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Combustion Synthesis and Study of Double Charge Transfer in Highly Efficient Cool White-emitting Dy3+ Activated Vanadate-based Nanophosphor for Advanced Solid-state Lighting

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Abstract

A series of Ca9Gd(VO4)7: Dy3+ (x = 0.01–0.20) nanophosphor crystals emitting a cool white light were synthesized by solution combustion methodology. The X-ray diffraction patterns were analyzed and processed using Rietveld refinement. The fabricated nanophosphor was found to crystallize in a trigonal crystal lattice with space group R3c(161). The morphological behavior of the prepared nanophosphor was investigated using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The photoluminescence properties of the nanophosphor correspond to cool white emission upon near-ultraviolet (NUV) excitation at 327 nm due to 4F9/2 → 6H15/2 (bluish) and 4F9/2 → 6H13/2 (yellowish) radiative relaxations at 487 nm and 576 nm respectively. Also, there is a strong occurrence of double charge transfer from O2− ions to Dy3+ and V5+ ions with the latter being stronger due to the high positive charge of V5+ ions. Color coordinates (x = 0.2878, y = 0.3259) are consistent with white emission. Auzel's model was implemented to examine the non-radiative relaxation (113.5 ms−1), radiative lifetime (1.4856 ms), and quantum efficiency (83.13%) values. The crystalline and optical behavior of the synthesized cool white emitting nanophosphor facilitates its use in near-UV-based WLEDs and other advanced solid-state lighting.

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Availability of Data and Materials

The data used in the current research work can be made available on reasonable request from the corresponding author (Dr. Rajesh Kumar Malik).

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Acknowledgements

The authors are highly thankful to the department of chemistry, Maharshi Dayanand University, Rohtak for providing chemicals and instrumental facilities.

Funding

The author, Hina Dalal, received financial support from the University Grants Commission in the form of SRF (Award no. 49/(CSIR-UGC NET JUNE 2019)) to carry out this research work properly.

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Authors and Affiliations

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

    Hina Dalal, Mukesh Kumar, Priyanka Sehrawat, Monika Sheoran, Neeraj Sehrawat & Rajesh Kumar Malik

  2. Department of Chemistry, Banasthali Vidyapith, Banasthali, 304022, India

    Suman Devi & Poonam Devi

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  1. Hina Dalal
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  2. Mukesh Kumar
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Contributions

Hina Dalal and Mukesh Kumar: Data analysis, original draft writing, Suman Devi and Priyanka Sehrawat: Review Writing, Monika Sheoran, Poonam Devi and Neeraj Sehrawat: Conceptualization and Methodology, Rajesh Kumar Malik: Results discussion and supervision.

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Correspondence to Rajesh Kumar Malik.

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Dalal, H., Kumar, M., Devi, S. et al. Combustion Synthesis and Study of Double Charge Transfer in Highly Efficient Cool White-emitting Dy3+ Activated Vanadate-based Nanophosphor for Advanced Solid-state Lighting. J Fluoresc 33, 497–508 (2023). https://doi.org/10.1007/s10895-022-03098-8

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