Fast excited-state relaxation of Eu-Eu pairs in commercial Y2O3: Eu3+ phosphors

Cathodoluminescence of Nanocrystalline Y2O3:Eu3+with Various Eu3+Concentrations

“…[4][5][6][7][8] As mentioned before, the 5 D 0 → 7 F 1 (S 6 ) transition at 582 nm and the 5 D 0 → 7 F 2 (C 2 ) transition at 611 nm were selected for this study. The first step is determining the ratio between these two transitions: R 611 /R 582 .…”

“…[13][14][15][16][17][18][19] In the earlier studies [4][5][6][7][8][9][10][11][12] the focus was on the interpretation of the excitation and emission spectra in terms of energy transfer in the Y 2 O 3 :Eu 3+ crystals, whereas in the latter studies [13][14][15][16][17][18][19] the attention shifted toward the synthesis of nanomaterials. Most studies used photoluminescence (PL) techniques, [4][5][6][7] which enabled the excitation of energy levels having a particular symmetry and yielded insight on the energy flow in Y 2 were limited to the evaluation of the luminous efficiency. [10][11][12] A detailed investigation of the energy flow in Y 2 O 3 :Eu 3+ after excitation by an electron beam was performed by Klaassen et al 8 These authors also studied saturation effects in Y 2 O 3 :Eu 3+ at high current densities in an electron microscope.…”

“…In 6 and allow luminescence decay measurements that are not perturbed by a large overlap of nearby transitions. Another important condition for this selection was the radiance of the 5 D 0 → 7 F 1 (S 6 ) transition at 582 nm, which was sufficient to perform decay measurements at room temperature.…”

“…This selection is not trivial, because many peaks in the spectrum of Y 2 O 3 :Eu 3+ suffer from overlap or are combinations of more than one spectral transition. 5,6 The first phase in the energy flow in Y 2 4,20 In Y 2 O 3 there are two different Y 3+ lattice sites, which possess the point symmetries C 2 and S 6 (Schoenflies notation): 24 lattice sites have C 2 symmetry, while the other 8 have S 6 symmetry. Both sites are six coordinate and are thus present in the ratio of 3:1.…”

“…Before 1996 these studies were focused mainly on micrometer sized particles, [4][5][6][7][8][9][10][11][12] more recently the attention has been directed to nano-sized powder materials. [13][14][15][16][17][18][19] In the earlier studies [4][5][6][7][8][9][10][11][12] the focus was on the interpretation of the excitation and emission spectra in terms of energy transfer in the Y 2 O 3 :Eu 3+ crystals, whereas in the latter studies [13][14][15][16][17][18][19] the attention shifted toward the synthesis of nanomaterials. Most studies used photoluminescence (PL) techniques, [4][5][6][7] which enabled the excitation of energy levels having a particular symmetry and yielded insight on the energy flow in Y 2 were limited to the evaluation of the luminous efficiency.…”