Effect of structure, particle size and relative concentration of Eu³⁺and Tb³⁺ions on the luminescence properties of Eu³⁺co-doped Y₂O₃:Tb nanoparticles

Abstract

Eu(3+) co-doped Y(2)O(3):Tb nanoparticles were prepared by the combustion method and characterized for their structural and luminescence properties as a function of annealing temperatures and relative concentration of Eu(3+) and Tb(3+) ions. For Y(2)O(3):Eu,Tb nanoparticles annealed at 600 and 1200 °C, variation in the relative intensity of excitation transitions between the (7)F(6) ground state and low spin and high spin 4f(7)5d(1) excited states of Tb(3+) is explained due to the combined effect of distortion around Y(3+)/Tb(3+) in YO(6)/TbO(6) polyhedra and the size of the nanoparticles. Increase in relative intensity of the 285 nm peak (spin-allowed transition denoted as peak B) with respect to the 310 nm peak (spin-forbidden transition denoted as peak A) with decrease of Tb(3+) concentration in the Y(2)O(3):Eu,Tb nanoparticles heated at 1200 °C is explained based on two competing effects, namely energy transfer from Tb(3+) to Eu(3+) ions and quenching among the Tb(3+) ions. Back energy transfer from Tb(3+) to Eu(3+) in these nanoparticles is found to be very poor.

Hydrothermal synthesis and photoluminescence of Ce3+ and Tb3+ doped La2Sn2O7 nanocrystals

“…Terbium ions are the most important green-emitting luminescent activators for several phosphors [11][12][13] because it has a sharp emission around 544 nm with high intensity, which is close to the theoretical optimum wavelength for the green component of three primary color centers. Ce 3+ is also a widely used luminescence activator in optical materials and its properties are well known.…”

Folate receptor targeted, rare-earth oxide nanocrystals for bi-modal fluorescence and magnetic imaging of cancer cells

“…3. Bare NCs showed characteristic Y-O bond vibrations of YO 6 polyhedra at w562 cm À1 [42]. Probably owing to the very low concentration of dopant ions in the lattice (max w2 mol%), the vibrational features related to Eu-O and Gd-O was not registered.…”

The optical properties of Eu3+ and Tm3+ codoped Y2O3 submicron particles

“…The direct excitation of Tm-O charge transfer band at 320 nm give rise to 1 G 4 → 3 H 6 and 1 D 2 → 3 F 4 transitions within the Tm ions with feeble energy transfer from Tm to Eu ions. Therefore, it can be concluded that the energy transfer between the codoped Tm 3+ and Eu 3+ is not sufficient in contrast to previously reported Tb 3+ → Eu 3+ energy transfer in Y 2 O 3 [9,15]. for example in solid state illumination, security-printing area, and other related areas.…”