Energy transfer from Gd3+ to Eu3+ in silica xerogels

Luminescence of Eu3+/Gd3+ co-doped silicate sol–gel powders

“…Thus, the luminescence spectra of Gd 3 þ and Eu 3 þ ions were studied under excitation at 273 nm. Obviously, this observation is pointed to energy transfer process in Gd 3 þ -Eu 3 þ spectroscopic system [1,[11][12][13][14][15][16][17][18][19][20][21][22][23]25]. As mentioned above, much weaker intensity of the 8 S 7/2 -6 I J band was recorded at emission wavelength λ em ¼590 nm.…”

“…According to the authors studying the energy transfer [1,[5][6][7][8][9][10][11][12][13] we can conclude, that this process allows to obtain more efficient emission than with direct excitation of lanthanide ions dopant. This research can create more efficient red emitters based on Gd/Eu systems.…”

“…This research can create more efficient red emitters based on Gd/Eu systems. In the literature there are many publications on the preparation of co-doped Eu/Gd materials, for example: LiGdF 4, GdF 3 , NaGdF 4 , CsGd 2 F 7 , BaF 2 , BaGd 2 ZnO 5 , and K 5 Li 2 GdF 10 [8,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], but only a few papers are available on the sol-gel synthesis of powders [8,14,[18][19][20][21][22]. In recent literature there are no reports on luminescence properties of obtained materials during direct excitation of Eu 3 þ or Gd 3 þ ions and through energy migration Gd 3 þ -Eu 3 þ process.…”

Influence of silicate sol–gel host matrices and catalyst agents on the luminescent properties of Eu3+/Gd3+ under different excitation wavelengths

“…The comparison was presented and discussed in a few works, only. 5,13,[35][36][37] Excitation of Eu 3+ ions in GdF 3 :Eu 3+ aer annealing process (350-500 C) 5 Comparison of emission spectra for SG1 HT glass-ceramic material registered under different excitation wavelengths: l exc ¼ 393 nm and l exc ¼ 273 nm were presented in Fig. 8.…”

“…The lifetimes for the 5 D 0 excited state were analyzed monitoring l em ¼ 590 nm ( 5 D 0 / 7 F 1 transition of Eu 3+ ) emission, because in this spectral range the emission coming from Gd 3+ was not observed. 36 To determine the effect of qualitative composition of the matrices on emission properties, the luminescence decay curves measured under different excitation wavelengths were compared and the results are presented in Table 1. The luminescence lifetime registered for SG1 sample before annealing process is almost twice longer under UV excitation (l exc ¼ 273 nm, s 1 ¼ 0.37 ms) in comparison to 393 nm excitation (s 1 ¼ 0.19 ms).…”