Effect of pressure on photoluminescence and optical absorption in meh-ppv

We have studied the photoluminescence (PL) and optical absorption in MEH-PPV as a function of pressure up to 50 kbar. The PL and optical absorption bands redshift with pressure and the PL efficiency decreases dramatically. These features are similar to results reported earlier for pressure effects in unsubstituted PPV. However the initial pressure redshift in MEH-PPV is about twice as large as that in unsubstituted PPV, and the PL decays faster. The vibronic structure in the PL is maintained up to the highest pressures,