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Advances in wireless bonding LED technology

Posted: 24 Oct 2012 ?? ?Print Version ?Bookmark and Share

Keywords:Wireless bonded LED? flip chip? delta chip?

With wireless bonded LEDs however, the LED is bonded with a silver epoxy and cured to the die. The die itself is then attached to PCB pads. This approach leads to much more durable performance as it requires 25 to 30g of force to sever the connection.

This makes wireless bonded LEDs over three times more vibration and shock resistant than traditional LEDs.

Superior Light Performance: Finally, wireless bonded LEDs provide superior light performance when compared with traditional LED technology. Higher light output is achieved in a more compact space and the light performance is unencumbered by shadows or other obstacles to consistent performance.

The larger die used in wireless bonded LEDs provides higher light output C up to 8% to 10% brighter in intensity. At the same time, real estate savings are possible as high intensity light can be achieved using a single wireless bonded LED rather than a larger array of traditional LEDs.

For example, to achieve the same 9W level of brightness, it would be possible to use a single module wireless bonded LED with a footprint of 41.5mm instead of an array of traditional LEDs with a footprint of over 65mm.

In addition to providing greater brightness in reduced space, wireless bonded LEDs provide more consistent, evenly distributed light performance. Traditional LED chips emit light from the side of the LED. That light is then bounced through a reflector over the wire bond which generates a shadow and can cause unevenness with light distribution. With a wireless bonded LED the chip can directly emit light from the top and the side with no wire bond casting shadows or creating uneven light distribution.

Figure 3: Light emission with traditionally bonded LED.

In the future
The applications that will benefit the most from wireless bonded LED technology are ones that specifically require superior heat dissipation, enhanced durability and superior light performance.

These applications include:

???High-power or high-brightness applications such as general lighting, white goods, and automotive that require superior heat dissipation.
???Performance-sensitive applications such as plastic sorting, security applications, precision medical applications and agricultural process that require enhanced durability and consistent performance.
???Visually sensitive applications such as grain sorting, industrial measurements and small space lighting that require bright, evenly distributed, shadowless light.

Figure 4: In addition to providing greater brightness in reduced space, wireless bonded LEDs provide more consistent, evenly distributed light performance.

As LED technology, particularly high-power LED technology, continues to evolve and become more widely adopted, wireless bonded LED technology provides key benefits to design engineers challenged with providing greater brightness, superior heat dissipation and enhanced durability with increasingly smaller footprints.

About the author
Jonathan Domingo is Product Development Engineer at Lumex. During his seven years of field work in optoelectronics, he has helped design custom LED and LCD solutions for leading brands in industries ranging from appliances to aviation to consumer electronics.

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