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We present results of cw, time-resolved, and spatially resolved spectroscopic studies of emission and absorption in a model conjugated polymer, poly( p-pyridyl vinylene͒ ͑PPyV͒. The redshifted film spectra suggest the formation of aggregated regions. The ϳ4ϫ reduction in emission efficiency in films vs solution is attributed to a longer radiative lifetime for aggregate excitons, as is evidenced by time-resolved fluorescence measurements. We present direct optical imaging of aggregates in a conjugated polymer via near-field scanning optical microscopy. The aggregate emission and absorption are found to be localized to partially aligned regions of the film ϳ200 nm in size. ͓S0163-1829͑96͒51530-4͔

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Blue light emitting diode internal and injection efficiency AIP Advances 2, 032117 (2012) Enhancement of hole injection and electroluminescence characteristics by a rubbing-induced lying orientation of alpha-sexithiophene J. Appl. Phys. 112, 024503 (2012) Study of field driven electroluminescence in colloidal quantum dot solids J. Appl. Phys. 111, 113701 (2012) Indium incorporation and emission properties of nonpolar and semipolar InGaN quantum wells

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