Millisecond radiative recombination in poly(phenylene vinylene)-based light-emitting diodes from transient electroluminescence
- García Belmonte, Germà
- Montero, José M.
- Barea, Eva M.
- Bisquert, Juan
- Bolink, Henk
DOIAbstract
The current and electroluminescence transient responses of standard poly(phenylene vinylene)-based light-emitting devices have been investigated. The electroluminescence time response is longer (milliseconds scale) than the current switch-off time by more than one order of magnitude, in the case of small area devices (<0.1 cm2). For large area devices ( ∼ 6 cm2) the electroluminescence decay time decreases from 1.45 ms to ∼ 100 μs with increasing bias voltage. The fast current decay limits the electroluminescence decay at higher voltages. Several approaches are discussed to interpret the observed slow decrease of electroluminescence after turning off the bias. One relies upon the Langevin-type bimolecular recombination kinetics which is go...
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