Preparation of tetrapod-shaped ZnO nanomaterial field emission cathodes by deposition method

Tetrapod-shaped ZnO nanomaterial field emission cathode was preparated by deposition method. To the high-vacuum flat capsulation with phosphor screen and cathode was applied a voltage to test the cathode emission current and the phosphor screen brightness. For the cathode with total area 13 x 15 cm(2), the test results showed that when the volume percentage of K2SiO3 ranged from 5.0 x 10(-3) to 8.3 x 10(-3), concentration of Ba (NO3)(2) arranged from 5.0 x 10(-4) to 7.7 x 10(-4) M, and concentration of tetrapod-shaped ZnO arranged from 8.2 x 10(-4) to 1.2 x 10(-3) M, the cathode emission current was the largest, and phosphor screen at peak brightness could reach 60 cd/cm(2). The average brightness was 48 cd/cm(2).