ATTEMPT AT THE THIRD GENERATION ELECTROLUMINESCENCE (EL)

A preliminary trial of enhancing the brightness or lowering the driving voltage of an electroluminescent cell is given. Based on the experimental facts that the most important and inevitable process in EL is the impact excitation or ionization, we attempt at enlarging the brightness by widening the impact excitation cross-section which is calculated and is found to be dependent on the energy distribution of impinging electrons¹).

Further we take into account the structure of conduction band and deduce a formula which shows the anisotrom of the impact cross-section²). Numerical calculations are performed and the results will be checked by experiments.

In order to overcome the loss in initial acceleration phase we preheat carriers and inject them into the high field acceleration zone, in which the production of streaming carriers is expected³). By this way we vary the energy distribution toward higher energy and really we observe the enhancement of brightness in several folds.