Novel self -activated Na2BiMgZnV3O12 Yellow-Green phosphor for N-UV excited WLEDs

Amrithakrishnan, B; Rakhi, M.; Jawahar, I. N.; Subodh, G.

doi:10.1063/5.0016725

Dae Solid State Physics Symposium 2019 2020

DOI: 10.1063/5.0016725

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Novel self -activated Na2BiMgZnV3O12 Yellow-Green phosphor for N-UV excited WLEDs

B Amrithakrishnan¹,

M. Rakhi²,

I. N. Jawahar³

et al.

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Cited by 5 publications

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Vibrationally Induced Photophysical Response of Sr₂NaMg₂V₃O₁₂:Eu³⁺ for Dual‐Mode Temperature Sensing and Safety Signs

Bindhu

Naseemabeevi

Subodh

2021

Advanced Photonics Research

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In the dual‐emitting Eu3+‐activated Sr2NaMg2V3O12 garnet, vibrationally induced thermometric response and thermochromic luminescence are investigated for the first time. Based on the diverse thermal quenching of VO43− and Eu3+ along with the advantage of variation in the fluorescence intensity ratio, a potential phosphor for sensitive dual‐mode ratiometric and colorimetric temperature sensors is proposed in which maximum absolute and relative sensitivity of 0.0135 K−1 and 1.61% K−1 are obtained at 420 K with a temperature resolution <0.2 K. Efficient thermochromic luminescence in which colorific shift from white (300 K) to red (500 K) is observed such that the requirement of larger number of phonons weakens the nonradiative relaxation of Eu3+, resulting in slow quenching, substantiated by estimating radiative and nonradiative decay rates by the 4f–4f intensity method. In contrast, a strong vibrational coupling of excited electrons of the VO43− complex is identified and verified by means of temperature‐dependent Raman and photoluminescence excitation spectra for the first time. Consequently, an increased thermal population of vibrational levels favors rapid thermal quenching of luminescence of VO43− via crossover mechanism. Hence dual‐centered Sr2NaMg2V3O12:Eu is an efficient thermometric and thermochromic luminescent material for optical thermometry and safety sign applications in a high‐temperature environment.

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Vibrationally Induced Photophysical Response of Sr₂NaMg₂V₃O₁₂:Eu³⁺ for Dual‐Mode Temperature Sensing and Safety Signs

Bindhu

Naseemabeevi

Subodh

2021

Advanced Photonics Research

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Deciphering crystal structure and photophysical response of Bi3+ and Pr3+ co-doped Li3Gd3Te2O12 for lighting and ratiometric temperature sensing

Bindhu

Priya

Naseemabeevi

et al. 2022

Journal of Alloys and Compounds

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Europium Doped SrSnO₃ Perovskite: Structural, Spectroscopic, and Luminescent Characterization for Advanced Lighting Technologies and Beyond

Bhat,

Bi,

Ganie

et al. 2024

Energy Fuels

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This study explores the incorporation of Eu 3+ ions into SrSnO 3 and their effect on the structural, spectroscopic, and luminescent properties. X-ray diffraction (XRD) and Fouriertransform infrared (FTIR) analysis confirm the successful doping of Eu 3+ . Density functional theory (DFT) calculations reveal an indirect band gap, with an estimated experimental value of 2.8 eV for 5% Eu 3+ , as determined by diffuse reflectance spectroscopy (DRS). Photoluminescence (PL) analysis shows a red emission at 612 nm, corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. Under 256 nm UV excitation, the optimal luminescent properties were observed at 5 mol % Eu 3+ , displaying a predominant red emission at 612 nm attributed to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. The study found that emission intensity decreased beyond a certain concentration due to concentration quenching effects determined through Blasse equation. Judd−Ofelt intensity parameters were calculated from the emission spectra, and Ω 2 and Ω 4 , are (1.15 and 1.09) × 10 −20 cm 2 , respectively for 5% Eu 3+ doped SrSnO 3 . The emission properties for the

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Novel self -activated Na2BiMgZnV3O12 Yellow-Green phosphor for N-UV excited WLEDs

Cited by 5 publications

References 11 publications

Vibrationally Induced Photophysical Response of Sr₂NaMg₂V₃O₁₂:Eu³⁺ for Dual‐Mode Temperature Sensing and Safety Signs

Vibrationally Induced Photophysical Response of Sr₂NaMg₂V₃O₁₂:Eu³⁺ for Dual‐Mode Temperature Sensing and Safety Signs

Deciphering crystal structure and photophysical response of Bi3+ and Pr3+ co-doped Li3Gd3Te2O12 for lighting and ratiometric temperature sensing

Europium Doped SrSnO₃ Perovskite: Structural, Spectroscopic, and Luminescent Characterization for Advanced Lighting Technologies and Beyond

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Product

Resources

About

Novel self -activated Na2BiMgZnV3O12 Yellow-Green phosphor for N-UV excited WLEDs

Cited by 5 publications

References 11 publications

Vibrationally Induced Photophysical Response of Sr2NaMg2V3O12:Eu3+ for Dual‐Mode Temperature Sensing and Safety Signs

Vibrationally Induced Photophysical Response of Sr2NaMg2V3O12:Eu3+ for Dual‐Mode Temperature Sensing and Safety Signs

Deciphering crystal structure and photophysical response of Bi3+ and Pr3+ co-doped Li3Gd3Te2O12 for lighting and ratiometric temperature sensing

Europium Doped SrSnO3 Perovskite: Structural, Spectroscopic, and Luminescent Characterization for Advanced Lighting Technologies and Beyond

Contact Info

Product

Resources

About

Vibrationally Induced Photophysical Response of Sr₂NaMg₂V₃O₁₂:Eu³⁺ for Dual‐Mode Temperature Sensing and Safety Signs

Vibrationally Induced Photophysical Response of Sr₂NaMg₂V₃O₁₂:Eu³⁺ for Dual‐Mode Temperature Sensing and Safety Signs

Europium Doped SrSnO₃ Perovskite: Structural, Spectroscopic, and Luminescent Characterization for Advanced Lighting Technologies and Beyond