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Probing into photoluminescence properties of trivalent rare earths (Gd3+/Tb3+/Dy3+/Eu3+) activated fluoro-elpasolites

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Abstract

Natural K2NaAlF6 compound is known to exist in elpasolite structure form, since years. In recent times, such fluoro-elpasolites activated by small amounts of Mn4+ have emerged as most propitious red-phosphor for solid-state lighting purposes. Fluoro-elpasolites such as K2LiAlF6 and K2NaAlF6 are easy to prepare via simple precipitation method. In present work, fresh photoluminescence studies on rare earth-doped trivalent ions are reported in these hosts. Gadolinium added phosphors showed interesting PL properties with different concentrations. Also, really long lifetimes of luminescence decay curves were recorded for these phosphors. Other dopants such as terbium, dysprosium and europium in their trivalent form also showed their characteristic PL spectra. Previously, PL studies on Eu2+ and Ce3+ doped on these compounds have been already done and reported elsewhere. Phase-structural, morphological and elemental analysis has been also carried out on these compounds using various XRD, SEM and EDS techniques. Particles are found to be of bigger size then 1 µm i.e. in micro-range using DLS measurement. In the end, CIE coordinates and CCT(K) were calculated for phosphors, with PL emissions lying within the visible range of radiation spectrum.

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Acknowledgements

This study is financially supported by CSIR, Government of India under Grant No. 31/0001(11936)/2021-EMR-I. Authors are extremely thankful to Dr. Naval Kishor Upadhyay of Advanced Carbon Products Metrology Section & Dr J. S. Tawale, CSIR—National Physical Laboratory, New Delhi for XRD, SEM and EDS measurements. Authors are also wants to show their indebt gratitude towards Ms. Sonali Mehra and Dr. Shailesh Narain Sharma of Advanced Materials & Devices Metrology Division, CSIR- National Physical Laboratory, New Delhi for DLS observations.

Funding

This study is financially supported by CSIR, Government of India under Grant No. 31/0001(11936)/2021-EMR-I.

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Authors and Affiliations

  1. Advanced Carbon Products and Metrology, CSIR-NPL, Dr. K. S. Krishnan Marg, New Delhi, 110012, India

    Vartika S. Singh & S. R. Dhakate

  2. Department of Physics, Amolakchand Mahavidyalaya, Yavatmal, Maharashtra, 445001, India

    P. V. Tumram

  3. Shri Ramdeobaba College of Engineering and Management, Katol Road, Nagpur, 440013, India

    P. D. Belsare

  4. University Department of Physics, R. T. M. Nagpur University, Nagpur, 440033, India

    S. V. Moharil

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  1. Vartika S. Singh
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Contributions

VSS: Synthesis. SRD: Writing—review & editing. PVT: Data analysis and curation. PDB: Characterization. SVM: Basic concept.

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Correspondence to Vartika S. Singh or S. R. Dhakate.

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Singh, V.S., Dhakate, S.R., Tumram, P.V. et al. Probing into photoluminescence properties of trivalent rare earths (Gd3+/Tb3+/Dy3+/Eu3+) activated fluoro-elpasolites. J Mater Sci: Mater Electron 34, 1087 (2023). https://doi.org/10.1007/s10854-023-10506-7

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