Electronic structure and properties of RbTiOPO<sub>4</sub>:Ta crystals

Li, Ziqing; Chen, Yang; Zhu, Pengfei; Ji, Nianjing; Duan, Xiulan; Jiang, Huaidong

doi:10.1039/c7ra10310g

Cited by 10 publications

(10 citation statements)

References 35 publications

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“…As we can see in the table, the binding energy of Ta 4f 7/2 level is 26.4–26.5 eV, which is 0.2–0.3 eV higher than that in RTP:Ta crystal. The spin–orbit doublet separation is 1.9 eV, which is consistent with the data in RTP:Ta crystal . Finally, the relative atomic concentrations for Ta and Ti were estimated from high-resolution XPS data, as shown in Table .…”

Section: Resultssupporting

confidence: 80%

“…The spin−orbit doublet separation is 1.9 eV, which is consistent with the data in RTP:Ta crystal. 33 Finally, the relative atomic concentrations for Ta and Ti were estimated from high-resolution XPS data, as shown in Table 5. The result shows that relative atomic concentration of Ta actually improves with the increasing doping concentration.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous work shows that RTP:Ta crystal has good nonlinear optical properties and a wide light transmission range, , which is suitable as a crystal matrix to host Yb 3+ . Therefore, we have carried out research on Ta and Yb double-doped RTP crystal and then explored its potential value as self-frequency doubling laser.…”

Section: Introductionmentioning

confidence: 99%

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Increased Concentration of Yb³⁺ and High Crystal Field Strength in RbTiOPO₄:Ta Single Crystal with Optimized Growth

Zhu

Ding

et al. 2019

Crystal Growth & Design

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Yb-doped inorganic crystals have attracted great attention in both basic and applied research, and the quest for suitable crystal hosts and understanding the corresponding crystal field environments are still worth studying in laser application. In this context, inclusion-free RbTiOPO 4 :Ta:Yb (RTP:Ta:Yb) single crystals with dimensions up to 3 × 30 × 15 mm 3 were grown by top-seeded solution growth method under optimized growth conditions. The good crystalline quality of the as-grown RTP:Ta:Yb crystals were confirmed by X-ray diffraction rocking curve. The chemical compositions of the crystals were determined through electron probe microanalysis (EPMA). The results showed that the Ta distribution coefficient is 0.90−1.28, and the Yb distribution coefficient is 0.13−0.37. Double doping of Ta 5+ ions can effectively increase the concentration of Yb 3+ ions in the RTP crystal, and the concentration of Yb 3+ ion in RTP crystal can reach 1.26 × 10 20 atom/cm 3 . The influence of Ta and Yb dopants on the electronic structures of RTP crystals was studied using high-resolution X-ray photoelectron spectroscopy (XPS), and the chemical strengths of Ti−O and P−O bonds are related to the binding energy difference. RTP:Ta:Yb crystals exhibit excellent transparent performance in the wavelength range of 0.35− 4.5 μm, and the transmittance is about 83%. Photoluminescence spectra show five emission peaks of Yb 3+ in crystals, and the main emission peak is located at 972 nm. Two different coordination sites for Yb 3+ were observed, and their energy levels were determined in the crystal field of the RTP:Ta structure. Furthermore, the crystal field strengths of Yb 3+ in different host crystals associated with their distorted coordination environments were evaluated and discussed in detail. The results demonstrate that the RTP:Ta:Yb single crystal endowed with high crystal field strength and good luminescence property is suitable for laser application.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

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Increased Concentration of Yb³⁺ and High Crystal Field Strength in RbTiOPO₄:Ta Single Crystal with Optimized Growth

Zhu

Ding

et al. 2019

Crystal Growth & Design

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“…Table 2 illustrates the chemical composition of Co-NiO films. It was found that the decrease in an atomic concentration (at%) of Ni 2p is affected by the increase in the content of Co, which is generally found in the report related to dopant 37 . To support the results of the chemical composition in Co-NiO films evaluated by XPS, the EDS was conducted.…”

Section: Resultssupporting

confidence: 61%

Influence of Co concentration on properties of NiO film by sparking under uniform magnetic field

Tippo

Thongsuwan

Wiranwetchayan

et al. 2020

Sci Rep

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Nickel oxide (NiO) films cover numerous electronic applications, including transparent conducting oxides and hole transport layer, because of its high transparency and wide band gap. A sparking discharge is a new and unique method for the deposition of NiO films due to non-complex operation and non-requirement of a vacuum atmosphere. Unfortunately, NiO films by the sparking method display a porous surface with inferior crystallinity. By assisting a uniform magnetic field in the sparking method, the porous and the crystallinity of NiO are improved. However, electrical properties of the NiO films deposited by this strategy are poor. In order to improve the electrical properties of NiO, a substitutional of Ni ions by Co ions is considered. In this study, we report an influence of Co concentration on properties of NiO films by sparking under a uniform magnetic field. Our results indicate that an increase in Co concentration to 0.1 M improves the crystallinity and increases a carrier concentration of NiO, resulting in a reduction of the resistivity. This consequence is in agreement with the increase in a number of higher-valence Ni3+ because of the Co2+ substituted Ni2+. Based on our research, Co-NiO film is promising materials for a transparent conductor.

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“…The explanation could be that the electronegativity difference between Ta and Nb leads to a change of the valence electron density, which influences the ejection of electrons from Nb 5+ ions and thus results in the peak shift. [ 32 ] The high resolution spectra of Ta 4f (Figure 3c) reveal the existence of Ta 5+ in the Ca 2 Nb 3− x Ta x O 10 ( x = 0.5, 1, 1.5) nanosheets, with the Ta 4f 7/2 peak centered on 27.4 eV and Ta 4f 5/2 located at 25.4 eV. And the surface element ratios are shown in Table S2, Supporting Information, which are also coincident with the target ratio.…”

Section: Resultsmentioning

confidence: 99%

Boosted Responsivity and Tunable Spectral Response in B‐Site Substituted 2D Ca₂Nb₃₋_xTa_xO₁₀ Perovskite Photodetectors

Liu

et al. 2021

Adv Funct Materials

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2D Dion‐Jacobson perovskite oxides, featuring fascinating optical and electric properties, exhibit great potential in optoelectronic devices. However, the device sensitivity and spectral selectivity are limited. Herein, B‐site substituted calcium niobate Ca2Nb3−xTaxO10 (x = 0, 0.5, 1, 1.5) nanosheets are prepared by liquid exfoliation. The photodetectors (PDs) based on these nanosheets exhibit tunable spectral response by tailoring the band gap of the nanosheets. All the Ta‐substituted PDs show increased photocurrent and enhanced responsivity, among which the Ca2Nb2.5Ta0.5O10 PD exhibits the optimal performance with a photocurrent of 31.4 µA, a high on–off ratio of 5.6 × 104 and a boosted responsivity of 469.5 A W−1 at 1.0 V toward 295 nm, which is over 7000‐fold higher than that of pristine Ca2Nb3O10 PD. It is proposed that the significantly optimized responsivity is ascribed to the enhanced photoconductive gain that mainly originates from the introduction of the trap states by the B‐site substitution. Nevertheless, excess substitution is detrimental to the responsivity and the response speed. This work demonstrates that the rational control of B‐site substitution tailors the band gap and modulates the charge‐carrier behaviors in 2D perovskite oxides, which provides an effective avenue for achieving high‐performance PDs with tunable spectral response and excellent responsivity.

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Electronic structure and properties of RbTiOPO₄:Ta crystals

Cited by 10 publications

References 35 publications

Increased Concentration of Yb³⁺ and High Crystal Field Strength in RbTiOPO₄:Ta Single Crystal with Optimized Growth

Increased Concentration of Yb³⁺ and High Crystal Field Strength in RbTiOPO₄:Ta Single Crystal with Optimized Growth

Influence of Co concentration on properties of NiO film by sparking under uniform magnetic field

Boosted Responsivity and Tunable Spectral Response in B‐Site Substituted 2D Ca₂Nb₃₋_xTa_xO₁₀ Perovskite Photodetectors

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Electronic structure and properties of RbTiOPO4:Ta crystals

Cited by 10 publications

References 35 publications

Increased Concentration of Yb3+ and High Crystal Field Strength in RbTiOPO4:Ta Single Crystal with Optimized Growth

Increased Concentration of Yb3+ and High Crystal Field Strength in RbTiOPO4:Ta Single Crystal with Optimized Growth

Influence of Co concentration on properties of NiO film by sparking under uniform magnetic field

Boosted Responsivity and Tunable Spectral Response in B‐Site Substituted 2D Ca2Nb3−xTaxO10 Perovskite Photodetectors

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Product

Resources

About

Electronic structure and properties of RbTiOPO₄:Ta crystals

Increased Concentration of Yb³⁺ and High Crystal Field Strength in RbTiOPO₄:Ta Single Crystal with Optimized Growth

Increased Concentration of Yb³⁺ and High Crystal Field Strength in RbTiOPO₄:Ta Single Crystal with Optimized Growth

Boosted Responsivity and Tunable Spectral Response in B‐Site Substituted 2D Ca₂Nb₃₋_xTa_xO₁₀ Perovskite Photodetectors