Rare-earth ion distribution in sol–gel glasses co-doped with Al3+

Defect Luminescence of Yag Nanopowders and Crystals Undoped and rare-earth-ion-doped Y3Al5O12 (YAG) nanopowders are prepared by the sol-gel low-temperature combustion method. The luminescence characteristics of the YAG, YAG: Ce, YAG:Pr, and YAG: Ce/Pr nanopowders are compared with those of the single crystals. The luminescence band peaking around 3.1 eV is complex and excited at about 3.6 eV, 3.9 eV and 4.3 eV. The 3.1 eV emission was peculiar to all the samples studied. The Stokes shift of this band is ~0.5 eV. The decay time of the ~3.1 eV emission at 80 K is ~14 ns and the slower decay (afterglow) components are practically absent. The 3.1 eV luminescence was suggested to arise from different intrinsic lattice defects.

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Local symmetry and Z-scan analysis of ZnSe/Eu3+ doped sol–gel silica hosts

Canadian Journal of Physics ◽

10.1139/p10-030 ◽

2010 ◽

Vol 88 (7) ◽

pp. 493-500 ◽

Cited By ~ 1

Author(s):

Siby Mathew ◽

K. V. Arun Kumar ◽

C. Sudarsanakumar ◽

V. P.N. Nampoori ◽

N. V. Unnikrishnan

Keyword(s):

Rare Earth ◽

Sol Gel ◽

Glass Network ◽

Local Symmetry ◽

Wide Distribution ◽

Rare Earth Ions ◽

Saturable Absorption ◽

Rare Earth Ion ◽

Enhanced Absorption ◽

The Rare Earth

Vibrational state side-band spectral analysis of silica matrices, doped with ZnSe/Eu3+ ions, associated with the excitation transition 7F0→5D2 is used to analyze the local asymmetry of the rare earth ions in the glass host. The large inhomogeneous linewidth for the ZnSe co-doped samples indicates the wide distribution of the Eu3+ ions in the matrix and is related to the flexibility of the local glass network. The fluorescence spectra reveal that the intensity of the characteristic emission of europium increases considerably in the presence of ZnSe particles. This phenomenon can be explained by the energy transfer resulting from electron–hole recombination in the ZnSe to the rare earth ion. Nonlinear optical absorption of the sample is also investigated at a wavelength of 532 nm, using open aperture Z-scan technique. The sample exhibits reversible saturable absorption (RSA), which is found to depend on excitation fluence. RSA is due to the enhanced absorption resulting from the electron dynamics in nano-crystallites.

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Reusable Thermal History Sensing via Oxidation of a Divalent Rare Earth Ion-Based Phosphor Synthesized by the Sol–Gel Process

Heat Transfer Engineering ◽

10.1080/01457632.2015.994998 ◽

2014 ◽

Vol 36 (14-15) ◽

pp. 1275-1281 ◽

Cited By ~ 5

Author(s):

Álvaro Yáñez González ◽

Stephen Skinner ◽

Frank Beyrau ◽

Andrew L. Heyes

Keyword(s):

Rare Earth ◽

Thermal History ◽

Sol Gel ◽

Rare Earth Ion ◽

Sol Gel Process

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Photo-properties of rare earth ion (Er3+, Eu3+ and Sm3+)-doped alumina films prepared by the sol–gel method

Chemical Physics Letters ◽

10.1016/s0009-2614(98)00132-8 ◽

1998 ◽

Vol 287 (5-6) ◽

pp. 737-741 ◽

Cited By ~ 37

Author(s):

Youichi Kurokawa ◽

Takayuki Ishizaka ◽

Tadaaki Ikoma ◽

Shozo Tero-Kubota

Keyword(s):

Rare Earth ◽

Sol Gel ◽

Rare Earth Ion ◽

Gel Method ◽

Sol Gel Method ◽

Alumina Films

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Structural, magnetic and electrical properties of RFeO3 (R= Dy, Ho, Yb & Lu) compounds

10.21203/rs.3.rs-161781/v1 ◽

2021 ◽

Author(s):

Mehrnoush Nakhaei ◽

Davoud Sanavi Khoshnoud

Keyword(s):

Dielectric Constant ◽

Rare Earth ◽

Electrical Properties ◽

Sol Gel ◽

Magnetic Hysteresis ◽

Combustion Method ◽

Rare Earth Ion ◽

Gel Combustion ◽

Diffraction Patterns ◽

Magnetic And Electrical Properties

Abstract The nanosized rare earth orthoferrites (RFeO3) with R= Dy, Ho, Yb & Lu were synthesis by sol-gel combustion method. The effects of varying rare earth ion on structural, magnetic and electrical properties of RFeO3 nanoparticles (NPs) have been studied. X-ray diffraction patterns of the prepared samples were in single phase with orthorhombic structure with space group Pbnm. The magnetic hysteresis measurements indicated the decrease in the antiferromagnetic nature of RFeO3 from Dy to Lu that can be ascribed to increasing noncollinear Fe moments because of the structural distortion. The electric hysteresis of these samples exhibited narrow electric field-polarization loops. The frequency response of dielectric constant of RFeO3 explained based on dipole relaxation process and Maxwell-Wagner model. In addition, the temperature dependence of dielectric constant illustrated an anomaly in the vicinity of the Neel temperature of RFeO3 compounds. This occurrence indicate that a coupling exist between magnetic and electric orders.

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