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Impact of alkali metals (M =  Li, Na, and K) co-doping on luminescence properties of hydrothermally synthesized YVO4:Dy3+ phosphors

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Abstract

In this work, the luminescence properties of YVO4:Dy3+ are modified by co-doping of alkali metals (M = Li, Na, and K), and the materials were prepared by hydrothermal technique followed by its calcination at 500 °C. By analyzing Powder X-ray Diffraction (P-XRD), SEM and TEM, Fourier transform infrared (FTIR), optical absorption and photoluminescence techniques, as well as UV-DRS spectroscopy of the as-prepared products, it was determined that co-doping of alkali metals affects the properties of crystal phase and photoluminescence. The P-XRD pattern reveals the formation of the tetragonal crystalline phase. On the other hand, morphological studies show that samples have regular bipyramidal structures. Functional group analysis shows the band near 500 cm−1 attributed to Y–O absorption. An intense band around 781 cm−1 corresponds to symmetrical stretching due to the V–O vibration of the VO43− group. Furthermore, in PL emission spectra, the most intense emission peak was observed at 573 nm, due to the 4F9/2 → 6H13/2 transition of Dy3+ on excitation at 320 nm. Among the above-described alkali metal ions (such as Li+, Na+, and K+), K+ effectively enhances the intensity of the prominent emission peak located at 573 nm. The optimum concentration of K+ ion co-doping for improvement in the photoluminescence properties of yttrium vanadate doped with Dy3+ phosphor was found to be 10 at.%. Tauc relation and Kubelka–Munk relation were used to calculate the band gaps of samples. The calculated band gaps of YVO4:5 at.%Dy3+:5 at.% M+ (M+  = Li+, Na+, and K+) and YVO4:5 at.%Dy3+:x at.% K+ (x = 0, 1, 3, 5, 7, 10 and 15) samples were found to be 3.42, 3.69,3.73 eV, 3.62, 3.61, 3.63, 3.62, 3.61, 3.60 and 3.62 eV, respectively. For YVO4:Dy3+, the (x,y) values of calculated CIE chromaticity color coordinates are (0.40, 0.47), which is in the yellow range and suitable for display device applications.

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Acknowledgements

The authors gratefully acknowledge SIC (Sophisticated Instrument Center) of Dr. Harisingh Gour Vishwavidyalaya, Sagar for providing various characterization facilities. I would also like to thank National Taiwan university for providing SEM facility. Bhavani Chakravarti, one of the authors, thanks the University Grants Commission (UGC), Government of India, for financial assistance for this study through the National Fellowship for OBC Candidates scheme.

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Authors and Affiliations

  1. Department of Chemistry, Dr. Harisingh Gour University, Sagar, M.P, 470003, India

    Bhavani Chakravarti & Anand Prakash Mishra

  2. Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC

    Rajan Kumar Singh

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  1. Bhavani Chakravarti
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  2. Anand Prakash Mishra
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Contributions

APM contributed significantly to the execution and explanation of the experimental ideas and also did the editing. RKS assisted with data organization and editing. Conceptions, data analysis, investigation, writing, and manuscript editing were all done by BC.

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Correspondence to Bhavani Chakravarti.

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Chakravarti, B., Mishra, A.P. & Singh, R.K. Impact of alkali metals (M =  Li, Na, and K) co-doping on luminescence properties of hydrothermally synthesized YVO4:Dy3+ phosphors. J Mater Sci: Mater Electron 34, 133 (2023). https://doi.org/10.1007/s10854-022-09635-2

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