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Luminescence Dynamics of BaAl2O4:Eu2+ Phosphor

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Abstract

We studied steady-state and time-resolved photoluminescence of Eu doped BaAl2O4 phosphor. The undoped BaAl2O4 sample shows a dominant blue emission band at ~ 428 nm and two secondary maxima at ~ 405 and 456 nm due to F-centre and aggregate defects such as F2 -centre. The samples after doping of Eu at 1–5% show additional emission bands at ~ 485 and 518 nm due to Eu2+ centre and a red emission band at ~ 657 nm is attributed to Eu3+ centre. The sample doped with 2% of Eu shows anomalous emission having the dominant peak at ~ 494 nm. The average luminescence lifetime of the emission band at ~ 428 nm in the undoped sample was estimated to be (3.29 ± 0.91) ns. The average luminescence lifetime of this emission band after doping of Eu was found to increase by 102 orders of magnitude. The intensity of the 428 nm blue emission band was found to quench after doping of Eu beyond 3%. The concentration quenching effect was attributed to dipole-quadrupole interaction. Further, a non-radiative fluorescence energy transfer mechanism from an extrinsic Eu2+ centre to an intrinsic F-centre is proposed to describe the luminescence dynamics of the samples.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author.

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Acknowledgements

This work was supported by Cotton University In-house Research Project grant (Grant number: CU/Dean/R&D/2019/02/23 Dt.13/11/2023). J.M.K gratefully acknowledge Cotton University for providing the financial support under the Cotton University In-house Research Project grant. M.K. and J.M.K. thank the Department of Chemistry, Cotton University for providing the UV-Vis-IR absorption report. M.K. and J.M.K. also thank Institute of Advanced Study in Science and Technology (IASST), Guwahati for TR-PL measurements.

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  1. Department of Physics, Cotton University, Guwahati, 781001, India

    Manash Kalita & J. M. Kalita

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  1. Manash Kalita
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M.K. and J.M.K. wrote the main manuscript text and prepared all the figures. All authors reviewed the manuscript.

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Correspondence to J. M. Kalita.

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Kalita, M., Kalita, J.M. Luminescence Dynamics of BaAl2O4:Eu2+ Phosphor. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03759-w

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