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Exploration of Optical and Radiative Properties of Fluorinated β-keto Carboxylate Tb3+ Complexes Emanating Cool Green Light

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Abstract

Tb3+ complexes with β-ketocarboxylic acid as main ligand and heterocyclic systems as auxiliary ligand were synthesized and analyzed to assess their prospective relevance as green light emitting material. The complexes were characterized via various spectroscopic techniques and were found to be stable up to ≈ 200 ℃. Photoluminescent (PL) investigation was performed to assess the emissive nature of complexes. Longest luminescence time of decay (1.34 ms) and highest intrinsic quantum efficiency (63.05%) were fetched for complex T5. Color purity of complexes was found to be in range 97.1 – 99.8% which demonstrated the aptness of these complexes in green color display devices. NIR Absorption spectra were employed to evaluate Judd–Ofelt parameters to appraise the luminous performance and environment encircling Tb3+ ions. The JO parameters were found to follow the order: Ω2 > Ω4 > Ω6 and suggested the higher covalence character in complexes. Theoretical branching ratio in the range 65.32 – 72.68%, large stimulated emission cross section and narrow FWHM for 5D4 → 7F5 transition unlocked the relevance of these complexes as a green color laser media. Band gap and Urbach analysis were consummated via enforcing nonlinear curve fit function on absorption data. Two band gaps with values in between 2.02 – 2.93 eV established the prospective use of complexes in photovoltaic devices. Energies of HOMO and LUMO were estimated employing geometrically optimized structures of complexes. Investigation of biological properties accomplished via antioxidant and antimicrobial assays which communicated their applicability in biomedical domain.

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Funding

Savita Khatri, One of the authors appraises the monetary assistance from Radhakrishnan Foundation, Maharshi Dayanand University, Rohtak, India, in the form of a Minor research project (Award No: DSW/2020/430) to complete this research work.

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Authors and Affiliations

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

    Savita Khatri, Yudhvir Singh, Poonam Kumari & Rajesh Kumar

  2. BPS Govt. Medical College for Women, Khanpur, Sonepat, 131305, India

    Deepanita Khatri

  3. Shri Guru Ram Rai Institute of Medical And Health Sciences, Dehradun, Utterakhand, 248001, India

    Vaishnavi Lather

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

    S. P. Khatkar & V. B. Taxak

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  1. Savita Khatri
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Contributions

Savita Khatri performed Experimental works, conceptualisation, data collection, analysis, interpretation writting original manuscript; Deepanita Khatri and Vaishnavi Lather helped in review and editing of Biological properties; Yudhvir Singh contributed to software validation; Poonam Kumari contributed to reviewing and editing the manuscript. V.B. Taxak and S. P. Khatkar contributed to review, visualisation and supervision. Rajesh Kumar contributed to supervision, technical support, editing functions and manuscript review.

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Correspondence to Rajesh Kumar.

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Khatri, S., Khatri, D., Lather, V. et al. Exploration of Optical and Radiative Properties of Fluorinated β-keto Carboxylate Tb3+ Complexes Emanating Cool Green Light. J Fluoresc 33, 1861–1885 (2023). https://doi.org/10.1007/s10895-023-03177-4

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