Photoluminescence and Raman Studies of Y<SUB>2</SUB>O<SUB>3</SUB>:Eu<SUP>3+</SUP> Nanotubes Under High Pressure

Abstract

In this work, the cubic compound Y2O3:Eu(3+) nanotubes with diameter of 70-90 nm and length of 2-3 microm are synthesized by a hydrothermal method. Photoluminescence and Raman spectra of Y2O3:Eu(3+) nanotubes in a diamond anvil cell under high pressure are measured at room temperature. The 5D0 --> 7F(0,1,2) transitions of the Eu(3+) ions exhibit red shifts to higher wavelength with pressure increasing. Above 13.4 GPa, all the Raman active modes disappear. When the pressure is released from 25.6 GPa to ambient pressure, these Raman peaks are not retrieved; this fact indicates that the nanotubes are transformed into amorphous from cubic phase at about 13.4 GPa. It may be related to the collapse of nanotube form under high pressure condition.

Study of the high pressure effect on nanoparticles GdVO4: Eu3+optical properties

“…The obtained different red shift rate in this work is not unusual for the 5 D 0 → 7 F 1,2 transition for Eu 3+ rare earth ion in a lot of materials. The different red shift for the 5 D 0 → 7 F (0, 1,2) transitions of the Eu 3+ ions was observed in other nanomaterials in size about 10-60 nm (20,21). Contrary to the nanoparticle in microcrystals in size about 200-500 nm (12), the sharp emission peaks due to the 5 D 0 → 7 F 1 transition are located at 593.7 and 594.2 nm.…”

“…For further details, please see references (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34). We obtained the pressure dependence of the energy transition W for 5 D 0 → 7 F 2 using Equation (1), given in the previous section.…”

Interpretation of europium(III) spectra

“…The study of the influence of pressure on the luminescence of europium-doped nanoparticles is a popular research topic [680][681][682][683][684][685][686]. Pressure changes have also an influence on the positions of the energy levels of the 4f 6 electronic configuration of Eu 3+ and on the position of the charge-transfer band [687][688][689][690][691][692][693][694][695][696].…”

Structural and Lattice-Dynamical Properties of Tb2O3 under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

“…13,14 The effect of HP on RE SOs has been extensively studied by several research groups and their pressure-induced PTs have been recently reviewed. 15 In fact, since the cubic phase can be synthesized in a number of them, from Lu to Sm as well as in Mn2O3, In2O3 and Tl2O3, its behavior under compression has been widely studied, as for instance in Lu2O3, 16,17 Yb2O3, 18,19 Tm2O3, 20,21 Er2O3, [22][23][24] Ho2O3, [25][26][27][28] Dy2O3, 29,30 Gd2O3, [31][32][33][34][35][36][37][38] Eu2O3 [39][40][41][42][43][44][45] Sm2O3, 34,46,47 Sc2O3, [48][49][50] Y2O3, 34,[51][52][53][54][55][56][57][58][59][60][61] Mn2O3, [62][63][64]…”