Improved heat dissipation in gallium nitride light-emitting diodes with embedded graphene oxide pattern

Nam Han, Tran Viet Cuong, Min Han, Beo Deul Ryu, S. Chandramohan, Jong Bae Park, Ji Hye Kang, Young-Jae Park, Kang Bok Ko, Hee Yun Kim, Hyun Kyu Kim, Jae Hyoung Ryu (+3 others)
2013 Nature Communications  
The future of solid-state lighting relies on how the performance parameters will be improved further for developing high-brightness light-emitting diodes. Eventually, heat removal is becoming a crucial issue because the requirement of high brightness necessitates highoperating current densities that would trigger more joule heating. Here we demonstrate that the embedded graphene oxide in a gallium nitride light-emitting diode alleviates the selfheating issues by virtue of its heat-spreading
more » ... ity and reducing the thermal boundary resistance. The fabrication process involves the generation of scalable graphene oxide microscale patterns on a sapphire substrate, followed by its thermal reduction and epitaxial lateral overgrowth of gallium nitride in a metal-organic chemical vapour deposition system under one-step process. The device with embedded graphene oxide outperforms its conventional counterpart by emitting bright light with relatively low-junction temperature and thermal resistance. This facile strategy may enable integration of large-scale graphene into practical devices for effective heat removal.
doi:10.1038/ncomms2448 pmid:23385596 fatcat:zmszbxcaqjejlayiosnlotll5a