Processing method of field emitting cathode

Abstract

The invention provides a processing method of a field emitting cathode. The processing method of the field emitting cathode comprises the following steps of: preparing an MWCNT (Multi Walled Carbon Nano-Tube) by using a chemical vapor deposition method; ultrasonically diffusing purified MWCNT powder in absolute ethyl alcohol, naturally drying at a room temperature and sufficiently grinding, and mixing with an organic carrier and using as cathode slurry after stirring for 1-2 hours; printing a layer of silver slurry thin film electrode with an area of 60 mm*25 mm on a glass substrate; printing a carbon tube thin film at the center of the substrate by the prepared carbon tube slurry through a 200-mesh silk screen after sintering; putting all samples in a tube type furnace together, and sintering at the presence of Ar; and carrying out laser ablation treatment for 5 minutes in air by using an excimer laser system. Therefore, the switch-on field intensity is reduced, and the emitting current is increased.

Description

technical field [0001] The invention belongs to the field of FED, in particular to a method for modifying the surface of a screen-printed multi-walled carbon nanotube (MWCNTs) film. Background technique [0002] The main difficulties faced by FED display devices, in addition to problems such as vacuum packaging, all come from the cathode manufacturing process. The difficulties of controlling the uniformity and stability of field emission and reducing the cost of the driving circuit are directly restricted by the material and structure of the FED cathode. Spindt-type devices require the fabrication of hundreds or thousands of cathode arrays of "sharp cones and round holes" within a pixel size range. This makes the photolithography process and thin film preparation very complicated, and the production cost is also very expensive. Difficulties in the manufacturing process of the cathode also lead to poor uniformity of the shape of the cone array and unsatisfactory overall sta...

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Problems solved by technology

However, the produced CNTs are entangled with each other, the surface is surrounded by pulping materials, and the tips are not protruding. The residual organic matter after sintering still seriously affects the field emission performance of the CNTs film.

In order to solve these problems, people have tried methods such as plasma bombardment, ion beam irradiation, tape sticking], mechanical friction and soft rubber roller rolling to process the screen-printed FED cathode, but because the film is damaged, or it is not easy to accurately control The improvement of field emission performance is also limited due to problems such as processing process and effect

[0004] The method of preparing carbon tube thin film FED cathode by screen printing method (or coating method) has good practical application prospects, but the field emission performance is not satisfactory (mainly in terms of turn-on voltage, emission current and emission stability, etc.)

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