Abstract
In this present work, Dysprosium (Dy3+) ions doped potassium zinc strontium borate (KZSB) glasses were synthesized via the melt-quench method. X-ray diffraction (XRD) study of the prepared glasses shows a broad hump and confirms the amorphous nature of the glasses. Various vibrational shoulders were seen in the Fourier transform infrared (FT-IR) spectrum. Thermo gravimetric analysis–differential scanning calorimetry (TGA–DSC) was carried out to check the thermal stability and corresponding weight loss behavior of the un-doped sample. Absorption spectra were recorded for un-doped as well as doped glasses in the UV–VIS–NIR region, and the corresponding optical band gap was calculated. The photoluminescence (PL) spectra of as-prepared Dy3+ doped KZSB glasses under 350 nm excitation show three peaks at 482, 575 and 665 nm corresponding to the transitions 4F9/2 → 6H15/2, 6H13/2 and 6H11/2. Commission Internationale de I'Eclairage (CIE) chromaticity coordinates calculated from the emission data lie in the white region. The photometric analysis of prepared glasses under UV lamp with 365 nm excitation also shows white emission. Temperature-dependent PL (TDPL) investigation demonstrates the superiority in thermal stability of the as-prepared glasses, with an activation energy of 0.232 eV estimated for 0.5 mol% (optimized concentration of rare earth ion) of Dy3+ ions. After analyzing the results of all studies, we propose to use these borate glasses doped with Dy3+ ions for white light-emitting diodes (w-LEDs) fabrication and other solid state lighting (SSL) applications.
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Data availability
The data that support the findings of this study are available on request from the corresponding author Prof. A.S. Rao. The data are not publicly available due to restrictions, e.g. their containing information that could compromise the privacy of research participants.
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Acknowledgements
One of the authors Ms. Sheetal Kumari would like to thank the University Grants Commission (UGC), Government of India for providing her with Junior Research Fellowship (JRF) to carry out her research work at Delhi Technological University [1431/(CSIR-UGC NET JUNE 2019)].
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Ms. Sheetal Kumari was supported by a Junior Research Fellowship (JRF) awarded by CSIR-UGC, Government of India [1431/(CSIR-UGC NET JUNE 2019)].
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SK: work plan, experimental work, manuscript writing. Anu: experimental help, data analysis. AP: data analysis, validation of results, manuscript writing. PR: experimental help, calculations. ASR: work plan, validation of results, manuscript corrections.
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Kumari, S., Anu, Prasad, A. et al. Prospective applications of thermally stable Dy3+ doped potassium zinc strontium borate (KZSB) glasses in w-LEDs. J Mater Sci: Mater Electron 34, 907 (2023). https://doi.org/10.1007/s10854-023-10272-6
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DOI: https://doi.org/10.1007/s10854-023-10272-6