  Light sources on the scale of single molecules can be addressed and
characterized on their proper sub-nanometer scale by scanning tunneling
microscopy induced luminescence (STML). Such a source can be driven by defined
short charge pulses while the luminescence is detected with sub-nanosecond
resolution. We introduce an approach to concurrently image the molecular
emitter, which is based on an individual defect, with its local environment
along with its luminescence dynamics at a resolution of a billion frames per
second. The observed dynamics can be assigned to the single electron capture
occurring in the low-nanosecond regime. While the emitter's location on the
surface remains fixed, the scanning of the tip modifies the energy landscape
for charge injection to the defect. The principle of measurement is extendable
to fundamental processes beyond charge transfer like exciton diffusion.
