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We demonstrate optically pumped lasing in submicron thick films, neat and undiluted, of photoluminescent conjugated polymers. Lasing is evidenced by a dramatic collapse of the emission line width (to as little as 7 nm) at very low pump energy thresholds (~10 μJ/cm 2 ). Laser action is found in over a dozen different conjugated polymers representing a variety of molecular structures, including...
Ultrafast transient absorption, stimulated emission (SE), and photoluminescence (PL) measurements were performed on solid films of the conducting polymer: poly[2-butyl-5-(2′-ethyl-hexyl)-1,4-phenylenevinylene](BuEH-PPV). The ground state absorption and luminescence of BuEH-PPV are similar to those of unsubstituted PPV, indicating that alkyl substitution does not significantly alter the electronic...
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