Optical absorbance and fluorescence of natural dyes: prospect of application in dye sensitized solar cell and OLEDs.

P Lamichhane, PN Paudel, BP Kafle - 2015 - cabidigitallibrary.org
2015cabidigitallibrary.org
Optical properties (absorbance and fluorescence) total of 15 natural dye samples were
investigated in the wavelength range of λ= 310-800 nm; using UV-Vis, Fluorescence and IR
spectroscopy. The natural dye from an oven dried raw samples of either flowers or leaves of
selected plants were extracted by using both the polar and non-polar solvents. Dye
extracted from leaves of Lawsonia intermis, Nyctanthes arbor-tristis using cyclohexane as a
solvent showed broad absorbance in the visible region from 580 nm up to 700 nm. Also dye …
Abstract
Optical properties (absorbance and fluorescence) total of 15 natural dye samples were investigated in the wavelength range of λ=310-800 nm; using UV-Vis, Fluorescence and IR spectroscopy. The natural dye from an oven dried raw samples of either flowers or leaves of selected plants were extracted by using both the polar and non-polar solvents. Dye extracted from leaves of Lawsonia intermis, Nyctanthes arbor-tristis using cyclohexane as a solvent showed broad absorbance in the visible region from 580 nm up to 700 nm. Also dye extracted from Callistemon citrinus and Gomphrena globosa using water solvent exhibited strong absorbance from 420 up to 640 nm. Dye extracted in cyclohexane from Lawsonia intermis, Nyctanthes arbor-tristis showed intense and strong fluorescence at 350 nm, slightly broad and weak signals at 500 nm and 675 nm are also observed. Moreover, the extracts from Gomphrena globosa using water as a solvent showed broad and strong fluorescence at 340-500 nm and at near IR (700-800 nm), and a sharp characteristic peak at 520 nm. Therefore it is highly likely that, one of these four species could be good candidate as a sensitizer for fabricating dye sensitized solar cell and may also have high prospect in organic light emitting diodes (OLEDs).
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