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Preparation and Judd-Ofelt Analysis of Warm Red Luminescent Eu3+ Complexes for Semiconductor Lasing Devices

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Abstract

Six novel red photoluminescent Eu3+ complexes with 3-formyl chromone as the primary sensitizer (L) were synthesized using the solution precipitation method. These complexes are [Eu(L3).X] where X is 2H2O (C1), phen (C2), neo (C3), bipy (C4), dmph (C5), and biquno (C6). These complexes were characterized by elemental analysis, EDAX analysis, SEM, FT-IR, thermo-gravimetric analysis (TGA/DTA) and photoluminescence spectra. The transition rates, quantum efficiency, and J-O intensity parameters were calculated using emission data and luminescence decay time (τ). Complexes exhibit a strong emission peak (5D0 → 7F2) of the Eu3+ ion in their luminescence emission spectra in solid and solution states, making them an effective emitter of the red color in OLEDs. The branching ratio of these complexes ranges from 80.67–82.92 in solid and 50.53–62.65 in solution state; CIE color coordinate of complexes falls in the red region. The color purity ranges [CP(%)] values for solid 95.26–97.27% and for solution ranges 85.11–93.43%. Correlated color temperature (CCT) of the complexes (C1–C6) ranged from 2710 to 3049 K in the solid state and 1775 to 2450 K in the solution state. These complexes are promising red emitters in OLEDs, semiconductors, and leasing devices.

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Acknowledgments

Manoj Kumar one of the authors gratefully acknowledges the Department of Chemistry and UIET, M.D. University Rohtak for providing instrumental facilities.

Code Availability

No software or any computational study was not used in this study.

Funding

Manoj Kumar, one of the authors is thankful for the financial support from University Research Scholarship (URS) MDU, Rohtak letter no. R&S/R-12/22/URS/5939 to complete this work.

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Authors and Affiliations

  1. University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, 124001, India

    Manoj Kumar, Pratibha Ahlawat, Poonam Kumari, Harkesh Sehrawat & Rajesh Kumar

  2. Shri Guru Ram Rai Institute of medical and Health Sciences, Dehradun, 248001, India

    Vaishnavi Lather

  3. Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology, Sonipat, 131039, India

    Aarti Khatkar

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  1. Manoj Kumar
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Contributions

M. K.: Investigation, Formal analysis, Writing - original draft. P. A.: Writing - review & editing. P. K., A. K.: Contribution in analysis. V. L., H. S.: Contributed in investigation. R. K.: Supervision, Writing - review & editing.

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Correspondence to Rajesh Kumar.

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Kumar, M., Ahlawat, P., Kumari, P. et al. Preparation and Judd-Ofelt Analysis of Warm Red Luminescent Eu3+ Complexes for Semiconductor Lasing Devices. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03780-z

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