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Design of color tunable SrLa2Al2O7:Eu3+ perovskite type nanophosphor for near-ultraviolet excited white LEDs

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Abstract

Eu3+-doped SrLa2Al2O7 (0.5–30 mol%) nano-series was well-synthesized through an effective solution combustion (SC) way. A tetragonal prototype with S.G.–I4/mmm (139) & lattice parameters for SrLa2(1−x)Al2O7:xEu3+ (x = 20 mol%) nanosample have been measured and analyzed via Rietveld refinement process. Surface morphology, crystallite size and chemical composition of SrLa2(1−x)Al2O7:xEu3+ (x = 20 mol%) nanopowder are checked through SEM, TEM & EDS analysis. The energy band-gap (Eg = 4.62 eV) is determined for optimum (x = 20 mol%) composition using DR measurements. Further, 396 nm energy excitation provides blue-white-red emissions with intense band at 621 nm, deriving from 5D0‐7F2 transition of Eu3+ ions. The critical separation among dopant centres for x = 20 mol% is found as 8.82 Å, for which dipole-quadrupole (s = 8.04) energy transfer mechanism is determined. Judd–Ofelt (J-O) theory is used to evaluate the intensity parameters Ωλ (λ = 2, 4) = 1.38 × 10–20 & 0.24 × 10–20 cm2 of Eu3+ ions in SrLa2Al2O7 host lattice. The results give CIE color coordinates covering blue to red region (x = 0.2452, y = 0.2380 to x = 0.6376, y = 0.3527) and CCT value range (30,812-1807 K) for warm as well as cool light emission. Finally, the concentration-dependent chromatic behaviour in blue-white-red region reflects the role of Eu3+-activated SrLa2Al2O7 nanophosphor in single-phased as well as RGB-based NUV-WLEDs.

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Acknowledgements

One of the authors, Sushma Devi gratefully acknowledges the financial support in the form of senior research fellowship (SRF) from University Grant Commission (UGC), New Delhi, India (Award No. 2061410088).

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Authors and Affiliations

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

    Sushma Devi, V. B. Taxak, Anju Hooda & S. P. Khatkar

  2. Department of Chemistry, Pt. N.R.S. Govt. College, Rohtak, India

    Dayawati Sangwan

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  1. Sushma Devi
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  2. V. B. Taxak
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  3. Dayawati Sangwan
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  4. Anju Hooda
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  5. S. P. Khatkar
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Contributions

SD: Conceptualization, Methodology, Software, Writing – original draft. VBT: Software validation, Visualization, Writing – Review & Editing. DS: Formal analysis, Validation, Conceptualization. AH: Methodology, Formal analysis, Software. SPK: Project administration, Supervision.

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Correspondence to S. P. Khatkar.

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Devi, S., Taxak, V.B., Sangwan, D. et al. Design of color tunable SrLa2Al2O7:Eu3+ perovskite type nanophosphor for near-ultraviolet excited white LEDs. J Mater Sci: Mater Electron 33, 5983–5996 (2022). https://doi.org/10.1007/s10854-022-07778-w

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  • DOI: https://doi.org/10.1007/s10854-022-07778-w

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