We report on the photoluminescence (PL) properties of poly[2,7-(9-9-dioctylfluorene)] (PF) thin film under strong optical pumping using a streak camera system. When the excitation energy density increases above 72μJ·cm⁻² , the emission spectrum becomes narrower and PL decay curve comes to be faster simultaneously. These behaviors are clear evidence of Amplified Spontaneous Emission (ASE) due to a waveguided Stimulated Emission in slab structure of thin film. ASE threshold of 72μJ·cm⁻² is comparable with previous reports and PF is attractive as a gain medium for plastic lasers.
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Shin et al. (2015) studied this question.
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