Intense Green-Emission and Energy Transfer in Phosphor LiGd(PO₃)₄: Ce³⁺, Tb³⁺

Abstract

Ce3+ and Tb3+ doped LiGd(PO3)4 (LGP-CT) were synthesized with solid state reactions. The luminescence properties of Gd3+, Ce3+ and Tb3+ in LGP and energy transfer (ET) among these ions were investigated in detail. ET in Gd3+-Ce3+ and Gd3+-Tb3+ pairs is bidirectional. The luminescence lifetimes of Ce3+ and ET efficiency prove that unidirectional ET from Ce3+ to Tb3+ is very efficient. Efficient ET from Ce3+ to Tb3+ makes LGP-CT a promising green phosphor for fluorescent lamps. Optimized composition was experimentally determined to be 0.15 and 0.20 mol for Ce3+ and Tb3+, respectively. The integrated green emission intensity of LGP-Ce0.15T0.20 is 61.3% of commercial green phosphor LaPO4: Ce3+0.15, Tb3+0.20. However, synthesis temperature of the former is 500K lower than the latter. This provides LGP-CT an obvious advantage in the competition of commercial green phosphor for fluorescent lamps.

Structural, photoluminescence, and photocatalytic performances of Ce3+‐activated orthovanadate oxides M3(VO4)2 (M: Mg or Zn) synthesized by solution combustion route

“…The emission band at higher energy was ascribed to the transition 5 d → 2 F 5/2 , while that at lower energy was due to the transition 5 d → 2 F 7/2 . In the present investigation, the emission spectra are consistent with previous research on the luminescence of Ce 3+ in other hosts such as Sr 3 La 6 (SiO 4 ) 6 [37], LiAl 5 O 8 [38], Y 3 Al 5 O 12 [39], LiGd (PO 3 ) 4 [40], and NaBaPO 4 [41].…”

“…2 F 7/2 . In the present investigation, the emission spectra are consistent with previous research on the luminescence of Ce 3+ in other hosts such as Sr 3 La 6 (SiO 4 ) 6 [37], LiAl 5 O 8 [38], Y 3 Al 5 O 12 [39], LiGd (PO 3 ) 4 [40], and NaBaPO 4 [41].…”

Optical analysis of Sr3Gd(PO4)3:Pr3+ phosphors for lighting applications

“…Moreover, the phosphate‐based phosphor materials have been excellent host materials in designing WLEDs owing to their relatively high thermal stability, chemical durability and long afterglow behaviour. [ 12–15 ]…”

“…Moreover, the phosphate-based phosphor materials have been excellent host materials in designing WLEDs owing to their relatively high thermal stability, chemical durability and long afterglow behaviour. [12][13][14][15] Among the tri-valent RE ions, the praseodymium (Pr 3+ ) ion has significant applications in lighting, displays, scintillators, medical, agriculture and industrial fields due to its 4f 2 ! 4f 2 intra-configurational and 4f 1 5d 1 !…”