LEDs ♦ news digest


primarily by companies seeking access to new markets and local distribution networks.


The number of mergers and acquisitions deals is likely to continue to grow as LED technology has created a Solid State Lighting (SSL) chasm, modifying all traditional aspects of the lighting industry (light source, system design, test...) and forcing supply chain players to acquire new competencies.


Emerging substrates could change the rules in an industry dominated by sapphire


Sapphire (and SIC) remain the most widely used substrates for GaN epitaxy but many research teams are working on finding better alternatives in terms of performance and total cost of ownership. In that context, silicon and GaN are the main new substrates developed in the LED industry:


Benefits of GaN-on-silicon LEDs rely on decreasing manufacturing cost by using cheaper silicon substrates but mainly by switching to an 8Ӭ substrate and using fully depreciated and highly automated CMOS fabs.


Benefits of GaN-on-GaN LEDs stem from the lower defect density in the epitaxial layers, allowing the device to be driven at higher current levels and to use a lower number of LED devices per system.


However, several barriers need to be overcome:


• GaN-on-silicon LEDs are closer to GaN- on-sapphire LED performance but increased manufacturing yields and full compatibility with CMOS fab still need to be achieved.


• GaN-on-GaN LEDs suffer from GaN substrate availability and its cost.


While GaN (GaN-on-GaN LEDs) holds some potential on specific high-end niches, Yole considers silicon (GaN- on-silicon LEDs) as the more serious contender as a potential alternative to the widespread use of sapphire. But the success of GaN-on-silicon LEDs will depend on the development of associated LEDs performance and development of manufacturing techniques.


Optoelectronics Company reveals compact III-V laser diode modules


The miniature devices are composed of Oclaro’s Opbext aluminium indium gallium phosphide (AlInGaP) and aluminium gallium arsenide (AlGaAs) laser diodes with


Tiny laser diode modules


This new range of laser diode modules combines a high performance Oclaro (Opnext) laser diode with externally adjustable optics, a Panasonic aspherical glass lens, sophisticated electronics and rugged modular anodised aluminium housing . It provides a reliable, energy- efficient and precise laser source for OEMs, end-users and systems integrators. A key feature is the brass lens holder which enables smoother, more accurate focussing by using a finer pitched thread.


“As applications get more sophisticated and devices get smaller, these laser modules are a perfect solution for OEMs to design in where space is at a premium”, comments Tony Pope, Managing Director, the Optoelectronics Company. “Combining high performance with energy efficiency, they require less power, generate less heat, have longer lifetimes and fit into smaller spaces than other laser sources” he adds.


The CW lasers produce a high-quality elliptical beam at 5 visible and infrared lasing wavelengths, (635 nm, 639 nm, 660 nm, 830 nm and 852 nm), and offer a combination of low noise and output stability with powers of up to 75 mW. For easy identification they can be supplied with coloured end caps or customer specified


October 2013 www.compoundsemiconductor.net 69


externally adjustable optics. They also incorporate a Panasonic aspherical glass lens in rugged modular anodised aluminium housing


The Optoelectronics Company, a manufacturer of innovative optoelectronic components and distributor of Oclaro (Opnext) laser diodes and Panasonic glass lenses, has launched another innovative and cost- effective range of laser diode modules.


The devices are optimised for compact integration into OEM applications where size is critical.


With a diameter of only 11 mm, the modules are ergonomically designed with a small form factor for integration into a wide range of applications. These include industrial and medical alignment, low level laser therapy, inspection and sensing where a tiny package is essential to fit into very compact spaces.


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