Abstract
The electron emission of position-controlled grown ZnO nanoflowers was investigated forapplication in cold cathode electron emission devices. ZnO nanoflower arrays, composed ofseveral nanoneedles with sharp tips, were grown selectively on a conducting glass substrateusing a chemical solution deposition method. The morphology and position of the ZnOnanoflowers were controlled by preparing polymethylmethacrylate submicron patterns usingelectron-beam lithography. Without the patterns, in contrast, vertical ZnO nanoneedleswere randomly grown on the substrates with high density. Several samples preparedat the same conditions exhibited almost the same nanoflower morphology andfield emission characteristics. Comparison of the field emission characteristics ofthe ZnO nanoflower arrays and ZnO nanoneedles showed that the arrays hadexcellent electron emission characteristics, with a low turn-on electric field of0.13 V µm−1 at0.1 µA cm−2 and a high emissioncurrent density of 0.8 mA cm−2 in anapplied electric field of 9.0 V µm−1. Furthermore, light-emitting devices made using ZnO nanoflower arrays demonstratedstrong light emission, and micropixels for display application were clearly displayed.
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