Employing a well-optically managed material is always attractive to reach a high-performance photovoltaic device. Carbon dots (CDs) are a fabulous name with a set of optical features (such as benign nature, extremely low-cost preparation method, tunable band-structure and high emission efficiency) suitable for fabrication of luminescent solar concentrators (LSCs). However, as a prerequisite for any photovoltaic system, they should be able to extendedly harvest the incident sunlight. The presented study, focuses on initial formation of bi-metallic MgAl structure via hydrothermal method, followed by facile microwave heating in the presence of ortho-phenylenediamine (OPD). The effect of different amounts of OPD (0 - 0.6 g) was investigated, which confirmed the determinative role of OPD in fabrication of a luminescent composite with enhanced crystallinity. They showed a relatively wide absorption area starting from 525 nm, with excitation-independent bright orange emission spectra located at around 575 nm when dispersed in water. Interestingly, they were yellowish green in ethanol, with brighter emission. In both cases, composites showed relatively broad FWHM of 90-100 nm and extended absorption, suggesting them as fine candidate for fabrication of luminescent solar concentrators and for bioimaging applications.
