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TECHNOLOGY / LED
many of the issues including dimming with earlier products making the technology much more efficient and useful in real applications. The A4 is very compact in size with a footprint of 7mm x 7mm x 3mm. The warm white version of the A4 has a typical CRI of 85 at a CCT of 3000K with a typical 50 lumen output at a power of 0.76W providing 66lm/W efficacy. In addition, Seoul Semi launches the A6, a 1W and the A7 a 4W Acriche emitter both in a small footprint compared to the previous generation of 1W and 4W emitters. The A6 and A7 will use the new production process that enables the die to be reduced down so the A7, at 8x8 mm, offers space-saving versatility over current 18x12mm Acriche products.
Philips Lumileds: announces it is entering the AC LEDs world with the launch of the Luxeon Rebel AC which will be in full production by the end of 2010. This is a radical departure for Lumileds who created the original high power DC LED die that has revolutionised LED lighting. However, a key advantage of the new AC LED is that it is in the same Rebel form factor and package architecture ensuring the thermal management is of high quality. Philips Lumileds states that it has an advantage over its main AC LED competitors because of the die architecture it uses as shown in figure 4. The Rebel AC uses one large die which is in a flip chip format
so there are no bond wires required and is directly mounted on a ceramic/silicon submount rather than a sapphire substrate thus improving performance.
Philips Lumileds also announce the new Rebel ES range available initially in Cool and Neutral White CCT’s with a minimum lumens per watt efficacy of 120lm/W producing 120 lumens at 350mA and 108 lm/W with 225 lumens at 700mA. The interesting aspects of the new ES range is it has a much lower forward voltage than most white LEDs and the typical voltage at 350mA was 2.85V rather than the 3.15V. At launch time the efficacy has increased to 125lm/W for Neutral and 130lm/W for Cool white LEDs.
Philips Lumileds also announce the new Rebel ES range available initially in Cool and Neutral White CCT’s with a minimum lumens per watt efficacy of 120 lm/W producing 120 lumens at 350mA and 108 lm/W with 225 lumens at 700mA. The interesting aspects of the new ES range was it has a much lower forward voltage than most white LEDs and the typical voltage at 350mA was 2.85V rather than 3.15V. At launch time the efficacy has increased to 125lm/W for Neutral and 130lm/W for cool white LEDs.
Sharp: supplements its LED lighting portfolio with three new white ‘high colour rendering’, high-performance LED additions. The high colour rendering LEDs reach the high CRI value of 85 through the combination of blue LEDs with a special blend of green and red phosphorous to deliver of up to 54 lumens in a 0.8W package. The SMD LEDs from the new GM2BBxxBM0C series ensure high colour fastness with typical applications for high colour rendering LEDs including photography, retail lighting and in medical applications.
Figure 4: The Rebel AC LED advantage
As different applications also require different lighting concepts, the ‘DoubleDome’ series is available in three different Colour Temperatures, starting with ‘Warm White’ at 3000K, and ‘Natural White’ with 4000K to ‘Pure White’ with 5000K. In combination with the high CRI values, the new LEDs from Sharp are approximately equivalent to conventional fluorescent tubes with regard to their efficiency, colour temperature and colour rendering index (CRI). Sharp’s ‘Double Dome’ LEDs, are compact in a package only 2.8 x 2.8 x 1.9mm in size. With such a high CRI the 3000K LED provides approximately 58 lumens per watt, the 4000K approximately 60 lm/W and the 5000K approximately 64 lm/W.
Figure 5: The Everlight 3W Shuen LED Verbatim & Mitsubishi Chemical: announce
the development of a new generation of LEDs, planned for 2011, that utilises a violet light emitting chip with red, green and blue phosphors. These products, also in warm white, will offer further improvements in CRI with a typical average value of 98 providing an industry leading figure. A further advantage of using a violet LED with 3-part phosphor is the lighting fixtures can be made colour tunable with a high CRI from 2700K to 5500K without significant loss of lumens per watt across the colour temperature range. Interestingly, violet LEDs with multipart phosphors do not require binning because the output is not dependant upon the wavelength variations of the LED as found with standard Blue LEDs with yellow YAG phosphors. Providing these new violet based LEDs come to market with efficacies between 60lm/W and 70lm/W in 2011, they could provide a compelling offer although violet LEDs have never managed to break through into the marketplace.
Verbatim also announce it will launch an OLED offering in 2011 based on a solid-state semiconductor device composed of ultra thin films of organic molecules that create light. Mitsubishi Chemical Corporation (MCC) decide to use the unique qualities of OLEDs, integrating them into printable hole injecting material (HIM) with newly researched light emitting technology. This allows the mass production of the world’s largest class of OLED lighting area, about 14cm square.
Lighting fixtures based upon MCC OLED technology will offer high quality colour lighting with dimming and full colour tuning capabilities. Verbatim demonstrate a variety of quality OLED products at Light+Building as shown in figure 6 with impressive features such as the size and colour consistency of the panels. Verbatim have partnered with another leading Japanese brand, Pioneer, on OLED
Figure 6: The new OLED lighting panels from Verbatim
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