Optical phonon scattering of cavity polaritons in an electroluminescent   device
  A signature of the scattering between microcavity polaritons and longitudinal optical phonons has been observed in the electroluminescence spectrum of an intersubband device operating in the light-matter strong coupling regime. By electrical pumping we resonantly populate the upper polariton branch at different energies as a function of the applied bias. The electroluminescent signal arising from these states is seconded by a phonon replica from the lower branch. 
A. Delteil, A. Vasanelli, P. Jouy, D. Barate, J. C. Moreno, R.   Teissier, A. N. Baranov, and C. Sirtori
cond-mat.mes-hall