A novel COB structure with integrated multifunction

A novel COB（chip-on-board） structure with integrated multifunction is presented.The structure is prepared by laminating copper plate with FR4 board and then coating with a silver layer to offer high reflectivity and high conductivity.In comparison with MCPCB（aluminum） and ceramics（Al2O3） board,the substrate brings about 10%higher light extracting efficiency than aluminum board and 5%higher flux maintenance ratio than ceramics（Al2O3） board at 3000 h.With integrated multifunction,through an IC component driving high voltage serial LED chips,the COB can be directly connected to AC 110 V or 220 V power supply in lighting application.