UV Light‐Emitting Diodes: Enhancement of Heat Dissipation in Ultraviolet Light‐Emitting Diodes by a Vertically Oriented Graphene Nanowall Buffer Layer (Adv. Mater. 29/2019)

The use of vertically oriented graphene nanowalls as a buffer layer for the growth of high-quality AlN film on a sapphire substrate to improve heat dissipation is proposed by Tongbo Wei, Zhiqiang Liu, Peng Gao, Zhongfan Liu, and co-workers in article number 1901624. Thus, their as-fabricated light-emitting diode shows a 37% increasement of light output power under a high injection current (350 mA) due to the temperature reduction and strain relaxation.