Gallium Nitride and Related Wide Bandgap Materials & by R. Szweda

By R. Szweda

The moment variation of Gallium Nitride & comparable broad Bandgap fabrics and units presents an in depth perception into the worldwide advancements in GaN, SiC and different optoelectronic fabrics. This record additionally examines the implication for either providers and clients of GaN technology.

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E. a GaN LED optimized for light emission in the very short wavelengths. On the one hand, UV-LEDs seem better suited to this than the existing blue-green LED by virtue of higher light conversion efficiency. This is one of the crucial factors in the further market penetration of the white LED in the general lighting market. Phosphor technology is already available since this is in use within the c o m m o n p l a c e fluorescent discharge tube. The W-LED-based white LED would, therefore, in effect b e c o m e a solid-state equivalent of this traditional light source.

However, at the current time, only the violet laser diodes at around 400 n m are commercially available--blue and green may still be a few years away. Full-colour displays can also be achieved from two or three lasers w h o s e beams have been combined into a single beam. White-light beams are primarily used in RGB laser projectors. For some RGB laser projectors, deliberate addition of yellow light is required for specialized 4-colour projectors. A diode laser could therefore be used to provide the shorter wavelength c o m p o n e n t s in combination with a red diode laser to create a solid-state semiconductorbased laser projection system.

A c o m p o u n d annual average growth rate (CAAGR) of 23% is expected to be sustained throughout the period in value of sales, but significant shifts in production emphasis by device type and application are expected. 1. The 1998 worldwide market for wide bandgap semiconductor optoelectronics was valued at over US$292 million and will exceed US$1057 million Gallium Nitride & Related Wide Bandgap Materials & Devices 33 3 Applications Market Overview by the year 2003. 2. 5 million. 2% to exceed US$5 million by the year 2003.

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