Effect of Current on the Inhomogeneous Light Emission From AlGaInP-Based Flip-Chip Red Mini-LEDs

The distributions of the electroluminescence of AlGaInP-based flip-chip red light-emitting diodes with a size of
$100\,\,\mu \text{m}\,\,\times 200\,\,\mu \text{m}$
have been obtained via microscopic hyperspectral imaging by capturing spatially resolved light emission from the side of a transparent substrate. As the injected DC current exceeds the current corresponding to the maximum external quantum efficiency, the light emission from the current crowding region decreases due to the self-heating effect, whereas the emission of the region corresponding to the anode becomes dominant due to the low heat resistance.