Interionic Energy Transfer in Y₃Al₅O₁₂: Ce³⁺, Pr³⁺, Cr³⁺Phosphor

Abstract

We present an investigation of dynamical processes of nonradiative energy transfer (ET) in Y 3 Al 5 O 12 :Ce 3+ , Pr 3+ , Cr 3+ phosphor. The analysis based on Inokuti-Hirayama model indicates that the ET from the lowest 5d state of Ce 3+ to the 4 T 2g state of Cr 3+ , and from the state 1 D 2 of Pr 3+ to 4 T 2g state of Cr 3+ are both governed by electric dipole-dipole interaction. For Pr 3+ concentration of 0.005 in YAG: Pr 3+ Cr 3+ and for Ce 3+ concentration of 0.01 in YAG: Ce 3+ Cr 3+ the rate constant and critical distance are evaluated to be 7.3×10 −37 cm 6 s −1 and 0.22 nm for Pr 3+ -Cr 3+ ET and 1.03×10 −36 cm 6 s −1 and 0.63 nm for Ce 3+ -Cr 3+ ET, respectively.

Ce3+/Pr3+: YAGG: A Long Persistent Phosphor Activated by Blue‐Light

“…(a)] and PLE spectrum of Pr 3+ [Fig. (b)], which would enable an efficient energy transfer from Ce 3+ to Pr 3+ according to the Förster's model . For the Ce 3+ , Pr 3+ codoped sample [Fig.…”

“…4 (b)], which would enable an efficient energy transfer from Ce 3+ to Pr 3+ according to the F€ orster's model. [30][31][32] For the Ce 3+ , Pr 3+ codoped sample [ Fig. 4 (c)], Pr 3+ : 1 D 2 ?…”

The Investigations of the Pr, Gd, Si–N Doping, and Phosphor Curvature Effects on the Performances of YAG‐Based WLEDs

“…Wang et al. reported that the emission intensity at 610 and 640 nm of YAG:Ce phosphors could be enhanced by adding Pr 3+ as the codopant, whereas the Ce 3+ emission intensity was decreased because of the transfer of energy from Ce 3+ to Pr 3+ …”

“…Wang et al reported that the emission intensity at 610 and 640 nm of YAG:Ce phosphors could be enhanced by adding Pr 3+ as the codopant, whereas the Ce 3+ emission intensity was decreased because of the transfer of energy from Ce 3+ to Pr 3+ . [1][2][3] The red components of YAG:Ce can also be enhanced by increasing the crystal field strength of Ce 3+ . It is known that the d-orbital splitting of Ce 3+ caused by the crystal field strength is inversely proportional to the Ce-ligand bond length to its fifth power, and therefore the red-shift of the emission band of YAG:Ce may occur with a reduction in the bond length between Ce and ligand ion.…”

Infrared and visible scintillation of Ho3+-doped YAG and YLF crystals

“…Actually, Cr 3+ ion is an efficient electron trap [27]. As the charge transfer O 2− →Cr 3+ band lies at 230 nm [28], just above the self trapped exciton emission, it is therefore reasonable that ionization can occur more likely for Cr 3+ in a excited state than in ground state. As the current injection increases, more Cr 3+ ions are excited from the ground state 4 A 2 into the metastable manifold 2 E. The host excitons more likely give up their energy in the O 2− →Cr 3+ charge transfer rather than in the direct excitation Ho 3+ ions or in the radiative decay.…”