Combustion Synthesis and Photoluminescence Properties of YNbO₄-Based Nanophosphors

Abstract

YNbO 4 and YNbO 4 :RE (RE ) Er 3+ , Sm 3+ , Tb 3+ , and Tm 3+ ) nanophosphors have been prepared using a citrate-gel combustion procedure. The results of X-ray diffraction reveal that the YNbO 4 samples crystallized in both monoclinic and tetragonal phases in the investigated temperature range. The excitation spectra of the undoped YNbO 4 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 YNbO 4 . Upon UV excitation of the niobate host, characteristic emissions from f-f transitions of the RE ions were observed. The luminescence covers the blue (Tm 3+ ), green (Er 3+ , Tb 3+ ), and orange-red (Sm 3+ ). The mechanism of the energy transfer between the niobate host and the RE ions was deduced.

Direct synthesis of nanocrystalline GdNbO₄ and GdNbO₄-based phosphors doped with Eu³⁺ through hydrothermal route

“…20), 21) The rare-earth niobate has been of much interest due to its potential properties, e.g., luminescence, 22) ionic conductivity, 23) photocatalytic activity, 24) and magnetic properties. 25) Many studies on the synthesis and characterization of rare earth niobate have been done using several preparation methods such as solid state reaction, 26),27) flux method, 28),29) combustion synthesis, 30) the method based on complexes, 31) hydrothermal method, 32), 33) and co-precipitation. 34 ) in the Teflon container was then placed in a stainless-steel vessel.…”

Up-conversion luminescence, temperature sensing properties and laser-induced heating effect of Er3+/Yb3+ co-doped YNbO4 phosphors under 1550 nm excitation

“…Among various oxide matrixes, ANbO 4 (A = Gd, Y, La) compounds, with a fergusonite structure and low phonon energy, are good host candidates for UC luminescence phosphors 17–22 . Recently, the UC luminescence properties of Er 3+ /Yb 3+ co-doped ANbO 4 materials under 980 nm excitation have been reported 17,18 . It was found that the ANbO 4 host presented high chemical and physical stabilities, low lattice vibration energy and high accommodating concentration for RE luminescent centers; additionally they can be easily prepared via the traditional solid-state reaction method.…”

Transparent glass–ceramics with (Eu3+,Yb3+):YNbO4 nanocrystals: Crystallization, structure, optical spectroscopy and cooperative upconversion

“…Yttrium orthoniobate, YNbO 4 , is a self-activated X-ray phosphor widely used in X-ray medical imaging, in computed radiography, tomography and fluoroscopy [53]. YNbO 4 is an excellent luminescent host because yttrium ions are easily replaced by other rare-earth ions.…”