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SrWO4: Er3+; an efficient green phosphor for LED and optical thermometry applications

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Abstract

The present article reports the up- and down-conversion photoluminescence studies of Er3+-activated SrWO4 (SWO) phosphors. The synthesized samples are characterized by different characterization instruments. The phase formation and particle morphology are ensured through X-ray diffractogram, Field emission scanning electron microscopy (FESEM), and Transmission electron microscopy (TEM). Fourier Transform Infrared spectroscopy (FTIR) is used to gather chemical and structural information through the identification of vibrational bands of the sample. The elemental compositions and their oxidation states are determined using X-ray photoelectron spectroscopy (XPS). Diffuse reflectance spectroscopy is used to analyze the reflectance spectra and obtain the optical bandgap of the material. The photoluminescence down-conversion (DC) and up-conversion (UC) emissions are obtained in the green region under near-ultraviolet (UV) excitation of 379 nm and near-infrared excitation of 980 nm, respectively. Bright green LED is fabricated by coating the prepared phosphor on a 365 nm UV LED chip. Temperature-dependent UC is conducted to explore the temperature sensing performance of the material. The material exhibits excellent thermal stability and temperature sensing sensitivity of 7.8 ⋅ 10− 3 K− 1 under UC study. The proposed material can be developed as a near-UV excited green phosphor for white-LED and non-contact optical temperature sensor.

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The data are represented in the manuscript in the form of graphs. The raw data will be made available on reasonable request.

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Acknowledgements

The authors are highly obliged to IIT (ISM) Dhanbad, India for financially and technically encouraging the work. We also appreciate CRF, IIT (ISM) Dhanbad for providing characterization facilities. We are also thankful to Dr. K. Kumar, Department of Physics, IIT (ISM) Dhanbad for providing up-conversion measurement facility.

Funding

The research fellowship and contingency grant to support this work are provided by IIT (ISM) Dhanbad.

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  1. Department of Physics, Indian Institute of Technology (ISM) Dhanbad, Dhanbad, Jharkhand, 826004, India

    Ram Gopal & Jairam Manam

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Sample synthesis, data acquisition, analysis, and manuscript writing were done by Ram Gopal. Final editing and supervision were done by Jairam Manam.

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Gopal, R., Manam, J. SrWO4: Er3+; an efficient green phosphor for LED and optical thermometry applications. J Mater Sci: Mater Electron 33, 21746–21761 (2022). https://doi.org/10.1007/s10854-022-08964-6

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