Abstract
A modification of the Pechini method was applied to obtain luminescent rare earth orthophosphates. The developed synthetic route is based on the ability of the tripolyphosphate anion (\({\text{P}}_3 {\text{O}}_{10}^{5 - } \)) to act both as a complexing agent and as an orthophosphate precursor. Heating of aqueous solutions containing RE3+, Eu3+, \({\text{P}}_3 {\text{O}}_{10}^{5 - } \), citric acid, and ethylene glycol led to polymeric resins. The ignition of these resins at different temperatures yielded luminescent orthophosphates. The produced nanosized phosphors (YPO4:Eu3+, (Y,Gd)PO4:Eu3+, and LaPO4:Eu3+) were analyzed by infrared and luminescence spectroscopies, X-ray diffractometry, and scanning electron microscopy.
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The authors thank Dr. R.F. Silva and Dr. C.R. Neri for helpful discussions, and the Brazilian agencies CAPES, CNPq, and FAPESP for financial support.
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de Sousa Filho, P.C., Serra, O.A. Tripolyphosphate as Precursor for REPO4:Eu3+ (RE = Y, La, Gd) by a Polymeric Method. J Fluoresc 18, 329–337 (2008). https://doi.org/10.1007/s10895-007-0272-3
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DOI: https://doi.org/10.1007/s10895-007-0272-3