Raman scattering study on formation of ErNbO4 powder

Zhang, De‐Long; Wang, Dun-Chun; Pun, Edwin Yue-Bun

doi:10.1002/pssa.200406839

Cited by 8 publications

(10 citation statements)

References 32 publications

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“…A simple formation mechanism of ErNbO 4 , elevated-temperatureassisted solid-state chemical reaction equation: Er 2 O 3 +Nb 2 O 5 2ErNbO 4 , was suggested. The formation of the powder phase has been investigated by X-ray diffraction spectroscopy [6] and Raman spectroscopy [7]. In this paper, visible and near infrared absorption and emission characteristics of these powder samples were demonstrated in comparison with the spectra of the raw material Er 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Absorption and emission of ErNbO4 powder

Zhang¹,

Pun²,

Yu³

et al. 2004

Optical Materials

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Section: Introductionmentioning

confidence: 99%

Absorption and emission of ErNbO4 powder

Zhang¹,

Pun²,

Yu³

et al. 2004

Optical Materials

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“…It is worth noting that the modes below 180 cm −1 could not be identified here, likely due to the filter used to remove the contribution of the Rayleigh scattering during the collection of the Raman signal. Nevertheless, 4 additional small peaks that were not reported by those authors (or others [ 7 , 19 , 21 ]) are also present in the displayed spectra, specifically at 501, 520, 547, and 777 cm −1 . The origin of these peaks is not yet clear.…”

Section: Resultsmentioning

confidence: 61%

“…Indeed, these materials exhibit low phonon cut-off energies, which make them suitable for optical applications, as the transition probability of the intra-4f n is enhanced in such case, also presenting long emission lifetimes [2,5]. Several RE ions have been employed in the formation of RE niobate materials (RE = La, Ce, Pr, Nd, Sm, Eu, Dy, Ho, and Er) [1,3,[6][7][8][9][10] and their luminescence properties have been widely investigated. Among those, erbium niobates possess interesting properties for optical applications owing to the trivalent Er ion (Er 3+ ) characteristics [11,12].…”

Section: Introductionmentioning

confidence: 99%

Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles

et al. 2021

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Tetragonal Er0.5Nb0.5O2 and monoclinic ErNbO4 micro- and nanoparticles were prepared by the citrate sol–gel method and heat-treated at temperatures between 700 and 1600 °C. ErNbO4 revealed a spherical-shaped crystallite, whose size increased with heat treatment temperatures. To assess their optical properties at room temperature (RT), a thorough spectroscopic study was conducted. RT photoluminescence (PL) spectroscopy revealed that Er3+ optical activation was achieved in all samples. The photoluminescence spectra show the green/yellow 2H11/2, 4S3/2→4I15/2 and red 4F9/2→4I15/2 intraionic transitions as the main visible recombination, with the number of the crystal field splitting Er3+ multiplets reflecting the ion site symmetry in the crystalline phases. PL excitation allows the identification of Er3+ high-energy excited multiplets as the preferential population paths of the emitting levels. Independently of the crystalline structure, the intensity ratio between the green/yellow and red intraionic transitions was found to be strongly sensitive to the excitation energy. After pumping the samples with a resonant excitation into the 4G11/2 excited multiplet, a green/yellow transition stronger than the red one was observed, whereas the reverse occurred for higher excitation photon energies. Thus, a controllable selective excited tunable green to red color was achieved, which endows new opportunities for photonic and optoelectronic applications.

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“…On the other hand, a certain number of Er 3+ ions did not diffuse into the bulk and residue within the 0.6 m shallow layer near the crystal surface. 14 The scattering intensity shown in Fig. Further x-ray diffraction studies show that these residual Er 3+ ions are present as the grains dominated by the ErNbO 4 crystalline phase.…”

Section: Resultsmentioning

confidence: 92%

“…2 show the measured Er-concentration profiles. 13,14 There is an argument to be clarified here. On the other hand, a certain number of Er 3+ ions did not diffuse into the bulk and residue within the 0.6 m shallow layer near the crystal surface.…”

Section: Resultsmentioning

confidence: 99%

Er 3 + diffusion in congruent LiNbO3 crystal in Li-enriched atmosphere

Zhang

Jia

Hua

et al. 2007

Journal of Applied Physics

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Er 3 + diffusion in congruent LiNbO 3 crystal doped with 4.5 mol% MgOJudd-Ofelt analysis of spectroscopic property of Er 3 + in congruent and near-stoichiometric Zn ∕ Er -codoped Li Nb O 3 crystalsThe thermal diffusion of Er 3+ into X-and Z-cut congruent LiNbO 3 crystal in Li-enriched atmosphere ͓i.e., vapor transport equilibration ͑VTE͔͒, created by Li 3 NbO 4 -LiNbO 3 two-phase powder at the temperature around 1130°C, was attempted. Single-crystal x-ray diffraction, micro-Raman, photoluminescence spectroscopy, and secondary ion mass spectrometry ͑SIMS͒ were used to study the crystalline phase with respect to Er 3+ ion and the Er 3+ diffusivity. The results show that the thickness of the Er film coated should not be thicker than 10 nm for an X-cut plate and 15 nm for a Z-cut plate. In this case, the diffusion is complete if the duration is long enough ͑Ͼ150 h͒ and the Er 3+ ions in the diffused layer still retain the LiNbO 3 phase. On the other hand, if the initial thickness of the Er metal film is thicker than 10 nm for the X-cut plate and 15 nm for the Z-cut plate, the diffusion will be incomplete no matter how long the duration is. This is because the residual Er 3+ ions form irremovable ErNbO 4 grains on the surface of the crystal. SIMS analysis on an X-cut VTE ͑1130°C / 192 h͒ and a Z-cut VTE ͑1129°C / 158 h͒ crystal coated, respectively, with 10 and 15 nm thick Er film reveals that the Er diffusion shows obvious anisotropy with the mean diffusion coefficients of 0.0155 and 0.0957 m 2 / h, respectively. The surface concentrations are 1.5ϫ 10 20 and 1.0ϫ 10 20 at./ cm 3 , respectively. The diffused Er 3+ ions follow the stretched-exponential decay profile with a stretching factor of 1.85 and 3.5, respectively. The Li/ Nb ratio in the Er-diffused layer is similar to 99.4% for the X-cut sample coated with 10 nm thick Er film and 99.3% for the Z-cut crystal coated with 15 nm thick Er film. The rms roughness of the diffused surface is better than 6 and 4 nm for the X-cut and Z-cut samples, respectively.

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Raman scattering study on formation of ErNbO4 powder

Cited by 8 publications

References 32 publications

Absorption and emission of ErNbO4 powder

Absorption and emission of ErNbO4 powder

Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles

Er 3 + diffusion in congruent LiNbO3 crystal in Li-enriched atmosphere

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