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Anthocyanins of Delonix Regia Floral Petals: A Novel Approach on Fluorescence Enhancement, Forster Resonance Energy Transfer Mechanism and Photostability Studies for Optoelectronic Applications

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Abstract

In this work, we focused on extracting the anthocyanin dye in acetone, butanol, ethanol, and water solvents from Delonix regia flowers by a simple maceration extraction process. The identification of functional group analysis, vibrational studies, energy transfer mechanisms, optoelectronic properties, photostability studies, FRET-assisted potential light emissions and photometric properties of the anthocyanin dyes are successively investigated. FTIR spectroscopy and vibrational studies have confirmed the existence of polyphenolic groups in 2-phenyl chromenylium (anthocyanin) dyes. The optoelectronic results show the least direct bandgap (2.04 eV), indirect bandgap (1.55 eV), Urbach energy (0.380 eV), high refractive index (1.20), dielectric constant (2.794), and high optical conductivity (1.954 × 103 S/m) for the anthocyanin dye extracted found in water solvent. The photoluminescence properties such as Stoke’s shift, high quantum yield, and lifetime results show that anthocyanin dyes are promising candidates for red-LEDs and optical materials. The absorption and emission spectra of the anthocyanin dyes follow the mirror image rule and the Franck-Condon factor exists between vibrational energy levels corresponding to all the electronic transitions. The excellent correspondence between the absorption and emission spectra reinforces that the anthocyanins are efficient (46%) FRET probes. Further, photometric properties such as CIE, CRI, CCT and colour purity results of anthocyanins in all studied solvents revealed that this material exhibits orange to red shades (x = 0.48 → 0.54 and y = 0.36 →0.45) and is well suitable for have great potential in the manufacturing of Organic-LEDs and other optoelectronic device applications.

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Authors and Affiliations

  1. Department of Physics, Bangalore University, Jnanabharathi campus, Bengaluru, 560056, India

    D. Harshitha & C. G. Renuka

  2. Department of Physics, Government First Grade College, Sindhanur, 584128, India

    Anil Kumar

  3. Department of Electronic Science, Bangalore University, Jnanabharathi campus, Bangalore, 560056, India

    H. M. Mahesh

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  4. C. G. Renuka
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Harshitha. D: Writing – review & editing, Writing Original draft, visualization, validation. Anil Kumar: Calculations - Förster Resonance Energy transfer parameters. Mahesh H. M: Analysis- UV-Visible spectroscopy.C.G. Renuka: Writing – review & editing, Supervision, Data curation, visualization, validation.

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Harshitha, D., Kumar, A., Mahesh, H.M. et al. Anthocyanins of Delonix Regia Floral Petals: A Novel Approach on Fluorescence Enhancement, Forster Resonance Energy Transfer Mechanism and Photostability Studies for Optoelectronic Applications. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03730-9

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