Indium phosphide (InP)-based quantum dots (QDs) are widely studied as environmentally friendly light emitters for display applications. However, the synthesis of InP QDs with optical properties that meet high color quality as comparable with cadmium (Cd)- and lead (Pb)-based QDs is challenging. In this article, we present the synthesis of surface-modified bright green luminescence InP core–shell quantum dots (CS-QDs) with the narrowest full width at half-maximum (fwhm) of 33 nm, absolute quantum yield (QY) of 71%, and an absorption spectra valley/depth (V/D) ratio of 0.61 after a size selection purification process. Our approach first emphasizes the heating temperatures for InP growth and second on the importance of surface stabilization of this system. We developed a two-step heating-up process to grow In­(Zn)P core and coated inorganic shell with ZnSe/ZnSeS/ZnS composition. In situ surface treatment with zinc chloride (ZnCl2) and 1-octanol was carried out to enhance the PLQY and improve the surface passivation of the CS-QDs. Optical spectroscopy and surface characterization techniques including nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and infrared (IR) spectroscopy were used to analyze the properties of the CS-QDs. We suggest that this work motivates future development and optimization of surface chemistry of InP CS-QDs to enable the full access and realization of their luminescence efficiency in high-color-quality cadmium (Cd)-free displays.

Five water samples each were collected from six shallow wells which serve as source of drinking water at different locations within the Anloga community of the Volta Region in Ghana. Samples were analyzed for physicochemical characteristics, and human health risk associated with the consumption of heavy metals in the samples was also assessed. The results showed that pH, EC, water hardness, fluoride and sulfate levels were below the maximum permissible levels recommended by the WHO for drinking but chloride and nitrate levels in well A 6 were above their respective WHO limits. Concentration of heavy metals showed Cd and Pd toxicities in some of the wells since their concentrations were higher than the WHO accepted limit for drinking water. Estimated non-carcinogenic health risks of the metals through ingestion were less than 1 in some of the wells, indicating small to no health hazard; however, high non-carcinogenic risk was recorded in well 2, 3 and 5 indicating a potential health hazard to the local residents. Health risk through dermal injection of the metals was found to be less than 1, indicating no health risk associated with water samples via dermal absorption. Cancer risk computed for Cd ranged from 1.82E−02 in well A 5 to 9.09E−02 in well A 1 and A 6 , indicating that consumption of water from these wells could result in an excess of 2-9 cancer cases per 100 people. The risk of developing cancer from Pb as a result of consuming water from wells A 1 , A 2 and A 5 was estimated to be 3.69E−06.

We report high-performance 0D−2D hybrid photodetectors integrated with tunable band gap perovskite (CsPbI 3 , Cs X FA X−1 PbI 3 , and FAPbI 3 ) quantum dots and MOCVD-grown bilayer MoS 2 . In our hybrid structure, the lead halide PQDs can be utilized as an absorbing layer of light of specific wavelengths and transfer the photogenerated carriers to the MoS 2 transport layer. With tunable wavelength lead halide PQDs, the 0D− 2D hybrid photodetector shows a high responsivity up to 10 7 AW −1 and high specific detectivity exceeding 10 13 Jones due to the difference in the built-in potential between PQDs and multilayer MoS 2 layers. This work proposes the possibility of fabricating highperformance photodetectors by hybridizing PQDs of various band gaps with 2D materials.