High Brightness LEDs

LEDs (light emitting diodes) are light sources based on semiconductor devices. LEDs are used for a broad range of applications, such as backlight illumination of mobile phones or displays, traffic signals with low maintenance, car head lamps and rear lights, head-up displays, projectors and general illumination. They offer a number of advantages compared to other light sources, including long lifetime, low total lifecycle costs, compact size, easy implementation into end devices, and particularly, very high efficiency. The use of LEDs for illumination can save up to 85 % in energy consumption compared to standard light sources, offering the potential to reduce about 15 % of the total worldwide energy consumption if all standard light sources were substituted.

Various types of LEDs, including narrow band emitting LEDs with wavelength spanning red to blue or broadband emitting LEDs as white light source for general illumination, are currently available. LEDs are fabricated by epitaxical growth of an optical active layer on compound semiconductor material. The wavelength of the final LED can be determined through the selection of the material and the grown layers. The total efficiency of LEDs can be dramatically increased by improving the out coupling of light from the semiconductor material as well as by enabling an efficient, uniform cooling through selection of a suitable setup.

EV Group offers a wide range of specially adapted products and technologies for the fabrication of highly efficient LEDs within its compound semiconductor solutions portfolio. EV Group provides wafer-level bonding and thin-wafer handling solutions for layer transfer of the active layer, imprint lithography for patterning the top surface, and optical lithography for wafer bumping and metal-contact processing.

Major LED manufacturers worldwide trust in EV Group´s tools for reliable high volume production.


Highly efficient LED joule module for car front lamps. Courtesy of Osram.