CATALYST USED TO FORM CARBON FIBER, METHOD OF MAKING THE SAME AND ELECTRON EMITTING DEVICE, ELECTRON SOURCE, IMAGE FORMING APPARATUS, SECONDARY BATTERY AND BODY FOR STORING HYDROGEN

摘要

PURPOSE: An electron emitting device is provided to achieve advantages of low electric field needed for electron emitting, low vacuum level needed for driving and high emitted electron density. CONSTITUTION: An electron emitting device includes a film containing a plurality of carbon fibers. The film, according to Raman spectrum characteristic detected by irradiating laser having a wavelength of 514.5nm, has the first peak of intensity of Raman scattering in which Raman shift is in a range of 1355±10kaiser(cm¬-1) and the second peak of intensity of Raman scattering light in which Raman shift is in a range of 1580±10kaiser. A Full-Width Half-Maximum(FWHM2) of the first peak and a Full-Width Half-Maximum(FWHM1) of the second peak satisfy a relation that FWHM2/FWHM1 <= 1.2.