南大光电：主要从事先进前驱体、电子特气、光刻胶及配套材料等三类关键半导体材料的研发、生产和销售

Core Viewpoint - Nanda Optoelectronics focuses on the research, production, and sales of three key semiconductor materials: advanced precursors, electronic specialty gases, and photoresists along with supporting materials [2] Group 1: Company Overview - The company primarily engages in the development and production of advanced precursors, electronic specialty gases, and photoresists [2] - The electronic specialty gas segment includes hydrogen-based electronic specialty gas products such as phosphine, arsine, and safety sources, as well as fluorine-containing electronic specialty gas products like nitrogen trifluoride and sulfur hexafluoride [2]