Magnetic Field Effect as a Test for Effectiveness of the Light Emission at the Recombination of Injected Charge Carriers in Polymeric Semiconductors

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Abstract
The electroluminescence (EL) of poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene] (MEH-PPV) under DC magnetic field has been investigated experimentally and analyzed theoretically. We have estimated the lifetime of intermediate polaron pairs and relation between rate constants of recombination of triplet and singlet polaron pairs from the changes of the EL intensity caused by the DC magnetic field. The short lifetime of the polaron pairs (about 2 × 10−10s) in MEH-PPV has been discussed by taking the intersystem crossing in polaron pairs into consideration.