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Based upon the recognition that bimolecular charge recombination in random organic systems is in accord with the Langevin formalism, a simple model has been developed to treat the recombination of charge carriers in light-emitting diodes (LEDs). A more elaborate analytic theory will be presented that is able to account for the recombination of majority and minority carriers in bilayer LEDs in which...
The transient behavior of the electroluminescence (EL) from single- and double-layer light-emitting diodes (LEDs) has been measured upon application of a pulse voltage. The active materials were tri(methoxystilbene)amine (MSA) and an oxadiazole (PBD) dispersed in polysulfone (PSu) and polystyrene (PS), respectively. In double-layer devices onset of EL occurs after a delay time t d that reflects...
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