High efficiency surface-conducted field emission from a ZnO nanotetrapod and MgO nanoparticle composite emitter

Display R&D Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People’s Republic of China
Applied Physics Letters (Impact Factor: 3.3). 01/2009; 93(25):253501 - 253501-3. DOI: 10.1063/1.3046785
Source: IEEE Xplore


We report a surface-conducted field emitter made of a ZnO nanotetrapod and MgO nanoparticle composites with a high emission efficiency (∼100%) and current (3.77 mA at a gate voltage of 100 V and anode voltage of 1800 V). The fabrications of the triode structure with a 10×10 pixel array and corresponding driving method have been proposed. The electron trajectories are simulated according to the structure. Individual pixel addressing can be achieved by a sequential scanning mode. Display of moving images employing this triode structure was demonstrated. The results are of significance to the development of ZnO based triode field emitters.

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    ABSTRACT: In this letter, we report a new kind of hybrid field emitters with a mixture of ZnO nano-tetrapods and MgO particles by a spin-coating method. Due to the excellent field-emission properties of hybrid field emitters, the turn-on electric field (at a current density of 1 ??A/cm<sup>2</sup>) and the threshold electric field (at a current density of 1 mA/cm<sup>2</sup>) have been reduced to 0.6 and 0.92 V/??m, respectively. The turn-on and the threshold electric fields have been decreased by about 67% and 74% compared with the data reported previously. With these hybrid field emitters, a cathodoluminescent lamp is investigated. As the experimental results show, the operation voltage of the cathodoluminescent lamp is low, and the ratio between the anode and the cathode currents is quite high. Apart from this, the brightness uniformity of the lamp is also improved.
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