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White Light Emission from Vegetable Extracts.

Vikram Singh1, Ashok K Mishra1

  • 1Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036 India.

Scientific Reports
|June 18, 2015
PubMed
Summary

Researchers created white light emission (WLE) using red pomegranate and turmeric extracts. This simple, green method allows tunable color temperature for potential lighting applications.

Area of Science:

  • Natural product chemistry
  • Photophysics
  • Materials science

Background:

  • Developing sustainable and cost-effective light-emitting materials is crucial.
  • Plant-derived compounds offer a promising avenue for novel optical applications.
  • Previous research has explored natural pigments for light emission, but achieving pure white light efficiently remains a challenge.

Purpose of the Study:

  • To develop a simple, green method for producing white light emission (WLE) using natural extracts.
  • To investigate the photophysical mechanisms underlying WLE from a mixture of red pomegranate and turmeric extracts.
  • To demonstrate the tunability of WLE properties by adjusting pigment concentrations.

Main Methods:

  • Extraction of polyphenols, anthocyanins from red pomegranate, and curcumin from turmeric.

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  • Photoexcitation of the mixed extract in acidic ethanol, polyvinyl alcohol film, and gelatin gel at 380 nm.
  • Characterization of white light emission using Commission Internationale d'Eclairage (CIE) chromaticity index and color temperature measurements.
  • Analysis of energy transfer mechanisms, including Forster resonance energy transfer (FRET).

    • Main Results:

    • Achieved nearly pure white light emission (WLE) with CIE chromaticity index close to (0.35, 0.33) in acidic ethanol.
    • Successfully demonstrated WLE in solid matrices like polyvinyl alcohol film (0.32, 0.25) and gelatin gel (0.26, 0.33).
    • Showcased tunable color temperature of the WLE by varying the concentrations of pomegranate and turmeric extracts.
    • Identified polyphenols, anthocyanins, and curcumin as key emitting pigments and FRET as the critical energy transfer mechanism.

    Conclusions:

    • A simple, cost-effective, and relatively green method for generating tunable white light emission from red pomegranate and turmeric extracts has been established.
    • The synergistic interaction and cascade energy transfer among natural pigments are key to achieving high-quality white light.
    • This approach offers a sustainable alternative for developing novel white light-emitting materials for various applications.