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The stimulated emission properties associated with high optical gain is investigated in pure methyl-substituted poly-(paraphenylene) laddertype polymer (m-LPPP). Amplified spontaneous emission (ASE) in combination with waveguiding in the polymer film results in a highly directional linear polarised blue output at low pumping threshold of 3kW/cm 2 . Above a threshold value of 400 kW/cm ...
We applied femtosecond pump-probe spectroscopy to a guest-host system of conjugated polymers, the blue-emitting poly(paraphenylene) (m-LPPP) and the red-emitting poly(perylene-co-diethynylbenzene) (PPDB). Excitation energy transfer between m-LPPP and PPDB, monitored by the formation of the PPDB photobleaching band at 2.15 eV, takes place on a picosecond time scale. The nonexponential kinetics of the...
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