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Novel orange-red-emitting Li2Ba5(WO5)3:Eu3+ phosphor for w-LEDs and non-contact thermometry applications

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Abstract

Novel Eu3+-activated orange-red phosphors Li2Ba(5−x)(WO5)3:xEu3+ (LBW:xEu3+) (here, 1 ≤  x  ≤ 9, ∆x = 2, and x is the mol%) were successfully prepared via high-temperature solid-phase reaction. The X-ray diffraction (XRD) patterns were recorded for structural analysis and phase identification of the synthesized phosphors. Morphological analysis was done using scanning electron microscopy (SEM). The optical bandgap value has been measured using diffuse reflectance spectra (DRS). The photoluminescence (PL) emission spectra recorded for the LBW:xEu3+ phosphors under 322 and 396 nm excitation reveal strong visible orange-red emission at 595 nm corresponding to 5D0→7F1 transition of Eu3+ ions. The CIE chromaticity coordinates were estimated for all the phosphors and were found to be in the deep orange-red region. The PL decay spectral profiles recorded at 595 nm emission when excited with 322 nm light showed a consistent exponential pattern. The experimental lifetimes were observed to decrease as the concentration of Eu3+ ions increased. In order to study the luminescence intensity ratio (LIR) of the paired emissions lines of Eu3+ as a function of temperature, PL measurements were carried out in the temperature range of 298–448 K. With a maximum sensitivity of nearly 1.21% K−1 at 298 K, the synthesized phosphors are relatively more sensitive at low temperatures. The aforementioned results represent that the synthesized LBW:Eu3+ phosphor samples can be employed in non-contact optical thermometry as well as in w-LED applications.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request. The datasets are presented in the main manuscript.

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Acknowledgements

One of the authors, Ms. Anu is very much thankful to CSIR/UGC for the award of a Junior Research Fellowship (JRF) (UGC Ref. 1352: CSIR-UGC NET DEC. 2018) to her.

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No funding was received to assist with the preparation of this manuscript. The authors declare they have no financial interest.

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  1. Department of Applied Physics, Delhi Technological University, Bawana Road, New Delhi, 110042, India

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A: conceptualization, methodology, experimental results, writing the original draft—ASR: conceptualization, validation, correction of draft manuscript, and editing.

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Correspondence to A. S. Rao.

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Anu, Rao, A.S. Novel orange-red-emitting Li2Ba5(WO5)3:Eu3+ phosphor for w-LEDs and non-contact thermometry applications. J Mater Sci: Mater Electron 34, 2191 (2023). https://doi.org/10.1007/s10854-023-11602-4

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