Photoluminescence from a soluble semiconducting polymer in waveguide and microcavity configurations

The optical properties of thin films of PVK-Alq3 are examined by means of spectrophotometry in the UV–VIS–NIR. Photoluminescence PL.measurements indicate that the polymer films deposited on glass substrates behave as asymmetrical planar waveguides for the emitted light. The waveguided luminescence shrinks and change color with respect to the non-waveguided emission. Stronger changes in the luminescence features are observed using a microcavity configuration, obtained by spin-coating PVK-Alq3 on an inorganic Distributed Bragg Reflector DBR.and by vacuum-depositing a thick aluminum layer on the top of the polymer film. q1999 Published by Elsevier Science B.V. All rights reserved