and different precipitating agents (urea, oxalic acid, and ammonium carbonate). The precursors were fired at 1200 °C in nitrogen atmosphere in order to obtain europium-doped yttrium aluminate Y$_{3}$Al$_{5}$O$_{12}$:Eu$^{3+}$ phosphor with garnet structure (YAG:Eu). The processes involved in the thermal decomposition of precursors and their composition were put in evidence using thermal analysis (TG–DTA) and FT-IR spectroscopy. The GA–DTA curves possess typical features for basic-oxalate, -nitrate, and -carbonates as formed with oxalic acid, urea, and ammonium carbonate, respectively. Correlation between the thermal decomposition steps, mass loss, and composition of gases evolved during the thermal treatment was established using TG–DTA–FT-IR coupling. It was found that the different composition of precursors reflects on the luminescent characteristics of the corresponding phosphors. Urea and ammonium carbonate lead to the formation of YAG type phosphors, with garnet structure and specific red emission. As for the oxalic acid, this precipitating agent generates a non-homogeneous powder that contains yttrium oxide as impurity phase. This phosphor is a mixture of Y$_{2}$O$_{3}$:Eu$^{3+}$, Y$_{4}$Al$_{2}$O$_{9}$:Eu$^{3+}$, and Y$_{3}$Al$_{5}$O$_{12}$:Eu$^{3+}$ that explain the relative higher emission intensity.
Starting Page	341
Ending Page	348
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	110
Issue Number	1
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-03-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Phosphors Yttrium-aluminum garnet Wet-chemical synthesis Precursors Measurement Science and Instrumentation Inorganic Chemistry Physical Chemistry Polymer Sciences Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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