In the past we have extensively studied I-III-VI2 nanocrystals. These materials are an unusual semiconductor with similarities as well as differences from the II-VI family of materials. Our observation of a new physical effect, temporal evolution of radiative rate in these materials is reported in (Nano Fut. 2018). The observation of an allied effect enabled us to generate materials where spontaneous emission lifetimes could be generated on demand (J.  Chem. Phys. 2021). We further extensively characterized defects in these materials (J. Am. Chem. Soc. 2016) as well as plasmonic characteristics of some of these materials (J. Phys. Chem. Lett. 2018) . We also used these materials as IR photodetectors (Adv. Mat. Interf. 2020) , catalysts (ACS Energy Lett. 2018) as well as for transparent wide area lighting and displays (J. Phys. Chem. Lett. 2018). We developed theoretical tools to understand the peculiar electronic structure of I-III-VI2 nanocrystals. Our understanding of the electronic structure of these materials is summarized in (J. Phys. Chem. C 2021),( J. Phys. Chem. C. 2022)