Synthesis and optical properties of innovative degradable black pepper composite material

Abstract

Widely used as a medicinal plant in Ayurveda black pepper is also a main content of spices. Easily available of such kind of herb is studied the first time as a luminescence point of view. In this paper, we have studied luminescence characteristics of black pepper samples and check their properties for LED applications which are synthesized in four parts 1) Pure powder of black pepper 2) Black Pepper Solution by ethanol 3) Europium (Eu) doped black pepper solution and 4) Black Pepper thin film. The synthesized samples were characterized by Photoluminescence (PL) techniques. The PL characteristics for all four samples showed interesting results. Pure black pepper powder showed PL emission at 471nm under 421nm excitation wavelength. Black pepper solution shows an emission band around 430nm under 397nm excitation. Europium doped black pepper solution shows two emission peaks at 516nm and 658nm under 440nm excitation wavelength. Thin-film of pure black pepper shows an emission band around 454nm under 390nm excitation wavelength. The CIE Chromaticity Coordinates of the Black Pepper and other synthesized samples shows color co-ordinates near the blue and white region in the visible spectrum. These CIE chromaticity co-ordinates demonstrate high spectral characterization of developed materials such as high color purity and excellent chromaticity co-ordinates. The entire photoluminescence results indicated that synthesized samples have promising potential for LED applications.