Luminescence, Energy Transfer, and Upconversion Mechanisms of Y₂O₃Nanomaterials Doped with Eu³⁺,Tb³⁺, Tm³⁺,Er³⁺, and Yb³⁺Ions

Abstract

Luminescence, energy transfer, and upconversion mechanisms of nanophosphors (Y2O3 : Eu3+,Tb3+,Y2O3 : Tm3+,Y2O3 : Er3+,Yb3+) both in particle and colloidal forms were studied. The structure, phase, and morphology of the nanopowders and nanocolloidal media were determined by high-resolution TEM and X-ray diffraction. It was shown that the obtained nanoparticles have a round-spherical shape with average size in the range of 4 to 20 nm. Energy transfer was observed forY2O3 : Eu3+,Tb3+colloidal and powders, upconversion transitions were observed for bothY2O3 : Er3+andY2O3 : Er3+,Yb3+nanophosphors. The dependence of photoluminescence (PL) spectra and decay times on doping concentration has been investigated. The infrared to visible conversion of emission inY2O3 : Er3+,Yb3+system was analyzed and discussed aiming to be applied in the photonic technology.

Synthesis of Porous Europium Oxide Particles for Photoelectrochemical Water Splitting

“…Among them, Eu 2 O 3 is one of the most interesting rare earth oxides and widely used in up-conversion materials, low voltage cathodoluminescent devices, high density optical storage devices, lasers, biochemical applications, and catalysts [27][28][29][30]. It is well known that the properties of Eu 2 O 3 nanomaterials are obviously dependent on the crystallinity, crystallite size, crystallographic orientation, and morphology [28,31] Therefore, the development of a facile and effective approach to synthesize Eu 2 O 3 nanomaterials with controllable size and architecture is very desirable.…”

PMMA-Y2O3 (Eu3+) nanocomposites: Optical and mechanical properties

“…[7][8][9][10][11][12][13][14][15][16][17][18][19][20] Poly(methyl methacrylate), PMMA, nanocomposites containing Y 2 O 3 doped with rare earths (RE) ions have been investigated and it was suggest that doped Y 2 O 3 nanocrystals embedded in PMMA would have potential for various photonic applications, including laser systems and optical communication devices. 21,22 Nanocomposites PMMA-Y 2 O 3 :RE were successfully prepared by mixing Y 2 O 3 /Eu 3+ ,Yb 3+ or Y 2 O 3 /Eu 3+ with PMMA for infrared cards. 22 The Eu-ion doped Y 2 O 3 nanophosphor is useful for nanocomposite POF light guides because the luminescence wavelength of the Eu-ion (611 nm) is in the visible range of spectrum.…”

Influence of carbon templates and Yb3+ concentration on red and green luminescence of uniform Y2O3:Yb/Er hollow microspheres

“…3b shows that the intensity of red emissions gradually increased, whereas that of green emissions gradually diminished as the Yb 3 þ ions concentration increased. It is well known that Yb 3 þ ions can act as the sensitizer in Yb 3 þ /Er 3 þ -codoped materials, which can enhance the up-conversion emission efficiency between the donor and the acceptor ions [30][31][32]. However, it can also reduce up-conversion luminescence intensity if the concentration of Yb 3 þ is very high due to the concentration quenching induced by the energy migration between Yb 3 þ ions.…”