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Facile Synthesis of Bastnaesite ‐Type LaF[CO 3 ] and Its Thermal Decomposition to LaOF for Bulk and Eu 3+ ‐Doped Samples
Author(s) -
Janka Oliver,
Schleid Thomas
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800931
Subject(s) - chemistry , thermal decomposition , lanthanide , luminescence , doping , fluoride , metal , powder diffraction , oxide , decomposition , europium , inorganic chemistry , ion , crystallography , organic chemistry , materials science , optoelectronics
Rare‐earth metal(III) oxide fluorides with the composition MOF (M = La–Lu) seem to offer promising host lattices for luminescence applications by doping these materials with trivalent lanthanoid cations. Unfortunately, there was no simple and practicable way to synthesize the compounds in phase‐pure quality with classical solid‐state chemistry reactions. However, by using the rare‐earth metal(III) fluoride oxocarbonates, MF[CO 3 ], as solution‐born precursor materials that crystallize with a bastnaesite ‐type structure, easy access is now possible by mild thermal decomposition. Synthetic details, investigations on the phase purity and the presence of the oxocarbonate anion [CO 3 ] 2– proved by IR measurements as well as from X‐ray powder diffraction data are given in this paper for the example of bulk LaF[CO 3 ] and Eu 3+ ‐doped samples. The latter (LaF[CO 3 ]:Eu 3+ ) shows a bright orange‐red luminescence that is stronger than that of the product of its thermal decomposition: trimorphic LaOF:Eu 3+ .(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)