A small fraction of narrow‐bandgap benzothiadiazole (BT) ‘defects’ covalently integrated into the main chain of a wide‐bandgap polyfluorene (PF) polymer minimizes self‐absorption effects via efficient energy transfer from absorbing PF segments to emitting BT ‘defects’. A threshold for amplified spontaneous emission in a glass/polymer/air optical waveguide as low as 15 kW cm –2 is achieved.
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Vehse et al. (2004) studied this question.
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