Abstract: Provided are carbide derived carbon prepared by thermochemically reacting carbide compounds and a halogen element containing gas and extracting all atoms of the carbide compounds except carbon atoms, wherein the intensity ratios of the graphite G band at 1590 cm?1 to the disordered-induced D band at 1350 cm?1 are in the range of 0.3 through 5 when the carbide derived carbon is analyzed using Raman peak analysis, wherein the BET surface area of the carbide derived carbon is 1000 m2/g or more, wherein a weak peak or wide single peak of the graphite (002) surface is seen at 2?=25° when the carbide derived carbon is analyzed using X-ray diffractometry, and wherein the electron diffraction pattern of the carbide derived carbon is the halo pattern typical of amorphous carbon when the carbide derived carbon is analyzed using electron microscopy. The emitter has good uniformity and a long lifetime. An emitter can be prepared using a more inexpensive method than that used to manufacture conventional carbon nanotubes.