LEDs ♦ news digest
higher than comparable LEDs in its class at 70 -100 Mcd/m² (million candelas per square metre).
Oslon Black Flat LED
Osram says its latest product offers high light output even at high currents, uniform distribution of light, thermal stability and particularly good contrast for seeing and being seen.
The Oslon Black Flat LED had its premier as a prototype at ISAL 2011 and is available now.
Light sources for front lighting have to be multitalented. Not only do they have to illuminate the road ahead reliably in rain and fog and at night, they have to perform various functions as low beam, cornering lights and fog lights for example.
They also have to withstand high temperatures in the headlights. For these reasons more and more automobile manufacturers are opting for flexible, efficient and powerful LED technology.
With a high luminous flux even at high temperatures, the new LED contains a UX:3 chip that delivers high light output at high currents.
Osram says thermal management is much simpler with this new LED. This is thanks to the greater thermal stability of the luminous flux even under “hot” application conditions and also to a new temperature-optimised packaging process. This has meant that the typical thermal resistance has been reduced to 4 K/W.
The thermal coefficient of expansion of the black QFN package (Quad Flat No Leads) of the Oslon Black Flat LED is matched to the coefficient of expansion of the metal core board.
The Oslon Black Flat was developed in Regensburg and having been designed to function without a lens, its light can be injected very close to light guides or lenses. Osram says that its luminance, in other words what the human eye perceives as the brightness of a particular surface, is 2 to 5 times
“This is particularly important in automotive frontlighting solutions based on projection systems”, points out Peter Knittl, Director Automotive LED at Osram Opto Semiconductors. “The greater the luminance of the LED, the smaller the external lens and the smaller the space needed. Headlights can therefore be made much more compact, giving designers much more freedom.”
Encapsulation of the chips directly in the package produces a defined light/dark boundary in the light pattern and, in conjunction with advanced package technology and the ceramic converter, a uniform distribution of light and particularly good contrast ratio on the road.
The benefits of Oslon Black Flat, above all its low thermal resistance and impressive performance under extreme conditions, have really struck a chord in the industry. Before the end of 2012 we will be seeing automobiles and motorcycles on the roads in which these small black LEDs will be performing the most important frontlighting functions”, adds Knittl.
The LED measures 3.75 x 3.75 mm² and has a luminous flux of typically 200 lm at 700 mA at a Tj of 25°C and 270 lm at 1.2 A at a Tj of 100°C.
The luminous efficacy is 87 lm/W and the luminance is 70 - 100 Mcd/m² (millions candelas per square metre). Electrical thermal resistance is 4 K/W.
Lifetime as a function of the solder point temperature (Ts) of the L70B50 is 100,000 hours at 700 mA, at a Ts of 60° C and 10,000 hours at 1.2 A and a Ts of 120° C.
Oxford sells 400th plasma tool for HBLEDs
The firm says it has a multi-tool order from China’s largest HBLED manufacturer
Oxford Instruments has sold its 400th plasma system to a Chinese HBLED supplier.
October 2012
www.compoundsemiconductor.net 65
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