Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 50, Pages 19901-19907Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp806246t
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YNbO4 and YNbO4:RE (RE = Er3+, Sm3+, Tb3+, and Tm3+) nanophosphors have been prepared using a citrate-gel combustion procedure. The results of X-ray diffraction reveal that the YNbO4 samples crystallized in both monoclinic and tetragonal phases in the investigated temperature range. The excitation spectra of the undoped YNbO4 samples exhibit a red-shift as annealing temperature or time increases, and the emission spectra show a broadband around 400 nm, corresponding to the self-activated luminescence center of YNbO4. Upon UV excitation of the niobate host, characteristic emissions from f-f transitions of the RE ions were observed. The luminescence covers the blue (Tm3+), green (Er3+, Tb3+), and orange-red (Sm3+). The mechanism of the energy transfer between the niobate host and the RE ions was deduced.
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