Fig. 2: Device structure, experimental set-up, and external-electric-field-modulated luminescence.
From: Slow recombination of spontaneously dissociated organic fluorophore excitons
a Energy-level diagram of materials used in this work (left) and schematic of the experimental set-up for external-electric-field-modulated luminescence measurements (right). ITO and Al electrode were used as anode and cathode, respectively. b External-electric-field-modulated TRPL profile in a device with a 50-wt%-TPA-DCPP:CBP blend (red line). The blue line is the TRPL profile of a 50-wt%-TPA-DCPP:CBP blend (without electrodes or T2T and CBP layers) for comparison. The black and green line indicates the IRF in this measurement system and the time profile of the external applied voltage, respectively. The excitation light pulse width was set to 500 µs. c Dependence of the external-electric-field-modulated TRPL profiles on external-voltage-pulse delay in the 50 wt%-TPA-DCPP:CBP device. The applied voltage and the width were fixed to 5 V and 50 µs, respectively. Note that it is not a multiple voltage pulses. This experiment used independent voltage pulses for each timing, and multiple measurements were performed.
