Inorganic-based micro light-emitting diodes (μLEDs) have been considered to substitute the conventional displays, because of their outstanding properties. The μLED applications are widely extending to various fields, such as augmented reality (AR), smart and biomedical devices. Furthermore, flexible μLEDs have been extensively investigated by several researchers for user-friendly optoelectronics. However, the μLEDs stability in harsh environments were not significantly investigated yet. Here, we realized wearable μLEDs using simple and rapid μLED fabrication process. Flexible μLEDs have excellent mechanical, thermal, humid, and photo stability in various environmental conditions. Finally, wearable μLED array was achieved on a general cloth.
The high performance GaN light emitting diode (LED) from sapphire wafer has been transferred on a plastic substrate
with 308nm XeCl laser lift-off (LLO) for next generation flexible lighting applications. SU-8 passivation with
thermal release tape (TRT) adhesive enables structure coverage and adhesion so that it can be an excellent candidate for
a carrier substrate for non-wetting transfer process using laser liftoff technology. The dimensions of the laser beam are
also investigated in two types (3μm x 5cm and 1.2mm x 1.2mm) to reduce stress when decomposition of GaN occurs.
With careful optimization of carrier substrate and laser beam conditions, we can fabricate flexible GaN LED on
polyimide substrates which shows similar electrical properties to the GaN LED on bulk sapphire substrate.
The flexible GaN-based light emitting diode (LED) has been fabricated on a plastic substrate for flexible display
applications. The epitaxial structures of the GaN LED arrays are transferred onto a flexible substrate using standard soft
lithography technology and connected to a source-meter by metal lines. To verify the mechanically and optically stable
characteristics of the GaN LEDs on the flexible substrates, the electrical properties are characterized during 2000
bending cycles at various bending radius. A white light-emitting phosphor-coated GaN LED shows its potential as a
next-generation flexible light source.
Conference Committee Involvement (6)
Biosensing and Nanomedicine IX
28 August 2016 | San Diego, California, United States
Biosensing and Nanomedicine VIII
9 August 2015 | San Diego, California, United States
Biosensing and Nanomedicine VII
17 August 2014 | San Diego, California, United States
Biosensing and Nanomedicine III
25 August 2013 | San Diego, California, United States
IMID (Internation Meeting of Information Display
28 August 2012 |
Biosensing and Nanomedicine II
12 August 2012 | San Diego, California, United States