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KSrVO4:Tb3+−A potential green-emitting nanophosphor candidate for white LEDs

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Abstract

The present work reports the preparation of KSr(1 − 3x/2)VO4:xTb3+ powders (x = 0 to 5.0 mol%) via low-cost combustion route. The XRD study affirms the phase purity of the phosphors and established the nano-size of the powdered grains which is also supported by Transmission Electron Microscopy (TEM) studies. The UV–Vis spectroscopy reveals that the title phosphor has appreciable absorption efficiency in the UV excitation range from 190 to 400 nm. The optical band gap and Urbach energy, respectively, were estimated to be 3.62 eV and 100.6 meV. The photoluminescence (PL) spectra shows that under 311 nm UV excitation corresponding to 4f8-4f75d transition of Tb3+, this phosphor exhibited the characteristic green emission with enhanced intensity which was ascribed to electric dipole transition 5D4 → 7F5 of Tb3+ ion. The CIE chromaticity coordinates were used to find dominant wavelength, excitation purity and color correlated temperature (CCT) of the phosphor. The nanophosphor has potential to be explored as the green-emitting candidate for white light LEDs for reflected light illumination applications.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are thankful to the Sophisticated Analytical Instrumentation Facility (SAIF), Panjab University, Chandigarh for its valuable support and quick service in collecting data from powder XRD and HRTEM facility at subsidised charges.

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Authors and Affiliations

  1. School of Physics, Shri Mata Vaishno Devi University, Katra, J and K, 182320, India

    Pankaj Biswas &  Kamni

  2. Department of Physics and Astronomical Sciences, Central University of Jammu, Rahya-Suchani, Samba, J and K, 181143, India

    Vinay Kumar

Authors
  1. Pankaj Biswas
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  2. Vinay Kumar
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  3. Kamni
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Contributions

PB Data collection, Methodology, Software, Formal analysis, Validation, Writing—original draft. VK Conceptualization, Investigation, Validation, Writing—review and editing. K Writing—review and editing, Visualization.

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Correspondence to Pankaj Biswas.

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Biswas, P., Kumar, V. & Kamni KSrVO4:Tb3+−A potential green-emitting nanophosphor candidate for white LEDs. J Mater Sci: Mater Electron 34, 149 (2023). https://doi.org/10.1007/s10854-022-09633-4

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