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142 TECHNOLOGY / LED


strip of light.The new LEDs are offered in a broad range of colour temperatures ranging from 3000K to 6500K. At 5000K the LEDs feature a CRI of 72 and deliver efficacy of 110lm/W.


PHILIPS LUMILEDS: Announced a royal-blue LED specifically for remote-phosphor SSL applications, and also launched the Luxeon A illumination-grade LED that’s part of the Freedom From Binning program. The new Philips Luxeon ES royal-blue LED delivers wall plug efficiency (also called overall luminous efficiency) of 56% at 350mA for remote-phosphor-based solid-state-lighting (SSL) designs. For LED lamp and luminaire designs that use white LEDs, Philips an- nounced the Luxeon A LED (shown in figure 7) that measures 2sqmm and is also part of the company’s Freedom From Binning program. The Luxeon A LED comes in 2700K and 3000K colour temperatures and all Luxeon A emitters fall within a single 3-step MacAdam ellipse on the black body curve. The Luxeon A is the first single emitter that is part of the company’s Freedom From Bin- ning program.


tion in lumens output at 100C thus providing superior operational performance. The first product utilising this new technology will be the Z5P with CCTs between 2600K and 7000K and up to a maximum lumen output of 140 lumens with a datasheet figure of up to 133 lumens at 100C junction tempera- ture. The Z5P has a low thermal resistance (6C/W) with a maximum junction tempera- ture of 145C at a forward current 1000mA.


JULY 2011 XICATO: Increased XSM Artist Series Efficacy by over 45%. Xicato’s second generation XSM 700lm Artist Series module yields an ef- ficacy of 48lm/W, approaching the efficacy of compact fluorescent lamps. With such an increase Xicato will soon surpass a bench- mark lamp-source lumen per watt threshold of 50 lumen per watt, and without any compromise in light quality compared to conventional halogen.


Xicato announces the addition of a 1000lm Artist Series module with increased applica- tions: higher mounting heights, suitability for both accent and ambient applications and greater accent factors. The new mod- ule power consumption is rated at 22.1W (700mA), yielding an efficacy of 45lm/W.


Figure 8: The new SSC ZP5 performance at high junction temperatures.


Figure 7: The Luxeon A white LED.


CREE: Reported a new record efficacy for a white LED which was measured at 231 lumens per watt using a single-die compo- nent at a correlated colour temperature of 4500K. The results were made at standard room temperatures and 350mA testing and the R&D results feature advanced aspects of the same technology used in current production white LEDs.


JUNE 2011 SEOUL SEMICONDUCTOR: Introduced the Z5P with a new LED chip technology that prom- ises to deliver significant improvements in the lumen output of LEDs at high operating temperatures. Most lumen output figures on LED datasheets are measured at 25C but actual chip operating temperatures are usually far higher. It is generally accepted light losses at a junction temperature of 100C have been between 8 and 17% mean- ing that an LED quoted at 100 lumens will only deliver between 83–92 lumens during normal operation. The new SSC innovation in technology results in only a 2–5% reduc-


OSRAM: Announced record breaking OLED efficacy by research and developers that have achieved 87lm/W in a product that closely resembles production OLED units. The breakthrough shown in figure 9 should pave the way for the potential accelera- tion of OLED adoption. This means that OLEDs are almost achieving the efficiency of fluorescent lamps in the laboratory. The measurements were performed under appli- cation-oriented conditions in an integrating sphere without macro extractors, i.e. lenses to optimise the measurement results. Measurements were taken at a brightness of 1,000cd/m2 and a colour temperature of approximately 4,000K. A further suc- cess for the OSRAM research team was the laboratory sample achieved almost 75Im/W at a brightness of 5,000cd/m2. The organic functional material employed was already tested in pilot manufacturing and enables product-relevant lifetimes. The OLED labo- ratory sample was prepared using a pure thin-film approach. The current was distrib- uted evenly over the active surface using a special injection electrode on the light-gen- erating surface and offers homogenous light density from every angle.


AUGUST 2011 BRIDGELUX: Announced that it has shattered its previous industry record for highest lm/W values for Gallium Nitride on Silicon (GaN-on-Si). Using its proprietary buffer layer technology, the company has dem- onstrated growth of crack-free GaN layers on 8-inch silicon wafers, without bowing at room temperature, extending the compa- ny’s lead in driving the performance and manufacturability of GaN LEDs on silicon substrate.


Bridgelux demonstrated LED performance levels comparable to state-of-the-art sap- phire-based LEDs. Cool white LEDs showed efficiencies as high as 160lm/W at a CCT of 4350K. Warm white LEDs constructed from the GaN on Si chips delivered 125lm/W at a colour temperature of 2940K and CRI of 80. SEOUL SEMICONDUCTOR: Launched the Z7-F a high-power, high-brightness full-colour LED featuring high brightness lumen per watt performance (R: 75lm/W, G: 88lm/W, B: 15lm/W, W: 97lm/W). The lens-type package shown in figure 10 delivers more light and is provided in an ultra-small pack- age (9x7x3.2mm).


Figure 10: The Z7-F high power LED from Seoul Semiconductor.


Figure 9: The record breaking OLED prototypes from OSRAM.


CREE: Announced commercial availability of a new XLamp XT-E Royal Blue LED opti- mised for use in remote-phosphor lighting. Built using Cree’s proven Direct Attach LED


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