Articles & Interviews

Standardization + Regulation | Jun 04, 2012
Zhaga - Insights into the New LED Lighting “Standard” for Light Engines
Zhaga - Insights into the New LED Lighting “Standard” for Light Engines Greg Galluccio, Director of LED Business Development and Product Management for Lighting and Energy Solutions at Leviton and Zhaga spokesperson, talked to Siegfried Luger and Arno Grabher- Meyer from LED professional at the Light+Building in Frankfurt about the Zhaga LED lighting “Standard”. The industry initiative, Zhaga, will fundamentally influence the lighting business because of the interchangeability of LED light engines. Read more »
Commentary | Apr 27, 2012
LED Lighting Trends in 2012: The Rise of Lighting Solutions?
LED Lighting Trends in 2012: The Rise of Lighting Solutions? LEDs have already reached a sufficient “price/performance” level to enable massive adoption in LCD display applications. General Lighting applications will be the next and largest market for LED light sources. But the fact is that General Lighting can only take off if the cost/performance of LED based products can beat incumbent technologies. In that context, many of the lighting domain actors are developing new services in order to add innovation and value to Solid State Lighting, and differentiate them from traditional technologies. Will 2012 be the rise of Lighting Solutions? Read more »
Interview | Apr 26, 2012
LED Technology – Changing the Component Business in the Area of Lighting
LED Technology – Changing the Component Business in the Area of Lighting In an interview with LED professional, Volker Neu, the General Manager of LED at Vossloh-Schwabe Optoelectronic explains the influence LED technology has on the component business in the area of lighting. Internal and external changes and alterations are necessary to be able to adjust to new technologies. Innovations and standards are especially important for moving the business of LED solutions forward. Read more »
Technology | Aug 06, 2010
LED Failure Modes and Methods for Analysis
LED Failure Modes and Methods for Analysis LED’s open the way to new applications and markets in various different fields with a broad spectrum of requirements. Beneath other beneficial characteristics, in general, LED’s provide a high reliability, and a lifetime of more than 50;000 hours can be reached. Poor workmanship in manufacturing and unfavorable operational conditions may reduce the reliability significantly. To avoid failures or to achieve fast resolutions of existing problems a good knowledge of the failure mechanisms and suitable analytical methods is required. Objective of this article is to provide an overview of state of the art techniques in LED-Failure analysis. Read more »
Technology | Aug 06, 2010
LED Source Modeling Method Evaluations
LED Source Modeling Method Evaluations Producing accurate simulations of LED based optical systems requires accurate source models. This means the source models must not only produce the correct distribution of light in a far field measurement, they must also produce the correct near field behavior since secondary LED optics are often employed in very close proximity to the LED. Accurate simulations are vital to the design process especially with lens optics commonly used on LEDs given the high cost and long lead times for lens tooling. The data presented in this paper is a direct result of the lessons learned by one manufacturer about the importance of simulation accuracy. Read more »
Technology | Dec 30, 1969
Measurement of LEDs
Measurement of LEDs Various new types of light emitting diodes (LEDs) are being developed and introduced for general illumination and other applications, and there are increasing needs for accurate measurements of various optical parameters of LEDs. Traditional standard lamps do not meet the calibration needs for LED measurements as LEDs differ substantially from traditional lamps in terms of physical sizes, flux levels, spectra, and spatial intensity distributions. Read more »
Technology | Dec 30, 1969
High Quality GaN Substrates for Modern LED Technology
High Quality GaN Substrates for Modern LED Technology It is well known that modern III-nitride based technologies for light emitting diode (LED) production include (as an initial inevitable step) the preparation of GaN templates. Such GaN templates are usually delivered on foreign substrates possessing high lattice mismatch with respect to GaN layers, e.g., sapphire or silicon carbide substrates. The growth of GaN layers on highly mismatched substrates occurs via the formation of 3D islands with their following coalescence [1]. Such growth mode results in an extremely high density of threading dislocations (TDs) up to 1010–1011 cm–2 in the layer interior [1]. These TDs are known as main sources for the deleterious performance of LEDs and other GaN based electronic and optoelectronic devices [2]. Therefore there exists an ultimate necessity in the developing of effective and low-cost recipes for low TD density GaN template manufacturing. Read more »
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