High powered LED arrays

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applies innovative LED (Light Emitting Diode) technology to industrial and scientific applications. High intensity LED light sources and associated products have been developed for the UV Curing and many other applications providing practical benefits over conventional light sources including arc / flash / xenon / mercury vapour types.

's product portfolio has been developed from long-standing collaborative research and development coupled with advanced manufacturing capabilities in niche micro-electronic applications.

This site will give you an insight into the technologies, the products, their benefits and applications. It is hoped you visit on a regular basis as new products/ technologies are unveiled.

Light Emitting Diodes / LED / LED's are semiconductor devices that emit light with a specific wavelength when an electric current is passed through them. As with all semiconductors, the technology associated with production has rapidly improved in recent years, resulting in products that emit much brighter ( high intensity ) light and are available over a much broader wavelength. LED's are beginning to replace conventional light bulbs in many illumination applications

The majority of LED / LED's are supplied with the bare LED die mounted in either a conventional through hole package style or as a surface mount / SMT device which are then moulded into a clear plastic package. This limits how closely they can be packaged together. For example, with a 3mm diameter part, it is only possible to fit nine in a 1cm squared area. However, the bare semiconductor ( Die ) is very small, ranging from 0.3mm x 0.3mm to 1.0mm x 1.0mm and this enables up to 200 LED die to be assembled into the same area and thus giving a much higher flux light output for the same area.

LED's are around three to four times more light efficient than conventional bulb technology with 15-20% of the applied electrical energy being converted into light. What this also means is that the remaining 80-85% is converted into heat. Increasing the packing density of the LED's increases the heat intensity generated and complicates the thermal management system required to keep the LED's at a constant temperature or cool. If LED's are allowed to get hot both their light intensity and life are significantly shortened.

Through a combination of innovative substrate design coupled with forced cooling using such methods as water / peltier / forced air COOLLED's engineers have designed a range of products where the LED's are thermally managed and hence controlling the light output and life of the LED die.

By use of the COOLLED technology it is also possible to produce high intensity LED light sources by over driving the LED die beyond their normal limits. This is only possible because the LED is kept at a constant controlled temperature. Having densely packed LEDs with complex cooling systems is not enough to be able to create a high intensity light source, due to fact that the LED die emits light from all of its sides but only the light from the front of the die is usable. Using conventional die attach methods this packaging style causes light emitted from the side of one die to be absorbed by its adjacent die as heat increasing the thermal management problem.


COOLLED TECHNOLOGY	LED on SUBSTRATE TECHNOLOGY

Following a two-year research program, a method of creating micro reflectors that also act as heat spreaders has been developed. This patented technology is the basis for COOLLED.

Using this method, all of the side emitted light is projected forward by these reflectors and thus has the effect of producing not only an increased light flux density, but also reduces the thermal emissions. This thermal management is further optimised by having the micro-reflectors plated directly to a specialist ceramic substrate and thus minimising the thermal path for each LED die.

Therefore using a combination of the above methods COOLLED is able to create a range of novel and innovative LED based light sources for a variety of applications. These applications are varied both in terms of light output and wavelength, but the COOLLED technology can by used for all applications. As well as processing LED die, COOLLED's engineers have also built up considerable knowledge and expertise in the design of light systems using both SMT LED packages and conventional through hole LED types in a variety of wavelengths. And as well as offering a design service for the light source, they are also able to take the design through all relevant safety compliance testing.