Abstract
After an external laser pulse/beam is used to pump a conjugated polymer, such as poly(phenylene vinylene) (PPV), the continuous optical pumping reverses the electron populations in a polymer light-emitting diode, leading to amplified spontaneous emission (ASE). This is accompanied by localized lattice distortion along the polymer chain due to the excitation of a singlet exciton. With the application of an electric field along the polymer, the inversion of electron population is weakened. Once the strength of the applied electric field exceeds a certain threshold, it leads to the aberrance of the localization contributed by the excitation of exciton, which not only forbids the electron transition, but quenches the ASE.
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