Abstract
Abstract Microwave irradiation to energized electroluminescent cells made of a copolymer of p-phenylenevinylene (PPV) derivatives under a resonant magnetic field resulted in a decrease in emission intensity. This is due to a reduction of singlet radical ion pairs by forced spin conversion into the triplet manifold. This microwave effect became 1.6±0.1 and 2.3±0.1 times larger after the “turn-off,” the removal of the driving voltage of 8 and 10 V, respectively. Since the formation of radical ions terminates at turn-off, this increase cannot be attributed to the increase of radical ion pairs. The magnetic field effect on the emission intensity also increased from 1.09±0.01 to 1.12±0.03 after turn-off. These phenomena are ascribed to the decrease of the exchange interaction between radical ions in a pair by the removal of the electric field.
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