Non-resonant energy transfer from Eu3+ to Yb3+ in C-type and B-type (Eu1-Yb )2O3 nanocrystals

Raman spectroscopic study of anhydrous and hydrous REE phosphates, oxides, and hydroxides

“…The monoclinic B-type structure has been observed for Sc 2 O 3 at high pressures, 26 for Eu 2 O 2 , 62 Gd 2 O 3 25 and Sm 2 O 3 at ambient conditions. Theoretical predictions indicate 21 Raman active modes using group theory, i.e.…”

“…Theoretical predictions indicate 21 Raman active modes using group theory, i.e. 14A g + 7B g , 27 of which 16 are typically measured. 24–26,32,62,63 The Raman spectra for B-type oxides is more complicated compared to A-type oxides, which only have one major peak.…”

“…14A g + 7B g , 27 of which 16 are typically measured. 24–26,32,62,63 The Raman spectra for B-type oxides is more complicated compared to A-type oxides, which only have one major peak. In B-type oxides, there are several overlapping peaks with peak heights varying considerably between the 266 and 532 nm excitation lasers due to different Raman mode activation.…”

“…Laser induced photoluminescence is common in REE-bearing solids 9,17,18,27,[82][83][84][85] and occurs due to the 4f electron configurations of REE 3+ ions, which may result in narrow band widths similar to typical Raman modes. 13,83,86 Here prominent fluorescence was observed in Nd, Sm, Eu, Gd, Er and Ho solids when using the 532 nm excitation laser (Fig.…”

“…In the A-type hexagonal structure La, Pr and Nd oxides were previously measured [19][20][21][22][23] and in the B-type monoclinic structure Nd, Eu, Gd and Sc oxides have been studied. [24][25][26][27] In the C-type cubic structure, Pr, Nd, Sm, Eu, Gd, Tb-Lu, Y and Sc endmembers as well as Dy-Tm, Dy-Y and Ho-Y solid solutions were previously studied. 9,24,25,[28][29][30][31][32][33][34][35][36][37] Hydroxides have been less studied with a few key studies summarizing La, Pr and Nd hydroxides, 38 Nd hydroxide 39 and Nd-Gd, Tb and Dy hydroxides.…”