Structural and photoluminescence properties of green synthesized ZnO nanoparticles from Calotropis gigantea leaves

Abstract

This study explores the properties of ZnO nanoparticles produced using a green method involving Calotropis gigantea leaves. The nanoparticles were created by extracting materials from the plant leaves and then subjected to annealing at 350 °C in an air environment for crystallization. X-ray diffraction results represent the formation of pure hexagonal ZnO with an average crystallite size of 48–51 nm. Fourier Transform Infrared spectroscopy also confirms the synthesis of hexagonal ZnO NP as evident from a sharp band observed at 524.55 cm−1 in IR spectra. Energy dispersive X-ray spectroscopy results reveal nucleation of pure ZnO. Photoluminescence emission results revealed that PL bands observed at wavelengths of 399.93 nm and 469 nm in the near UV to violet and blue regions, respectively, demonstrating their potential applications in optoelectronics. Color chromaticity coordinates diagram reveal that color coordinates presence in the blue region. This demonstrate that synthesized ZnO has high purity and hold promise materials using for blue LED and also use as biomaterials with antibacterial properties. Additionally, a detailed exploration of mechanisms is discussed.