An ultrafast spectroscopy study of stimulated emission in poly(9,9-dioctylfluorene) films and microcavities

We report measurements of stimulated emission in poly(9,9-dioctylfluorene). We find a gain coefficient of 1.2×104 cm−1 for 100 nm-thick films at an excitation energy density of 9.9 mJ/cm2. Using ultrafast pump–probe measurements, we have studied the effect of cavity optical confinement. A strong shift of the cavity resonance due to nonlinear refraction is observed.

[1]  K. Yoshino,et al.  Cooperative and stimulated emission in poly(p-phenylene-vinylene) thin films and solutions , 1998 .

[2]  R. H. Friend,et al.  Lasing from conjugated-polymer microcavities , 1996, Nature.

[3]  G. Lanzani,et al.  EXCITED-STATE DYNAMICS OF POLY(PARA-PHENYLENE)-TYPE LADDER POLYMERS AT HIGH PHOTOEXCITATION DENSITY , 1998 .

[4]  Alfons Penzkofer,et al.  Laser action in poly (m-phenylenevinylene-co-2,5-dioctoxy-p-phenylenevinylene)† , 1996 .

[5]  R. N. Marks,et al.  Light-emitting diodes based on conjugated polymers , 1990, Nature.

[6]  Magnus Berggren,et al.  Organic solid-state lasers with imprinted gratings on plastic substrates , 1998 .

[7]  Norio Miyaura,et al.  Palladium-Catalyzed Cross-Coupling Reactions of Organoboron Compounds , 1995 .

[8]  Donal D. C. Bradley,et al.  Chain geometry, solution aggregation and enhanced dichroism in the liquidcrystalline conjugated polymer poly(9,9-dioctylfluorene) , 1998 .

[9]  Ullrich Scherf,et al.  Blue green stimulated emission from a high gain conjugated polymer , 1997 .

[10]  Akihiko Fujii,et al.  Cylindrical microlasers and light emitting devices from conducting polymers , 1998 .

[11]  Donal D. C. Bradley,et al.  Emission processes in conjugated polymer solutions and thin films , 1997 .

[12]  Mats Andersson,et al.  “Plastic” lasers: Comparison of gain narrowing with a soluble semiconducting polymer in waveguides and microcavities , 1997 .

[13]  Benjamin J. Schwartz,et al.  Ultrafast intensity-dependent stimulated emission in conjugated polymers: The mechanism for line-narrowing , 1998 .

[14]  Michael Inbasekaran,et al.  Influence of aggregation on the optical properties of a polyfluorene , 1997, Optics & Photonics.