The kinetics and efficiency of cathodoluminescence

摘要: The various stages in excitation of luminescence by cathode rays are examined with the object assessing possible efficiency energy conversion. It is shown that reflection primary electrons constitutes a major loss energy. elastic scattering process responsible dependent on coulomb interaction between and atoms solid. Energy losses inside phosphor due to ionization follow fairly simple relation residual electron At all but low energies yields modified Thomson-Whiddington range law. After cascade production secondary relatively uniform volume results, bounded most cases surface where occurs as emission. Secondary incapable further will undergo phonon process. thermal velocities they be available for radiative recombination. Approximate theoretical conversion efficiencies should region 25%. An experimental estimate ZnS-Ag phosphors gives 23% which close agreement. relations, found experimentally microcrystalline layers, luminescence, beam current density can only qualitatively related detailed processes excitation. However, more accurate interpretations data obtained use single crystals.