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A Novel 3D Architecture of GdPO4 Nanophosphors: Multicolored and White Light Emission
journal contribution
posted on 2013-02-06, 00:00 authored by Ana I. Becerro, Sonia Rodríguez-Liviano, Alberto J. Fernández-Carrión, Manuel OcañaHomogeneous monoclinic GdPO4 particles composed
of three
intersecting lance-shaped crystals forming a penetration twin have
been synthesized following a very restrictive, simple, and fast (10
min) method consisting of the hydrothermal reaction of gadolinium
acetylacetonate with H3PO4 in a mixture of ethylene
glycol and water at 180 °C. Slightly increasing the amount of
water in the solvent mixture leads to hexagonal rodlike GdPO4·0.5H2O nanoparticles, whereas the variation of the
Gd source, PO4 source, aging temperature, and polyol type
gave rise to heterogeneous particles. The synthesis procedure is also
suitable for the preparation of Eu3+-, Tb3+-,
and Dy3+-doped GdPO4 particles with the same
morphology and crystalline structure as the undoped materials. The
effect of the doping level on the luminescent properties of the twinlike
nanophosphors was evaluated, finding optimum doping levels of 5, 5,
and 1% for the Eu3+-, Tb3+-, and Dy3+-doped materials, respectively. The twinlike GdPO4 nanophosphors
were found to be more efficient than the rodlike GdPO4 ones
in terms of emission intensity. Finally, a solid-state single-phase
white-light-emitting nanophosphor has been fabricated for the first
time in this system by triply doping the GdPO4 twined particles
with appropriate concentrations of Eu3+, Tb3+, and Dy3+ and exciting through the Gd–Ln energy-transfer
band at 273 nm. In addition to this energy transfer band, other energy
charge transfer processes among the three dopants (Eu3+, Tb3+, and Dy3+) have been observed in the
triply doped material.
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triply dopingenergy transfer bandrodlike GdPO 4 onestwinlike GdPO 4 nanophosphorsdoping levelenergy charge transfer processesNovel 3 D Architecturegadolinium acetylacetonateethylene glycolGdPO 4 particlesGdPO 4 Nanophosphorshydrothermal reactiondoping levels273 nmEuH 3POsynthesis proceduretwinlike nanophosphorsemission intensityundoped materialsGd sourceTbpolyol typeDyWhite Light EmissionHomogeneousPO 4 sourceGdPO 4
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