CNT‐Based FEL for BLU in LCD

A vacuum-sealed compact x-ray tube based on focused carbon nanotube field-emission electrons

“…Figure 2 shows the measurement setup of the vacuumsealed compact x-ray tube and cathode current (I c ) versus gate voltage (V g ) curves of the x-ray tube for various anode voltages (V a ) in the course of electrical aging. The x-ray tube has been tested under active-current control using a voltage-controlled current source like a high-voltage MOSFET [22,28]. The active-current control can be easily applied to triode field emitters, improving the stability and reliability of the vacuum-sealed x-ray tube.…”

“…Furthermore, residues acting as a strong degradation species, such as O 2 and H 2 O, for field emission [31,33,34] could be effectively eliminated by the brazing process at elevated temperature, giving a very stable emission for prolonged operation at a high current. In addition, the stability and reliability of the vacuum-sealed x-ray tube can be further improved by the active-current control method [22,28]. The active-CCU can allow the gate voltage margin to be extended to over 500 V at a given gate voltage, which strongly compensates the current degradation.…”

“…Terpineol was used as a solvent and the CNT paste was formulated by using only ball-milling apparatus. With the help of the inorganic fillers we could improve both the adhesion of the CNT emitter to the cathode electrode and the high-temperature durability needed for the brazing process [22][23][24][25]. After printing the CNT paste on the Kovar cathode substrate in plural dots, we carried out a firing process of the organic binder at 350 • C in air.…”