Applied Physics Letters
Nanowires, Light emitting diodes, Particles (Nuclear physics)
We report room-temperature, white-color electroluminescence in vertically oriented ZnO nanowires. Excitonic luminescence around 380 nm is observed as a shoulder on a broader defect-related band covering all of the visible range and centered at 620 nm. The ZnO nanowires are grown in a low-temperature process on SnO2-coated glass substrates, employing a technique that is suitable for large-area applications. The nanowires are robustly encapsulated in a thin polystyrene film deposited from high-molecular-weight solutions. Electron injection occurs through the transparent SnO2 layer, while hole injection is mediated by a p-doped polymer and an evaporated Au contact. Stable device operation is observed at ambient conditions on the time scale of 1 h.
Könenkamp, R. R., Word, R. C., & Schlegel, C. C. (2004). Vertical nanowire light-emitting diode. Applied Physics Letters, 85(24), 6004-6006.