news digest ♦ LEDs
engraving on the rear sleeve. Mechanical dimensions are 11 mm diameter x 49 mm length.
The 635, 639 and 660 nm lasers are AlInGaP based while the 830 and 852 nm modules are based on AlGaAs.
With an operating voltage of 3 - 6V DC and a broad ambient temperature operating range from -10 degrees C to +500C, the modules are also static, surge and reverse-polarity protected and RoHS compliant. Electrical connections are made via 300 mm external flying leads.
Custom lasing wavelengths, from 405 nm to 852 nm, and power options are available on request. Both standard and custom configurations provide OEMs, end-users and systems integrators with complete cost-effective laser solutions.
The Optoelectronics Company, founded in 2009 by Tony Pope and Damon Cookman, is a manufacturer of high performance custom-designed and standard laser diode modules and also an authorised distributor of innovative optoelectronic components, including Oclaro (Opnext) Laser Diodes and Panasonic Lenses, to industrial, medical, telecommunications and defence markets in the UK, Europe and USA.
Philips Lumileds pumps up LED efficacy and flux
In the high-power LUXEON Q III-nitride device, high flux and high efficacy are achieved in a standard 3535 surface-mount package
The new LUXEON Q from Philips Lumileds delivers superior performance in a high-power emitter that serves as a direct drop-in replacement for products that use the standard 3535 surface mount package.
performance Chip Scale Package (CSP) device architecture. Efficacy for the LUXEON Q emitter is 135 lm/W at 5700K 70 CRI and 115 lm/W at 3000K 80 CRI (@85˚C and 350 mA).
Kathleen Hartnett, Product Line Director for LUXEON Emitters notes, “Our LED is especially competitive when it’s driven harder. For instance, at 1 Ampere, a flux of more than 300 lm at an efficacy of 102 lm/W at 85˚C is achieved in neutral white at 4000K. The high efficacy at high drive current of the LUXEON Q emitter is achieved as a result of the industry leading wall plug and conversion efficiency of Philips Lumileds next-generation CSP architecture.”
The LUXEON Q takes advantage of a fully developed ecosystem for 3535 components, including a wide range of optics, to speed the time-to-market for omnidirectional indoor and outdoor luminaires.
Applications include high bay and low bay luminaires, downlights, outdoor wall packs, replacement lamps and specialty luminaires. “Customers are starting with a familiar LED package and can quickly build their products from there using readily available optics and other compatible components,” says Hartnett.
The LUXEON Q emitter line is available in CCTs of 2700K, 3000K, and 3500K at 80 CRI and CCTs of 4000K and 5700K at 70 CRI.
Epitaxial cascading of nitride LEDs overcomes efficiency droop
As the number of the cascaded LEDs increases, efficiency droop is greatly reduced
Researchers at the Ohio State University have experimentally demonstrated epitaxial cascading of multiple p-n junction diodes with low series resistance.
They have shown that cascading multiple LEDs circumvents nitride LED efficiency droop and reduces overall joule heating.
LUXEON Q
LUXEON Q is the first high-power LED based on LUXEON Flip Chip die, Philips Lumileds high
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www.compoundsemiconductor.net October 2013
Efficiency droop in GaN LEDs is one of the major roadblocks to widespread adoption of solid state lighting. In the last decade there has been extensive work on identifying and overcoming the nitride LED efficiency droop. But the underlying reason is still under debate and no designs have been completely successful in solving the problem. It is possible that material limitations of III-nitride material system may preclude complete elimination in traditional single active region LED structures.
Cascading multiple LEDs pushes the input power of the peak efficiency to higher values by exploiting each
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