Ultrafast Forster transfer in a highly fluorescent polymer blend

Summary form only. Blue fluorescent polymers are considered promising materials for light emitting devices: they can be used in pure phase as competitors of inorganic blue LEDs and lasers, or adopted as energy donors for color conversion in organic structures. This process can be realized by Forster energy transfer in polymer blends, thus providing a simple way to build tunable emission devices. In this work we investigate in time domain the ultrafast Forster energy transfer in blends of poly(9,9-dioctylfluorene) (PFO) doped with tetraphenylporphirin (TPP), as a function of doping concentration. Pump-probe measurements were performed using 180-fs pump pulses.