KAIST stamps vertical microLEDs onto flexible substrates: Page 2 of 2

January 31, 2018 // By Julien Happich
Researchers from the Korea Advanced Institute of Science & Technology (KAIST) have developed a novel anisotropic conductive film (ACF)-based transfer and interconnection technology to transfer an array of vertically-grown inorganic LEDs to a densely connected flexible substrate, yielding what they call flexible vertical micro LEDs of f-VLEDs.

With the help of Professor Daesoo Kim from the Department of Biological Sciences, the new f-VLEDs were then applied to optogenetics, whereby light pulses are used to stimulate neurons within localized cortical areas of the brain. In a paper titled “Optogenetic Control of Body Movements via Flexible Vertical Light-Emitting Diodes on Brain Surface ” published in the February 2018 issue of Nano Energy, the researchers describe how they inserted the flexible VLEDs between the skull and the brain surface of a mouse to control her behaviour, illuminating motor neurons on two-dimensional cortical areas located deep below the brain surface.

Brain science aside, other biomedical applications envisaged by the researchers include phototherapeutic treatment and contact lens biosensors.

Back in 2016, Professor Lee has spun-off a startup called FRONICS (abbreviated from Flexible electRONICS) to commercialize its transfer technologies to companies willing to design their own IoT products, based on flexible micro LED technology. According to the company's website, the anisotropic conductive film-based transfer and interconnection technology is applicable to both GaN and GaAs LEDs and can support resolutions from 400 to 1300ppi.

KAIST - www.kaist.edu

FRONICS - www.fronics.com

Related articles:

Implantable wireless microLED devices shown to block pain signals

Toward OLED-controlled live neural networks

OLEDs too costly, micro-LEDs to steal the show promises Canadian startup