Abstract
Measurements of persistent intemal polarization (P. I. P.) were performed with anthracene powders dispersed in a dielectric resin.
Appreciable P. I. P. was observed under Illumination either with near ultraviolet light or even with λ>5200Å far above the absorption edge (4000Å) of anthracene.
It was found that the growth of P. I. P. in commercial materials depended exponentially on polarizing time according to the relation:
[Equation]where
P is polarization,
Pconst. is polarization after a long polarizing time, τ is a time constant,
t is a polarizing time.
On the other hand, P. I. P. of purer anthracene did not obey the above relation under illumination with λ< 5200Å.
It appeared that the distribution of charge carriers in anthracene was affected by the injection of charge carriers from the illuminated electrode.
Sensitization of P. I. P. due to some dyes was also investigated.
