Highly uniform YBO3 hierarchical architectures: Facile synthesis and tunable luminescence properties

Abstract

Highly uniform pancake-like YBO3 hierarchical architectures have been successfully prepared by a designed two-step hydrothermal method. Yttrium precursor microprisms were first synthesized according to a simple hydrothermal route. Subsequently, nearly monodisperse multilayered YBO3 products with a pancake-like shape were synthesized at the expense of the precursor during the hydrothermal process. The whole process was carried out under aqueous conditions without the use of any organic solvent, surfactant, or catalyst. The conversion process from the precursor to YBO3 products has been investigated by time-dependent XRD experiments. Extending this method, other LnBO3 (Ln=Ho, Er, Tm, Yb) samples with well-defined shape and dimensionality have also been obtained by a similar synthetic process. The luminescence colors of YBO3 samples co-doped with Eu3+ and Tb3+ under ultraviolet or low-voltage electron beam excitation can be tuned from red, through yellow and green-yellow, to green by simply adjusting the relative doping concentrations of the activator ions. This merit of multicolor emissions in the visible region endows materials of this kind with potential application in the fields of light-display systems and optoelectronic devices. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.