Probing recombination-rate distribution in organic light-emitting devices with mixed-emitter structure

From intensity of red/green ratio versus probe position at 2.5 mA/cm2, position of exciton accumulation is determined to be at 10 nm at which peak intensity ratio is. As deduced from the electrical current at 8 V versus probe position, the benefit of current increase results from the higher recombination coefficient of the probe.