Luminescence properties and energy transfer studies in thermally stable Bi2O3: Sm3+, Eu3+ phosphor

Judd–Ofelt Intensity Parameters and Optical Properties of Eu/Li Co‐Doped CeO2 Phosphor

“…where y and y 0 represent the emission intensity at time t and initial, respectively; A 1 and A 2 are constants; τ 1 represents the lifetime of Eu 3 + occupying sites on the surface particle or near defect sites; τ 2 is attributed to Eu 3 + sites replaced for Ce 4 + ions in the host lattice. [51] The average lifetimes (τ) can be described as follows [52] :…”

High-efficiency energy transfer in the strong orange-red-emitting phosphor CeO2:Sm3+, Eu3+

“…Sm 3+ is a popular sensitizer for improving the efficiency emission of Eu 3+ ion due to the small energy difference between the 4 G 5/2 level of Sm 3+ and the 5 D 0 level of Eu 3+ (about 600 cm −1 ), leading to easy phonon-assisted energy transfer (ET). 13 Hence, the energy transfer between Sm 3+ and Eu 3+ ions was widely investigated in a variety of host lattices. 12,16,17 J. Wu et al 16 found that the ET efficiency from Sm 3+ to Eu 3+ up to 65% in YPO 4 :Sm 3+ , Eu 3+ phosphor corresponds to the electric dipole-electric dipole interaction mechanism.…”

“…Clearly, the addition of two or more RE ions into a luminescent material can effectively control multi-color luminescence and achieve ET, thereby improving the luminous efficiency of the phosphors. 7,11,13,18 Besides, several parameters, including the degree of crystallinity, the dopant concentration, and the host material, inuence the emission efficiency of the phosphors. In this case, the host lattice selection is important since it inuences the luminescent efficiency and the application potential of the material.…”

“…Notably, Eu 3+doped phosphors typically exhibit relatively narrow absorption in UV and near-UV regions because of the spin-forbidden transition of Eu 3+ , resulting in low emission efficiency. 11,12 This defect can be compensated by introducing sensitizing ions, such as Tb 3+ , Bi 3+ , Gd 3+ , and Sm 3+ , [13][14][15] which can absorb excitation energy efficiently and transfer it to Eu 3+ . Sm 3+ is a popular sensitizer for improving the efficiency emission of Eu 3+ ion due to the small energy difference between the 4 G 5/2 level of Sm 3+ and the 5 D 0 level of Eu 3+ (about 600 cm −1 ), leading to easy phonon-assisted energy transfer (ET).…”