LED makers have different perspectives on GaN LED substrates I

<< Go Back Posted By:administrator on Apr 12,2015in Industry News

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Some LED makers have turned to GaN-on-Si LED technology over recent years to reduce manufacturing costs, since silicon substrates are cheaper compared to sapphire. Leading LED lighting manufacturers turning to alternative substrates include Soraa with its GaN-on-GaN technology, and GaN-on-Si manufacturers.

Theoretically, silicon wafers are cheaper than sapphire and projected to help manufacturers save 1 cent/mm2. Silicon have a much larger size of above 200 mm, sapphires at most measure 150 mm, while the largest GaN wafer is only 50 mm.

In addition, for every 15% lower EPI efficacy in silicon, about double EPI area is required compared to sapphire to meet the same lm/W. In reality, GaN-on-Si LEDs have a 10% performance gap, and in general a 66% higher EPI than sapphire.