The industrial pollutants in water bodies tend to unsuitable for living organisms and irrigation uses. Water contamination is exaggerating at regular pace and the universe is holding carcinogenic agents. Therefore, there is a necessity of immediate action to generate a potential and efficient technology for water management. By means of this, quantum dots (QDs) have emerged as an effective probe for the removal process. This review discusses the methods for removing and degrading the coloured components, pesticides, pathogens from waste water and contaminants removal ability of QDs.

The main objective of this research is to present the impact of several doping and geometrical parameters on the performance of the GaN/AlGaN quantum dot-based light-emitting diode by employing numerical 3D simulations. The sensitivity coefficients of the parameters have been utilised to rank them. Four significant performance parameters were used in this research, such as, responsivity optical gain, internal quantum efficiency, and input power. The quantum dot’s bottom radius is observed to be the most relevant geometrical parameter for optical gain and internal quantum efficiency. Furthermore, the nanocolumn radius is the most important parameter for quantum dot responsivity and input power. The Nanocolumn radius is found to be the most critical parameter, based on the overall ranking.