Drooping as a simple characterization tool for extraction efficiency and optical losses in light emitting diodes

摘要

We extend the previous droop models developed for InGaN light emitting diodes u0002LEDsu0003 bynaccounting for the light extraction and show that drooping can be used to quantify both thenextraction efficiency and the optical losses in LEDs. Our model allows very simple characterizationnof LEDs by an integrating sphere and therefore provides an attractive characterization tool tonmeasure the most important loss parameters of various LED structures. In particular, the approachnallows evaluation of the effects of various optical losses and photon recycling on the efficiency andnconsequently allows more efficient optimization of the LED structures. As an additional benefit, ournmeasurement method does not necessarily require any fitting of the data.