Seedless synthesis of layered ZnO nanowall networks on Al substrate for white light electroluminescence

In this paper, layered ZnO nanowall networks were directly grown on Al substrates using a hydrothermal method without predepositing seed layers. The individual ZnO nanowalls with a thickness of several nanometers and a size of several hundred nanometers were (002) surface dominated, in which the preferential growth direction of ZnO was suppressed. White electroluminescence devices were fabricated based on Au/polymethylmethacrylate/ZnO-nanowall (metal–insulator–semiconductor) structures. The chromaticity coordinate of the electroluminescence spectrum for the optimal device was calculated as (0.27, 0.34), which is close to (0.33, 0.33) of standard white light.

Huihui Huang, Haoning Wang, Borui Li, Xiaoming Mo, Hao Long, Yuan Li, Han Zhang, David L Carroll and Guojia Fang

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