An Aussie firm claims that they have grown GaN on a 6 inch (152 mm) glass substrate. Both are big ticket news items as 6 inch substrates can cut cost significantly (as opposed to the 2 inch substrates in vogue now). Further Glass is bound to be cheaper than the sapphire that is currently used to grow GaN epitaxially. While SiO2 is also used it is basically only cree who is onto this technology. From LED Mag:
BluGlass Ltd of Sydney, Australia says it has succeeded in producing what it claims is the world’s first blue light emission from the uniform deposition of gallium nitride on a 6-inch diameter coated glass wafer.
The latest increase in scale offers the LED market the possibility of additional cost efficiencies, claims CEO David Jordan. Compared to current 2-inch industry-standard sapphire or silicon carbide substrates for commercial blue LED production, a 6-inch wafer has nine times the area.
The company is also developing a remote plasma CVD process for low-temperature deposition of GaN.