Multicolor Graphene Nanoribbon/Semiconductor Nanowire Heterojunction   Light-Emitting Diodes
  We report novel graphene nanoribbon (GNR)/semiconductor nanowire (SNW) heterojunction light-emitting diodes (LEDs) for the first time. The GNR and SNW have a face-to-face contact structure, which has the merit of bigger active region. ZnO, CdS, and CdSe NWs were employed in our case. At forward biases, the GNR/SNW heterjunction LEDs could emit light with wavelengths varying from ultraviolet (380 nm) to green (513 nm) to red (705 nm), which were determined by the band-gaps of the involved SNWs. The mechanism of light emitting for the GNR/SNW heterojunction LED was discussed. Our approach can easily be extended to other semiconductor nano-materials. Moreover, our achievement opens the door to next-generation display technologies, including portable, "see-through", and conformable products. 
Yu Ye, Lin Gan, Lun Dai, Hu Meng, Feng Wei, Yu Dai, Zujin Shi, Bin Yu,   Xuefeng Guo, and Guogang Qin
cond-mat.mes-hall cond-mat.mtrl-sci