Photoluminescence and photoconductivity studies on NaBi(WO4)2 single crystals: A promising Cherenkov radiator

Tyagi, Mohit; Singh, Surendra; Sen, Shashwati; Singh, Amit Kumar; Gadkari, S. C.

doi:10.1016/j.jlumin.2011.07.016

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…The thermal activation energy of NbAlO 4 is about 0.26 eV. NbAlO 4 has a higher thermal quenching ability in comparison with the reported intrinsic luminescence in transition metal oxides, such as Nb 2 WO 8 (0.187 eV), β-BiNbO 4 (0.247 eV), SbNb 3 (PO 4 ) 6 (0.185 eV), NaBi(WO 4 ) 2 (160 meV), PbWO 4 (200 meV), etc.…”

Section: Resultsmentioning

confidence: 89%

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO₄ with Wide Structure Channels

et al. 2023

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Compounds with ordered and interconnected channels have versatile multifunctional applications in technological fields. In this work, we report the intrinsic- and Eu3+-activated luminescence in NbAlO4 with a wide channel structure. NbAlO4 is an n-type semiconductor with an indirect allowed transition and a band-gap energy of 3.26 eV. The conduction band and valence band are composed of Nb 3d and O 2p states, respectively. Unlike the common niobate oxide Nb2O5, NbAlO4 exhibits efficient self-activated luminescence with good thermal stability even at room temperature. The AlO4 tetrahedron effectively blocks the transfer/dispersion of excitation energy between NbO6 chains in NbAlO4, allowing for effective self-activated luminescence from NbO6 activation centers. Moreover, Eu3+-doped NbAlO4 displayed a bright red luminescence of 5D0 → 7F2 transition at 610 nm. The site-selective excitation and luminescence of Eu3+ ions in a spectroscopic probe were utilized to investigate the doping mechanism. It is evidenced that Eu3+ is doped in the structure channel in NbAlO4 lattices, not in the normal cation sites of Nb5+ or Al3+. The experimental findings are valuable in developing new luminescent materials and improving the understanding of the material’s channel structure.

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Section: Resultsmentioning

confidence: 89%

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO₄ with Wide Structure Channels

et al. 2023

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“…The DE of b-BiNbO 4 is fitted to be 0.247 eV. This emission in b-BiNbO 4 has higher thermal quenching than some well-known scintillating crystals such as NaBi(WO 4 ) 2 (160 meV), 22 PbWO 4 (200 meV), 23 and BiPO 4 (40 meV). 13 Usually a larger Stokes shift indicates a lower quenching temperature.…”

Section: Mmct Bimentioning

confidence: 79%

Observation of intrinsic emission in β-BiNbO₄available for excitation of both UV light and high energy irradiation

Fan

Yuan

et al. 2016

Phys. Chem. Chem. Phys.

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β-BiNbO4 with a high temperature triclinic form was prepared via a high-temperature solid-state reaction ceramic method. Structural refinement and surface characteristic studies were performed. The optical absorption, and electronic calculation of the band structures and density of states were also studied. β-BiNbO4 ceramic has an indirect transition with a band energy of 3.05 eV. The valence band is dominated by O-2p states whereas the conduction band has predominantly Nb 4d and Bi 6s character. The intrinsic luminescence properties of β-BiNbO4 were reported, and present a blue emission band peak at 435 nm under the excitation of UV light. The β-BiNbO4 ceramic presents scintillation properties under high energy irradiation. The luminescence was studied via the combinations of the color centers, band calculation and energy transfer from NbO6 to Bi(3+) in the lattices. The thermal quenching and activation energy for the luminescence were reported. β-BiNbO4 has potential applications in photoluminescence and scintillation materials.

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“…NaBi(WO 4 ) 2 and NaBi(MoO 4 ) 2 are two members of this group and the device applications of these compounds are increasing in recent years. Device application studies indicated that NaBi(MoO 4 ) 2 and NaBi(WO 4 ) 2 may be used in light emitting diodes, scintillators, temperature sensors, gas sensing devices [6][7][8][9][10][11]. Both compounds crystallize in tetragonal structure with reported lattice parameters of a = b = 5.272 Å, c = 11.577 Å for NaBi(MoO4)2 and a = b = 5.265 Å, c = 11.429 Å for NaBi(WO4)2 [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Tunable nonlinear absorption and optical limiting behavior of NaBi(Mo_xW_1−xO₄)₂ single crystals with ratio of Molybdenum/Tungsten

et al. 2023

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The compositional effect of Mo/W ratio on linear, nonlinear absorption and optical limiting behavior of the NaBi(MoxW1-xO4)2 single crystals grown by Czochralski technique was investigated. X-ray diffraction patterns of the studied crystals presented well-defined peaks associated with the tetragonal crystalline structure. The nonlinear absorption performance and optical limiting threshold were determined using an open-aperture Z-scan technique. A theoretical model including one photon absorption (OPA), two photon absorption (TPA) and free carrier absorption was used to determine the nonlinear absorption parameters. All of the results showed that defect states, which strongly affect nonlinear absorption (NA) and optical limiting behaviors, can be tuned with the Mo/W ratio, enabling NaBi(MoxW1-xO4)2 single crystals to be used in desired optoelectronic applications. Linear optical absorption analysis revealed that bandgap energy and defect states can be tuned by changing the Mo/W ratio in the crystal structure. The obtained results showed that all the studied crystals had NA behavior and the nonlinear absorption coefficient decreased with increasing Mo/W ratio. Sequential TPA is the main NA mechanism for these crystals due to the fact that the incident light energy is lower than the bandgap energies and the existence of the real intermediate state around 2.32 eV.

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Photoluminescence and photoconductivity studies on NaBi(WO4)2 single crystals: A promising Cherenkov radiator

Cited by 11 publications

References 17 publications

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO₄ with Wide Structure Channels

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO₄ with Wide Structure Channels

Observation of intrinsic emission in β-BiNbO₄available for excitation of both UV light and high energy irradiation

Tunable nonlinear absorption and optical limiting behavior of NaBi(Mo_xW_1−xO₄)₂ single crystals with ratio of Molybdenum/Tungsten

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Photoluminescence and photoconductivity studies on NaBi(WO4)2 single crystals: A promising Cherenkov radiator

Cited by 11 publications

References 17 publications

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO4 with Wide Structure Channels

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO4 with Wide Structure Channels

Observation of intrinsic emission in β-BiNbO4available for excitation of both UV light and high energy irradiation

Tunable nonlinear absorption and optical limiting behavior of NaBi(MoxW1−xO4)2 single crystals with ratio of Molybdenum/Tungsten

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Product

Resources

About

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO₄ with Wide Structure Channels

Intrinsic- and Rare Earth Ion-Activated Luminescence in NbAlO₄ with Wide Structure Channels

Observation of intrinsic emission in β-BiNbO₄available for excitation of both UV light and high energy irradiation

Tunable nonlinear absorption and optical limiting behavior of NaBi(Mo_xW_1−xO₄)₂ single crystals with ratio of Molybdenum/Tungsten