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1 December 1997 Stimulated emission from films of conjugated polymers and oligomers
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Oligomers and block copolymers structurally related to PPV were investigated under intense optical excitation. Their well-defined molecular structure allows a better control of emission properties than is usually feasible in semiconducting polymers. Stimulated emission is demonstrated in single crystals of PPV-type oligomers, and also in thin films obtained by spin casting of copolymers containing PPV- type blocks. Waveguiding is shown to provide the length of interaction required for mirrorless laser generation. Thin films of oligomers obtained through deposition from the vapor phase are polycrystalline, and the optical losses in the as-deposited films are too large for lasing to be achieved. These films show stimulated emission only after the domain size has been increased by annealing.Lasing occurs within individual crystalline domains with a threshold value comparable to that found for optically clear amorphous films of conjugated polymers.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul F. van Hutten, Hendrik-Jan Brouwer, Victor V. Krasnikov, T. A. Pham, Richard E. Gill, and Georges Hadziioannou "Stimulated emission from films of conjugated polymers and oligomers", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997);

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