Cathodoluminescence in Y_2O_3:Eu Thin Films

摘要

Earlier work on the cathodoluminescence of thin films, excited in the range of 0 to 1.5kV, has shown that the luminance B could be approximately described by the expression: B approx= K i V~m x~n (1) Here V is the excitation beam potential, i is the beam current and x the film thickness, K is a material constant and the exponents m and n, also material sensitive, are of the order of 1.5 and 0.5 respectively. These trends are well illustrated in figures 1 and 2, which show luminance as a function of voltage at constant current and luminance as a function of current at constant voltage, both for a range of film thicknesses. Whilst it is easy to understand the implied relation between beam current and luminance, the thickness and beam voltage result are more difficult to reconcile.