Pr Francis P. DAWSON , Associate Professor, Université de Toronto (Canada)

Session : Structure of LED products

Contribution:Design Considerations for Solid State Light Source Drivers

 


Light emitting diodes (LEDs) are attractive light sources due to their high efficiency, long life time and low maintenance requirements. One of the main obstacles facing the LED as a light source is the degradation of its optical output with increasing junction temperature and hence a reduction in the lifetime of the device. The junction temperature also affects the wavelength produced by the LED and therefore influences the perceived light colour. The temperature increase is due to the conduction losses in the LED and the technology employed for extracting the generated heat from the LED wafer. This presentation will discuss first the effect of input current waveforms on the performance of the LED. This will be followed by a review of LED drivers that have been suggested in the literature along with the main challenges which are faced when designing LED drivers. One of the most important applications of the LED as a lighting source is in the area of architectural lighting. This is due to the LED’s capability to produce real time color and intensity changes. The final part of the presentation will discuss the principles of the dynamic lighting for LEDs.
 

Matthias SABATHIL, He was born in Hamburg, Germany, in 1974.

He received the Ph.D. degree in physics from the Technical University of Munich, Munich,Germany.

Since 2004, he has been with OSRAM Opto Semiconductors GmbH, Regensburg, Germany, focusing on the modeling of device properties as well as the internal quantum efficiency of high-performance InGaN LEDs.

Since 2009 he is heading the modelling group at OSRAM OS.

Georges HADZIIOANNOU, Until 2008, he was professor at the University of Strasbourg (France), where he directed the Engineering School of Chemistry, Polymers and Materials and the “Laboratoire d’Ingénierie des Polymères pour les Hautes Technologies”.

His research area covers semi-conducting polymers, nanostructured polymer materials, polymer materials for information storage and plastic electronics.

He received his Doctorate in Physical Sciences from the University Louis Pasteur from Strasbourg in 1980. After a two-year post-doc at the University of Massachusetts, he became research staff member and group leader of IBM Almaden Research Laboratory until 1989. In California, he was also Industrial Research Fellow of National Institute for Science and Technology and consulting professor at the Department of Chemical Engineering at Stanford University.

Until 2001 he was Professor at the University of Groningen (Netherlands), where he directed the Materials Science Center.

In 1993 he was elected fellow of the American Physical Society, in 1998 he received the Humboldt Research Award and in 2007 he received the Süe Award from the French Chemistry Association.

He also co-founded two start-ups in Groningen (NL), “Polymer Service Center” and “Papyron” for developing innovative technology for electronic paper.

Marc TERNISIEN Marc Ternisien was born the 11th of February 1980 in Boulogne Sur Mer (France). He’s got a Master Degree in Lasers, Metrology and Telecommunications from the University of Paris XIII and the Conservatoire National des Arts et Métiers.

He defended his PhD thesis in Micro and Nanotechnology in 2008 at the University of Lille I. In September 2009, he joined the Toulouse Paul Sabatier University as an Associate Professor in the “Lumiére et Matière” team lead by the Professor Georges Zissis.

After his PhD thesis concerning the influence of Self Assembled Monolayers on the interface between the gate dielectric and the organic semi-conductor in Organic Field Effect Transistors, he’s now interested in the interface problems in Organic Light Emitting Diodes and their influence on the performance of these devices.

Mrs Emilie VIASNOFF,  Display Lab Manager at CEA - LETI (France)

Session: Oled technology

Contribution:OLED technology: what are the challenges?

It is now widely admitted that OLED is a competitive technology for display and lighting applications. Still there are a lot of challenges to reach a mature and low-cost process. Industrials have already started to invest in OLED production lines for display and lighting. A review of these technologies will be presented highlighting recent breakthroughs, along with a review of existing products. The end of this presentation will focus on perspectives in terms of market, products and technologies.

 Mr Jean-Pierre LAURET, Ingénieur R&D Optique, Gaggione (France)

Session : Structure of LED products

Contribution: Design of a collimator for high power LEDs 

High power LEDs offer unique advantages such as efficiency or lifetime, and they can be used in numerous applications that are unreachable with regular LEDs. However a high power LED does not provide its full potential when it is used “as is”. A dedicated optical system – also known as collimator – must be used with the high power LED in order to handle the output light. The goal of this presentation is to explain how a collimator for high power LEDs works, how it should be designed and what performances are reachable. Be aware that a collimator cannot do everything ! This presentation will also explain what the physical limits are when designing a collimator.

Mrs Stephanie MITTELHAM, Managing director, CELMA (Belgium)

Session : Economic aspects of LED market

Contribution: Efforts of the European lighting Industry to deliver high quality energy efficient LED lighting solutions

 The CELMA / ELC presentation will explain the activities of the European Lighting Industry, represented by ELC (Lightsources) and by CELMA (Luminaires and their components), to deliver high quality energy efficient LED lighting solutions. The main focus of the European Lighting industry is to assure that LED lighting in Europe brings an improvement of the Lighting Quality as well as a further increase of the Energy Efficiency of the lighting system.

Bruno DUSSET VIDALET is the founder of Astron FIAMM.

Creator of the brand BLACKBODY.

A graduate of ISEP (an engineering school specialized in Electronics & Computer Science) and from HEC in Marketing and Business development, Bruno Dussert-Vidalet has followed an international career path and benefits from strong experience in Innovation Management, Business and Industrial Development.

From 1995 to 1998, he worked for Alcatel IRS to create software dedicated to air defense.

Then, from 1998 to 2002, he joined the Multimedia Department at Siemens VDO, to contribute to the rollout of new technologies such as auto radios, navigation devices and on-board phones.

From 2002 to 2007, he reinforced his industrial expertise within the FIAMM, in Italy, by diversifying the group’s activities and participating to its business development.

In 2007, supported by FIAMM he stepped into the OLED business by creating Astron FIAMM and its brand BLACKBODY.