InfiniLED’s latest MicroLEDs (μLEDs) have produced record optical beam intensity. This new device is capable of producing up to 1mW of light from a single 20μm pixel at 405nm. This is equivalent to a light output density of more than 300 W/cm2 — the high cm2 est recorded for a commercially available LED type device.

A cluster of 25 MicroLEDs beside the tip of a needle. The parabolic reflector shape can be seen in the inset close-up.
The MicroLED combines the benefits of a laser and a LED to produce ultra-high light output. The MicroLED provides the wavelength flexibility, drive characteristics and simplicity of a LED as well as the power and collimated beam of a laser. The ability to produce such light intensity and control directly from the chip enables the light to be efficiently used in a range of applications.

InfiniLED achieved this record performance using the patented MicroLED structure, which was invented by a team of researchers led by Mr. Brian Corbett at Tyndall National Institute. A parabolic reflector is etched into the semiconductor material during the fabrication process, which places an optical component directly at the site of light generation and at the most effective position for control of the light produced. Not only has the light been shown to be extracted in ultra-high intensity but also at high efficiencies. By directing all the generated light through a single surface of the semiconductor it can be efficiently collected and used in the wider system.

The MicroLED can be used in a wide range of applications including life sciences, consumer electronics and OEM equipment. The MicroLED (μLED) can be fabricated as a single pixel, large clusters of pixels, or as addressable arrays where each pixel is individually switchable. The single pixels can be used to produce high intensity, collimated light over a small area, or to produce useable light at ultra-low currents. The single pixels produce light with a few nanoamps of current. To produce larger amounts of light, clusters of tightly packed MicroLEDs can be used. This results in high light density and collimated emission over a wider area. MicroLEDs (μLEDs) are also available as addressable arrays of pixels. The collimation from each pixel results in high packing densities and minimal crosstalk between the devices.

Additionally, the high current densities achievable and low capacitance allows the MicroLEDs to be switched at very high speeds. Experimental work is currently ongoing with the Tyndall National Institute and the results will be announced when available.

For more information, contact Bill Henry at This email address is being protected from spambots. You need JavaScript enabled to view it.


Lighting Technology Magazine

This article first appeared in the March, 2013 issue of Lighting Technology Magazine.

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