LETTER pubs.acs.org/JPCL
Time- and Polarization-Resolved Photoluminescence of Individual Semicrystalline Polythiophene (P3HT) Nanoparticles Joelle A. Labastide,† Mina Baghgar,‡ Irene Dujovne,† B. Harihara Venkatraman,† David C. Ramsdell,†,§ Dhandapani Venkataraman,*,† and Michael D. Barnes*,†,‡ †
Department of Chemistry and ‡Department of Physics, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
bS Supporting Information ABSTRACT: We report on a remarkable size and internal structure dependence on timeand polarization-resolved photoluminescence (PL) from individual regioregular rrP3HT (poly-3-(hexylthiophine)) nanoparticles. For the smallest particles (∼34 nm) with relatively low crystallinity (40%), the time evolution of polarization contrast is nearly stationary; for intermediate-sized particles (∼ 65 nm), depolarization occurs on a 1 2 ns time scale. The largest and most crystalline particles studied (118 nm, 70%) show a PL depolarization on a time scale of
