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A hyperlinear increase of radiative quantum efficiencies of poly(para-phenylene)-type ladderpolymer in the blue–green region as a function of subpicosecond excitation intensity is reported. The light emission in the range from 485 to 495 nm undergoes a change from linear behavior to a second order response; the two regimes are separated by a distinct threshold of 3.1 mJ/cm2. Above this threshold, investigation by femtosecond excitation–correlation measurements indicate that the hyperlinear blue emission is associated with a characteristic excitonic depopulation of 2 ps.
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Kranzelbinder et al. (1997) studied this question.
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