Luminescent properties and energy transfer of Gd3+/Eu3+ co-doped high uniform meso-silica nanorods

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.…”

Luminescent properties and energy transfer of Gd3+/Eu3+ co-doped cubic CaCO3

“…The main emission peak appeared at about 311nm, which corresponds to the 6 P 7/2 → 8 S 7/2 transition of Gd 3+ . The PL intensity increases with increasing of Gd 3+ ions concentration and the intensity reaches the maximum when the concentration of Gd 3+ ions is 2.0 mol%, then the intensity decreases with concentration increasing of Gd 3+ ions, which is regarded as the typical concentration quenching effect [31]. This type of luminescence behavior may be due to the interaction between Gd 3+ ions.…”

“…The curve can be fitted well into a double-exponential function. The average fluorescence lifetime was defined as the following formula: 22 gradually decrease with the increasing of Eu 3+ concentration, demonstrating that it is possible to exist the energy transfer from Gd 3+ to Eu 3+ although this effect may be caused by much more defects [31][32][33][34].…”