Abstract
To mitigate the “green gap” effect in green light-emitting diodes (LEDs), we investigate a pulsed mode operation, where carrier injection and carrier recombination happen at different bias. Carriers are injected into the quantum wells during forward bias, and recombine during reverse bias when the overlap of electron and hole wave functions is maximized. For this, we investigate the spectral-temporal properties of commercial green LEDs during pulsed operation with varying forward current from 2,5 up to 70 mA and reverse bias from 0 to −3 V. At the falling edge of the electrical signal an increase of the intensity and blue-shift of the emission could be demonstrated, indicating the dynamic reduction of the quantum-confined stark effect. However, droop curves measured in pulsed mode did not show an absolute improvement in efficiency, compared to cw droop curves. We conclude that green LEDs have to be optimized for this mode of operation to show an absolute increase in efficiency in pulsed mode.
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