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A quantum yield map for synthetic eumelanin.

Stephen P Nighswander-Rempel¹, Jennifer Riesz, Joel Gilmore

¹Centre for Biophotonics and Laser Science, School of Physical Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia. snighrem@physics.uq.edu.au

The Journal of Chemical Physics

|December 3, 2005

Summary

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Synthetic eumelanin

Area of Science:

Photochemistry
Biophysics
Materials Science

Background:

The quantum yield of synthetic eumelanin is notably low.
Previous studies suggested a dependence of quantum yield on excitation wavelength.

Purpose of the Study:

To quantify synthetic eumelanin's quantum yield across excitation wavelengths (250-500 nm).
To map steady-state fluorescence and specific quantum yield.
To correlate these properties with structural models and melanin biofunctionality.

Main Methods:

Spectroscopic analysis of synthetic eumelanin.
Measurement of quantum yield as a function of excitation wavelength.
Creation of 2D and 3D fluorescence and specific quantum yield maps.

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Main Results:

Quantum yield is 4x higher at 250 nm than at 500 nm.
A detailed map of specific quantum yield was generated.
Radiative emission and specific quantum yield are minimal outside 385-585 nm (3.2-2.2 eV).

Conclusions:

The study provides a comprehensive understanding of synthetic eumelanin's photophysical properties.
Findings offer insights into melanin's role in biological functions and quantum molecular biophysics.
Specific structural features influence radiative emission characteristics.