The Opto-semiconductors are used in lighting, medical and food sanitization applications. The company says that it has completely packaged Opto-Semiconductors in both HTCC and COBs. Both, HTCC (High Temperature Co-fired Ceramic substrates) and COB (Chip on Board) all are wholly conceived, designed and developed by Polymatech and these are closed Tools.

from Times of India https://timesofindia.indiatimes.com/auto/cars/first-made-in-india-semiconductors-roll-out-from-polymatech-plant-in-tamil-nadu/articleshow/94804005.cms