Luminescence properties and dynamical processes of energy transfer in BiPO4: Tb3+,Eu3+ phosphor

Luminescence and energy transfer of a color tunable phosphor: Tb3+ and Eu3+ co-doped ScPO4

“…18,19 The others from 300 to 500 nm correspond to the intra-congurational 4f 8 -4f 8 transitions from 7 F 6 levels to 5 H 6 (306 nm), 5 D 0 (323 nm), 5 G 2 (358 nm), 5 D 3 (376 nm) levels. 21 It can be expected that the excitation wavelength at 370 nm can be found from the typical commercial chips in the near future. The PL spectra of the as prepared ScPO…”

“…The phenomenon is ascribed to be the decreased distance between the sensitizer ions (Tb 3+ ) and activator ions (Eu 3+ ). 21 As is wellknown to us that the energy transfer between a sensitizer and an activator take place via two interaction mechanism: exchange interaction or electric multipolar interaction. If the critical distance between the donor ions and acceptor ions is shorter than 5 Å, the exchange interaction occurs in the host.…”

Two new rare-earth borates Sr2Tb3B27−δO46 and Ba2Eu3B27−δO46 (δ = 2/3): syntheses, crystal structures, and luminescence properties

“…[65][66][67] Moreover, the PL spectrum clearly shows strong 5 D 4 emission, and no significant 5 D 3 emission is observed due to the efficient cross-relaxation processes. 68 The scheme of the energy-levels for Tb 3+ is presented on the right side of Fig. 6(a), where it is seen that the energy gap between adjacent 5 D 3 and 5 D 4 levels is about 5762 cm −1 , which is close to that between the 7 F 6 and 7 F 0 levels (6127 cm −1 ).…”

Energy transfer mechanism and luminescence properties of color tunable LaPO4:Tm,Eu phosphor

“…which is based on the theories of Förster and Dexter and derived by Inokuti and Hirayama using an energy diffusion model [27][28][29]. 0 I is the initial emission intensity after pulse excitation; i τ is the intrinsic decay time of the Tm 3+ donors in the absence of Eu 3+ acceptors; A C is the Eu 3+ concentration per unit volume, and 0 C is the critical concentration; Γ is the gamma function; S is the multipolar interaction parameter and describes the type of multipolar mechanism: S is 6 for dipole-dipole, 8 for dipole-quadrupole, and 10 for quadrupole-quadrupole interactions.…”