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Crystal structure and photoluminescent analysis of bright orange-red emanating Sm3+-doped Ca9Bi(VO4)7 nanophosphor for WLEDs

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Abstract

A bright orange-red emanating Ca9Bi1−x(VO4)7:xSm3+ (x = 0.05–0.5) nanophosphor crystalline series has been synthesized for the first time through solution combustion route. X-ray diffraction pattern of Ca9Bi0.80Sm0.20(VO4)7 was analyzed and processed using Rietveld Refinement. The nanophosphors synthesized were found to crystallize in trigonal crystal lattice with R3c(161) space group. The morphological behavior of prepared nanophosphors was studied by means of transmission electron microscopy (TEM). The photoluminescence nature of the nanophosphors corresponds to bright orange emission due to near-ultraviolet (NUV) excitation at 405 nm followed by 4G5/2 → 6H7/2 radiative relaxation. The chromaticity coordinates (x = 0.5504, y = 0.4484) are in harmony with the intense orange-red emission. The decay curves been well fitted in 1st-order exponential decay function indicate that a single type of crystallographic site is occupied by the dopant-Sm3+ ions in host lattice. Auzel’s model was implemented to investigate into rates of nonradiative relaxation (302.008 s−1), radiative lifetime (0.76 ms), and quantum efficiency (81%) values. The crystalline and optical behavior of the synthesized orange-red emitting nanophosphors promote their usage in near UV-based WLEDS.

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Acknowledgements

Ms. Priya Phogat, thankfully acknowledges the “University Grants Commission” (UGC), New Delhi, India for providing financial support to the research work by means of junior research fellowship (JRF, Award no: 128/CSIR-UGC NET DEC 2017).

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Authors and Affiliations

  1. Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India

    Priya Phogat, S. P. Khatkar, R. K. Malik, Jyoti Dalal, Monika Punia & V. B. Taxak

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  1. Priya Phogat
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  2. S. P. Khatkar
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Correspondence to V. B. Taxak.

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Phogat, P., Khatkar, S.P., Malik, R.K. et al. Crystal structure and photoluminescent analysis of bright orange-red emanating Sm3+-doped Ca9Bi(VO4)7 nanophosphor for WLEDs. J Mater Sci: Mater Electron 32, 8615–8627 (2021). https://doi.org/10.1007/s10854-021-05504-6

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