School of Science, University of Jinan, Jinan 250022, China
Abstract:
This paper utilizes the brightness-voltage waveform curve
to investigate the primary electron in solid state
cathodoluminescence. The results indicate that the primary electron
is from the interface state of SiO2/MEH-PPV
(Poly2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]) under
the lower electric field which contributes to the 580-nm emission.
With increasing the electric field, the 405-nm emission is obtained,
and under this condition, the origin of the primary electron is mainly
from tunneling.