SAN JOSE, Calif. - Japan's Sumitomo Electric Industries Ltd. claims that it has developed the world’s first 6-inch diameter gallium nitride (GaN) substrates to be used for white LEDs.
The white LED market has been growing using 2- to 4-inch sapphire substrates. As an alternative to sapphire, Sumitomo Electric began production of 2-inch diameter GaN substrates designed for use in white LEDs.
''These materials allow for better thermal dispersion and other superior properties which will enable LED manufacturers to reduce chip sizes and increase output power,'' according to the firm. ''The company also believes GaN substrates will be used for power devices because of the excellent thermal conductivity, electric responsiveness and breakdown voltage of devices made using these materials.''
Sumitomo Electric also has been in production of 2-inch diameter GaN substrates for blue-violet lasers. These GaN substrates enabled production of the first Blu-ray DVD players.
Sumitomo recently announced it is expanding its saw wire business with the establishment of a wholly-owned subsidiary in Taiwan. The proposed company is called Taiwan Sumiden Steel Wire Co. Ltd. Saw wire is an essential material needed for solar cell production.