Huge exchange energy and fine structure of excitons in an organic-inorganic quantum well material

  • Ema K
  • Umeda K
  • Toda M
 et al. 
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Abstract

Photoluminescence and spin-flip Raman scattering of excitons in an
organic-inorganic quantum well material (C4H9NH3)(2)PbBr4 have been
investigated at low temperature. The estimated exchange energy of
the exciton is greatly enhanced by strong confinement and by image
charge effects, and ranges from 28 to 32 meV. These values are one
or two orders of magnitude larger than those for quantum wells made
from the more usual inorganic materials. The ratio of the oscillator
strength of the dipole-allowed exciton to that of the dark (dipole-forbidden)
exciton is estimated to be of order 800.

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