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A hot-exciton is usually the initial elementary excitation product of thesolid phase, particularly in low dimensional photonic materials, which is abottle-neck to all subsequent processes. Measurement of hot-exciton emission(HExEm) is a great challenge due to fast EK relaxation and thus very weaktransient emission. Here we report the first unambiguous observation offemtosecond HExEm from thin films of a model quasi-one-dimensional{\pi}-conjugated organic rigid-rod quantum nanowire, MeLPPP (methyl-substitutedladder-type poly(para-phenylenes), by using femtosecond time-resolvedfluorescence spectroscopy. The results show the clear HExEm from the coolinghot-excitons has a lifetime of ~500 to ~800 fs, and concomitant very weakdensity-dependent singlet-singlet annihilation (SSA) due to this ultrashortdwelling time.

Femtosecond Hot-Exciton Emission in a Ladder-Type pi-Conjugated Rigid-Polymer Nanowire